/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_palindrome_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 14:11:03,781 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 14:11:03,783 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 14:11:03,810 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 14:11:03,810 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 14:11:03,812 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 14:11:03,816 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 14:11:03,818 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 14:11:03,819 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 14:11:03,822 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 14:11:03,823 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 14:11:03,823 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 14:11:03,823 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 14:11:03,824 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 14:11:03,824 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 14:11:03,825 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 14:11:03,825 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 14:11:03,826 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 14:11:03,827 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 14:11:03,827 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 14:11:03,828 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 14:11:03,830 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 14:11:03,832 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 14:11:03,833 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 14:11:03,842 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-04-02 14:11:03,844 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 14:11:03,845 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 14:11:03,846 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 14:11:03,847 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 14:11:03,847 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 14:11:03,847 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 14:11:03,848 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 14:11:03,848 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 14:11:03,848 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 14:11:03,848 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 14:11:03,849 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 14:11:03,850 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 14:11:03,873 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 14:11:03,873 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 14:11:03,873 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 14:11:03,873 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 14:11:03,874 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 14:11:03,874 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 14:11:03,874 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 14:11:03,874 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 14:11:03,874 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 14:11:03,875 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 14:11:03,875 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 14:11:03,875 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 14:11:03,875 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 14:11:03,875 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 14:11:03,875 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 14:11:03,876 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 14:11:03,876 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 14:11:03,876 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 14:11:03,876 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 14:11:03,876 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 14:11:03,876 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 14:11:03,876 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 14:11:03,877 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 14:11:03,877 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 14:11:03,877 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 14:11:03,877 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 14:11:03,877 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 14:11:03,877 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 14:11:03,877 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 14:11:03,878 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 14:11:03,878 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 14:11:03,878 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 14:11:03,878 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 14:11:03,878 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 14:11:03,878 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 14:11:03,878 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 14:11:03,878 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 14:11:03,878 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 14:11:03,879 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 14:11:03,879 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 14:11:03,879 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 14:11:03,879 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 14:11:04,078 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 14:11:04,098 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 14:11:04,100 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 14:11:04,101 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 14:11:04,101 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 14:11:04,102 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_palindrome_ground.i [2023-04-02 14:11:05,137 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 14:11:05,286 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 14:11:05,286 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_palindrome_ground.i [2023-04-02 14:11:05,291 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7169cc895/299d9ed1ecd74e018e27b1b0b245f40d/FLAG7567861c7 [2023-04-02 14:11:05,304 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7169cc895/299d9ed1ecd74e018e27b1b0b245f40d [2023-04-02 14:11:05,306 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 14:11:05,307 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 14:11:05,309 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 14:11:05,309 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 14:11:05,311 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 14:11:05,312 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 02:11:05" (1/1) ... [2023-04-02 14:11:05,313 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7571a71e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:11:05, skipping insertion in model container [2023-04-02 14:11:05,313 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 02:11:05" (1/1) ... [2023-04-02 14:11:05,317 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 14:11:05,328 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 14:11:05,442 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_palindrome_ground.i[819,832] [2023-04-02 14:11:05,454 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 14:11:05,461 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 14:11:05,470 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_palindrome_ground.i[819,832] [2023-04-02 14:11:05,477 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 14:11:05,490 INFO L208 MainTranslator]: Completed translation [2023-04-02 14:11:05,490 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:11:05 WrapperNode [2023-04-02 14:11:05,490 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 14:11:05,491 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 14:11:05,491 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 14:11:05,491 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 14:11:05,499 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:11:05" (1/1) ... [2023-04-02 14:11:05,499 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:11:05" (1/1) ... [2023-04-02 14:11:05,504 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:11:05" (1/1) ... [2023-04-02 14:11:05,505 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:11:05" (1/1) ... [2023-04-02 14:11:05,516 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:11:05" (1/1) ... [2023-04-02 14:11:05,520 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:11:05" (1/1) ... [2023-04-02 14:11:05,523 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:11:05" (1/1) ... [2023-04-02 14:11:05,524 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:11:05" (1/1) ... [2023-04-02 14:11:05,527 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 14:11:05,527 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 14:11:05,528 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 14:11:05,528 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 14:11:05,529 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:11:05" (1/1) ... [2023-04-02 14:11:05,534 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 14:11:05,541 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:11:05,558 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 14:11:05,581 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 14:11:05,588 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 14:11:05,588 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 14:11:05,588 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 14:11:05,588 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 14:11:05,588 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 14:11:05,588 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 14:11:05,589 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 14:11:05,589 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-02 14:11:05,589 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-02 14:11:05,589 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 14:11:05,589 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 14:11:05,589 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 14:11:05,589 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 14:11:05,589 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 14:11:05,589 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-02 14:11:05,589 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 14:11:05,590 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 14:11:05,590 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 14:11:05,590 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 14:11:05,590 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 14:11:05,590 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 14:11:05,645 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 14:11:05,647 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 14:11:05,818 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 14:11:05,856 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 14:11:05,856 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-04-02 14:11:05,857 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 02:11:05 BoogieIcfgContainer [2023-04-02 14:11:05,858 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 14:11:05,859 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 14:11:05,859 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 14:11:05,862 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 14:11:05,862 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 02:11:05" (1/3) ... [2023-04-02 14:11:05,863 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@240b86ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 02:11:05, skipping insertion in model container [2023-04-02 14:11:05,863 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:11:05" (2/3) ... [2023-04-02 14:11:05,863 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@240b86ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 02:11:05, skipping insertion in model container [2023-04-02 14:11:05,863 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 02:11:05" (3/3) ... [2023-04-02 14:11:05,864 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_palindrome_ground.i [2023-04-02 14:11:05,875 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 14:11:05,875 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 14:11:05,918 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 14:11:05,923 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;@7dcbaee7, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 14:11:05,924 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 14:11:05,927 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 14:11:05,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-04-02 14:11:05,932 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:11:05,932 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:11:05,933 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:11:05,938 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:11:05,938 INFO L85 PathProgramCache]: Analyzing trace with hash 1628262345, now seen corresponding path program 1 times [2023-04-02 14:11:05,944 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:11:05,945 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1058405172] [2023-04-02 14:11:05,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:11:05,945 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:11:06,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:11:06,102 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 14:11:06,103 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:11:06,103 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1058405172] [2023-04-02 14:11:06,103 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1058405172] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 14:11:06,103 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 14:11:06,104 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-02 14:11:06,105 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [906838086] [2023-04-02 14:11:06,105 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 14:11:06,107 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 14:11:06,107 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:11:06,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 14:11:06,154 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 14:11:06,156 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 14:11:06,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:11:06,191 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2023-04-02 14:11:06,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 14:11:06,193 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 14:11:06,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:11:06,197 INFO L225 Difference]: With dead ends: 34 [2023-04-02 14:11:06,197 INFO L226 Difference]: Without dead ends: 18 [2023-04-02 14:11:06,199 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 14:11:06,201 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:11:06,202 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 27 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:11:06,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-04-02 14:11:06,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2023-04-02 14:11:06,220 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 14:11:06,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2023-04-02 14:11:06,222 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 12 [2023-04-02 14:11:06,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:11:06,222 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2023-04-02 14:11:06,222 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 14:11:06,222 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2023-04-02 14:11:06,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-04-02 14:11:06,223 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:11:06,223 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:11:06,223 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 14:11:06,223 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:11:06,223 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:11:06,224 INFO L85 PathProgramCache]: Analyzing trace with hash -402017198, now seen corresponding path program 1 times [2023-04-02 14:11:06,224 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:11:06,224 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [666626075] [2023-04-02 14:11:06,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:11:06,224 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:11:06,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:11:06,334 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 14:11:06,334 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:11:06,335 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [666626075] [2023-04-02 14:11:06,335 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [666626075] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:11:06,335 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1782005101] [2023-04-02 14:11:06,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:11:06,335 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:11:06,335 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:11:06,338 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 14:11:06,339 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 14:11:06,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:11:06,394 INFO L262 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-02 14:11:06,399 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:11:06,443 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 14:11:06,443 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:11:06,471 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 14:11:06,474 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1782005101] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:11:06,475 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [888380241] [2023-04-02 14:11:06,493 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-02 14:11:06,494 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:11:06,496 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:11:06,499 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:11:06,499 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:11:06,569 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:11:06,745 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-04-02 14:11:06,769 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:11:06,780 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:11:07,052 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '191#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|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|) (not (= (select (select |#memory_int| |v_main_~#A~0.base_BEFORE_CALL_1|) 399996) (select (select |#memory_int| |v_main_~#A~0.base_BEFORE_CALL_1|) 0))) (<= 3 (+ |v_main_~#A~0.base_BEFORE_CALL_1| |#StackHeapBarrier|)))) (= |#NULL.base| 0))' at error location [2023-04-02 14:11:07,052 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:11:07,052 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:11:07,052 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-02 14:11:07,053 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293153388] [2023-04-02 14:11:07,053 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:11:07,054 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-02 14:11:07,054 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:11:07,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-02 14:11:07,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2023-04-02 14:11:07,057 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 14:11:07,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:11:07,091 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2023-04-02 14:11:07,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 14:11:07,091 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 14:11:07,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:11:07,091 INFO L225 Difference]: With dead ends: 33 [2023-04-02 14:11:07,092 INFO L226 Difference]: Without dead ends: 22 [2023-04-02 14:11:07,092 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2023-04-02 14:11:07,093 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 6 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:11:07,093 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 22 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:11:07,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-04-02 14:11:07,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-04-02 14:11:07,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 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 14:11:07,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2023-04-02 14:11:07,096 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 14 [2023-04-02 14:11:07,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:11:07,097 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2023-04-02 14:11:07,097 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 14:11:07,097 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2023-04-02 14:11:07,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-02 14:11:07,097 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:11:07,097 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:11:07,105 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 14:11:07,304 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 14:11:07,304 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:11:07,305 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:11:07,305 INFO L85 PathProgramCache]: Analyzing trace with hash 1153154697, now seen corresponding path program 2 times [2023-04-02 14:11:07,305 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:11:07,305 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1415109247] [2023-04-02 14:11:07,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:11:07,305 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:11:07,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:11:07,412 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-02 14:11:07,413 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:11:07,414 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1415109247] [2023-04-02 14:11:07,414 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1415109247] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:11:07,414 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1880950717] [2023-04-02 14:11:07,414 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:11:07,415 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:11:07,415 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:11:07,416 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 14:11:07,418 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 14:11:07,473 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-02 14:11:07,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:11:07,474 INFO L262 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-02 14:11:07,476 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:11:07,497 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 14:11:07,497 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:11:07,527 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 14:11:07,528 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1880950717] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:11:07,528 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1196478808] [2023-04-02 14:11:07,533 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-02 14:11:07,533 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:11:07,534 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:11:07,534 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:11:07,534 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:11:07,568 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:11:07,637 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-04-02 14:11:07,652 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:11:07,656 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:11:07,879 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '407#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_main_~#A~0.base_BEFORE_CALL_2| Int)) (and (not (= (select (select |#memory_int| |v_main_~#A~0.base_BEFORE_CALL_2|) 0) (select (select |#memory_int| |v_main_~#A~0.base_BEFORE_CALL_2|) 399996))) (<= (+ |#StackHeapBarrier| 1) |v_main_~#A~0.base_BEFORE_CALL_2|) (<= 3 (+ |v_main_~#A~0.base_BEFORE_CALL_2| |#StackHeapBarrier|)) (<= 2 |v_main_~#A~0.base_BEFORE_CALL_2|))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:11:07,879 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:11:07,879 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:11:07,879 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 11 [2023-04-02 14:11:07,879 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954612862] [2023-04-02 14:11:07,879 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:11:07,880 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-02 14:11:07,880 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:11:07,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-02 14:11:07,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2023-04-02 14:11:07,881 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 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 14:11:07,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:11:07,914 INFO L93 Difference]: Finished difference Result 44 states and 57 transitions. [2023-04-02 14:11:07,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-02 14:11:07,915 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 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 18 [2023-04-02 14:11:07,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:11:07,916 INFO L225 Difference]: With dead ends: 44 [2023-04-02 14:11:07,916 INFO L226 Difference]: Without dead ends: 32 [2023-04-02 14:11:07,917 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2023-04-02 14:11:07,919 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:11:07,934 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:11:07,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-04-02 14:11:07,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2023-04-02 14:11:07,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 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 14:11:07,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2023-04-02 14:11:07,942 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 18 [2023-04-02 14:11:07,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:11:07,942 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2023-04-02 14:11:07,943 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 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 14:11:07,943 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2023-04-02 14:11:07,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-04-02 14:11:07,943 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:11:07,943 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:11:07,949 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 14:11:08,149 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 14:11:08,149 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:11:08,149 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:11:08,149 INFO L85 PathProgramCache]: Analyzing trace with hash -2001239223, now seen corresponding path program 3 times [2023-04-02 14:11:08,150 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:11:08,150 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2135887144] [2023-04-02 14:11:08,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:11:08,150 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:11:08,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:11:08,373 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-04-02 14:11:08,374 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:11:08,374 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2135887144] [2023-04-02 14:11:08,375 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2135887144] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:11:08,375 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1016218332] [2023-04-02 14:11:08,375 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:11:08,375 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:11:08,376 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:11:08,376 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 14:11:08,380 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 14:11:08,442 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:11:08,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:11:08,444 INFO L262 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-02 14:11:08,445 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:11:08,461 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-04-02 14:11:08,461 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:11:08,582 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-04-02 14:11:08,583 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1016218332] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:11:08,583 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [918411080] [2023-04-02 14:11:08,584 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-02 14:11:08,584 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:11:08,585 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:11:08,585 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:11:08,585 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:11:08,606 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:11:08,655 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-04-02 14:11:08,666 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:11:08,669 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:11:08,901 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '735#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_main_~#A~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_~#A~0.base_BEFORE_CALL_3|) 399996))) (<= (+ |#StackHeapBarrier| 1) |v_main_~#A~0.base_BEFORE_CALL_3|) (<= 2 |v_main_~#A~0.base_BEFORE_CALL_3|) (<= 3 (+ |v_main_~#A~0.base_BEFORE_CALL_3| |#StackHeapBarrier|)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:11:08,901 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:11:08,901 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:11:08,901 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2023-04-02 14:11:08,901 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907139105] [2023-04-02 14:11:08,902 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:11:08,902 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-04-02 14:11:08,902 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:11:08,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-04-02 14:11:08,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=686, Unknown=0, NotChecked=0, Total=930 [2023-04-02 14:11:08,903 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 21 states have internal predecessors, (29), 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 14:11:08,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:11:08,955 INFO L93 Difference]: Finished difference Result 61 states and 75 transitions. [2023-04-02 14:11:08,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-04-02 14:11:08,956 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 21 states have internal predecessors, (29), 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 28 [2023-04-02 14:11:08,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:11:08,956 INFO L225 Difference]: With dead ends: 61 [2023-04-02 14:11:08,956 INFO L226 Difference]: Without dead ends: 43 [2023-04-02 14:11:08,957 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 312 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=244, Invalid=686, Unknown=0, NotChecked=0, Total=930 [2023-04-02 14:11:08,957 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 9 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:11:08,958 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 34 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:11:08,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2023-04-02 14:11:08,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2023-04-02 14:11:08,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 37 states have internal predecessors, (40), 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 14:11:08,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2023-04-02 14:11:08,962 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 28 [2023-04-02 14:11:08,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:11:08,962 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2023-04-02 14:11:08,962 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 21 states have internal predecessors, (29), 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 14:11:08,962 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2023-04-02 14:11:08,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-04-02 14:11:08,963 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:11:08,963 INFO L195 NwaCegarLoop]: trace histogram [18, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:11:08,975 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 14:11:09,169 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 14:11:09,169 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:11:09,169 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:11:09,169 INFO L85 PathProgramCache]: Analyzing trace with hash -1476026303, now seen corresponding path program 4 times [2023-04-02 14:11:09,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:11:09,170 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1177321383] [2023-04-02 14:11:09,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:11:09,170 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:11:09,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:11:09,547 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-04-02 14:11:09,548 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:11:09,548 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1177321383] [2023-04-02 14:11:09,548 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1177321383] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:11:09,548 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [284654793] [2023-04-02 14:11:09,548 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:11:09,548 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:11:09,548 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:11:09,549 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 14:11:09,551 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 14:11:09,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:11:09,632 INFO L262 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 20 conjunts are in the unsatisfiable core [2023-04-02 14:11:09,633 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:11:09,660 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-04-02 14:11:09,660 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:11:10,086 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-04-02 14:11:10,086 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [284654793] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:11:10,087 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1708891685] [2023-04-02 14:11:10,090 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-02 14:11:10,090 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:11:10,091 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:11:10,091 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:11:10,091 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:11:10,106 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:11:10,149 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-04-02 14:11:10,160 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:11:10,163 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:11:10,441 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1205#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0) (exists ((|v_main_~#A~0.base_BEFORE_CALL_4| Int)) (and (<= (+ |#StackHeapBarrier| 1) |v_main_~#A~0.base_BEFORE_CALL_4|) (<= 3 (+ |v_main_~#A~0.base_BEFORE_CALL_4| |#StackHeapBarrier|)) (not (= (select (select |#memory_int| |v_main_~#A~0.base_BEFORE_CALL_4|) 0) (select (select |#memory_int| |v_main_~#A~0.base_BEFORE_CALL_4|) 399996))) (<= 2 |v_main_~#A~0.base_BEFORE_CALL_4|))))' at error location [2023-04-02 14:11:10,441 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:11:10,441 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:11:10,441 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 41 [2023-04-02 14:11:10,441 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32078045] [2023-04-02 14:11:10,442 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:11:10,442 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2023-04-02 14:11:10,442 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:11:10,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2023-04-02 14:11:10,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=854, Invalid=1696, Unknown=0, NotChecked=0, Total=2550 [2023-04-02 14:11:10,444 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 41 states, 41 states have (on average 1.1951219512195121) internal successors, (49), 41 states have internal predecessors, (49), 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 14:11:10,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:11:10,577 INFO L93 Difference]: Finished difference Result 92 states and 125 transitions. [2023-04-02 14:11:10,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2023-04-02 14:11:10,577 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.1951219512195121) internal successors, (49), 41 states have internal predecessors, (49), 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 39 [2023-04-02 14:11:10,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:11:10,579 INFO L225 Difference]: With dead ends: 92 [2023-04-02 14:11:10,579 INFO L226 Difference]: Without dead ends: 73 [2023-04-02 14:11:10,580 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 652 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=854, Invalid=1696, Unknown=0, NotChecked=0, Total=2550 [2023-04-02 14:11:10,581 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 3 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:11:10,581 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 88 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:11:10,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2023-04-02 14:11:10,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2023-04-02 14:11:10,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 67 states have (on average 1.044776119402985) internal successors, (70), 67 states have internal predecessors, (70), 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 14:11:10,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2023-04-02 14:11:10,597 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 39 [2023-04-02 14:11:10,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:11:10,597 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2023-04-02 14:11:10,597 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.1951219512195121) internal successors, (49), 41 states have internal predecessors, (49), 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 14:11:10,597 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2023-04-02 14:11:10,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2023-04-02 14:11:10,599 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:11:10,600 INFO L195 NwaCegarLoop]: trace histogram [38, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:11:10,619 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 14:11:10,809 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 14:11:10,809 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:11:10,809 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:11:10,809 INFO L85 PathProgramCache]: Analyzing trace with hash 2094544513, now seen corresponding path program 5 times [2023-04-02 14:11:10,810 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:11:10,810 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1269574228] [2023-04-02 14:11:10,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:11:10,810 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:11:10,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:11:11,953 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2023-04-02 14:11:11,953 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:11:11,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1269574228] [2023-04-02 14:11:11,953 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1269574228] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:11:11,954 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [724650545] [2023-04-02 14:11:11,954 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:11:11,954 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:11:11,954 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:11:11,955 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 14:11:11,957 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-02 14:11:28,844 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2023-04-02 14:11:28,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:11:28,862 INFO L262 TraceCheckSpWp]: Trace formula consists of 385 conjuncts, 21 conjunts are in the unsatisfiable core [2023-04-02 14:11:28,864 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:11:28,904 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2023-04-02 14:11:28,904 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:11:29,597 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2023-04-02 14:11:29,597 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [724650545] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:11:29,597 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2119912150] [2023-04-02 14:11:29,599 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-02 14:11:29,599 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:11:29,599 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:11:29,599 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:11:29,599 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:11:29,610 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:11:29,654 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-04-02 14:11:29,662 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:11:29,664 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:11:30,018 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1998#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_main_~#A~0.base_BEFORE_CALL_5| Int)) (and (<= 2 |v_main_~#A~0.base_BEFORE_CALL_5|) (not (= (select (select |#memory_int| |v_main_~#A~0.base_BEFORE_CALL_5|) 0) (select (select |#memory_int| |v_main_~#A~0.base_BEFORE_CALL_5|) 399996))) (<= (+ |#StackHeapBarrier| 1) |v_main_~#A~0.base_BEFORE_CALL_5|) (<= 3 (+ |v_main_~#A~0.base_BEFORE_CALL_5| |#StackHeapBarrier|)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:11:30,018 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:11:30,018 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:11:30,018 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 22, 22] total 62 [2023-04-02 14:11:30,019 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023266537] [2023-04-02 14:11:30,019 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:11:30,019 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2023-04-02 14:11:30,019 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:11:30,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2023-04-02 14:11:30,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1925, Invalid=3187, Unknown=0, NotChecked=0, Total=5112 [2023-04-02 14:11:30,022 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand has 62 states, 62 states have (on average 1.467741935483871) internal successors, (91), 62 states have internal predecessors, (91), 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 14:11:30,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:11:30,222 INFO L93 Difference]: Finished difference Result 163 states and 227 transitions. [2023-04-02 14:11:30,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2023-04-02 14:11:30,223 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.467741935483871) internal successors, (91), 62 states have internal predecessors, (91), 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 69 [2023-04-02 14:11:30,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:11:30,225 INFO L225 Difference]: With dead ends: 163 [2023-04-02 14:11:30,225 INFO L226 Difference]: Without dead ends: 134 [2023-04-02 14:11:30,227 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 177 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 914 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1925, Invalid=3187, Unknown=0, NotChecked=0, Total=5112 [2023-04-02 14:11:30,227 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:11:30,227 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 34 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:11:30,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2023-04-02 14:11:30,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 134. [2023-04-02 14:11:30,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 128 states have (on average 1.0234375) internal successors, (131), 128 states have internal predecessors, (131), 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 14:11:30,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 136 transitions. [2023-04-02 14:11:30,250 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 136 transitions. Word has length 69 [2023-04-02 14:11:30,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:11:30,251 INFO L495 AbstractCegarLoop]: Abstraction has 134 states and 136 transitions. [2023-04-02 14:11:30,251 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 1.467741935483871) internal successors, (91), 62 states have internal predecessors, (91), 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 14:11:30,251 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 136 transitions. [2023-04-02 14:11:30,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2023-04-02 14:11:30,255 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:11:30,255 INFO L195 NwaCegarLoop]: trace histogram [59, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:11:30,270 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-02 14:11:30,455 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:11:30,455 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:11:30,456 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:11:30,456 INFO L85 PathProgramCache]: Analyzing trace with hash -1605222286, now seen corresponding path program 6 times [2023-04-02 14:11:30,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:11:30,456 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [827558871] [2023-04-02 14:11:30,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:11:30,456 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:11:30,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:11:33,180 INFO L134 CoverageAnalysis]: Checked inductivity of 3540 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2023-04-02 14:11:33,180 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:11:33,180 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [827558871] [2023-04-02 14:11:33,180 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [827558871] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:11:33,180 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [107360296] [2023-04-02 14:11:33,180 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:11:33,180 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:11:33,180 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:11:33,181 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:11:33,183 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-02 14:11:33,424 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:11:33,424 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:11:33,427 INFO L262 TraceCheckSpWp]: Trace formula consists of 1016 conjuncts, 61 conjunts are in the unsatisfiable core [2023-04-02 14:11:33,431 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:11:33,526 INFO L134 CoverageAnalysis]: Checked inductivity of 3540 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2023-04-02 14:11:33,526 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:11:36,741 INFO L134 CoverageAnalysis]: Checked inductivity of 3540 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2023-04-02 14:11:36,741 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [107360296] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:11:36,741 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [788912419] [2023-04-02 14:11:36,753 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-02 14:11:36,753 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:11:36,753 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:11:36,754 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:11:36,754 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:11:36,768 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:11:36,802 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-04-02 14:11:36,809 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:11:36,813 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:11:37,268 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3482#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_main_~#A~0.base_BEFORE_CALL_6| Int)) (and (not (= (select (select |#memory_int| |v_main_~#A~0.base_BEFORE_CALL_6|) 0) (select (select |#memory_int| |v_main_~#A~0.base_BEFORE_CALL_6|) 399996))) (<= (+ |#StackHeapBarrier| 1) |v_main_~#A~0.base_BEFORE_CALL_6|) (<= 3 (+ |v_main_~#A~0.base_BEFORE_CALL_6| |#StackHeapBarrier|)) (<= 2 |v_main_~#A~0.base_BEFORE_CALL_6|))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:11:37,268 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:11:37,268 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:11:37,269 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 123 [2023-04-02 14:11:37,269 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253335] [2023-04-02 14:11:37,269 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:11:37,269 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2023-04-02 14:11:37,270 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:11:37,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2023-04-02 14:11:37,278 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7537, Invalid=10019, Unknown=0, NotChecked=0, Total=17556 [2023-04-02 14:11:37,278 INFO L87 Difference]: Start difference. First operand 134 states and 136 transitions. Second operand has 123 states, 123 states have (on average 1.065040650406504) internal successors, (131), 123 states have internal predecessors, (131), 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 14:11:38,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:11:38,094 INFO L93 Difference]: Finished difference Result 265 states and 330 transitions. [2023-04-02 14:11:38,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2023-04-02 14:11:38,094 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 1.065040650406504) internal successors, (131), 123 states have internal predecessors, (131), 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 130 [2023-04-02 14:11:38,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:11:38,095 INFO L225 Difference]: With dead ends: 265 [2023-04-02 14:11:38,095 INFO L226 Difference]: Without dead ends: 196 [2023-04-02 14:11:38,099 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 451 GetRequests, 320 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2046 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=7537, Invalid=10019, Unknown=0, NotChecked=0, Total=17556 [2023-04-02 14:11:38,099 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 15 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 262 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 476 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 262 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 14:11:38,100 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 90 Invalid, 476 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [262 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 14:11:38,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2023-04-02 14:11:38,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2023-04-02 14:11:38,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 190 states have (on average 1.0157894736842106) internal successors, (193), 190 states have internal predecessors, (193), 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 14:11:38,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 198 transitions. [2023-04-02 14:11:38,107 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 198 transitions. Word has length 130 [2023-04-02 14:11:38,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:11:38,108 INFO L495 AbstractCegarLoop]: Abstraction has 196 states and 198 transitions. [2023-04-02 14:11:38,108 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 1.065040650406504) internal successors, (131), 123 states have internal predecessors, (131), 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 14:11:38,108 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 198 transitions. [2023-04-02 14:11:38,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2023-04-02 14:11:38,109 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:11:38,109 INFO L195 NwaCegarLoop]: trace histogram [120, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:11:38,117 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-04-02 14:11:38,315 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:11:38,316 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:11:38,316 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:11:38,316 INFO L85 PathProgramCache]: Analyzing trace with hash -916534711, now seen corresponding path program 7 times [2023-04-02 14:11:38,316 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:11:38,316 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1470412832] [2023-04-02 14:11:38,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:11:38,317 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:11:38,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:11:45,729 INFO L134 CoverageAnalysis]: Checked inductivity of 9090 backedges. 0 proven. 7260 refuted. 0 times theorem prover too weak. 1830 trivial. 0 not checked. [2023-04-02 14:11:45,731 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:11:45,731 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1470412832] [2023-04-02 14:11:45,731 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1470412832] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:11:45,731 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [491886283] [2023-04-02 14:11:45,731 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:11:45,731 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:11:45,731 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:11:45,732 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:11:45,733 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-02 14:11:46,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:11:46,105 INFO L262 TraceCheckSpWp]: Trace formula consists of 1572 conjuncts, 122 conjunts are in the unsatisfiable core [2023-04-02 14:11:46,112 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:11:46,294 INFO L134 CoverageAnalysis]: Checked inductivity of 9090 backedges. 0 proven. 7260 refuted. 0 times theorem prover too weak. 1830 trivial. 0 not checked. [2023-04-02 14:11:46,295 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:11:59,083 INFO L134 CoverageAnalysis]: Checked inductivity of 9090 backedges. 0 proven. 7260 refuted. 0 times theorem prover too weak. 1830 trivial. 0 not checked. [2023-04-02 14:11:59,083 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [491886283] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:11:59,083 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [981347190] [2023-04-02 14:11:59,084 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-02 14:11:59,084 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:11:59,084 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:11:59,085 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:11:59,085 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:11:59,105 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:11:59,134 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-04-02 14:11:59,141 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:11:59,143 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:11:59,858 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5788#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_main_~#A~0.base_BEFORE_CALL_7| Int)) (and (not (= (select (select |#memory_int| |v_main_~#A~0.base_BEFORE_CALL_7|) 399996) (select (select |#memory_int| |v_main_~#A~0.base_BEFORE_CALL_7|) 0))) (<= 3 (+ |v_main_~#A~0.base_BEFORE_CALL_7| |#StackHeapBarrier|)) (<= 2 |v_main_~#A~0.base_BEFORE_CALL_7|) (<= (+ |#StackHeapBarrier| 1) |v_main_~#A~0.base_BEFORE_CALL_7|))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:11:59,858 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:11:59,858 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:11:59,858 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [123, 123, 123] total 245 [2023-04-02 14:11:59,858 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43180519] [2023-04-02 14:11:59,859 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:11:59,859 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 245 states [2023-04-02 14:11:59,859 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:11:59,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 245 interpolants. [2023-04-02 14:11:59,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29924, Invalid=34846, Unknown=0, NotChecked=0, Total=64770 [2023-04-02 14:11:59,871 INFO L87 Difference]: Start difference. First operand 196 states and 198 transitions. Second operand has 245 states, 245 states have (on average 1.0326530612244897) internal successors, (253), 245 states have internal predecessors, (253), 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 14:12:07,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:12:07,177 INFO L93 Difference]: Finished difference Result 449 states and 635 transitions. [2023-04-02 14:12:07,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 244 states. [2023-04-02 14:12:07,177 INFO L78 Accepts]: Start accepts. Automaton has has 245 states, 245 states have (on average 1.0326530612244897) internal successors, (253), 245 states have internal predecessors, (253), 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 192 [2023-04-02 14:12:07,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:12:07,179 INFO L225 Difference]: With dead ends: 449 [2023-04-02 14:12:07,179 INFO L226 Difference]: Without dead ends: 379 [2023-04-02 14:12:07,183 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 698 GetRequests, 445 SyntacticMatches, 0 SemanticMatches, 253 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4120 ImplicationChecksByTransitivity, 17.6s TimeCoverageRelationStatistics Valid=29924, Invalid=34846, Unknown=0, NotChecked=0, Total=64770 [2023-04-02 14:12:07,184 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 15 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 396 mSolverCounterSat, 922 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 1318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 922 IncrementalHoareTripleChecker+Valid, 396 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-04-02 14:12:07,184 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 107 Invalid, 1318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [922 Valid, 396 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-04-02 14:12:07,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379 states. [2023-04-02 14:12:07,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379 to 379. [2023-04-02 14:12:07,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 379 states, 373 states have (on average 1.0080428954423593) internal successors, (376), 373 states have internal predecessors, (376), 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 14:12:07,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 381 transitions. [2023-04-02 14:12:07,198 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 381 transitions. Word has length 192 [2023-04-02 14:12:07,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:12:07,199 INFO L495 AbstractCegarLoop]: Abstraction has 379 states and 381 transitions. [2023-04-02 14:12:07,199 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 245 states, 245 states have (on average 1.0326530612244897) internal successors, (253), 245 states have internal predecessors, (253), 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 14:12:07,199 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 381 transitions. [2023-04-02 14:12:07,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 376 [2023-04-02 14:12:07,203 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:12:07,203 INFO L195 NwaCegarLoop]: trace histogram [242, 121, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:12:07,212 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-04-02 14:12:07,411 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:12:07,412 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:12:07,412 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:12:07,412 INFO L85 PathProgramCache]: Analyzing trace with hash 2045339201, now seen corresponding path program 8 times [2023-04-02 14:12:07,412 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:12:07,412 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172298720] [2023-04-02 14:12:07,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:12:07,413 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:12:07,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:12:35,946 INFO L134 CoverageAnalysis]: Checked inductivity of 36784 backedges. 0 proven. 29403 refuted. 0 times theorem prover too weak. 7381 trivial. 0 not checked. [2023-04-02 14:12:35,946 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:12:35,946 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172298720] [2023-04-02 14:12:35,946 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1172298720] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:12:35,947 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [124225609] [2023-04-02 14:12:35,947 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:12:35,947 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:12:35,947 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:12:35,948 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:12:35,949 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process