/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain IntervalDomain -i ../sv-benchmarks/c/array-examples/standard_copy8_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-03-31 20:36:44,792 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-03-31 20:36:44,794 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-03-31 20:36:44,820 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-03-31 20:36:44,820 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-03-31 20:36:44,823 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-03-31 20:36:44,829 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-03-31 20:36:44,832 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-03-31 20:36:44,833 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-03-31 20:36:44,838 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-03-31 20:36:44,839 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-03-31 20:36:44,839 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-03-31 20:36:44,840 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-03-31 20:36:44,840 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-03-31 20:36:44,841 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-03-31 20:36:44,842 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-03-31 20:36:44,842 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-03-31 20:36:44,843 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-03-31 20:36:44,844 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-03-31 20:36:44,845 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-03-31 20:36:44,846 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-03-31 20:36:44,851 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-03-31 20:36:44,853 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-03-31 20:36:44,854 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-03-31 20:36:44,864 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-03-31 20:36:44,867 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-03-31 20:36:44,868 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-03-31 20:36:44,869 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-03-31 20:36:44,869 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-03-31 20:36:44,870 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-03-31 20:36:44,870 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-03-31 20:36:44,871 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-03-31 20:36:44,871 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-03-31 20:36:44,871 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-03-31 20:36:44,872 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-03-31 20:36:44,872 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-03-31 20:36:44,874 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-03-31 20:36:44,909 INFO L113 SettingsManager]: Loading preferences was successful [2023-03-31 20:36:44,910 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-03-31 20:36:44,910 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-03-31 20:36:44,910 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-03-31 20:36:44,911 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-03-31 20:36:44,911 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-03-31 20:36:44,911 INFO L138 SettingsManager]: * User list type=DISABLED [2023-03-31 20:36:44,911 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-03-31 20:36:44,912 INFO L138 SettingsManager]: * Explicit value domain=true [2023-03-31 20:36:44,912 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-03-31 20:36:44,912 INFO L138 SettingsManager]: * Octagon Domain=false [2023-03-31 20:36:44,913 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-03-31 20:36:44,913 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-03-31 20:36:44,913 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-03-31 20:36:44,913 INFO L138 SettingsManager]: * Interval Domain=false [2023-03-31 20:36:44,913 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-03-31 20:36:44,913 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-03-31 20:36:44,913 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-03-31 20:36:44,914 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-03-31 20:36:44,914 INFO L138 SettingsManager]: * sizeof long=4 [2023-03-31 20:36:44,914 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-03-31 20:36:44,914 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-03-31 20:36:44,914 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-03-31 20:36:44,914 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-03-31 20:36:44,915 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-03-31 20:36:44,915 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-03-31 20:36:44,915 INFO L138 SettingsManager]: * sizeof long double=12 [2023-03-31 20:36:44,915 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-03-31 20:36:44,915 INFO L138 SettingsManager]: * Use constant arrays=true [2023-03-31 20:36:44,915 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-03-31 20:36:44,915 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-03-31 20:36:44,915 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-03-31 20:36:44,916 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 20:36:44,916 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-03-31 20:36:44,916 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-03-31 20:36:44,916 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-03-31 20:36:44,916 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-03-31 20:36:44,916 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-03-31 20:36:44,916 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-03-31 20:36:44,916 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-03-31 20:36:44,917 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-03-31 20:36:44,917 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> IntervalDomain [2023-03-31 20:36:45,149 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-03-31 20:36:45,168 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-03-31 20:36:45,172 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-03-31 20:36:45,173 INFO L271 PluginConnector]: Initializing CDTParser... [2023-03-31 20:36:45,174 INFO L275 PluginConnector]: CDTParser initialized [2023-03-31 20:36:45,175 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_copy8_ground-2.i [2023-03-31 20:36:46,332 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-03-31 20:36:46,546 INFO L351 CDTParser]: Found 1 translation units. [2023-03-31 20:36:46,547 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_copy8_ground-2.i [2023-03-31 20:36:46,553 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a12edcbba/9943f2bcbb724894975e8c2d9d716b85/FLAG754ecb3bb [2023-03-31 20:36:46,570 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a12edcbba/9943f2bcbb724894975e8c2d9d716b85 [2023-03-31 20:36:46,573 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-03-31 20:36:46,575 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-03-31 20:36:46,577 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-03-31 20:36:46,577 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-03-31 20:36:46,579 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-03-31 20:36:46,580 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 08:36:46" (1/1) ... [2023-03-31 20:36:46,581 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@58ca9466 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:36:46, skipping insertion in model container [2023-03-31 20:36:46,582 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 08:36:46" (1/1) ... [2023-03-31 20:36:46,588 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-03-31 20:36:46,602 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-03-31 20:36:46,744 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_copy8_ground-2.i[816,829] [2023-03-31 20:36:46,774 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 20:36:46,782 INFO L203 MainTranslator]: Completed pre-run [2023-03-31 20:36:46,792 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_copy8_ground-2.i[816,829] [2023-03-31 20:36:46,805 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 20:36:46,815 INFO L208 MainTranslator]: Completed translation [2023-03-31 20:36:46,816 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:36:46 WrapperNode [2023-03-31 20:36:46,816 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-03-31 20:36:46,817 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-03-31 20:36:46,817 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-03-31 20:36:46,817 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-03-31 20:36:46,827 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:36:46" (1/1) ... [2023-03-31 20:36:46,828 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:36:46" (1/1) ... [2023-03-31 20:36:46,834 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:36:46" (1/1) ... [2023-03-31 20:36:46,834 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:36:46" (1/1) ... [2023-03-31 20:36:46,845 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:36:46" (1/1) ... [2023-03-31 20:36:46,853 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:36:46" (1/1) ... [2023-03-31 20:36:46,855 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:36:46" (1/1) ... [2023-03-31 20:36:46,856 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:36:46" (1/1) ... [2023-03-31 20:36:46,858 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-03-31 20:36:46,861 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-03-31 20:36:46,861 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-03-31 20:36:46,861 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-03-31 20:36:46,861 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:36:46" (1/1) ... [2023-03-31 20:36:46,872 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 20:36:46,881 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:36:46,891 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-03-31 20:36:46,893 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-03-31 20:36:46,919 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-03-31 20:36:46,920 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-03-31 20:36:46,920 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-03-31 20:36:46,920 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-03-31 20:36:46,920 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-03-31 20:36:46,920 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-03-31 20:36:46,920 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-03-31 20:36:46,920 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-03-31 20:36:46,920 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-03-31 20:36:46,921 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-03-31 20:36:46,921 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-03-31 20:36:46,921 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-03-31 20:36:46,921 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-03-31 20:36:46,921 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-03-31 20:36:46,921 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-03-31 20:36:46,921 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-03-31 20:36:46,921 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-03-31 20:36:46,922 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-03-31 20:36:46,922 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-03-31 20:36:46,922 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-03-31 20:36:46,922 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-03-31 20:36:46,984 INFO L236 CfgBuilder]: Building ICFG [2023-03-31 20:36:46,985 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-03-31 20:36:47,270 INFO L277 CfgBuilder]: Performing block encoding [2023-03-31 20:36:47,342 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-03-31 20:36:47,343 INFO L302 CfgBuilder]: Removed 10 assume(true) statements. [2023-03-31 20:36:47,354 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 08:36:47 BoogieIcfgContainer [2023-03-31 20:36:47,354 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-03-31 20:36:47,356 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-03-31 20:36:47,356 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-03-31 20:36:47,359 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-03-31 20:36:47,359 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.03 08:36:46" (1/3) ... [2023-03-31 20:36:47,360 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b89cb9f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 08:36:47, skipping insertion in model container [2023-03-31 20:36:47,360 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:36:46" (2/3) ... [2023-03-31 20:36:47,360 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b89cb9f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 08:36:47, skipping insertion in model container [2023-03-31 20:36:47,361 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 08:36:47" (3/3) ... [2023-03-31 20:36:47,362 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_copy8_ground-2.i [2023-03-31 20:36:47,377 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-03-31 20:36:47,377 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-03-31 20:36:47,435 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-03-31 20:36:47,442 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;@746260e9, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-03-31 20:36:47,443 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-03-31 20:36:47,446 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 19 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 20:36:47,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-03-31 20:36:47,453 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:36:47,454 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:36:47,454 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:36:47,461 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:36:47,462 INFO L85 PathProgramCache]: Analyzing trace with hash -42571426, now seen corresponding path program 1 times [2023-03-31 20:36:47,471 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:36:47,471 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [492782603] [2023-03-31 20:36:47,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:36:47,472 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:36:47,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:36:47,864 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:36:47,865 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:36:47,865 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [492782603] [2023-03-31 20:36:47,865 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [492782603] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 20:36:47,865 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 20:36:47,866 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-03-31 20:36:47,867 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278051878] [2023-03-31 20:36:47,868 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 20:36:47,871 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 20:36:47,871 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:36:47,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 20:36:47,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 20:36:47,907 INFO L87 Difference]: Start difference. First operand has 26 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 19 states have internal predecessors, (30), 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 5.0) internal successors, (15), 3 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) [2023-03-31 20:36:47,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:36:47,966 INFO L93 Difference]: Finished difference Result 47 states and 68 transitions. [2023-03-31 20:36:47,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 20:36:47,968 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 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 19 [2023-03-31 20:36:47,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:36:47,974 INFO L225 Difference]: With dead ends: 47 [2023-03-31 20:36:47,974 INFO L226 Difference]: Without dead ends: 24 [2023-03-31 20:36:47,977 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 [2023-03-31 20:36:47,980 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 20:36:47,981 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 27 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 20:36:47,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-03-31 20:36:48,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-03-31 20:36:48,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 18 states have internal predecessors, (28), 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) [2023-03-31 20:36:48,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 33 transitions. [2023-03-31 20:36:48,010 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 33 transitions. Word has length 19 [2023-03-31 20:36:48,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:36:48,010 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 33 transitions. [2023-03-31 20:36:48,010 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 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) [2023-03-31 20:36:48,011 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 33 transitions. [2023-03-31 20:36:48,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-03-31 20:36:48,011 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:36:48,011 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:36:48,012 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-03-31 20:36:48,012 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:36:48,012 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:36:48,013 INFO L85 PathProgramCache]: Analyzing trace with hash 239722589, now seen corresponding path program 1 times [2023-03-31 20:36:48,013 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:36:48,013 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [147838070] [2023-03-31 20:36:48,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:36:48,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:36:48,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:36:48,124 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:36:48,124 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:36:48,125 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [147838070] [2023-03-31 20:36:48,125 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [147838070] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:36:48,125 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [609509574] [2023-03-31 20:36:48,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:36:48,125 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:36:48,125 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:36:48,128 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:36:48,160 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-03-31 20:36:48,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:36:48,281 INFO L262 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 2 conjunts are in the unsatisfiable core [2023-03-31 20:36:48,289 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:36:48,318 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-03-31 20:36:48,319 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-03-31 20:36:48,323 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [609509574] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 20:36:48,323 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-03-31 20:36:48,323 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2023-03-31 20:36:48,324 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132278251] [2023-03-31 20:36:48,325 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 20:36:48,327 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 20:36:48,327 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:36:48,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 20:36:48,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-03-31 20:36:48,333 INFO L87 Difference]: Start difference. First operand 24 states and 33 transitions. Second operand has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:36:48,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:36:48,402 INFO L93 Difference]: Finished difference Result 48 states and 72 transitions. [2023-03-31 20:36:48,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 20:36:48,404 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2023-03-31 20:36:48,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:36:48,405 INFO L225 Difference]: With dead ends: 48 [2023-03-31 20:36:48,405 INFO L226 Difference]: Without dead ends: 32 [2023-03-31 20:36:48,406 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-03-31 20:36:48,407 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 20:36:48,407 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 24 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 20:36:48,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-03-31 20:36:48,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2023-03-31 20:36:48,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 26 states have (on average 1.3846153846153846) internal successors, (36), 26 states have internal predecessors, (36), 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) [2023-03-31 20:36:48,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 41 transitions. [2023-03-31 20:36:48,413 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 41 transitions. Word has length 20 [2023-03-31 20:36:48,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:36:48,414 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 41 transitions. [2023-03-31 20:36:48,414 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:36:48,414 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 41 transitions. [2023-03-31 20:36:48,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-03-31 20:36:48,415 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:36:48,416 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:36:48,427 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-03-31 20:36:48,621 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 [2023-03-31 20:36:48,621 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:36:48,622 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:36:48,622 INFO L85 PathProgramCache]: Analyzing trace with hash 848062071, now seen corresponding path program 1 times [2023-03-31 20:36:48,622 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:36:48,622 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [951529085] [2023-03-31 20:36:48,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:36:48,623 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:36:48,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:36:48,807 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-03-31 20:36:48,808 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:36:48,808 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [951529085] [2023-03-31 20:36:48,808 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [951529085] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:36:48,808 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [785587350] [2023-03-31 20:36:48,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:36:48,809 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:36:48,809 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:36:48,811 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:36:48,814 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-03-31 20:36:48,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:36:48,924 INFO L262 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 3 conjunts are in the unsatisfiable core [2023-03-31 20:36:48,925 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:36:48,950 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-03-31 20:36:48,951 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:36:48,988 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-03-31 20:36:48,988 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [785587350] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:36:48,988 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1339981668] [2023-03-31 20:36:49,008 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-03-31 20:36:49,009 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:36:49,012 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:36:49,017 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:36:49,017 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:36:49,105 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 20:36:49,744 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-03-31 20:36:49,763 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 20:36:49,767 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:36:50,211 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '522#(and (exists ((|v_main_~#a1~0.base_BEFORE_CALL_1| Int) (|v_main_~#a9~0.base_BEFORE_CALL_1| Int)) (and (<= 0 |v_main_~#a1~0.base_BEFORE_CALL_1|) (not (= (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_1|) 0) (select (select |#memory_int| |v_main_~#a9~0.base_BEFORE_CALL_1|) 0))) (<= 0 |v_main_~#a9~0.base_BEFORE_CALL_1|))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:36:50,211 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:36:50,211 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:36:50,211 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-03-31 20:36:50,211 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931351470] [2023-03-31 20:36:50,212 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:36:50,213 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-03-31 20:36:50,213 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:36:50,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-03-31 20:36:50,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2023-03-31 20:36:50,217 INFO L87 Difference]: Start difference. First operand 32 states and 41 transitions. Second operand has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 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) [2023-03-31 20:36:50,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:36:50,299 INFO L93 Difference]: Finished difference Result 60 states and 80 transitions. [2023-03-31 20:36:50,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-03-31 20:36:50,300 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 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 [2023-03-31 20:36:50,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:36:50,302 INFO L225 Difference]: With dead ends: 60 [2023-03-31 20:36:50,302 INFO L226 Difference]: Without dead ends: 35 [2023-03-31 20:36:50,303 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2023-03-31 20:36:50,305 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:36:50,307 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:36:50,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-03-31 20:36:50,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2023-03-31 20:36:50,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 29 states have (on average 1.3448275862068966) internal successors, (39), 29 states have internal predecessors, (39), 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) [2023-03-31 20:36:50,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 44 transitions. [2023-03-31 20:36:50,317 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 44 transitions. Word has length 28 [2023-03-31 20:36:50,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:36:50,318 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 44 transitions. [2023-03-31 20:36:50,318 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 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) [2023-03-31 20:36:50,318 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 44 transitions. [2023-03-31 20:36:50,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-03-31 20:36:50,319 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:36:50,320 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:36:50,329 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-03-31 20:36:50,529 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 [2023-03-31 20:36:50,529 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:36:50,530 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:36:50,530 INFO L85 PathProgramCache]: Analyzing trace with hash 1998972472, now seen corresponding path program 2 times [2023-03-31 20:36:50,530 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:36:50,530 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [552628414] [2023-03-31 20:36:50,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:36:50,530 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:36:50,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:36:50,650 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-03-31 20:36:50,651 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:36:50,651 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [552628414] [2023-03-31 20:36:50,651 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [552628414] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:36:50,651 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [321129668] [2023-03-31 20:36:50,651 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 20:36:50,652 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:36:50,652 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:36:50,653 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) [2023-03-31 20:36:50,655 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-03-31 20:36:50,805 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-03-31 20:36:50,806 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:36:50,808 INFO L262 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 3 conjunts are in the unsatisfiable core [2023-03-31 20:36:50,810 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:36:50,821 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-03-31 20:36:50,822 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:36:50,839 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-03-31 20:36:50,839 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [321129668] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:36:50,840 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1106226003] [2023-03-31 20:36:50,843 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-03-31 20:36:50,843 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:36:50,843 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:36:50,844 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:36:50,845 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:36:50,864 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 20:36:51,195 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-03-31 20:36:51,205 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 20:36:51,208 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:36:51,578 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '893#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (exists ((|v_main_~#a1~0.base_BEFORE_CALL_2| Int) (|v_main_~#a9~0.base_BEFORE_CALL_2| Int)) (and (<= 0 |v_main_~#a1~0.base_BEFORE_CALL_2|) (not (= (select (select |#memory_int| |v_main_~#a9~0.base_BEFORE_CALL_2|) 0) (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_2|) 0))) (<= 0 |v_main_~#a9~0.base_BEFORE_CALL_2|))) (= |#NULL.base| 0))' at error location [2023-03-31 20:36:51,578 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:36:51,579 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:36:51,579 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-03-31 20:36:51,579 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369039238] [2023-03-31 20:36:51,579 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:36:51,579 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-03-31 20:36:51,579 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:36:51,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-03-31 20:36:51,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2023-03-31 20:36:51,580 INFO L87 Difference]: Start difference. First operand 35 states and 44 transitions. Second operand has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 7 states have internal predecessors, (36), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:36:51,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:36:51,679 INFO L93 Difference]: Finished difference Result 82 states and 122 transitions. [2023-03-31 20:36:51,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-03-31 20:36:51,680 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 7 states have internal predecessors, (36), 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 31 [2023-03-31 20:36:51,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:36:51,680 INFO L225 Difference]: With dead ends: 82 [2023-03-31 20:36:51,680 INFO L226 Difference]: Without dead ends: 59 [2023-03-31 20:36:51,681 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2023-03-31 20:36:51,682 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:36:51,682 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 24 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:36:51,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-03-31 20:36:51,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2023-03-31 20:36:51,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 53 states have (on average 1.1886792452830188) internal successors, (63), 53 states have internal predecessors, (63), 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) [2023-03-31 20:36:51,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 68 transitions. [2023-03-31 20:36:51,688 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 68 transitions. Word has length 31 [2023-03-31 20:36:51,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:36:51,689 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 68 transitions. [2023-03-31 20:36:51,689 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 7 states have internal predecessors, (36), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:36:51,689 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 68 transitions. [2023-03-31 20:36:51,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2023-03-31 20:36:51,690 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:36:51,690 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:36:51,697 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-03-31 20:36:51,890 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 [2023-03-31 20:36:51,891 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:36:51,891 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:36:51,891 INFO L85 PathProgramCache]: Analyzing trace with hash -1894438626, now seen corresponding path program 3 times [2023-03-31 20:36:51,892 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:36:51,892 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1753391586] [2023-03-31 20:36:51,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:36:51,892 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:36:51,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:36:52,101 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2023-03-31 20:36:52,101 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:36:52,101 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1753391586] [2023-03-31 20:36:52,101 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1753391586] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:36:52,101 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1532282106] [2023-03-31 20:36:52,101 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 20:36:52,102 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:36:52,102 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:36:52,103 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) [2023-03-31 20:36:52,105 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-03-31 20:36:52,284 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 20:36:52,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:36:52,287 INFO L262 TraceCheckSpWp]: Trace formula consists of 537 conjuncts, 6 conjunts are in the unsatisfiable core [2023-03-31 20:36:52,292 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:36:52,309 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2023-03-31 20:36:52,309 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:36:52,358 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2023-03-31 20:36:52,359 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1532282106] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:36:52,359 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1476278239] [2023-03-31 20:36:52,361 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-03-31 20:36:52,361 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:36:52,361 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:36:52,361 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:36:52,362 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:36:52,375 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 20:36:52,667 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-03-31 20:36:52,677 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 20:36:52,680 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:36:53,044 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1506#(and (exists ((|v_main_~#a1~0.base_BEFORE_CALL_3| Int) (|v_main_~#a9~0.base_BEFORE_CALL_3| Int)) (and (<= 0 |v_main_~#a9~0.base_BEFORE_CALL_3|) (not (= (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_3|) 0) (select (select |#memory_int| |v_main_~#a9~0.base_BEFORE_CALL_3|) 0))) (<= 0 |v_main_~#a1~0.base_BEFORE_CALL_3|))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:36:53,044 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:36:53,044 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:36:53,044 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2023-03-31 20:36:53,044 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321729037] [2023-03-31 20:36:53,044 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:36:53,045 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-03-31 20:36:53,045 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:36:53,046 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-03-31 20:36:53,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=434, Unknown=0, NotChecked=0, Total=552 [2023-03-31 20:36:53,046 INFO L87 Difference]: Start difference. First operand 59 states and 68 transitions. Second operand has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:36:53,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:36:53,114 INFO L93 Difference]: Finished difference Result 114 states and 137 transitions. [2023-03-31 20:36:53,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-03-31 20:36:53,115 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 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 55 [2023-03-31 20:36:53,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:36:53,115 INFO L225 Difference]: With dead ends: 114 [2023-03-31 20:36:53,115 INFO L226 Difference]: Without dead ends: 65 [2023-03-31 20:36:53,116 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=434, Unknown=0, NotChecked=0, Total=552 [2023-03-31 20:36:53,116 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:36:53,117 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:36:53,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-03-31 20:36:53,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2023-03-31 20:36:53,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 59 states have (on average 1.1694915254237288) internal successors, (69), 59 states have internal predecessors, (69), 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) [2023-03-31 20:36:53,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 74 transitions. [2023-03-31 20:36:53,122 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 74 transitions. Word has length 55 [2023-03-31 20:36:53,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:36:53,123 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 74 transitions. [2023-03-31 20:36:53,123 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:36:53,123 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 74 transitions. [2023-03-31 20:36:53,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-03-31 20:36:53,123 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:36:53,123 INFO L195 NwaCegarLoop]: trace histogram [10, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:36:53,135 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-03-31 20:36:53,324 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 [2023-03-31 20:36:53,324 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:36:53,325 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:36:53,325 INFO L85 PathProgramCache]: Analyzing trace with hash -1530195778, now seen corresponding path program 4 times [2023-03-31 20:36:53,325 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:36:53,325 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1366232723] [2023-03-31 20:36:53,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:36:53,325 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:36:53,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:36:53,684 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2023-03-31 20:36:53,685 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:36:53,685 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1366232723] [2023-03-31 20:36:53,685 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1366232723] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:36:53,685 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [873262918] [2023-03-31 20:36:53,685 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 20:36:53,685 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:36:53,685 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:36:53,686 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) [2023-03-31 20:36:53,689 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-03-31 20:36:53,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:36:53,880 INFO L262 TraceCheckSpWp]: Trace formula consists of 639 conjuncts, 12 conjunts are in the unsatisfiable core [2023-03-31 20:36:53,889 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:36:53,909 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2023-03-31 20:36:53,909 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:36:54,091 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2023-03-31 20:36:54,092 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [873262918] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:36:54,092 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [949941499] [2023-03-31 20:36:54,095 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-03-31 20:36:54,095 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:36:54,096 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:36:54,096 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:36:54,096 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:36:54,125 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 20:36:54,387 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-03-31 20:36:54,398 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 20:36:54,401 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:36:54,801 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2243#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_main_~#a1~0.base_BEFORE_CALL_4| Int) (|v_main_~#a9~0.base_BEFORE_CALL_4| Int)) (and (not (= (select (select |#memory_int| |v_main_~#a9~0.base_BEFORE_CALL_4|) 0) (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_4|) 0))) (<= 0 |v_main_~#a1~0.base_BEFORE_CALL_4|) (<= 0 |v_main_~#a9~0.base_BEFORE_CALL_4|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:36:54,802 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:36:54,802 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:36:54,802 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2023-03-31 20:36:54,802 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1370936564] [2023-03-31 20:36:54,802 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:36:54,803 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-03-31 20:36:54,803 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:36:54,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-03-31 20:36:54,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=340, Invalid=920, Unknown=0, NotChecked=0, Total=1260 [2023-03-31 20:36:54,804 INFO L87 Difference]: Start difference. First operand 65 states and 74 transitions. Second operand has 25 states, 25 states have (on average 1.88) internal successors, (47), 25 states have internal predecessors, (47), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:36:54,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:36:54,888 INFO L93 Difference]: Finished difference Result 126 states and 155 transitions. [2023-03-31 20:36:54,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-03-31 20:36:54,889 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.88) internal successors, (47), 25 states have internal predecessors, (47), 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 61 [2023-03-31 20:36:54,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:36:54,889 INFO L225 Difference]: With dead ends: 126 [2023-03-31 20:36:54,889 INFO L226 Difference]: Without dead ends: 77 [2023-03-31 20:36:54,890 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=340, Invalid=920, Unknown=0, NotChecked=0, Total=1260 [2023-03-31 20:36:54,891 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:36:54,891 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 34 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:36:54,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2023-03-31 20:36:54,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2023-03-31 20:36:54,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 71 states have (on average 1.1408450704225352) internal successors, (81), 71 states have internal predecessors, (81), 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) [2023-03-31 20:36:54,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 86 transitions. [2023-03-31 20:36:54,898 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 86 transitions. Word has length 61 [2023-03-31 20:36:54,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:36:54,899 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 86 transitions. [2023-03-31 20:36:54,899 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.88) internal successors, (47), 25 states have internal predecessors, (47), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:36:54,899 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 86 transitions. [2023-03-31 20:36:54,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2023-03-31 20:36:54,900 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:36:54,900 INFO L195 NwaCegarLoop]: trace histogram [22, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:36:54,912 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-03-31 20:36:55,106 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 [2023-03-31 20:36:55,107 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:36:55,107 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:36:55,107 INFO L85 PathProgramCache]: Analyzing trace with hash 689190910, now seen corresponding path program 5 times [2023-03-31 20:36:55,107 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:36:55,107 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [456567456] [2023-03-31 20:36:55,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:36:55,108 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:36:55,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:36:55,963 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2023-03-31 20:36:55,963 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:36:55,964 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [456567456] [2023-03-31 20:36:55,964 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [456567456] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:36:55,964 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [754833663] [2023-03-31 20:36:55,964 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 20:36:55,964 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:36:55,964 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:36:55,967 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) [2023-03-31 20:36:55,968 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-03-31 20:36:56,502 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-03-31 20:36:56,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:36:56,505 INFO L262 TraceCheckSpWp]: Trace formula consists of 537 conjuncts, 6 conjunts are in the unsatisfiable core [2023-03-31 20:36:56,507 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:36:56,574 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 323 trivial. 0 not checked. [2023-03-31 20:36:56,575 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:36:56,659 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 323 trivial. 0 not checked. [2023-03-31 20:36:56,659 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [754833663] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:36:56,659 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1114066977] [2023-03-31 20:36:56,661 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-03-31 20:36:56,661 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:36:56,662 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:36:56,662 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:36:56,662 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:36:56,674 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 20:36:56,926 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-03-31 20:36:56,934 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 20:36:56,938 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:36:57,350 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3110#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_main_~#a9~0.base_BEFORE_CALL_5| Int) (|v_main_~#a1~0.base_BEFORE_CALL_5| Int)) (and (<= 0 |v_main_~#a9~0.base_BEFORE_CALL_5|) (not (= (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_5|) 0) (select (select |#memory_int| |v_main_~#a9~0.base_BEFORE_CALL_5|) 0))) (<= 0 |v_main_~#a1~0.base_BEFORE_CALL_5|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:36:57,350 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:36:57,350 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:36:57,350 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 7, 7] total 35 [2023-03-31 20:36:57,350 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1058301159] [2023-03-31 20:36:57,350 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:36:57,351 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-03-31 20:36:57,351 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:36:57,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-03-31 20:36:57,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=405, Invalid=1665, Unknown=0, NotChecked=0, Total=2070 [2023-03-31 20:36:57,352 INFO L87 Difference]: Start difference. First operand 77 states and 86 transitions. Second operand has 35 states, 35 states have (on average 2.085714285714286) internal successors, (73), 35 states have internal predecessors, (73), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:36:57,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:36:57,585 INFO L93 Difference]: Finished difference Result 175 states and 241 transitions. [2023-03-31 20:36:57,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-03-31 20:36:57,586 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.085714285714286) internal successors, (73), 35 states have internal predecessors, (73), 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 73 [2023-03-31 20:36:57,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:36:57,587 INFO L225 Difference]: With dead ends: 175 [2023-03-31 20:36:57,587 INFO L226 Difference]: Without dead ends: 126 [2023-03-31 20:36:57,588 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 199 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 618 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=405, Invalid=1665, Unknown=0, NotChecked=0, Total=2070 [2023-03-31 20:36:57,588 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 207 mSolverCounterSat, 197 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 404 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 197 IncrementalHoareTripleChecker+Valid, 207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 20:36:57,589 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 80 Invalid, 404 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [197 Valid, 207 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-03-31 20:36:57,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2023-03-31 20:36:57,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2023-03-31 20:36:57,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 120 states have (on average 1.0833333333333333) internal successors, (130), 120 states have internal predecessors, (130), 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) [2023-03-31 20:36:57,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 135 transitions. [2023-03-31 20:36:57,597 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 135 transitions. Word has length 73 [2023-03-31 20:36:57,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:36:57,598 INFO L495 AbstractCegarLoop]: Abstraction has 126 states and 135 transitions. [2023-03-31 20:36:57,598 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.085714285714286) internal successors, (73), 35 states have internal predecessors, (73), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:36:57,598 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 135 transitions. [2023-03-31 20:36:57,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2023-03-31 20:36:57,599 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:36:57,599 INFO L195 NwaCegarLoop]: trace histogram [23, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:36:57,609 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-03-31 20:36:57,808 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 [2023-03-31 20:36:57,808 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:36:57,808 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:36:57,809 INFO L85 PathProgramCache]: Analyzing trace with hash 1385475005, now seen corresponding path program 6 times [2023-03-31 20:36:57,809 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:36:57,809 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1329675435] [2023-03-31 20:36:57,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:36:57,809 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:36:57,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:36:58,785 INFO L134 CoverageAnalysis]: Checked inductivity of 716 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 440 trivial. 0 not checked. [2023-03-31 20:36:58,785 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:36:58,786 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1329675435] [2023-03-31 20:36:58,786 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1329675435] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:36:58,786 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [840573106] [2023-03-31 20:36:58,787 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 20:36:58,787 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:36:58,787 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:36:58,789 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) [2023-03-31 20:36:58,813 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-03-31 20:36:59,151 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 20:36:59,151 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:36:59,158 INFO L262 TraceCheckSpWp]: Trace formula consists of 1196 conjuncts, 25 conjunts are in the unsatisfiable core [2023-03-31 20:36:59,161 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:36:59,201 INFO L134 CoverageAnalysis]: Checked inductivity of 716 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 440 trivial. 0 not checked. [2023-03-31 20:36:59,202 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:36:59,889 INFO L134 CoverageAnalysis]: Checked inductivity of 716 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 440 trivial. 0 not checked. [2023-03-31 20:36:59,890 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [840573106] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:36:59,890 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1572750432] [2023-03-31 20:36:59,892 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-03-31 20:36:59,892 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:36:59,892 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:36:59,892 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:36:59,892 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:36:59,912 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 20:37:00,148 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-03-31 20:37:00,157 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 20:37:00,159 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:37:00,591 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4483#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_main_~#a9~0.base_BEFORE_CALL_6| Int) (|v_main_~#a1~0.base_BEFORE_CALL_6| Int)) (and (<= 0 |v_main_~#a1~0.base_BEFORE_CALL_6|) (<= 0 |v_main_~#a9~0.base_BEFORE_CALL_6|) (not (= (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_6|) 0) (select (select |#memory_int| |v_main_~#a9~0.base_BEFORE_CALL_6|) 0))))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:37:00,592 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:37:00,592 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:37:00,592 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2023-03-31 20:37:00,592 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864971603] [2023-03-31 20:37:00,592 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:37:00,593 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2023-03-31 20:37:00,593 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:37:00,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2023-03-31 20:37:00,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1315, Invalid=2467, Unknown=0, NotChecked=0, Total=3782 [2023-03-31 20:37:00,595 INFO L87 Difference]: Start difference. First operand 126 states and 135 transitions. Second operand has 51 states, 51 states have (on average 1.4313725490196079) internal successors, (73), 51 states have internal predecessors, (73), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:37:00,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:37:00,669 INFO L93 Difference]: Finished difference Result 248 states and 290 transitions. [2023-03-31 20:37:00,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2023-03-31 20:37:00,670 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.4313725490196079) internal successors, (73), 51 states have internal predecessors, (73), 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 122 [2023-03-31 20:37:00,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:37:00,671 INFO L225 Difference]: With dead ends: 248 [2023-03-31 20:37:00,671 INFO L226 Difference]: Without dead ends: 151 [2023-03-31 20:37:00,672 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 331 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 897 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1315, Invalid=2467, Unknown=0, NotChecked=0, Total=3782 [2023-03-31 20:37:00,673 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:37:00,673 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:37:00,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2023-03-31 20:37:00,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2023-03-31 20:37:00,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 145 states have (on average 1.0689655172413792) internal successors, (155), 145 states have internal predecessors, (155), 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) [2023-03-31 20:37:00,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 160 transitions. [2023-03-31 20:37:00,694 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 160 transitions. Word has length 122 [2023-03-31 20:37:00,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:37:00,694 INFO L495 AbstractCegarLoop]: Abstraction has 151 states and 160 transitions. [2023-03-31 20:37:00,694 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.4313725490196079) internal successors, (73), 51 states have internal predecessors, (73), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:37:00,694 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 160 transitions. [2023-03-31 20:37:00,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2023-03-31 20:37:00,697 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:37:00,697 INFO L195 NwaCegarLoop]: trace histogram [48, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:37:00,705 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-03-31 20:37:00,905 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 [2023-03-31 20:37:00,905 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:37:00,905 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:37:00,906 INFO L85 PathProgramCache]: Analyzing trace with hash -154080674, now seen corresponding path program 7 times [2023-03-31 20:37:00,906 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:37:00,906 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1680144550] [2023-03-31 20:37:00,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:37:00,906 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:37:01,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:37:03,596 INFO L134 CoverageAnalysis]: Checked inductivity of 1616 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 440 trivial. 0 not checked. [2023-03-31 20:37:03,597 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:37:03,597 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1680144550] [2023-03-31 20:37:03,597 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1680144550] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:37:03,597 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2112312558] [2023-03-31 20:37:03,597 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 20:37:03,597 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:37:03,597 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:37:03,601 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) [2023-03-31 20:37:03,628 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-03-31 20:37:04,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:37:04,116 INFO L262 TraceCheckSpWp]: Trace formula consists of 1621 conjuncts, 50 conjunts are in the unsatisfiable core [2023-03-31 20:37:04,123 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:37:04,210 INFO L134 CoverageAnalysis]: Checked inductivity of 1616 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 440 trivial. 0 not checked. [2023-03-31 20:37:04,210 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:37:06,578 INFO L134 CoverageAnalysis]: Checked inductivity of 1616 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 440 trivial. 0 not checked. [2023-03-31 20:37:06,578 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2112312558] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:37:06,578 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1211750860] [2023-03-31 20:37:06,580 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-03-31 20:37:06,580 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:37:06,580 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:37:06,580 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:37:06,580 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:37:06,595 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 20:37:06,854 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-03-31 20:37:06,862 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 20:37:06,864 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:37:07,389 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6252#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_main_~#a9~0.base_BEFORE_CALL_7| Int) (|v_main_~#a1~0.base_BEFORE_CALL_7| Int)) (and (<= 0 |v_main_~#a9~0.base_BEFORE_CALL_7|) (<= 0 |v_main_~#a1~0.base_BEFORE_CALL_7|) (not (= (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_7|) 0) (select (select |#memory_int| |v_main_~#a9~0.base_BEFORE_CALL_7|) 0))))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:37:07,389 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:37:07,389 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:37:07,389 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 101 [2023-03-31 20:37:07,390 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875643955] [2023-03-31 20:37:07,390 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:37:07,390 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2023-03-31 20:37:07,390 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:37:07,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2023-03-31 20:37:07,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5090, Invalid=7342, Unknown=0, NotChecked=0, Total=12432 [2023-03-31 20:37:07,395 INFO L87 Difference]: Start difference. First operand 151 states and 160 transitions. Second operand has 101 states, 101 states have (on average 1.2178217821782178) internal successors, (123), 101 states have internal predecessors, (123), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:37:07,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:37:07,574 INFO L93 Difference]: Finished difference Result 298 states and 365 transitions. [2023-03-31 20:37:07,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2023-03-31 20:37:07,575 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.2178217821782178) internal successors, (123), 101 states have internal predecessors, (123), 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 147 [2023-03-31 20:37:07,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:37:07,576 INFO L225 Difference]: With dead ends: 298 [2023-03-31 20:37:07,576 INFO L226 Difference]: Without dead ends: 201 [2023-03-31 20:37:07,579 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 491 GetRequests, 381 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1822 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=5090, Invalid=7342, Unknown=0, NotChecked=0, Total=12432 [2023-03-31 20:37:07,580 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 252 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 253 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:37:07,580 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 89 Invalid, 253 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 252 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:37:07,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2023-03-31 20:37:07,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 201. [2023-03-31 20:37:07,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 195 states have (on average 1.0512820512820513) internal successors, (205), 195 states have internal predecessors, (205), 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) [2023-03-31 20:37:07,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 210 transitions. [2023-03-31 20:37:07,593 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 210 transitions. Word has length 147 [2023-03-31 20:37:07,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:37:07,597 INFO L495 AbstractCegarLoop]: Abstraction has 201 states and 210 transitions. [2023-03-31 20:37:07,597 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 1.2178217821782178) internal successors, (123), 101 states have internal predecessors, (123), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:37:07,597 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 210 transitions. [2023-03-31 20:37:07,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2023-03-31 20:37:07,599 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:37:07,599 INFO L195 NwaCegarLoop]: trace histogram [98, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:37:07,607 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-03-31 20:37:07,799 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-03-31 20:37:07,800 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:37:07,800 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:37:07,800 INFO L85 PathProgramCache]: Analyzing trace with hash -489543874, now seen corresponding path program 8 times [2023-03-31 20:37:07,800 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:37:07,800 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1005354844] [2023-03-31 20:37:07,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:37:07,801 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:37:08,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:37:15,560 INFO L134 CoverageAnalysis]: Checked inductivity of 5291 backedges. 0 proven. 4851 refuted. 0 times theorem prover too weak. 440 trivial. 0 not checked. [2023-03-31 20:37:15,561 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:37:15,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1005354844] [2023-03-31 20:37:15,561 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1005354844] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:37:15,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [105377990] [2023-03-31 20:37:15,561 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 20:37:15,561 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:37:15,561 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:37:15,562 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:37:15,564 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-03-31 20:37:37,404 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-03-31 20:37:37,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:37:37,431 INFO L262 TraceCheckSpWp]: Trace formula consists of 975 conjuncts, 12 conjunts are in the unsatisfiable core [2023-03-31 20:37:37,434 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:37:37,888 INFO L134 CoverageAnalysis]: Checked inductivity of 5291 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 5236 trivial. 0 not checked. [2023-03-31 20:37:37,888 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:37:38,396 INFO L134 CoverageAnalysis]: Checked inductivity of 5291 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 5236 trivial. 0 not checked. [2023-03-31 20:37:38,397 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [105377990] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:37:38,397 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [403639499] [2023-03-31 20:37:38,398 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-03-31 20:37:38,398 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:37:38,399 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:37:38,399 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:37:38,399 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:37:38,409 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 20:37:38,641 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-03-31 20:37:38,650 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 20:37:38,655 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:37:39,513 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8543#(and (exists ((|v_main_~#a9~0.base_BEFORE_CALL_8| Int) (|v_main_~#a1~0.base_BEFORE_CALL_8| Int)) (and (not (= (select (select |#memory_int| |v_main_~#a9~0.base_BEFORE_CALL_8|) 0) (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_8|) 0))) (<= 0 |v_main_~#a1~0.base_BEFORE_CALL_8|) (<= 0 |v_main_~#a9~0.base_BEFORE_CALL_8|))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:37:39,514 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:37:39,514 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:37:39,514 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 13, 13] total 123 [2023-03-31 20:37:39,514 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494854643] [2023-03-31 20:37:39,514 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:37:39,515 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2023-03-31 20:37:39,515 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:37:39,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2023-03-31 20:37:39,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5365, Invalid=12457, Unknown=0, NotChecked=0, Total=17822 [2023-03-31 20:37:39,521 INFO L87 Difference]: Start difference. First operand 201 states and 210 transitions. Second operand has 123 states, 123 states have (on average 1.2276422764227641) internal successors, (151), 123 states have internal predecessors, (151), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:37:40,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:37:40,103 INFO L93 Difference]: Finished difference Result 395 states and 509 transitions. [2023-03-31 20:37:40,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2023-03-31 20:37:40,104 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 1.2276422764227641) internal successors, (151), 123 states have internal predecessors, (151), 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 197 [2023-03-31 20:37:40,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:37:40,105 INFO L225 Difference]: With dead ends: 395 [2023-03-31 20:37:40,105 INFO L226 Difference]: Without dead ends: 298 [2023-03-31 20:37:40,108 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 691 GetRequests, 559 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3588 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=5365, Invalid=12457, Unknown=0, NotChecked=0, Total=17822 [2023-03-31 20:37:40,108 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 402 mSolverCounterSat, 589 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 991 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 589 IncrementalHoareTripleChecker+Valid, 402 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-03-31 20:37:40,108 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 103 Invalid, 991 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [589 Valid, 402 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-03-31 20:37:40,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2023-03-31 20:37:40,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 298. [2023-03-31 20:37:40,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 292 states have (on average 1.0342465753424657) internal successors, (302), 292 states have internal predecessors, (302), 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) [2023-03-31 20:37:40,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 307 transitions. [2023-03-31 20:37:40,120 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 307 transitions. Word has length 197 [2023-03-31 20:37:40,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:37:40,120 INFO L495 AbstractCegarLoop]: Abstraction has 298 states and 307 transitions. [2023-03-31 20:37:40,121 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 1.2276422764227641) internal successors, (151), 123 states have internal predecessors, (151), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:37:40,121 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 307 transitions. [2023-03-31 20:37:40,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2023-03-31 20:37:40,124 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:37:40,124 INFO L195 NwaCegarLoop]: trace histogram [99, 22, 22, 22, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:37:40,147 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-03-31 20:37:40,337 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-03-31 20:37:40,337 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:37:40,337 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:37:40,337 INFO L85 PathProgramCache]: Analyzing trace with hash -1514789763, now seen corresponding path program 9 times [2023-03-31 20:37:40,337 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:37:40,338 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1580954675] [2023-03-31 20:37:40,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:37:40,338 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:37:40,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat