/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/array-cav19/array_min_and_copy_shift_sum_add.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 15:17:03,744 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 15:17:03,746 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 15:17:03,783 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 15:17:03,784 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 15:17:03,786 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 15:17:03,789 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 15:17:03,791 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 15:17:03,793 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 15:17:03,797 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 15:17:03,799 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 15:17:03,800 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 15:17:03,800 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 15:17:03,803 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 15:17:03,804 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 15:17:03,805 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 15:17:03,805 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 15:17:03,806 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 15:17:03,809 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 15:17:03,813 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 15:17:03,815 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 15:17:03,816 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 15:17:03,817 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 15:17:03,818 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 15:17:03,826 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-04-02 15:17:03,829 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 15:17:03,830 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 15:17:03,831 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 15:17:03,832 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 15:17:03,833 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 15:17:03,833 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 15:17:03,833 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 15:17:03,833 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 15:17:03,834 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 15:17:03,834 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 15:17:03,835 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 15:17:03,836 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-02 15:17:03,865 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 15:17:03,865 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 15:17:03,866 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 15:17:03,866 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 15:17:03,867 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 15:17:03,867 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 15:17:03,867 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 15:17:03,867 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 15:17:03,867 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 15:17:03,867 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 15:17:03,868 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 15:17:03,868 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 15:17:03,868 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 15:17:03,868 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 15:17:03,869 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 15:17:03,869 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 15:17:03,869 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 15:17:03,869 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 15:17:03,869 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 15:17:03,870 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 15:17:03,870 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 15:17:03,870 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 15:17:03,870 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 15:17:03,870 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 15:17:03,870 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 15:17:03,870 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 15:17:03,871 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 15:17:03,871 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 15:17:03,871 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 15:17:03,871 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 15:17:03,871 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 15:17:03,871 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 15:17:03,871 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 15:17:03,872 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 15:17:03,872 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 15:17:03,872 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 15:17:03,872 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 15:17:03,872 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 15:17:03,872 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 15:17:03,872 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 15:17:03,872 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 15:17:03,872 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 15:17:04,107 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 15:17:04,126 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 15:17:04,129 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 15:17:04,130 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 15:17:04,131 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 15:17:04,132 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-cav19/array_min_and_copy_shift_sum_add.c [2023-04-02 15:17:05,383 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 15:17:05,552 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 15:17:05,553 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-cav19/array_min_and_copy_shift_sum_add.c [2023-04-02 15:17:05,558 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/633b55f5c/daef5f644c9d43309040b184cd70f5ad/FLAGec41f68a7 [2023-04-02 15:17:05,569 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/633b55f5c/daef5f644c9d43309040b184cd70f5ad [2023-04-02 15:17:05,572 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 15:17:05,573 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 15:17:05,575 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 15:17:05,575 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 15:17:05,578 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 15:17:05,579 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 03:17:05" (1/1) ... [2023-04-02 15:17:05,580 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@11badbca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:17:05, skipping insertion in model container [2023-04-02 15:17:05,580 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 03:17:05" (1/1) ... [2023-04-02 15:17:05,586 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 15:17:05,598 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 15:17:05,713 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-cav19/array_min_and_copy_shift_sum_add.c[423,436] [2023-04-02 15:17:05,728 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 15:17:05,735 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 15:17:05,745 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-cav19/array_min_and_copy_shift_sum_add.c[423,436] [2023-04-02 15:17:05,752 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 15:17:05,763 INFO L208 MainTranslator]: Completed translation [2023-04-02 15:17:05,764 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:17:05 WrapperNode [2023-04-02 15:17:05,764 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 15:17:05,764 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 15:17:05,765 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 15:17:05,765 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 15:17:05,772 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:17:05" (1/1) ... [2023-04-02 15:17:05,772 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:17:05" (1/1) ... [2023-04-02 15:17:05,778 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:17:05" (1/1) ... [2023-04-02 15:17:05,778 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:17:05" (1/1) ... [2023-04-02 15:17:05,784 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:17:05" (1/1) ... [2023-04-02 15:17:05,787 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:17:05" (1/1) ... [2023-04-02 15:17:05,789 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:17:05" (1/1) ... [2023-04-02 15:17:05,790 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:17:05" (1/1) ... [2023-04-02 15:17:05,794 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 15:17:05,795 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 15:17:05,795 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 15:17:05,795 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 15:17:05,796 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:17:05" (1/1) ... [2023-04-02 15:17:05,808 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 15:17:05,822 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:17:05,839 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-02 15:17:05,841 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-02 15:17:05,870 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 15:17:05,871 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 15:17:05,871 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 15:17:05,871 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-02 15:17:05,871 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 15:17:05,871 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 15:17:05,871 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 15:17:05,871 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 15:17:05,872 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 15:17:05,872 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 15:17:05,872 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-02 15:17:05,872 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 15:17:05,872 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 15:17:05,872 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 15:17:05,872 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-02 15:17:05,872 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 15:17:05,872 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 15:17:05,873 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 15:17:05,873 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 15:17:05,873 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 15:17:05,873 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 15:17:05,938 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 15:17:05,941 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 15:17:06,171 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 15:17:06,233 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 15:17:06,233 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-04-02 15:17:06,235 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 03:17:06 BoogieIcfgContainer [2023-04-02 15:17:06,235 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 15:17:06,237 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 15:17:06,237 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 15:17:06,240 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 15:17:06,240 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 03:17:05" (1/3) ... [2023-04-02 15:17:06,240 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@743c910b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 03:17:06, skipping insertion in model container [2023-04-02 15:17:06,240 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:17:05" (2/3) ... [2023-04-02 15:17:06,241 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@743c910b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 03:17:06, skipping insertion in model container [2023-04-02 15:17:06,241 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 03:17:06" (3/3) ... [2023-04-02 15:17:06,242 INFO L112 eAbstractionObserver]: Analyzing ICFG array_min_and_copy_shift_sum_add.c [2023-04-02 15:17:06,257 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 15:17:06,257 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 15:17:06,300 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 15:17:06,306 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;@50b30713, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 15:17:06,306 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 15:17:06,310 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 16 states have internal predecessors, (20), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-02 15:17:06,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-04-02 15:17:06,317 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:17:06,318 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:17:06,319 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:17:06,323 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:17:06,324 INFO L85 PathProgramCache]: Analyzing trace with hash -2139480051, now seen corresponding path program 1 times [2023-04-02 15:17:06,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:17:06,332 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1122415866] [2023-04-02 15:17:06,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:17:06,333 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:17:06,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:17:06,858 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 15:17:06,858 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:17:06,859 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1122415866] [2023-04-02 15:17:06,859 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1122415866] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 15:17:06,859 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 15:17:06,859 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-02 15:17:06,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1963137485] [2023-04-02 15:17:06,863 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 15:17:06,867 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 15:17:06,867 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:17:06,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 15:17:06,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-02 15:17:06,910 INFO L87 Difference]: Start difference. First operand has 27 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 16 states have internal predecessors, (20), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-04-02 15:17:07,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:17:07,013 INFO L93 Difference]: Finished difference Result 43 states and 50 transitions. [2023-04-02 15:17:07,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 15:17:07,015 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 20 [2023-04-02 15:17:07,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:17:07,025 INFO L225 Difference]: With dead ends: 43 [2023-04-02 15:17:07,025 INFO L226 Difference]: Without dead ends: 22 [2023-04-02 15:17:07,027 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-04-02 15:17:07,030 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 10 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:17:07,031 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 65 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:17:07,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-04-02 15:17:07,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-04-02 15:17:07,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 6 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 15:17:07,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2023-04-02 15:17:07,057 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 20 [2023-04-02 15:17:07,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:17:07,058 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2023-04-02 15:17:07,058 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-04-02 15:17:07,058 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2023-04-02 15:17:07,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-02 15:17:07,059 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:17:07,060 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:17:07,060 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 15:17:07,060 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:17:07,061 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:17:07,061 INFO L85 PathProgramCache]: Analyzing trace with hash 2041466675, now seen corresponding path program 1 times [2023-04-02 15:17:07,061 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:17:07,061 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [210479156] [2023-04-02 15:17:07,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:17:07,062 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:17:07,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:17:07,179 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 15:17:07,180 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:17:07,180 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [210479156] [2023-04-02 15:17:07,180 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [210479156] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 15:17:07,180 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 15:17:07,180 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-02 15:17:07,181 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702726317] [2023-04-02 15:17:07,181 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 15:17:07,182 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 15:17:07,182 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:17:07,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 15:17:07,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-04-02 15:17:07,183 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-04-02 15:17:07,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:17:07,257 INFO L93 Difference]: Finished difference Result 36 states and 45 transitions. [2023-04-02 15:17:07,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-02 15:17:07,257 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 21 [2023-04-02 15:17:07,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:17:07,258 INFO L225 Difference]: With dead ends: 36 [2023-04-02 15:17:07,258 INFO L226 Difference]: Without dead ends: 26 [2023-04-02 15:17:07,259 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-04-02 15:17:07,260 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 1 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:17:07,260 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 54 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:17:07,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-04-02 15:17:07,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2023-04-02 15:17:07,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 6 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 15:17:07,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2023-04-02 15:17:07,267 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 21 [2023-04-02 15:17:07,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:17:07,267 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2023-04-02 15:17:07,267 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-04-02 15:17:07,267 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2023-04-02 15:17:07,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-04-02 15:17:07,268 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:17:07,268 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:17:07,269 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-02 15:17:07,269 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:17:07,269 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:17:07,269 INFO L85 PathProgramCache]: Analyzing trace with hash 573037210, now seen corresponding path program 1 times [2023-04-02 15:17:07,270 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:17:07,270 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [644041878] [2023-04-02 15:17:07,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:17:07,270 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:17:07,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:17:08,022 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 15:17:08,023 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:17:08,023 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [644041878] [2023-04-02 15:17:08,023 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [644041878] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:17:08,025 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1065389899] [2023-04-02 15:17:08,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:17:08,025 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:17:08,026 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:17:08,029 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:17:08,031 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-02 15:17:08,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:17:08,112 INFO L262 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 22 conjunts are in the unsatisfiable core [2023-04-02 15:17:08,119 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:17:08,311 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 15:17:08,364 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2023-04-02 15:17:08,394 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 15:17:08,394 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:17:10,545 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 15:17:10,546 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 56 treesize of output 36 [2023-04-02 15:17:10,613 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 15:17:10,614 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1065389899] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:17:10,614 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [851445185] [2023-04-02 15:17:10,631 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-04-02 15:17:10,631 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:17:10,634 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:17:10,639 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:17:10,639 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:17:10,696 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:17:11,946 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-04-02 15:17:11,950 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:17:11,951 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:17:11,956 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:17:12,920 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '419#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 15:17:12,920 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:17:12,920 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:17:12,920 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 23 [2023-04-02 15:17:12,921 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1545913802] [2023-04-02 15:17:12,921 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:17:12,921 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-04-02 15:17:12,921 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:17:12,922 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-04-02 15:17:12,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1390, Unknown=1, NotChecked=0, Total=1560 [2023-04-02 15:17:12,925 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 23 states, 23 states have (on average 1.391304347826087) internal successors, (32), 21 states have internal predecessors, (32), 6 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2023-04-02 15:17:13,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:17:13,182 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2023-04-02 15:17:13,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-02 15:17:13,183 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.391304347826087) internal successors, (32), 21 states have internal predecessors, (32), 6 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) Word has length 27 [2023-04-02 15:17:13,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:17:13,184 INFO L225 Difference]: With dead ends: 34 [2023-04-02 15:17:13,184 INFO L226 Difference]: Without dead ends: 29 [2023-04-02 15:17:13,185 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 694 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=186, Invalid=1535, Unknown=1, NotChecked=0, Total=1722 [2023-04-02 15:17:13,186 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 9 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 15:17:13,186 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 151 Invalid, 223 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 217 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 15:17:13,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-04-02 15:17:13,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2023-04-02 15:17:13,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 17 states have internal predecessors, (21), 6 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 15:17:13,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2023-04-02 15:17:13,192 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 27 [2023-04-02 15:17:13,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:17:13,193 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2023-04-02 15:17:13,193 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.391304347826087) internal successors, (32), 21 states have internal predecessors, (32), 6 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2023-04-02 15:17:13,193 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2023-04-02 15:17:13,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-04-02 15:17:13,194 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:17:13,194 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:17:13,205 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-04-02 15:17:13,401 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:17:13,402 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:17:13,402 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:17:13,402 INFO L85 PathProgramCache]: Analyzing trace with hash 230155846, now seen corresponding path program 2 times [2023-04-02 15:17:13,402 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:17:13,403 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [804253645] [2023-04-02 15:17:13,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:17:13,403 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:17:13,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:17:13,490 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-04-02 15:17:13,491 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:17:13,491 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [804253645] [2023-04-02 15:17:13,492 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [804253645] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:17:13,492 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [220563156] [2023-04-02 15:17:13,492 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:17:13,492 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:17:13,492 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:17:13,493 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:17:13,520 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-02 15:17:13,565 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-02 15:17:13,565 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:17:13,566 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-02 15:17:13,569 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:17:13,607 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-04-02 15:17:13,607 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:17:13,648 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-04-02 15:17:13,648 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [220563156] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:17:13,650 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [864175757] [2023-04-02 15:17:13,660 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-04-02 15:17:13,661 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:17:13,661 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:17:13,662 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:17:13,662 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:17:13,682 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:17:14,187 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-04-02 15:17:14,191 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 1 for LOIs [2023-04-02 15:17:14,193 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:17:14,198 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:17:14,522 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '716#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 15:17:14,522 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:17:14,522 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:17:14,522 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 11 [2023-04-02 15:17:14,522 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [349919488] [2023-04-02 15:17:14,523 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:17:14,523 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-02 15:17:14,523 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:17:14,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-02 15:17:14,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=613, Unknown=0, NotChecked=0, Total=702 [2023-04-02 15:17:14,524 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 11 states have internal predecessors, (24), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2023-04-02 15:17:14,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:17:14,605 INFO L93 Difference]: Finished difference Result 44 states and 55 transitions. [2023-04-02 15:17:14,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-02 15:17:14,606 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 11 states have internal predecessors, (24), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 28 [2023-04-02 15:17:14,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:17:14,606 INFO L225 Difference]: With dead ends: 44 [2023-04-02 15:17:14,606 INFO L226 Difference]: Without dead ends: 32 [2023-04-02 15:17:14,607 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=106, Invalid=706, Unknown=0, NotChecked=0, Total=812 [2023-04-02 15:17:14,608 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 2 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 15:17:14,608 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 67 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 15:17:14,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-04-02 15:17:14,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 28. [2023-04-02 15:17:14,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 7 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-02 15:17:14,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2023-04-02 15:17:14,614 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 28 [2023-04-02 15:17:14,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:17:14,614 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2023-04-02 15:17:14,615 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 11 states have internal predecessors, (24), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2023-04-02 15:17:14,615 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2023-04-02 15:17:14,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-04-02 15:17:14,616 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:17:14,616 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:17:14,627 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-02 15:17:14,827 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,SelfDestructingSolverStorable3 [2023-04-02 15:17:14,827 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:17:14,828 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:17:14,828 INFO L85 PathProgramCache]: Analyzing trace with hash 229449299, now seen corresponding path program 3 times [2023-04-02 15:17:14,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:17:14,828 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193734484] [2023-04-02 15:17:14,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:17:14,828 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:17:14,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:17:14,915 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-02 15:17:14,915 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:17:14,915 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193734484] [2023-04-02 15:17:14,916 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [193734484] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:17:14,916 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [512796803] [2023-04-02 15:17:14,916 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:17:14,916 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:17:14,916 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:17:14,917 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:17:14,940 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-02 15:17:14,973 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:17:14,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:17:14,974 INFO L262 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-02 15:17:14,976 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:17:15,008 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-04-02 15:17:15,008 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:17:15,056 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-04-02 15:17:15,056 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [512796803] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:17:15,056 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2065550579] [2023-04-02 15:17:15,060 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-04-02 15:17:15,060 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:17:15,061 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:17:15,061 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:17:15,061 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:17:15,079 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:17:15,831 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-04-02 15:17:15,834 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:17:15,836 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:17:15,840 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:17:16,562 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1064#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 15:17:16,563 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:17:16,563 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:17:16,563 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 11 [2023-04-02 15:17:16,563 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721944398] [2023-04-02 15:17:16,563 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:17:16,564 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-02 15:17:16,564 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:17:16,564 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-02 15:17:16,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=610, Unknown=0, NotChecked=0, Total=702 [2023-04-02 15:17:16,565 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2023-04-02 15:17:16,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:17:16,673 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2023-04-02 15:17:16,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-02 15:17:16,674 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 33 [2023-04-02 15:17:16,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:17:16,675 INFO L225 Difference]: With dead ends: 34 [2023-04-02 15:17:16,675 INFO L226 Difference]: Without dead ends: 29 [2023-04-02 15:17:16,676 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 77 SyntacticMatches, 4 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 284 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=119, Invalid=811, Unknown=0, NotChecked=0, Total=930 [2023-04-02 15:17:16,676 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 5 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:17:16,677 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 109 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:17:16,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-04-02 15:17:16,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2023-04-02 15:17:16,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 7 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-02 15:17:16,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 34 transitions. [2023-04-02 15:17:16,682 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 34 transitions. Word has length 33 [2023-04-02 15:17:16,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:17:16,683 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 34 transitions. [2023-04-02 15:17:16,683 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2023-04-02 15:17:16,683 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 34 transitions. [2023-04-02 15:17:16,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-04-02 15:17:16,684 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:17:16,684 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:17:16,691 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-02 15:17:16,889 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:17:16,889 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:17:16,889 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:17:16,889 INFO L85 PathProgramCache]: Analyzing trace with hash -1831134803, now seen corresponding path program 4 times [2023-04-02 15:17:16,890 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:17:16,890 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2128962775] [2023-04-02 15:17:16,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:17:16,890 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:17:16,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:17:18,020 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 1 proven. 13 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-02 15:17:18,020 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:17:18,020 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2128962775] [2023-04-02 15:17:18,021 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2128962775] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:17:18,021 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1577277082] [2023-04-02 15:17:18,021 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:17:18,021 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:17:18,021 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:17:18,022 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:17:18,023 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-02 15:17:18,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:17:18,093 INFO L262 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 44 conjunts are in the unsatisfiable core [2023-04-02 15:17:18,099 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:17:18,128 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-04-02 15:17:18,342 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 33 [2023-04-02 15:17:18,405 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 42 [2023-04-02 15:17:18,604 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 63 treesize of output 23 [2023-04-02 15:17:18,649 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-02 15:17:18,649 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:17:24,167 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1577277082] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:17:24,168 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1492343043] [2023-04-02 15:17:24,170 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-04-02 15:17:24,170 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:17:24,170 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:17:24,170 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:17:24,170 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:17:24,202 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:17:24,592 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-04-02 15:17:24,595 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 1 for LOIs [2023-04-02 15:17:24,596 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:17:24,603 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:17:25,284 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1366#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 15:17:25,285 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:17:25,285 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:17:25,285 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 27 [2023-04-02 15:17:25,285 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156743967] [2023-04-02 15:17:25,285 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:17:25,286 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-04-02 15:17:25,286 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:17:25,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-04-02 15:17:25,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=2255, Unknown=2, NotChecked=0, Total=2450 [2023-04-02 15:17:25,288 INFO L87 Difference]: Start difference. First operand 29 states and 34 transitions. Second operand has 27 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 states have internal predecessors, (34), 8 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2023-04-02 15:17:27,847 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:17:28,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:17:28,241 INFO L93 Difference]: Finished difference Result 49 states and 60 transitions. [2023-04-02 15:17:28,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-04-02 15:17:28,242 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 states have internal predecessors, (34), 8 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) Word has length 34 [2023-04-02 15:17:28,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:17:28,243 INFO L225 Difference]: With dead ends: 49 [2023-04-02 15:17:28,243 INFO L226 Difference]: Without dead ends: 43 [2023-04-02 15:17:28,245 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1151 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=392, Invalid=3638, Unknown=2, NotChecked=0, Total=4032 [2023-04-02 15:17:28,246 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 15 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 383 mSolverCounterSat, 37 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 421 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 383 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2023-04-02 15:17:28,246 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 111 Invalid, 421 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 383 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2023-04-02 15:17:28,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2023-04-02 15:17:28,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 32. [2023-04-02 15:17:28,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 7 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-02 15:17:28,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2023-04-02 15:17:28,254 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 34 [2023-04-02 15:17:28,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:17:28,254 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2023-04-02 15:17:28,254 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 states have internal predecessors, (34), 8 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2023-04-02 15:17:28,255 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2023-04-02 15:17:28,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-04-02 15:17:28,255 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:17:28,255 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:17:28,265 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-02 15:17:28,461 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:17:28,461 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:17:28,461 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:17:28,462 INFO L85 PathProgramCache]: Analyzing trace with hash -1284732525, now seen corresponding path program 5 times [2023-04-02 15:17:28,462 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:17:28,462 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [506507528] [2023-04-02 15:17:28,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:17:28,462 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:17:28,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:17:28,582 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-02 15:17:28,582 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:17:28,582 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [506507528] [2023-04-02 15:17:28,583 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [506507528] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:17:28,583 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [518403782] [2023-04-02 15:17:28,583 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:17:28,583 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:17:28,583 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:17:28,584 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:17:28,608 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-02 15:17:28,650 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-02 15:17:28,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:17:28,651 INFO L262 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-02 15:17:28,657 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:17:28,709 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-04-02 15:17:28,709 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:17:28,755 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-04-02 15:17:28,755 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [518403782] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:17:28,755 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [961063856] [2023-04-02 15:17:28,758 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-04-02 15:17:28,758 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:17:28,758 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:17:28,758 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:17:28,758 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:17:28,773 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:17:29,463 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-04-02 15:17:29,466 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:17:29,467 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:17:29,470 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:17:30,113 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1770#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 15:17:30,113 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:17:30,114 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:17:30,114 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 14 [2023-04-02 15:17:30,114 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165211573] [2023-04-02 15:17:30,114 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:17:30,114 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-02 15:17:30,114 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:17:30,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-02 15:17:30,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=811, Unknown=0, NotChecked=0, Total=930 [2023-04-02 15:17:30,116 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2023-04-02 15:17:30,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:17:30,222 INFO L93 Difference]: Finished difference Result 58 states and 72 transitions. [2023-04-02 15:17:30,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-02 15:17:30,222 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 35 [2023-04-02 15:17:30,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:17:30,223 INFO L225 Difference]: With dead ends: 58 [2023-04-02 15:17:30,223 INFO L226 Difference]: Without dead ends: 41 [2023-04-02 15:17:30,224 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 80 SyntacticMatches, 4 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=149, Invalid=973, Unknown=0, NotChecked=0, Total=1122 [2023-04-02 15:17:30,224 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 2 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:17:30,224 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 70 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:17:30,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-04-02 15:17:30,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 35. [2023-04-02 15:17:30,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 24 states have internal predecessors, (28), 8 states have call successors, (8), 4 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-02 15:17:30,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2023-04-02 15:17:30,232 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 35 [2023-04-02 15:17:30,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:17:30,232 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2023-04-02 15:17:30,232 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2023-04-02 15:17:30,233 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2023-04-02 15:17:30,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-04-02 15:17:30,233 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:17:30,233 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:17:30,241 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-02 15:17:30,441 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:17:30,441 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:17:30,442 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:17:30,442 INFO L85 PathProgramCache]: Analyzing trace with hash 670540154, now seen corresponding path program 6 times [2023-04-02 15:17:30,442 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:17:30,442 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [366581264] [2023-04-02 15:17:30,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:17:30,442 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:17:30,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:17:32,218 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 15:17:32,218 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:17:32,219 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [366581264] [2023-04-02 15:17:32,219 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [366581264] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:17:32,219 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [365259734] [2023-04-02 15:17:32,219 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:17:32,219 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:17:32,219 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:17:32,222 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:17:32,225 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-02 15:17:32,312 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:17:32,312 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:17:32,314 INFO L262 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 55 conjunts are in the unsatisfiable core [2023-04-02 15:17:32,319 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:17:32,345 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-04-02 15:17:32,737 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 43 [2023-04-02 15:17:32,807 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 55 treesize of output 55 [2023-04-02 15:17:32,879 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 4 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 120 treesize of output 79 [2023-04-02 15:17:33,208 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 4 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 143 treesize of output 47 [2023-04-02 15:17:33,269 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 3 proven. 25 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-04-02 15:17:33,269 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:17:34,186 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [365259734] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:17:34,186 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2119116127] [2023-04-02 15:17:34,188 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-04-02 15:17:34,188 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:17:34,189 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:17:34,189 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:17:34,189 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:17:34,207 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:17:34,788 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-04-02 15:17:34,795 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:17:34,796 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:17:34,799 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:17:35,949 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2162#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 15:17:35,950 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:17:35,950 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:17:35,950 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 33 [2023-04-02 15:17:35,950 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530670856] [2023-04-02 15:17:35,950 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:17:35,951 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2023-04-02 15:17:35,951 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:17:35,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2023-04-02 15:17:35,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=3180, Unknown=0, NotChecked=0, Total=3422 [2023-04-02 15:17:35,952 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 33 states, 32 states have (on average 1.3125) internal successors, (42), 31 states have internal predecessors, (42), 10 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2023-04-02 15:17:38,959 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:17:39,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:17:39,560 INFO L93 Difference]: Finished difference Result 52 states and 63 transitions. [2023-04-02 15:17:39,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-04-02 15:17:39,561 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 1.3125) internal successors, (42), 31 states have internal predecessors, (42), 10 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) Word has length 41 [2023-04-02 15:17:39,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:17:39,561 INFO L225 Difference]: With dead ends: 52 [2023-04-02 15:17:39,561 INFO L226 Difference]: Without dead ends: 46 [2023-04-02 15:17:39,563 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1622 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=505, Invalid=5347, Unknown=0, NotChecked=0, Total=5852 [2023-04-02 15:17:39,563 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 22 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 675 mSolverCounterSat, 54 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 730 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 675 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2023-04-02 15:17:39,564 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 168 Invalid, 730 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 675 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2023-04-02 15:17:39,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-04-02 15:17:39,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 40. [2023-04-02 15:17:39,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 29 states have (on average 1.206896551724138) internal successors, (35), 29 states have internal predecessors, (35), 8 states have call successors, (8), 4 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-02 15:17:39,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 49 transitions. [2023-04-02 15:17:39,574 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 49 transitions. Word has length 41 [2023-04-02 15:17:39,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:17:39,574 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 49 transitions. [2023-04-02 15:17:39,575 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 1.3125) internal successors, (42), 31 states have internal predecessors, (42), 10 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2023-04-02 15:17:39,575 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 49 transitions. [2023-04-02 15:17:39,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-04-02 15:17:39,575 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:17:39,576 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:17:39,582 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-04-02 15:17:39,785 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:17:39,785 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:17:39,785 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:17:39,786 INFO L85 PathProgramCache]: Analyzing trace with hash 1575557946, now seen corresponding path program 7 times [2023-04-02 15:17:39,786 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:17:39,786 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576313213] [2023-04-02 15:17:39,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:17:39,786 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:17:39,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:17:39,916 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 1 proven. 14 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-04-02 15:17:39,917 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:17:39,917 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [576313213] [2023-04-02 15:17:39,917 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [576313213] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:17:39,917 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1038952434] [2023-04-02 15:17:39,917 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:17:39,917 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:17:39,917 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:17:39,921 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:17:39,946 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-02 15:17:39,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:17:39,996 INFO L262 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-02 15:17:39,998 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:17:40,117 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 10 proven. 12 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-04-02 15:17:40,118 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:17:40,224 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 10 proven. 12 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-04-02 15:17:40,225 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1038952434] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:17:40,225 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1435464806] [2023-04-02 15:17:40,226 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-04-02 15:17:40,226 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:17:40,227 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:17:40,227 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:17:40,227 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:17:40,243 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:17:41,026 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-04-02 15:17:41,029 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:17:41,030 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:17:41,033 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:17:41,881 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2639#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 15:17:41,882 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:17:41,882 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:17:41,882 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 21 [2023-04-02 15:17:41,882 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689690329] [2023-04-02 15:17:41,882 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:17:41,882 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-04-02 15:17:41,883 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:17:41,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-04-02 15:17:41,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1248, Unknown=0, NotChecked=0, Total=1406 [2023-04-02 15:17:41,884 INFO L87 Difference]: Start difference. First operand 40 states and 49 transitions. Second operand has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 21 states have internal predecessors, (40), 8 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2023-04-02 15:17:42,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:17:42,255 INFO L93 Difference]: Finished difference Result 68 states and 86 transitions. [2023-04-02 15:17:42,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-04-02 15:17:42,255 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 21 states have internal predecessors, (40), 8 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) Word has length 41 [2023-04-02 15:17:42,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:17:42,256 INFO L225 Difference]: With dead ends: 68 [2023-04-02 15:17:42,256 INFO L226 Difference]: Without dead ends: 47 [2023-04-02 15:17:42,257 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 91 SyntacticMatches, 4 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 781 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=334, Invalid=2422, Unknown=0, NotChecked=0, Total=2756 [2023-04-02 15:17:42,258 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 15 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:17:42,258 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 126 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:17:42,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2023-04-02 15:17:42,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2023-04-02 15:17:42,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 28 states have internal predecessors, (32), 9 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-02 15:17:42,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2023-04-02 15:17:42,270 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 41 [2023-04-02 15:17:42,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:17:42,270 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2023-04-02 15:17:42,270 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 21 states have internal predecessors, (40), 8 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2023-04-02 15:17:42,271 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2023-04-02 15:17:42,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-04-02 15:17:42,271 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:17:42,271 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:17:42,285 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-04-02 15:17:42,481 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:17:42,481 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:17:42,481 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:17:42,482 INFO L85 PathProgramCache]: Analyzing trace with hash 587172685, now seen corresponding path program 8 times [2023-04-02 15:17:42,482 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:17:42,482 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [984930449] [2023-04-02 15:17:42,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:17:42,482 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:17:42,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:17:45,760 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 1 proven. 46 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-04-02 15:17:45,760 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:17:45,761 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [984930449] [2023-04-02 15:17:45,761 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [984930449] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:17:45,761 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1177276594] [2023-04-02 15:17:45,761 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:17:45,761 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:17:45,761 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:17:45,762 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:17:45,764 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-02 15:17:45,894 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-04-02 15:17:45,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:17:45,896 INFO L262 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 69 conjunts are in the unsatisfiable core [2023-04-02 15:17:45,899 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:17:45,930 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-04-02 15:17:46,500 INFO L321 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2023-04-02 15:17:46,500 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 59 treesize of output 63 [2023-04-02 15:17:46,623 INFO L321 Elim1Store]: treesize reduction 48, result has 2.0 percent of original size [2023-04-02 15:17:46,623 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 5 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 72 treesize of output 82 [2023-04-02 15:17:46,757 INFO L321 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2023-04-02 15:17:46,758 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 7 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 9 case distinctions, treesize of input 85 treesize of output 101 [2023-04-02 15:17:46,909 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:17:46,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:17:46,913 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:17:46,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:17:46,917 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:17:46,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:17:46,928 INFO L321 Elim1Store]: treesize reduction 48, result has 2.0 percent of original size [2023-04-02 15:17:46,929 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 16 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 6 case distinctions, treesize of input 298 treesize of output 166 [2023-04-02 15:17:47,741 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 15:17:47,742 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:17:47,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:17:47,747 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 15:17:47,748 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 15:17:47,766 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 15:17:47,766 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 9 disjoint index pairs (out of 66 index pairs), introduced 9 new quantified variables, introduced 4 case distinctions, treesize of input 330 treesize of output 114 [2023-04-02 15:17:48,086 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 13 proven. 34 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-04-02 15:17:48,087 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:17:50,601 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1177276594] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:17:50,601 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [282054920] [2023-04-02 15:17:50,602 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-04-02 15:17:50,602 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:17:50,603 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:17:50,603 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:17:50,603 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:17:50,620 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:17:51,083 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-04-02 15:17:51,085 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:17:51,089 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:17:51,092 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:17:52,697 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3122#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 15:17:52,698 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:17:52,698 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:17:52,698 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 42 [2023-04-02 15:17:52,698 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183593597] [2023-04-02 15:17:52,698 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:17:52,699 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2023-04-02 15:17:52,699 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:17:52,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2023-04-02 15:17:52,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=385, Invalid=4585, Unknown=0, NotChecked=0, Total=4970 [2023-04-02 15:17:52,702 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 42 states, 41 states have (on average 1.2439024390243902) internal successors, (51), 40 states have internal predecessors, (51), 12 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2023-04-02 15:17:56,923 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:17:58,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:17:58,548 INFO L93 Difference]: Finished difference Result 53 states and 63 transitions. [2023-04-02 15:17:58,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2023-04-02 15:17:58,549 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 1.2439024390243902) internal successors, (51), 40 states have internal predecessors, (51), 12 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) Word has length 48 [2023-04-02 15:17:58,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:17:58,549 INFO L225 Difference]: With dead ends: 53 [2023-04-02 15:17:58,549 INFO L226 Difference]: Without dead ends: 47 [2023-04-02 15:17:58,551 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2149 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=779, Invalid=8151, Unknown=0, NotChecked=0, Total=8930 [2023-04-02 15:17:58,552 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 29 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 1263 mSolverCounterSat, 52 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 256 SdHoareTripleChecker+Invalid, 1316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 1263 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2023-04-02 15:17:58,552 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 256 Invalid, 1316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 1263 Invalid, 1 Unknown, 0 Unchecked, 3.0s Time] [2023-04-02 15:17:58,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2023-04-02 15:17:58,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 42. [2023-04-02 15:17:58,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 30 states have internal predecessors, (34), 9 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-02 15:17:58,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2023-04-02 15:17:58,568 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 48 [2023-04-02 15:17:58,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:17:58,568 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2023-04-02 15:17:58,569 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 41 states have (on average 1.2439024390243902) internal successors, (51), 40 states have internal predecessors, (51), 12 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2023-04-02 15:17:58,569 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2023-04-02 15:17:58,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-04-02 15:17:58,569 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:17:58,569 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:17:58,577 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-04-02 15:17:58,771 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,SelfDestructingSolverStorable9 [2023-04-02 15:17:58,772 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:17:58,772 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:17:58,772 INFO L85 PathProgramCache]: Analyzing trace with hash -1422046835, now seen corresponding path program 9 times [2023-04-02 15:17:58,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:17:58,772 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [646321977] [2023-04-02 15:17:58,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:17:58,773 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:17:58,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:17:58,955 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 5 proven. 23 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-04-02 15:17:58,955 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:17:58,955 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [646321977] [2023-04-02 15:17:58,956 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [646321977] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:17:58,956 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1819440183] [2023-04-02 15:17:58,956 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:17:58,956 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:17:58,956 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:17:58,957 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) [2023-04-02 15:17:58,960 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-04-02 15:17:59,070 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:17:59,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:17:59,071 INFO L262 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 11 conjunts are in the unsatisfiable core [2023-04-02 15:17:59,072 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:17:59,146 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2023-04-02 15:17:59,146 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:17:59,230 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2023-04-02 15:17:59,231 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1819440183] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:17:59,231 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1668809035] [2023-04-02 15:17:59,232 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-04-02 15:17:59,232 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:17:59,232 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:17:59,233 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:17:59,233 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:17:59,246 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:17:59,677 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-04-02 15:17:59,680 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:17:59,681 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:17:59,683 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:18:00,302 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3656#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 15:18:00,302 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:18:00,302 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:18:00,303 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 12] total 20 [2023-04-02 15:18:00,303 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884175587] [2023-04-02 15:18:00,303 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:18:00,303 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-02 15:18:00,303 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:18:00,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-02 15:18:00,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=1103, Unknown=0, NotChecked=0, Total=1260 [2023-04-02 15:18:00,304 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 20 states, 20 states have (on average 2.1) internal successors, (42), 20 states have internal predecessors, (42), 6 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2023-04-02 15:18:00,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:18:00,589 INFO L93 Difference]: Finished difference Result 67 states and 80 transitions. [2023-04-02 15:18:00,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-04-02 15:18:00,590 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.1) internal successors, (42), 20 states have internal predecessors, (42), 6 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 48 [2023-04-02 15:18:00,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:18:00,590 INFO L225 Difference]: With dead ends: 67 [2023-04-02 15:18:00,590 INFO L226 Difference]: Without dead ends: 55 [2023-04-02 15:18:00,591 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 116 SyntacticMatches, 8 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 828 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=312, Invalid=2040, Unknown=0, NotChecked=0, Total=2352 [2023-04-02 15:18:00,592 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 15 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 252 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:18:00,592 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 121 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 252 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:18:00,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2023-04-02 15:18:00,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 50. [2023-04-02 15:18:00,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 37 states have (on average 1.135135135135135) internal successors, (42), 37 states have internal predecessors, (42), 10 states have call successors, (10), 4 states have call predecessors, (10), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-04-02 15:18:00,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2023-04-02 15:18:00,617 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 48 [2023-04-02 15:18:00,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:18:00,617 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2023-04-02 15:18:00,617 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.1) internal successors, (42), 20 states have internal predecessors, (42), 6 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2023-04-02 15:18:00,618 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2023-04-02 15:18:00,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-04-02 15:18:00,618 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:18:00,618 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:18:00,626 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-04-02 15:18:00,821 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:18:00,821 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:18:00,821 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:18:00,821 INFO L85 PathProgramCache]: Analyzing trace with hash -1109942259, now seen corresponding path program 10 times [2023-04-02 15:18:00,821 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:18:00,822 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1410173827] [2023-04-02 15:18:00,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:18:00,822 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:18:00,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:18:00,981 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 16 proven. 27 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-04-02 15:18:00,982 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:18:00,982 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1410173827] [2023-04-02 15:18:00,982 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1410173827] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:18:00,982 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1123972857] [2023-04-02 15:18:00,982 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:18:00,982 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:18:00,982 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:18:00,985 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:18:01,012 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-04-02 15:18:01,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:18:01,074 INFO L262 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-02 15:18:01,076 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:18:01,184 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 20 proven. 22 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-04-02 15:18:01,184 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:18:01,283 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 20 proven. 22 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-04-02 15:18:01,283 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1123972857] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:18:01,284 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [275878046] [2023-04-02 15:18:01,285 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-04-02 15:18:01,285 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:18:01,285 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:18:01,285 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:18:01,286 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:18:01,301 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:18:01,617 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-04-02 15:18:01,620 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 1 for LOIs [2023-04-02 15:18:01,620 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:18:01,622 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:18:01,983 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4227#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 15:18:01,983 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:18:01,984 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:18:01,984 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 21 [2023-04-02 15:18:01,984 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [515112612] [2023-04-02 15:18:01,984 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:18:01,984 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-04-02 15:18:01,984 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:18:01,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-04-02 15:18:01,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=1164, Unknown=0, NotChecked=0, Total=1332 [2023-04-02 15:18:01,985 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 7 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2023-04-02 15:18:02,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:18:02,184 INFO L93 Difference]: Finished difference Result 68 states and 80 transitions. [2023-04-02 15:18:02,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-02 15:18:02,184 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 7 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 50 [2023-04-02 15:18:02,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:18:02,185 INFO L225 Difference]: With dead ends: 68 [2023-04-02 15:18:02,185 INFO L226 Difference]: Without dead ends: 46 [2023-04-02 15:18:02,186 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 119 SyntacticMatches, 9 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 632 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=223, Invalid=1417, Unknown=0, NotChecked=0, Total=1640 [2023-04-02 15:18:02,186 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 1 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 185 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 185 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:18:02,186 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 137 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 185 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:18:02,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-04-02 15:18:02,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2023-04-02 15:18:02,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 31 states have (on average 1.096774193548387) internal successors, (34), 31 states have internal predecessors, (34), 10 states have call successors, (10), 4 states have call predecessors, (10), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-04-02 15:18:02,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2023-04-02 15:18:02,204 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 50 [2023-04-02 15:18:02,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:18:02,205 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2023-04-02 15:18:02,205 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 7 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2023-04-02 15:18:02,205 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2023-04-02 15:18:02,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2023-04-02 15:18:02,206 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:18:02,206 INFO L195 NwaCegarLoop]: trace histogram [7, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:18:02,215 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-04-02 15:18:02,412 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-04-02 15:18:02,412 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:18:02,413 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:18:02,413 INFO L85 PathProgramCache]: Analyzing trace with hash -2119258022, now seen corresponding path program 11 times [2023-04-02 15:18:02,413 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:18:02,413 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [167092384] [2023-04-02 15:18:02,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:18:02,413 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:18:02,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:18:22,326 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-04-02 15:18:22,326 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:18:22,326 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [167092384] [2023-04-02 15:18:22,326 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [167092384] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:18:22,326 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1725653128] [2023-04-02 15:18:22,326 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:18:22,326 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:18:22,326 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:18:22,327 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:18:22,329 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-04-02 15:18:22,438 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-04-02 15:18:22,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:18:22,441 INFO L262 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 79 conjunts are in the unsatisfiable core [2023-04-02 15:18:22,444 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:18:22,452 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-04-02 15:18:23,167 INFO L321 Elim1Store]: treesize reduction 32, result has 3.0 percent of original size [2023-04-02 15:18:23,167 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 70 treesize of output 77 [2023-04-02 15:18:23,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:18:23,266 INFO L321 Elim1Store]: treesize reduction 56, result has 1.8 percent of original size [2023-04-02 15:18:23,266 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 9 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 7 case distinctions, treesize of input 85 treesize of output 98 [2023-04-02 15:18:23,355 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:18:23,371 INFO L321 Elim1Store]: treesize reduction 88, result has 1.1 percent of original size [2023-04-02 15:18:23,371 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 11 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 12 case distinctions, treesize of input 100 treesize of output 119 [2023-04-02 15:18:23,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:18:23,499 INFO L321 Elim1Store]: treesize reduction 120, result has 0.8 percent of original size [2023-04-02 15:18:23,500 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 11 select indices, 11 select index equivalence classes, 14 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 18 case distinctions, treesize of input 115 treesize of output 140 [2023-04-02 15:18:23,623 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:18:23,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:18:23,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:18:23,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:18:23,630 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:18:23,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:18:23,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:18:23,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:18:23,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:18:23,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:18:23,647 INFO L321 Elim1Store]: treesize reduction 80, result has 1.2 percent of original size [2023-04-02 15:18:23,647 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 13 select indices, 13 select index equivalence classes, 27 disjoint index pairs (out of 78 index pairs), introduced 13 new quantified variables, introduced 16 case distinctions, treesize of input 509 treesize of output 244 [2023-04-02 15:18:25,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:18:25,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:18:25,171 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 15:18:25,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:18:25,173 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:18:25,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:18:25,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:18:25,176 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 15:18:25,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:18:25,177 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:18:25,177 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 15:18:25,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:18:25,179 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 15:18:25,250 INFO L321 Elim1Store]: treesize reduction 8, result has 90.1 percent of original size [2023-04-02 15:18:25,250 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 11 disjoint index pairs (out of 120 index pairs), introduced 12 new quantified variables, introduced 21 case distinctions, treesize of input 571 treesize of output 200 [2023-04-02 15:18:26,838 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 23 proven. 48 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-04-02 15:18:26,839 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:18:33,048 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1725653128] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:18:33,049 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [89578168] [2023-04-02 15:18:33,050 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-04-02 15:18:33,050 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:18:33,050 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:18:33,051 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:18:33,051 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:18:33,065 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:18:33,510 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-04-02 15:18:33,512 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:18:33,514 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:18:33,517 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:18:36,467 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4727#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 15:18:36,467 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:18:36,467 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:18:36,467 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 26] total 47 [2023-04-02 15:18:36,468 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216769958] [2023-04-02 15:18:36,468 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:18:36,468 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2023-04-02 15:18:36,468 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:18:36,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2023-04-02 15:18:36,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=447, Invalid=5559, Unknown=0, NotChecked=0, Total=6006 [2023-04-02 15:18:36,470 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand has 47 states, 45 states have (on average 1.3111111111111111) internal successors, (59), 45 states have internal predecessors, (59), 14 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) [2023-04-02 15:18:42,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:18:42,032 INFO L93 Difference]: Finished difference Result 58 states and 68 transitions. [2023-04-02 15:18:42,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2023-04-02 15:18:42,032 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 45 states have (on average 1.3111111111111111) internal successors, (59), 45 states have internal predecessors, (59), 14 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) Word has length 55 [2023-04-02 15:18:42,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:18:42,033 INFO L225 Difference]: With dead ends: 58 [2023-04-02 15:18:42,033 INFO L226 Difference]: Without dead ends: 53 [2023-04-02 15:18:42,035 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3100 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=822, Invalid=9278, Unknown=0, NotChecked=0, Total=10100 [2023-04-02 15:18:42,036 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 13 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 1331 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 1367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 1331 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2023-04-02 15:18:42,036 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 158 Invalid, 1367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 1331 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2023-04-02 15:18:42,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2023-04-02 15:18:42,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2023-04-02 15:18:42,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 33 states have (on average 1.121212121212121) internal successors, (37), 33 states have internal predecessors, (37), 10 states have call successors, (10), 4 states have call predecessors, (10), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-04-02 15:18:42,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 55 transitions. [2023-04-02 15:18:42,060 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 55 transitions. Word has length 55 [2023-04-02 15:18:42,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:18:42,060 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 55 transitions. [2023-04-02 15:18:42,060 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 45 states have (on average 1.3111111111111111) internal successors, (59), 45 states have internal predecessors, (59), 14 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) [2023-04-02 15:18:42,060 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 55 transitions. [2023-04-02 15:18:42,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2023-04-02 15:18:42,061 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:18:42,061 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:18:42,066 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-04-02 15:18:42,262 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-04-02 15:18:42,263 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:18:42,263 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:18:42,263 INFO L85 PathProgramCache]: Analyzing trace with hash -1626617722, now seen corresponding path program 12 times [2023-04-02 15:18:42,263 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:18:42,263 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1354269913] [2023-04-02 15:18:42,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:18:42,264 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:18:42,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:18:42,461 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 16 proven. 40 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-04-02 15:18:42,461 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:18:42,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1354269913] [2023-04-02 15:18:42,461 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1354269913] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:18:42,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [741213106] [2023-04-02 15:18:42,461 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:18:42,461 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:18:42,462 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:18:42,463 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:18:42,465 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-04-02 15:18:42,539 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:18:42,540 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:18:42,541 INFO L262 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 14 conjunts are in the unsatisfiable core [2023-04-02 15:18:42,545 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:18:42,653 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2023-04-02 15:18:42,653 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:18:42,744 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2023-04-02 15:18:42,745 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [741213106] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:18:42,745 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1297591946] [2023-04-02 15:18:42,746 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-04-02 15:18:42,746 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:18:42,746 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:18:42,746 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:18:42,746 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:18:42,767 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:18:43,187 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-04-02 15:18:43,189 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:18:43,190 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:18:43,193 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:18:43,852 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5326#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 15:18:43,852 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:18:43,852 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:18:43,852 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 23 [2023-04-02 15:18:43,853 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069910239] [2023-04-02 15:18:43,853 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:18:43,853 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-04-02 15:18:43,853 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:18:43,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-04-02 15:18:43,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=1357, Unknown=0, NotChecked=0, Total=1560 [2023-04-02 15:18:43,854 INFO L87 Difference]: Start difference. First operand 46 states and 55 transitions. Second operand has 23 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 7 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2023-04-02 15:18:44,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:18:44,043 INFO L93 Difference]: Finished difference Result 76 states and 91 transitions. [2023-04-02 15:18:44,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-04-02 15:18:44,043 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 7 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) Word has length 56 [2023-04-02 15:18:44,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:18:44,043 INFO L225 Difference]: With dead ends: 76 [2023-04-02 15:18:44,044 INFO L226 Difference]: Without dead ends: 52 [2023-04-02 15:18:44,044 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 134 SyntacticMatches, 10 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 809 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=290, Invalid=1780, Unknown=0, NotChecked=0, Total=2070 [2023-04-02 15:18:44,045 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 2 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:18:44,045 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 80 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:18:44,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2023-04-02 15:18:44,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 48. [2023-04-02 15:18:44,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 states have internal predecessors, (37), 11 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-04-02 15:18:44,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 57 transitions. [2023-04-02 15:18:44,073 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 57 transitions. Word has length 56 [2023-04-02 15:18:44,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:18:44,074 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 57 transitions. [2023-04-02 15:18:44,074 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 7 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2023-04-02 15:18:44,074 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 57 transitions. [2023-04-02 15:18:44,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-04-02 15:18:44,074 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:18:44,075 INFO L195 NwaCegarLoop]: trace histogram [8, 6, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:18:44,079 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-04-02 15:18:44,275 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-04-02 15:18:44,275 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:18:44,276 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:18:44,276 INFO L85 PathProgramCache]: Analyzing trace with hash -878552301, now seen corresponding path program 13 times [2023-04-02 15:18:44,276 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:18:44,276 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [945791203] [2023-04-02 15:18:44,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:18:44,276 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:18:44,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:18:44,488 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 22 proven. 44 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2023-04-02 15:18:44,488 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:18:44,488 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [945791203] [2023-04-02 15:18:44,488 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [945791203] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:18:44,488 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1444100110] [2023-04-02 15:18:44,488 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:18:44,488 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:18:44,489 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:18:44,490 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:18:44,492 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-04-02 15:18:44,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:18:44,568 INFO L262 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 14 conjunts are in the unsatisfiable core [2023-04-02 15:18:44,570 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:18:44,672 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 35 proven. 31 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2023-04-02 15:18:44,672 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:18:44,801 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 35 proven. 31 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2023-04-02 15:18:44,801 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1444100110] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:18:44,802 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1179522186] [2023-04-02 15:18:44,803 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-04-02 15:18:44,803 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:18:44,803 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:18:44,803 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:18:44,803 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:18:44,817 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:18:45,287 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-04-02 15:18:45,290 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:18:45,291 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:18:45,294 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:18:45,920 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5959#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 15:18:45,920 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:18:45,920 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:18:45,920 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2023-04-02 15:18:45,920 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179025774] [2023-04-02 15:18:45,920 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:18:45,921 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-04-02 15:18:45,921 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:18:45,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-04-02 15:18:45,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=1294, Unknown=0, NotChecked=0, Total=1482 [2023-04-02 15:18:45,922 INFO L87 Difference]: Start difference. First operand 48 states and 57 transitions. Second operand has 23 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 23 states have internal predecessors, (41), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2023-04-02 15:18:46,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:18:46,178 INFO L93 Difference]: Finished difference Result 54 states and 63 transitions. [2023-04-02 15:18:46,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-04-02 15:18:46,179 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 23 states have internal predecessors, (41), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) Word has length 61 [2023-04-02 15:18:46,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:18:46,179 INFO L225 Difference]: With dead ends: 54 [2023-04-02 15:18:46,179 INFO L226 Difference]: Without dead ends: 49 [2023-04-02 15:18:46,180 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 148 SyntacticMatches, 12 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1021 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=331, Invalid=2219, Unknown=0, NotChecked=0, Total=2550 [2023-04-02 15:18:46,180 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 10 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:18:46,180 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 127 Invalid, 295 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 209 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:18:46,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2023-04-02 15:18:46,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2023-04-02 15:18:46,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 35 states have internal predecessors, (38), 11 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-04-02 15:18:46,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 58 transitions. [2023-04-02 15:18:46,204 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 58 transitions. Word has length 61 [2023-04-02 15:18:46,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:18:46,204 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 58 transitions. [2023-04-02 15:18:46,205 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 23 states have internal predecessors, (41), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2023-04-02 15:18:46,205 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 58 transitions. [2023-04-02 15:18:46,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2023-04-02 15:18:46,205 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:18:46,205 INFO L195 NwaCegarLoop]: trace histogram [8, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:18:46,210 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-04-02 15:18:46,406 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-04-02 15:18:46,406 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:18:46,406 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:18:46,406 INFO L85 PathProgramCache]: Analyzing trace with hash -1819446035, now seen corresponding path program 14 times [2023-04-02 15:18:46,406 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:18:46,406 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1475191670] [2023-04-02 15:18:46,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:18:46,407 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:18:46,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:19:21,694 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-04-02 15:19:21,694 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:19:21,694 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1475191670] [2023-04-02 15:19:21,695 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1475191670] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:19:21,695 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [801884354] [2023-04-02 15:19:21,695 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:19:21,695 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:19:21,695 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:19:21,697 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:19:21,697 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-04-02 15:19:21,824 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2023-04-02 15:19:21,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:19:21,827 INFO L262 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 96 conjunts are in the unsatisfiable core [2023-04-02 15:19:21,832 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:19:21,924 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8