/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 EqDomain -i ../sv-benchmarks/c/array-examples/standard_two_index_08.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 08:46:24,879 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 08:46:24,880 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 08:46:24,909 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 08:46:24,910 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 08:46:24,912 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 08:46:24,915 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 08:46:24,917 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 08:46:24,918 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 08:46:24,921 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 08:46:24,922 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 08:46:24,923 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 08:46:24,923 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 08:46:24,925 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 08:46:24,926 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 08:46:24,927 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 08:46:24,927 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 08:46:24,928 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 08:46:24,929 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 08:46:24,933 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 08:46:24,933 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 08:46:24,934 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 08:46:24,935 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 08:46:24,936 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 08:46:24,941 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-04-01 08:46:24,943 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 08:46:24,944 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 08:46:24,945 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 08:46:24,945 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 08:46:24,946 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 08:46:24,946 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 08:46:24,946 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 08:46:24,946 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 08:46:24,946 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 08:46:24,947 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 08:46:24,947 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 08:46:24,948 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 [2023-04-01 08:46:24,970 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 08:46:24,970 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 08:46:24,970 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 08:46:24,970 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 08:46:24,971 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 08:46:24,971 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 08:46:24,971 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 08:46:24,971 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 08:46:24,971 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 08:46:24,971 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 08:46:24,972 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 08:46:24,972 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 08:46:24,972 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 08:46:24,972 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 08:46:24,973 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 08:46:24,973 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 08:46:24,973 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 08:46:24,973 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 08:46:24,973 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 08:46:24,973 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 08:46:24,973 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 08:46:24,973 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 08:46:24,974 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 08:46:24,974 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 08:46:24,974 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 08:46:24,974 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 08:46:24,974 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 08:46:24,974 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 08:46:24,975 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 08:46:24,975 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 08:46:24,975 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 08:46:24,975 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 08:46:24,975 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 08:46:24,975 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 08:46:24,975 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 08:46:24,975 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 08:46:24,976 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 08:46:24,976 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 08:46:24,976 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 08:46:24,976 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 08:46:24,976 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 08:46:24,976 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 08:46:25,154 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 08:46:25,178 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 08:46:25,180 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 08:46:25,180 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 08:46:25,181 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 08:46:25,182 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_two_index_08.i [2023-04-01 08:46:26,236 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 08:46:26,422 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 08:46:26,422 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_two_index_08.i [2023-04-01 08:46:26,426 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ed6421973/69da849bd3a2446485f30c660e1bcbcf/FLAG45c69a92b [2023-04-01 08:46:26,438 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ed6421973/69da849bd3a2446485f30c660e1bcbcf [2023-04-01 08:46:26,440 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 08:46:26,441 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 08:46:26,443 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 08:46:26,443 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 08:46:26,445 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 08:46:26,445 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 08:46:26" (1/1) ... [2023-04-01 08:46:26,446 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@55478820 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:26, skipping insertion in model container [2023-04-01 08:46:26,447 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 08:46:26" (1/1) ... [2023-04-01 08:46:26,451 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 08:46:26,462 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 08:46:26,557 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_two_index_08.i[814,827] [2023-04-01 08:46:26,568 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 08:46:26,575 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 08:46:26,582 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_two_index_08.i[814,827] [2023-04-01 08:46:26,587 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 08:46:26,601 INFO L208 MainTranslator]: Completed translation [2023-04-01 08:46:26,602 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:26 WrapperNode [2023-04-01 08:46:26,602 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 08:46:26,602 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 08:46:26,602 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 08:46:26,602 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 08:46:26,609 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:26" (1/1) ... [2023-04-01 08:46:26,609 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:26" (1/1) ... [2023-04-01 08:46:26,613 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:26" (1/1) ... [2023-04-01 08:46:26,613 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:26" (1/1) ... [2023-04-01 08:46:26,616 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:26" (1/1) ... [2023-04-01 08:46:26,618 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:26" (1/1) ... [2023-04-01 08:46:26,619 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:26" (1/1) ... [2023-04-01 08:46:26,619 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:26" (1/1) ... [2023-04-01 08:46:26,620 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 08:46:26,621 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 08:46:26,621 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 08:46:26,621 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 08:46:26,621 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:26" (1/1) ... [2023-04-01 08:46:26,625 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 08:46:26,633 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:46:26,647 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) [2023-04-01 08:46:26,651 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 [2023-04-01 08:46:26,670 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 08:46:26,670 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 08:46:26,670 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 08:46:26,670 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 08:46:26,670 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 08:46:26,670 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 08:46:26,670 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 08:46:26,670 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-01 08:46:26,670 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-01 08:46:26,671 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 08:46:26,671 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 08:46:26,671 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 08:46:26,671 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 08:46:26,671 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 08:46:26,671 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-01 08:46:26,671 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 08:46:26,671 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 08:46:26,671 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 08:46:26,671 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 08:46:26,671 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 08:46:26,671 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 08:46:26,715 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 08:46:26,717 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 08:46:26,806 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 08:46:26,821 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 08:46:26,821 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-04-01 08:46:26,822 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 08:46:26 BoogieIcfgContainer [2023-04-01 08:46:26,822 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 08:46:26,824 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 08:46:26,824 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 08:46:26,826 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 08:46:26,826 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 08:46:26" (1/3) ... [2023-04-01 08:46:26,826 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4212102d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 08:46:26, skipping insertion in model container [2023-04-01 08:46:26,826 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:26" (2/3) ... [2023-04-01 08:46:26,827 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4212102d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 08:46:26, skipping insertion in model container [2023-04-01 08:46:26,827 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 08:46:26" (3/3) ... [2023-04-01 08:46:26,827 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_two_index_08.i [2023-04-01 08:46:26,838 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 08:46:26,838 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 08:46:26,864 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 08:46:26,868 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;@132c905e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 08:46:26,868 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 08:46:26,870 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 08:46:26,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-04-01 08:46:26,874 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:46:26,874 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:46:26,875 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:46:26,878 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:46:26,878 INFO L85 PathProgramCache]: Analyzing trace with hash -1320884995, now seen corresponding path program 1 times [2023-04-01 08:46:26,883 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:46:26,884 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1902080529] [2023-04-01 08:46:26,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:26,884 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:46:26,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:27,068 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:46:27,069 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:46:27,069 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1902080529] [2023-04-01 08:46:27,069 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1902080529] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 08:46:27,069 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 08:46:27,070 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 08:46:27,071 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42551126] [2023-04-01 08:46:27,071 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 08:46:27,073 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 08:46:27,074 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:46:27,089 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 08:46:27,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 08:46:27,091 INFO L87 Difference]: Start difference. First operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:27,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:46:27,115 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2023-04-01 08:46:27,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 08:46:27,117 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2023-04-01 08:46:27,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:46:27,120 INFO L225 Difference]: With dead ends: 33 [2023-04-01 08:46:27,120 INFO L226 Difference]: Without dead ends: 17 [2023-04-01 08:46:27,122 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 08:46:27,124 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:46:27,124 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:46:27,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-04-01 08:46:27,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-04-01 08:46:27,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 08:46:27,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2023-04-01 08:46:27,145 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2023-04-01 08:46:27,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:46:27,145 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2023-04-01 08:46:27,146 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:27,146 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2023-04-01 08:46:27,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-04-01 08:46:27,146 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:46:27,146 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:46:27,146 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 08:46:27,147 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:46:27,147 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:46:27,147 INFO L85 PathProgramCache]: Analyzing trace with hash -256932371, now seen corresponding path program 1 times [2023-04-01 08:46:27,147 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:46:27,147 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [367074465] [2023-04-01 08:46:27,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:27,148 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:46:27,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:27,209 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:46:27,209 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:46:27,209 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [367074465] [2023-04-01 08:46:27,210 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [367074465] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:46:27,210 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1596879100] [2023-04-01 08:46:27,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:27,210 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:46:27,210 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:46:27,212 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) [2023-04-01 08:46:27,228 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-01 08:46:27,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:27,275 INFO L262 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 2 conjunts are in the unsatisfiable core [2023-04-01 08:46:27,278 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:46:27,289 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 08:46:27,289 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-01 08:46:27,289 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1596879100] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 08:46:27,289 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-01 08:46:27,289 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2023-04-01 08:46:27,290 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401807844] [2023-04-01 08:46:27,290 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 08:46:27,290 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 08:46:27,291 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:46:27,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 08:46:27,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 08:46:27,292 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:27,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:46:27,308 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2023-04-01 08:46:27,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 08:46:27,308 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2023-04-01 08:46:27,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:46:27,309 INFO L225 Difference]: With dead ends: 30 [2023-04-01 08:46:27,309 INFO L226 Difference]: Without dead ends: 21 [2023-04-01 08:46:27,310 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 08:46:27,311 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 1 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:46:27,311 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 21 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:46:27,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-04-01 08:46:27,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2023-04-01 08:46:27,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 08:46:27,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2023-04-01 08:46:27,316 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2023-04-01 08:46:27,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:46:27,316 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2023-04-01 08:46:27,316 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:27,317 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2023-04-01 08:46:27,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-04-01 08:46:27,317 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:46:27,317 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:46:27,322 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-01 08:46:27,521 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:46:27,522 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:46:27,522 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:46:27,522 INFO L85 PathProgramCache]: Analyzing trace with hash 236958900, now seen corresponding path program 1 times [2023-04-01 08:46:27,522 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:46:27,523 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1007467633] [2023-04-01 08:46:27,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:27,523 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:46:27,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:27,638 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 08:46:27,638 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:46:27,639 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1007467633] [2023-04-01 08:46:27,639 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1007467633] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:46:27,640 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1381674708] [2023-04-01 08:46:27,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:27,640 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:46:27,640 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:46:27,673 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) [2023-04-01 08:46:27,676 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 08:46:27,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:27,735 INFO L262 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-01 08:46:27,736 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:46:27,791 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 08:46:27,791 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:46:27,808 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 08:46:27,808 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1381674708] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:46:27,809 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [190251977] [2023-04-01 08:46:27,837 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-01 08:46:27,837 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:46:27,839 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:46:27,842 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:46:27,842 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:46:27,965 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:46:28,386 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 69 for LOIs [2023-04-01 08:46:28,437 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:46:28,441 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:46:29,097 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '302#(and (exists ((|v_main_~#b~0.base_BEFORE_CALL_1| Int) (|v_old(#length)_BEFORE_CALL_1| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_1| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_1| (Array Int Int)) (|v_main_~#a~0.base_BEFORE_CALL_1| Int)) (and (not (= |v_old(#valid)_BEFORE_CALL_1| |v_old(#length)_BEFORE_CALL_1|)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_1| 1) |v_old(#valid)_BEFORE_CALL_1|)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_1| 1) 0)) (= (select |v_old(#valid)_BEFORE_CALL_1| 1) 1) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_1|)) (= (select |v_old(#length)_BEFORE_CALL_1| 2) 24) (= 2 (select |v_old(#length)_BEFORE_CALL_1| 1)) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_1|)) (= (select |v_old(#valid)_BEFORE_CALL_1| 2) 1) (not (= (select |v_old(#memory_int)_BEFORE_CALL_1| 1) |v_old(#length)_BEFORE_CALL_1|)) (not (= |v_main_~#b~0.base_BEFORE_CALL_1| 0)) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_1|)) (= (select |v_old(#valid)_BEFORE_CALL_1| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_1| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_1| |v_main_~#a~0.base_BEFORE_CALL_1|) 0) (not (= |v_main_~#b~0.base_BEFORE_CALL_1| |#StackHeapBarrier|)) (not (= (select (select |#memory_int| |v_main_~#b~0.base_BEFORE_CALL_1|) 4) (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_1|) 0))) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_1|)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:46:29,098 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:46:29,098 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:46:29,098 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-01 08:46:29,098 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558428508] [2023-04-01 08:46:29,098 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:46:29,098 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-01 08:46:29,098 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:46:29,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-01 08:46:29,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2023-04-01 08:46:29,100 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:29,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:46:29,131 INFO L93 Difference]: Finished difference Result 39 states and 48 transitions. [2023-04-01 08:46:29,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-01 08:46:29,131 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2023-04-01 08:46:29,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:46:29,132 INFO L225 Difference]: With dead ends: 39 [2023-04-01 08:46:29,132 INFO L226 Difference]: Without dead ends: 28 [2023-04-01 08:46:29,132 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2023-04-01 08:46:29,133 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 5 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:46:29,133 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 29 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:46:29,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-04-01 08:46:29,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 22. [2023-04-01 08:46:29,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 08:46:29,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2023-04-01 08:46:29,137 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 14 [2023-04-01 08:46:29,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:46:29,137 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2023-04-01 08:46:29,137 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:29,137 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2023-04-01 08:46:29,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-01 08:46:29,138 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:46:29,138 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:46:29,157 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-04-01 08:46:29,343 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-04-01 08:46:29,343 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:46:29,343 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:46:29,343 INFO L85 PathProgramCache]: Analyzing trace with hash 1112077789, now seen corresponding path program 2 times [2023-04-01 08:46:29,343 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:46:29,346 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [866327220] [2023-04-01 08:46:29,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:29,346 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:46:29,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:29,465 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 08:46:29,465 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:46:29,466 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [866327220] [2023-04-01 08:46:29,466 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [866327220] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:46:29,466 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1553628558] [2023-04-01 08:46:29,466 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:46:29,466 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:46:29,466 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:46:29,473 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) [2023-04-01 08:46:29,474 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-01 08:46:29,516 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-01 08:46:29,516 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:46:29,517 INFO L262 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 08:46:29,518 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:46:29,548 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 08:46:29,548 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:46:29,564 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 08:46:29,565 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1553628558] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:46:29,565 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2030827933] [2023-04-01 08:46:29,566 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-01 08:46:29,566 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:46:29,566 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:46:29,566 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:46:29,567 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:46:29,592 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:46:29,771 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 69 for LOIs [2023-04-01 08:46:29,804 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:46:29,810 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:46:30,306 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '527#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (exists ((|v_main_~#a~0.base_BEFORE_CALL_2| Int) (|v_main_~#b~0.base_BEFORE_CALL_2| Int) (|v_old(#valid)_BEFORE_CALL_2| (Array Int Int)) (|v_old(#length)_BEFORE_CALL_2| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_2| (Array Int (Array Int Int)))) (and (= 2 (select |v_old(#length)_BEFORE_CALL_2| 1)) (not (= |v_main_~#b~0.base_BEFORE_CALL_2| |#StackHeapBarrier|)) (not (= |v_main_~#b~0.base_BEFORE_CALL_2| 0)) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_2|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_2| 1) 1) 0) (= (select |v_old(#length)_BEFORE_CALL_2| 2) 24) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_2|)) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_2|)) (= (select |v_old(#valid)_BEFORE_CALL_2| 0) 0) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_2| 1) 0)) (not (= (select (select |#memory_int| |v_main_~#b~0.base_BEFORE_CALL_2|) 4) (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_2|) 0))) (not (= |v_old(#length)_BEFORE_CALL_2| (select |v_old(#memory_int)_BEFORE_CALL_2| 1))) (not (= |v_old(#valid)_BEFORE_CALL_2| (select |v_old(#memory_int)_BEFORE_CALL_2| 1))) (not (= |v_old(#valid)_BEFORE_CALL_2| |v_old(#length)_BEFORE_CALL_2|)) (= (select |v_old(#valid)_BEFORE_CALL_2| 2) 1) (= (select |v_old(#valid)_BEFORE_CALL_2| |v_main_~#a~0.base_BEFORE_CALL_2|) 0) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_2|)) (= (select |v_old(#valid)_BEFORE_CALL_2| 1) 1))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:46:30,306 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:46:30,306 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:46:30,307 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2023-04-01 08:46:30,307 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065630528] [2023-04-01 08:46:30,307 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:46:30,307 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-01 08:46:30,307 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:46:30,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-01 08:46:30,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2023-04-01 08:46:30,308 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:30,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:46:30,370 INFO L93 Difference]: Finished difference Result 56 states and 70 transitions. [2023-04-01 08:46:30,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-01 08:46:30,371 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2023-04-01 08:46:30,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:46:30,371 INFO L225 Difference]: With dead ends: 56 [2023-04-01 08:46:30,371 INFO L226 Difference]: Without dead ends: 44 [2023-04-01 08:46:30,372 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2023-04-01 08:46:30,372 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 12 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:46:30,372 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 29 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:46:30,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-04-01 08:46:30,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 28. [2023-04-01 08:46:30,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 08:46:30,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2023-04-01 08:46:30,376 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 18 [2023-04-01 08:46:30,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:46:30,376 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2023-04-01 08:46:30,376 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:30,377 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2023-04-01 08:46:30,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-04-01 08:46:30,377 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:46:30,377 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:46:30,386 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-01 08:46:30,582 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:46:30,582 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:46:30,583 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:46:30,583 INFO L85 PathProgramCache]: Analyzing trace with hash 175052189, now seen corresponding path program 3 times [2023-04-01 08:46:30,583 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:46:30,583 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1600196291] [2023-04-01 08:46:30,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:30,583 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:46:30,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:30,715 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-01 08:46:30,715 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:46:30,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1600196291] [2023-04-01 08:46:30,715 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1600196291] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:46:30,716 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [672465749] [2023-04-01 08:46:30,716 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 08:46:30,716 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:46:30,716 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:46:30,729 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) [2023-04-01 08:46:30,731 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-01 08:46:30,783 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 08:46:30,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:46:30,784 INFO L262 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-01 08:46:30,785 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:46:30,824 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-01 08:46:30,824 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:46:30,883 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-01 08:46:30,883 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [672465749] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:46:30,884 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1962869671] [2023-04-01 08:46:30,885 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-01 08:46:30,885 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:46:30,885 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:46:30,885 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:46:30,885 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:46:30,904 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:46:31,045 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 69 for LOIs [2023-04-01 08:46:31,077 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:46:31,080 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:46:31,604 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '845#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (exists ((|v_main_~#a~0.base_BEFORE_CALL_3| Int) (|v_old(#length)_BEFORE_CALL_3| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_3| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_3| (Array Int Int)) (|v_main_~#b~0.base_BEFORE_CALL_3| Int)) (and (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_3|)) (not (= |v_main_~#b~0.base_BEFORE_CALL_3| |#StackHeapBarrier|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_3| 1) 0) 48) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_3|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_3| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_3| 0) 0) (not (= (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_3|) 0) (select (select |#memory_int| |v_main_~#b~0.base_BEFORE_CALL_3|) 4))) (not (= |v_old(#valid)_BEFORE_CALL_3| |v_old(#length)_BEFORE_CALL_3|)) (not (= |v_main_~#b~0.base_BEFORE_CALL_3| 0)) (= (select |v_old(#length)_BEFORE_CALL_3| 2) 24) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_3|)) (= 2 (select |v_old(#length)_BEFORE_CALL_3| 1)) (not (= |v_old(#length)_BEFORE_CALL_3| (select |v_old(#memory_int)_BEFORE_CALL_3| 1))) (= (select |v_old(#valid)_BEFORE_CALL_3| |v_main_~#a~0.base_BEFORE_CALL_3|) 0) (not (= |v_old(#valid)_BEFORE_CALL_3| (select |v_old(#memory_int)_BEFORE_CALL_3| 1))) (= (select |v_old(#valid)_BEFORE_CALL_3| 2) 1) (= (select |v_old(#valid)_BEFORE_CALL_3| 1) 1) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_3|)))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:46:31,604 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:46:31,604 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:46:31,604 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 23 [2023-04-01 08:46:31,605 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908557712] [2023-04-01 08:46:31,605 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:46:31,605 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-04-01 08:46:31,605 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:46:31,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-04-01 08:46:31,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=797, Unknown=0, NotChecked=0, Total=1122 [2023-04-01 08:46:31,606 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 23 states, 23 states have (on average 1.434782608695652) internal successors, (33), 23 states have internal predecessors, (33), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:31,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:46:31,690 INFO L93 Difference]: Finished difference Result 84 states and 111 transitions. [2023-04-01 08:46:31,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-04-01 08:46:31,690 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.434782608695652) internal successors, (33), 23 states have internal predecessors, (33), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2023-04-01 08:46:31,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:46:31,691 INFO L225 Difference]: With dead ends: 84 [2023-04-01 08:46:31,691 INFO L226 Difference]: Without dead ends: 68 [2023-04-01 08:46:31,691 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 556 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=325, Invalid=797, Unknown=0, NotChecked=0, Total=1122 [2023-04-01 08:46:31,692 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 12 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:46:31,692 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 65 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:46:31,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2023-04-01 08:46:31,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 44. [2023-04-01 08:46:31,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 08:46:31,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2023-04-01 08:46:31,697 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 24 [2023-04-01 08:46:31,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:46:31,698 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2023-04-01 08:46:31,698 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.434782608695652) internal successors, (33), 23 states have internal predecessors, (33), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:31,698 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2023-04-01 08:46:31,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-04-01 08:46:31,698 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:46:31,698 INFO L195 NwaCegarLoop]: trace histogram [20, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:46:31,717 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-04-01 08:46:31,899 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:46:31,899 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:46:31,900 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:46:31,900 INFO L85 PathProgramCache]: Analyzing trace with hash 566203517, now seen corresponding path program 4 times [2023-04-01 08:46:31,900 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:46:31,900 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [309474552] [2023-04-01 08:46:31,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:31,900 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:46:31,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:32,221 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2023-04-01 08:46:32,221 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:46:32,221 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [309474552] [2023-04-01 08:46:32,221 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [309474552] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:46:32,221 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [991951616] [2023-04-01 08:46:32,221 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 08:46:32,222 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:46:32,222 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:46:32,223 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) [2023-04-01 08:46:32,225 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-01 08:46:32,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:32,307 INFO L262 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 22 conjunts are in the unsatisfiable core [2023-04-01 08:46:32,309 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:46:32,434 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-04-01 08:46:32,435 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:46:32,741 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-04-01 08:46:32,742 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [991951616] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:46:32,743 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2140904744] [2023-04-01 08:46:32,744 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-01 08:46:32,744 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:46:32,744 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:46:32,744 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:46:32,745 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:46:32,785 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:46:32,924 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 69 for LOIs [2023-04-01 08:46:32,958 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:46:32,960 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:46:33,473 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1372#(and (= |__VERIFIER_assert_#in~cond| 0) (exists ((|v_main_~#a~0.base_BEFORE_CALL_4| Int) (|v_old(#memory_int)_BEFORE_CALL_4| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_4| (Array Int Int)) (|v_old(#length)_BEFORE_CALL_4| (Array Int Int)) (|v_main_~#b~0.base_BEFORE_CALL_4| Int)) (and (= (select |v_old(#length)_BEFORE_CALL_4| 1) 2) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_4|)) (not (= |v_main_~#b~0.base_BEFORE_CALL_4| |#StackHeapBarrier|)) (not (= (select (select |#memory_int| |v_main_~#b~0.base_BEFORE_CALL_4|) 4) (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_4|) 0))) (= (select |v_old(#valid)_BEFORE_CALL_4| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_4| 0) 0) (not (= |v_old(#valid)_BEFORE_CALL_4| |v_old(#length)_BEFORE_CALL_4|)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_4| 1) |v_old(#length)_BEFORE_CALL_4|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_4| 1) 1) 0) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_4|)) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_4|)) (= (select |v_old(#valid)_BEFORE_CALL_4| |v_main_~#a~0.base_BEFORE_CALL_4|) 0) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_4|)) (not (= |v_old(#valid)_BEFORE_CALL_4| (select |v_old(#memory_int)_BEFORE_CALL_4| 1))) (= (select |v_old(#length)_BEFORE_CALL_4| 2) 24) (not (= |v_main_~#b~0.base_BEFORE_CALL_4| 0)) (= (select |v_old(#valid)_BEFORE_CALL_4| 2) 1) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_4| 1) 0)))) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:46:33,474 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:46:33,474 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:46:33,474 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 23, 23] total 51 [2023-04-01 08:46:33,474 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472217709] [2023-04-01 08:46:33,474 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:46:33,474 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2023-04-01 08:46:33,475 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:46:33,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2023-04-01 08:46:33,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1403, Invalid=2379, Unknown=0, NotChecked=0, Total=3782 [2023-04-01 08:46:33,477 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand has 51 states, 51 states have (on average 1.2352941176470589) internal successors, (63), 51 states have internal predecessors, (63), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:33,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:46:33,665 INFO L93 Difference]: Finished difference Result 130 states and 177 transitions. [2023-04-01 08:46:33,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2023-04-01 08:46:33,666 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.2352941176470589) internal successors, (63), 51 states have internal predecessors, (63), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2023-04-01 08:46:33,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:46:33,670 INFO L225 Difference]: With dead ends: 130 [2023-04-01 08:46:33,670 INFO L226 Difference]: Without dead ends: 112 [2023-04-01 08:46:33,671 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2246 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1403, Invalid=2379, Unknown=0, NotChecked=0, Total=3782 [2023-04-01 08:46:33,673 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 34 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 185 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 185 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:46:33,673 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 65 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 185 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:46:33,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2023-04-01 08:46:33,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 76. [2023-04-01 08:46:33,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 08:46:33,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2023-04-01 08:46:33,693 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 40 [2023-04-01 08:46:33,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:46:33,693 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2023-04-01 08:46:33,693 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.2352941176470589) internal successors, (63), 51 states have internal predecessors, (63), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:33,694 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2023-04-01 08:46:33,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2023-04-01 08:46:33,694 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:46:33,695 INFO L195 NwaCegarLoop]: trace histogram [48, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:46:33,702 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-04-01 08:46:33,904 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:46:33,905 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:46:33,905 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:46:33,905 INFO L85 PathProgramCache]: Analyzing trace with hash -1854543299, now seen corresponding path program 5 times [2023-04-01 08:46:33,905 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:46:33,905 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1965628910] [2023-04-01 08:46:33,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:33,905 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:46:33,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:34,195 INFO L134 CoverageAnalysis]: Checked inductivity of 1254 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 1176 trivial. 0 not checked. [2023-04-01 08:46:34,195 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:46:34,195 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1965628910] [2023-04-01 08:46:34,195 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1965628910] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:46:34,195 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1852356390] [2023-04-01 08:46:34,195 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:46:34,195 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:46:34,195 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:46:34,196 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) [2023-04-01 08:46:34,209 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-01 08:46:35,054 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-04-01 08:46:35,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:46:35,057 INFO L262 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 14 conjunts are in the unsatisfiable core [2023-04-01 08:46:35,059 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:46:35,085 INFO L134 CoverageAnalysis]: Checked inductivity of 1254 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 1176 trivial. 0 not checked. [2023-04-01 08:46:35,085 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:46:35,297 INFO L134 CoverageAnalysis]: Checked inductivity of 1254 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 1176 trivial. 0 not checked. [2023-04-01 08:46:35,297 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1852356390] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:46:35,297 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [94772700] [2023-04-01 08:46:35,298 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-01 08:46:35,298 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:46:35,299 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:46:35,299 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:46:35,299 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:46:35,320 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:46:35,475 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 69 for LOIs [2023-04-01 08:46:35,494 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:46:35,496 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:46:36,101 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2221#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (exists ((|v_main_~#a~0.base_BEFORE_CALL_5| Int) (|v_old(#memory_int)_BEFORE_CALL_5| (Array Int (Array Int Int))) (|v_old(#length)_BEFORE_CALL_5| (Array Int Int)) (|v_old(#valid)_BEFORE_CALL_5| (Array Int Int)) (|v_main_~#b~0.base_BEFORE_CALL_5| Int)) (and (not (= |v_old(#valid)_BEFORE_CALL_5| (select |v_old(#memory_int)_BEFORE_CALL_5| 1))) (not (= |v_main_~#b~0.base_BEFORE_CALL_5| |#StackHeapBarrier|)) (= (select |v_old(#valid)_BEFORE_CALL_5| 1) 1) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_5|)) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_5|)) (= (select |v_old(#length)_BEFORE_CALL_5| 2) 24) (not (= |v_main_~#b~0.base_BEFORE_CALL_5| 0)) (= (select |v_old(#valid)_BEFORE_CALL_5| 2) 1) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_5|)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_5| 1) 0)) (not (= (select (select |#memory_int| |v_main_~#b~0.base_BEFORE_CALL_5|) 4) (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_5|) 0))) (= (select (select |v_old(#memory_int)_BEFORE_CALL_5| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_5| |v_main_~#a~0.base_BEFORE_CALL_5|) 0) (not (= (select |v_old(#memory_int)_BEFORE_CALL_5| 1) |v_old(#length)_BEFORE_CALL_5|)) (= (select |v_old(#valid)_BEFORE_CALL_5| 0) 0) (not (= |v_old(#valid)_BEFORE_CALL_5| |v_old(#length)_BEFORE_CALL_5|)) (= 2 (select |v_old(#length)_BEFORE_CALL_5| 1)) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_5|)))) (= |#NULL.base| 0))' at error location [2023-04-01 08:46:36,101 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:46:36,101 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:46:36,101 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2023-04-01 08:46:36,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042980133] [2023-04-01 08:46:36,102 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:46:36,102 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-04-01 08:46:36,102 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:46:36,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-04-01 08:46:36,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=493, Invalid=1067, Unknown=0, NotChecked=0, Total=1560 [2023-04-01 08:46:36,103 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 29 states have internal predecessors, (37), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:36,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:46:36,299 INFO L93 Difference]: Finished difference Result 175 states and 216 transitions. [2023-04-01 08:46:36,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2023-04-01 08:46:36,300 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 29 states have internal predecessors, (37), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 72 [2023-04-01 08:46:36,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:46:36,301 INFO L225 Difference]: With dead ends: 175 [2023-04-01 08:46:36,301 INFO L226 Difference]: Without dead ends: 166 [2023-04-01 08:46:36,301 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 192 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=493, Invalid=1067, Unknown=0, NotChecked=0, Total=1560 [2023-04-01 08:46:36,302 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 77 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 208 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 354 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 208 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 08:46:36,302 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 56 Invalid, 354 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [208 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 08:46:36,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2023-04-01 08:46:36,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 90. [2023-04-01 08:46:36,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 84 states have internal predecessors, (87), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 08:46:36,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2023-04-01 08:46:36,311 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 72 [2023-04-01 08:46:36,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:46:36,311 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2023-04-01 08:46:36,311 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 29 states have internal predecessors, (37), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:36,311 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2023-04-01 08:46:36,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-04-01 08:46:36,312 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:46:36,312 INFO L195 NwaCegarLoop]: trace histogram [48, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:46:36,319 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-04-01 08:46:36,519 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:46:36,519 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:46:36,519 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:46:36,519 INFO L85 PathProgramCache]: Analyzing trace with hash -1135479715, now seen corresponding path program 6 times [2023-04-01 08:46:36,519 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:46:36,519 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1726419012] [2023-04-01 08:46:36,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:36,520 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:46:36,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:37,339 INFO L134 CoverageAnalysis]: Checked inductivity of 1527 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 1176 trivial. 0 not checked. [2023-04-01 08:46:37,339 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:46:37,339 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1726419012] [2023-04-01 08:46:37,339 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1726419012] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:46:37,339 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1543590335] [2023-04-01 08:46:37,339 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 08:46:37,339 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:46:37,339 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:46:37,340 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) [2023-04-01 08:46:37,380 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-01 08:46:37,526 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 08:46:37,526 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:46:37,528 INFO L262 TraceCheckSpWp]: Trace formula consists of 754 conjuncts, 50 conjunts are in the unsatisfiable core [2023-04-01 08:46:37,531 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:46:37,851 INFO L134 CoverageAnalysis]: Checked inductivity of 1527 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2023-04-01 08:46:37,851 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:46:39,487 INFO L134 CoverageAnalysis]: Checked inductivity of 1527 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2023-04-01 08:46:39,488 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1543590335] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:46:39,488 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [353600002] [2023-04-01 08:46:39,489 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-01 08:46:39,489 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:46:39,489 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:46:39,489 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:46:39,489 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:46:39,519 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:46:39,641 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 69 for LOIs [2023-04-01 08:46:39,658 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:46:39,660 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:46:40,263 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3352#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (exists ((|v_old(#valid)_BEFORE_CALL_6| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_6| (Array Int (Array Int Int))) (|v_main_~#a~0.base_BEFORE_CALL_6| Int) (|v_old(#length)_BEFORE_CALL_6| (Array Int Int)) (|v_main_~#b~0.base_BEFORE_CALL_6| Int)) (and (= (select (select |v_old(#memory_int)_BEFORE_CALL_6| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_6| |v_main_~#a~0.base_BEFORE_CALL_6|) 0) (not (= |v_old(#valid)_BEFORE_CALL_6| |v_old(#length)_BEFORE_CALL_6|)) (not (= (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_6|) 0) (select (select |#memory_int| |v_main_~#b~0.base_BEFORE_CALL_6|) 4))) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_6|)) (= (select |v_old(#length)_BEFORE_CALL_6| 2) 24) (= (select (select |v_old(#memory_int)_BEFORE_CALL_6| 1) 0) 48) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_6|)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_6| 1) |v_old(#length)_BEFORE_CALL_6|)) (= (select |v_old(#valid)_BEFORE_CALL_6| 2) 1) (not (= |v_main_~#b~0.base_BEFORE_CALL_6| 0)) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_6|)) (= (select |v_old(#length)_BEFORE_CALL_6| 1) 2) (not (= |v_old(#valid)_BEFORE_CALL_6| (select |v_old(#memory_int)_BEFORE_CALL_6| 1))) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_6|)) (= (select |v_old(#valid)_BEFORE_CALL_6| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_6| 0) 0) (not (= |v_main_~#b~0.base_BEFORE_CALL_6| |#StackHeapBarrier|)))) (= |#NULL.base| 0))' at error location [2023-04-01 08:46:40,263 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:46:40,263 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:46:40,263 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 51, 51] total 122 [2023-04-01 08:46:40,264 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506620873] [2023-04-01 08:46:40,264 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:46:40,264 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 122 states [2023-04-01 08:46:40,264 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:46:40,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2023-04-01 08:46:40,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7651, Invalid=9905, Unknown=0, NotChecked=0, Total=17556 [2023-04-01 08:46:40,270 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand has 122 states, 122 states have (on average 1.1229508196721312) internal successors, (137), 122 states have internal predecessors, (137), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:40,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:46:40,926 INFO L93 Difference]: Finished difference Result 305 states and 420 transitions. [2023-04-01 08:46:40,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2023-04-01 08:46:40,926 INFO L78 Accepts]: Start accepts. Automaton has has 122 states, 122 states have (on average 1.1229508196721312) internal successors, (137), 122 states have internal predecessors, (137), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 86 [2023-04-01 08:46:40,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:46:40,928 INFO L225 Difference]: With dead ends: 305 [2023-04-01 08:46:40,928 INFO L226 Difference]: Without dead ends: 269 [2023-04-01 08:46:40,931 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10298 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=7651, Invalid=9905, Unknown=0, NotChecked=0, Total=17556 [2023-04-01 08:46:40,932 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 171 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 329 mSolverCounterSat, 410 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 739 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 410 IncrementalHoareTripleChecker+Valid, 329 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-01 08:46:40,932 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [205 Valid, 74 Invalid, 739 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [410 Valid, 329 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-01 08:46:40,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2023-04-01 08:46:40,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 169. [2023-04-01 08:46:40,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 163 states have (on average 1.01840490797546) internal successors, (166), 163 states have internal predecessors, (166), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 08:46:40,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 171 transitions. [2023-04-01 08:46:40,957 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 171 transitions. Word has length 86 [2023-04-01 08:46:40,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:46:40,957 INFO L495 AbstractCegarLoop]: Abstraction has 169 states and 171 transitions. [2023-04-01 08:46:40,957 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 122 states, 122 states have (on average 1.1229508196721312) internal successors, (137), 122 states have internal predecessors, (137), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:40,957 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 171 transitions. [2023-04-01 08:46:40,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2023-04-01 08:46:40,959 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:46:40,959 INFO L195 NwaCegarLoop]: trace histogram [119, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:46:40,965 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-04-01 08:46:41,168 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:46:41,168 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:46:41,169 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:46:41,169 INFO L85 PathProgramCache]: Analyzing trace with hash 767460045, now seen corresponding path program 7 times [2023-04-01 08:46:41,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:46:41,169 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1317619734] [2023-04-01 08:46:41,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:41,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:46:41,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:42,553 INFO L134 CoverageAnalysis]: Checked inductivity of 7735 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 7140 trivial. 0 not checked. [2023-04-01 08:46:42,553 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:46:42,554 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1317619734] [2023-04-01 08:46:42,554 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1317619734] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:46:42,554 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [150315258] [2023-04-01 08:46:42,554 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 08:46:42,554 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:46:42,554 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:46:42,555 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) [2023-04-01 08:46:42,557 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-01 08:46:42,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:42,853 INFO L262 TraceCheckSpWp]: Trace formula consists of 1465 conjuncts, 121 conjunts are in the unsatisfiable core [2023-04-01 08:46:42,857 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:46:43,903 INFO L134 CoverageAnalysis]: Checked inductivity of 7735 backedges. 0 proven. 7140 refuted. 0 times theorem prover too weak. 595 trivial. 0 not checked. [2023-04-01 08:46:43,903 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:46:50,434 INFO L134 CoverageAnalysis]: Checked inductivity of 7735 backedges. 0 proven. 7140 refuted. 0 times theorem prover too weak. 595 trivial. 0 not checked. [2023-04-01 08:46:50,434 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [150315258] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:46:50,434 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [943853132] [2023-04-01 08:46:50,436 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-01 08:46:50,436 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:46:50,436 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:46:50,436 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:46:50,436 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:46:50,463 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:46:50,588 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 69 for LOIs [2023-04-01 08:46:50,612 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:46:50,613 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:46:51,221 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5508#(and (exists ((|v_old(#valid)_BEFORE_CALL_7| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_7| (Array Int (Array Int Int))) (|v_main_~#a~0.base_BEFORE_CALL_7| Int) (|v_main_~#b~0.base_BEFORE_CALL_7| Int) (|v_old(#length)_BEFORE_CALL_7| (Array Int Int))) (and (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_7|)) (= (select |v_old(#valid)_BEFORE_CALL_7| 1) 1) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_7|)) (= (select |v_old(#valid)_BEFORE_CALL_7| 2) 1) (= (select |v_old(#valid)_BEFORE_CALL_7| 0) 0) (= 24 (select |v_old(#length)_BEFORE_CALL_7| 2)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_7| 1) 1) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_7| 1) 0) 48) (not (= (select (select |#memory_int| |v_main_~#b~0.base_BEFORE_CALL_7|) 4) (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_7|) 0))) (not (= (select |v_old(#memory_int)_BEFORE_CALL_7| 1) |v_old(#valid)_BEFORE_CALL_7|)) (= 2 (select |v_old(#length)_BEFORE_CALL_7| 1)) (not (= |v_main_~#b~0.base_BEFORE_CALL_7| |#StackHeapBarrier|)) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_7|)) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_7|)) (= (select |v_old(#valid)_BEFORE_CALL_7| |v_main_~#a~0.base_BEFORE_CALL_7|) 0) (not (= (select |v_old(#memory_int)_BEFORE_CALL_7| 1) |v_old(#length)_BEFORE_CALL_7|)) (not (= |v_main_~#b~0.base_BEFORE_CALL_7| 0)) (not (= |v_old(#valid)_BEFORE_CALL_7| |v_old(#length)_BEFORE_CALL_7|)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:46:51,222 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:46:51,222 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:46:51,222 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 122, 122] total 263 [2023-04-01 08:46:51,224 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608973070] [2023-04-01 08:46:51,224 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:46:51,226 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 263 states [2023-04-01 08:46:51,226 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:46:51,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 263 interpolants. [2023-04-01 08:46:51,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35005, Invalid=39797, Unknown=0, NotChecked=0, Total=74802 [2023-04-01 08:46:51,256 INFO L87 Difference]: Start difference. First operand 169 states and 171 transitions. Second operand has 263 states, 263 states have (on average 1.091254752851711) internal successors, (287), 263 states have internal predecessors, (287), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:54,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:46:54,239 INFO L93 Difference]: Finished difference Result 520 states and 730 transitions. [2023-04-01 08:46:54,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 263 states. [2023-04-01 08:46:54,240 INFO L78 Accepts]: Start accepts. Automaton has has 263 states, 263 states have (on average 1.091254752851711) internal successors, (287), 263 states have internal predecessors, (287), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 165 [2023-04-01 08:46:54,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:46:54,243 INFO L225 Difference]: With dead ends: 520 [2023-04-01 08:46:54,243 INFO L226 Difference]: Without dead ends: 476 [2023-04-01 08:46:54,246 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 531 GetRequests, 259 SyntacticMatches, 0 SemanticMatches, 272 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46892 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=35005, Invalid=39797, Unknown=0, NotChecked=0, Total=74802 [2023-04-01 08:46:54,247 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 235 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 729 mSolverCounterSat, 549 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 286 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 1278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 549 IncrementalHoareTripleChecker+Valid, 729 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-01 08:46:54,247 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [286 Valid, 101 Invalid, 1278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [549 Valid, 729 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-04-01 08:46:54,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 476 states. [2023-04-01 08:46:54,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 476 to 326. [2023-04-01 08:46:54,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 326 states, 320 states have (on average 1.009375) internal successors, (323), 320 states have internal predecessors, (323), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 08:46:54,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 326 states to 326 states and 328 transitions. [2023-04-01 08:46:54,267 INFO L78 Accepts]: Start accepts. Automaton has 326 states and 328 transitions. Word has length 165 [2023-04-01 08:46:54,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:46:54,267 INFO L495 AbstractCegarLoop]: Abstraction has 326 states and 328 transitions. [2023-04-01 08:46:54,268 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 263 states, 263 states have (on average 1.091254752851711) internal successors, (287), 263 states have internal predecessors, (287), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:54,268 INFO L276 IsEmpty]: Start isEmpty. Operand 326 states and 328 transitions. [2023-04-01 08:46:54,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2023-04-01 08:46:54,272 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:46:54,273 INFO L195 NwaCegarLoop]: trace histogram [260, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:46:54,279 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-04-01 08:46:54,479 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-04-01 08:46:54,479 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:46:54,480 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:46:54,480 INFO L85 PathProgramCache]: Analyzing trace with hash -842249507, now seen corresponding path program 8 times [2023-04-01 08:46:54,480 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:46:54,480 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [322993306] [2023-04-01 08:46:54,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:54,480 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:46:54,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:57,880 INFO L134 CoverageAnalysis]: Checked inductivity of 35205 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 33930 trivial. 0 not checked. [2023-04-01 08:46:57,880 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:46:57,881 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [322993306] [2023-04-01 08:46:57,881 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [322993306] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:46:57,881 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1478554787] [2023-04-01 08:46:57,881 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:46:57,881 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:46:57,881 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:46:57,882 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) [2023-04-01 08:46:57,884 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process