/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 22:23:48,993 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 22:23:48,994 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 22:23:49,018 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 22:23:49,019 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 22:23:49,019 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 22:23:49,020 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 22:23:49,022 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 22:23:49,024 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 22:23:49,024 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 22:23:49,025 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 22:23:49,026 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 22:23:49,026 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 22:23:49,027 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 22:23:49,028 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 22:23:49,029 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 22:23:49,030 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 22:23:49,030 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 22:23:49,032 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 22:23:49,033 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 22:23:49,034 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 22:23:49,035 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 22:23:49,036 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 22:23:49,037 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 22:23:49,040 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-02 22:23:49,040 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-02 22:23:49,040 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-02 22:23:49,041 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-02 22:23:49,041 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-02 22:23:49,042 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-02 22:23:49,042 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 22:23:49,043 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 22:23:49,044 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 22:23:49,044 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 22:23:49,045 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 22:23:49,045 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 22:23:49,046 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 22:23:49,046 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 22:23:49,046 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 22:23:49,047 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 22:23:49,048 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 22:23:49,049 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-02 22:23:49,067 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 22:23:49,068 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 22:23:49,068 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 22:23:49,068 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 22:23:49,069 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 22:23:49,069 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 22:23:49,069 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 22:23:49,069 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 22:23:49,069 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 22:23:49,069 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 22:23:49,070 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 22:23:49,070 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 22:23:49,070 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 22:23:49,070 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 22:23:49,070 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 22:23:49,070 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 22:23:49,071 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 22:23:49,071 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 22:23:49,071 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 22:23:49,072 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 22:23:49,072 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 22:23:49,072 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 22:23:49,072 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 22:23:49,072 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 22:23:49,072 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 22:23:49,073 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 22:23:49,073 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 22:23:49,073 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 22:23:49,073 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 22:23:49,073 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 22:23:49,073 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 22:23:49,073 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 22:23:49,073 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:23:49,074 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 22:23:49,074 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 22:23:49,074 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 22:23:49,074 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 22:23:49,074 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 22:23:49,074 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 22:23:49,074 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 22:23:49,074 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 22:23:49,075 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 22:23:49,300 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 22:23:49,323 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 22:23:49,326 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 22:23:49,327 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 22:23:49,328 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 22:23:49,329 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c [2023-04-02 22:23:50,476 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 22:23:50,647 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 22:23:50,648 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c [2023-04-02 22:23:50,652 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c2b344711/eb73fb9c5df44b729220bb87f2c157f9/FLAG54e097ddc [2023-04-02 22:23:50,662 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c2b344711/eb73fb9c5df44b729220bb87f2c157f9 [2023-04-02 22:23:50,664 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 22:23:50,665 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 22:23:50,666 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 22:23:50,666 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 22:23:50,668 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 22:23:50,669 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:23:50" (1/1) ... [2023-04-02 22:23:50,670 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@44f99681 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:23:50, skipping insertion in model container [2023-04-02 22:23:50,670 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:23:50" (1/1) ... [2023-04-02 22:23:50,675 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 22:23:50,686 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 22:23:50,785 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/loops-crafted-1/nested3-1_abstracted.c[739,752] [2023-04-02 22:23:50,799 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:23:50,806 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 22:23:50,814 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/loops-crafted-1/nested3-1_abstracted.c[739,752] [2023-04-02 22:23:50,819 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:23:50,830 INFO L208 MainTranslator]: Completed translation [2023-04-02 22:23:50,830 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:23:50 WrapperNode [2023-04-02 22:23:50,831 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 22:23:50,831 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 22:23:50,832 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 22:23:50,832 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 22:23:50,840 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:23:50" (1/1) ... [2023-04-02 22:23:50,841 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:23:50" (1/1) ... [2023-04-02 22:23:50,845 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:23:50" (1/1) ... [2023-04-02 22:23:50,845 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:23:50" (1/1) ... [2023-04-02 22:23:50,848 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:23:50" (1/1) ... [2023-04-02 22:23:50,851 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:23:50" (1/1) ... [2023-04-02 22:23:50,852 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:23:50" (1/1) ... [2023-04-02 22:23:50,853 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:23:50" (1/1) ... [2023-04-02 22:23:50,854 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 22:23:50,855 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 22:23:50,855 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 22:23:50,855 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 22:23:50,856 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:23:50" (1/1) ... [2023-04-02 22:23:50,861 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:23:50,871 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:23:50,886 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-02 22:23:50,890 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-02 22:23:50,914 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 22:23:50,914 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 22:23:50,914 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 22:23:50,914 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 22:23:50,914 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 22:23:50,914 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 22:23:50,914 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 22:23:50,914 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2023-04-02 22:23:50,915 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2023-04-02 22:23:50,915 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_double [2023-04-02 22:23:50,915 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_float [2023-04-02 22:23:50,915 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_ulong [2023-04-02 22:23:50,915 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_ulonglong [2023-04-02 22:23:50,915 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2023-04-02 22:23:50,915 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 22:23:50,915 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 22:23:50,915 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 22:23:50,916 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 22:23:50,916 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 22:23:50,916 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 22:23:50,916 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 22:23:50,916 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 22:23:50,916 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 22:23:50,916 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 22:23:50,916 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 22:23:50,970 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 22:23:50,972 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 22:23:51,092 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 22:23:51,145 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 22:23:51,146 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-04-02 22:23:51,148 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:23:51 BoogieIcfgContainer [2023-04-02 22:23:51,148 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 22:23:51,150 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 22:23:51,150 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 22:23:51,153 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 22:23:51,153 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 10:23:50" (1/3) ... [2023-04-02 22:23:51,153 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3622916b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:23:51, skipping insertion in model container [2023-04-02 22:23:51,153 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:23:50" (2/3) ... [2023-04-02 22:23:51,154 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3622916b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:23:51, skipping insertion in model container [2023-04-02 22:23:51,154 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:23:51" (3/3) ... [2023-04-02 22:23:51,155 INFO L112 eAbstractionObserver]: Analyzing ICFG nested3-1_abstracted.c [2023-04-02 22:23:51,170 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 22:23:51,170 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 22:23:51,257 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 22:23:51,266 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;@5cbb8e84, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 22:23:51,266 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 22:23:51,270 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-02 22:23:51,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-04-02 22:23:51,275 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:23:51,276 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:23:51,276 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:23:51,283 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:23:51,284 INFO L85 PathProgramCache]: Analyzing trace with hash -1824935055, now seen corresponding path program 1 times [2023-04-02 22:23:51,292 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:23:51,293 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1800873131] [2023-04-02 22:23:51,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:23:51,294 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:23:51,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:23:51,591 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:23:51,591 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:23:51,592 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1800873131] [2023-04-02 22:23:51,592 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1800873131] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:23:51,592 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:23:51,593 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-02 22:23:51,594 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759700877] [2023-04-02 22:23:51,595 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:23:51,598 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 22:23:51,599 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:23:51,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 22:23:51,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 22:23:51,625 INFO L87 Difference]: Start difference. First operand has 22 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:23:51,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:23:51,680 INFO L93 Difference]: Finished difference Result 45 states and 62 transitions. [2023-04-02 22:23:51,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 22:23:51,684 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 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 10 [2023-04-02 22:23:51,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:23:51,690 INFO L225 Difference]: With dead ends: 45 [2023-04-02 22:23:51,691 INFO L226 Difference]: Without dead ends: 24 [2023-04-02 22:23:51,693 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 22:23:51,700 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 4 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:23:51,700 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 34 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:23:51,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-04-02 22:23:51,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 19. [2023-04-02 22:23:51,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 22:23:51,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2023-04-02 22:23:51,738 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 10 [2023-04-02 22:23:51,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:23:51,740 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2023-04-02 22:23:51,740 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:23:51,740 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2023-04-02 22:23:51,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-04-02 22:23:51,745 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:23:51,745 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:23:51,745 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 22:23:51,746 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:23:51,750 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:23:51,750 INFO L85 PathProgramCache]: Analyzing trace with hash 1369059014, now seen corresponding path program 1 times [2023-04-02 22:23:51,750 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:23:51,750 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [588790183] [2023-04-02 22:23:51,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:23:51,751 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:23:51,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:23:51,958 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:23:51,959 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:23:51,959 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [588790183] [2023-04-02 22:23:51,959 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [588790183] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:23:51,959 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:23:51,960 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-02 22:23:51,960 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705120058] [2023-04-02 22:23:51,960 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:23:51,961 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 22:23:51,961 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:23:51,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 22:23:51,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-02 22:23:51,962 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:23:52,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:23:52,033 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2023-04-02 22:23:52,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-02 22:23:52,034 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 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 11 [2023-04-02 22:23:52,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:23:52,035 INFO L225 Difference]: With dead ends: 30 [2023-04-02 22:23:52,035 INFO L226 Difference]: Without dead ends: 28 [2023-04-02 22:23:52,035 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-04-02 22:23:52,036 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 10 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:23:52,037 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 64 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:23:52,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-04-02 22:23:52,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 23. [2023-04-02 22:23:52,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 22:23:52,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2023-04-02 22:23:52,043 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 11 [2023-04-02 22:23:52,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:23:52,043 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2023-04-02 22:23:52,044 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:23:52,044 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2023-04-02 22:23:52,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-04-02 22:23:52,044 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:23:52,044 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:23:52,045 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-02 22:23:52,045 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:23:52,045 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:23:52,046 INFO L85 PathProgramCache]: Analyzing trace with hash 1360806907, now seen corresponding path program 1 times [2023-04-02 22:23:52,046 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:23:52,046 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016138090] [2023-04-02 22:23:52,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:23:52,046 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:23:52,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:23:52,119 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:23:52,119 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:23:52,119 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016138090] [2023-04-02 22:23:52,119 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2016138090] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:23:52,119 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:23:52,120 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-02 22:23:52,120 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748331374] [2023-04-02 22:23:52,120 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:23:52,120 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 22:23:52,120 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:23:52,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 22:23:52,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 22:23:52,121 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:23:52,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:23:52,160 INFO L93 Difference]: Finished difference Result 43 states and 49 transitions. [2023-04-02 22:23:52,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 22:23:52,160 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 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 11 [2023-04-02 22:23:52,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:23:52,161 INFO L225 Difference]: With dead ends: 43 [2023-04-02 22:23:52,161 INFO L226 Difference]: Without dead ends: 26 [2023-04-02 22:23:52,162 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 22:23:52,163 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 1 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:23:52,163 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 29 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:23:52,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-04-02 22:23:52,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2023-04-02 22:23:52,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 22:23:52,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2023-04-02 22:23:52,169 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 11 [2023-04-02 22:23:52,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:23:52,169 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2023-04-02 22:23:52,169 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:23:52,169 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2023-04-02 22:23:52,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-02 22:23:52,170 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:23:52,170 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:23:52,170 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-04-02 22:23:52,170 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:23:52,171 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:23:52,171 INFO L85 PathProgramCache]: Analyzing trace with hash 452630595, now seen corresponding path program 1 times [2023-04-02 22:23:52,171 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:23:52,171 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [227227585] [2023-04-02 22:23:52,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:23:52,171 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:23:52,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:23:52,278 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:23:52,278 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:23:52,279 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [227227585] [2023-04-02 22:23:52,279 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [227227585] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:23:52,279 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1110486832] [2023-04-02 22:23:52,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:23:52,280 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:23:52,281 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:23:52,283 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:23:52,290 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-02 22:23:52,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:23:52,354 INFO L262 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 5 conjunts are in the unsatisfiable core [2023-04-02 22:23:52,359 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:23:52,392 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:23:52,392 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:23:52,450 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:23:52,450 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1110486832] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:23:52,450 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1218535955] [2023-04-02 22:23:52,477 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:23:52,477 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:23:52,484 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:23:52,488 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:23:52,489 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:23:52,576 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:23:52,803 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-04-02 22:23:52,809 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:23:52,815 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:23:53,132 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '427#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 22:23:53,133 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:23:53,133 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:23:53,133 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-02 22:23:53,135 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080311160] [2023-04-02 22:23:53,136 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:23:53,136 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-02 22:23:53,139 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:23:53,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-02 22:23:53,141 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2023-04-02 22:23:53,141 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 22:23:53,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:23:53,218 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2023-04-02 22:23:53,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 22:23:53,218 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 18 [2023-04-02 22:23:53,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:23:53,220 INFO L225 Difference]: With dead ends: 51 [2023-04-02 22:23:53,221 INFO L226 Difference]: Without dead ends: 33 [2023-04-02 22:23:53,221 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2023-04-02 22:23:53,224 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 4 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:23:53,225 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 57 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:23:53,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-04-02 22:23:53,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2023-04-02 22:23:53,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 22 states have internal predecessors, (24), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-02 22:23:53,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2023-04-02 22:23:53,245 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 18 [2023-04-02 22:23:53,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:23:53,246 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2023-04-02 22:23:53,246 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 22:23:53,247 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2023-04-02 22:23:53,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-04-02 22:23:53,248 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:23:53,249 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:23:53,259 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-02 22:23:53,456 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:23:53,457 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:23:53,457 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:23:53,457 INFO L85 PathProgramCache]: Analyzing trace with hash 186008059, now seen corresponding path program 2 times [2023-04-02 22:23:53,457 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:23:53,458 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [746531620] [2023-04-02 22:23:53,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:23:53,458 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:23:53,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:23:53,652 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 8 proven. 22 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-04-02 22:23:53,653 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:23:53,654 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [746531620] [2023-04-02 22:23:53,656 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [746531620] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:23:53,656 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [647856322] [2023-04-02 22:23:53,656 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:23:53,657 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:23:53,657 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:23:53,658 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:23:53,660 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-02 22:23:53,730 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-02 22:23:53,731 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:23:53,732 INFO L262 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-02 22:23:53,734 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:23:53,900 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-04-02 22:23:53,900 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 22:23:53,900 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [647856322] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:23:53,900 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-02 22:23:53,900 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7] total 12 [2023-04-02 22:23:53,900 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156941974] [2023-04-02 22:23:53,901 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:23:53,902 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-02 22:23:53,902 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:23:53,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-02 22:23:53,902 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2023-04-02 22:23:53,903 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-04-02 22:23:54,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:23:54,038 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2023-04-02 22:23:54,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-02 22:23:54,039 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 39 [2023-04-02 22:23:54,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:23:54,039 INFO L225 Difference]: With dead ends: 39 [2023-04-02 22:23:54,040 INFO L226 Difference]: Without dead ends: 35 [2023-04-02 22:23:54,040 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2023-04-02 22:23:54,040 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 10 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:23:54,041 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 71 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:23:54,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-04-02 22:23:54,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2023-04-02 22:23:54,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 8 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-02 22:23:54,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2023-04-02 22:23:54,073 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 39 [2023-04-02 22:23:54,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:23:54,073 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2023-04-02 22:23:54,073 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-04-02 22:23:54,073 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2023-04-02 22:23:54,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-04-02 22:23:54,074 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:23:54,074 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:23:54,081 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-04-02 22:23:54,275 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:23:54,275 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:23:54,276 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:23:54,276 INFO L85 PathProgramCache]: Analyzing trace with hash -1470815926, now seen corresponding path program 1 times [2023-04-02 22:23:54,276 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:23:54,276 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1482116193] [2023-04-02 22:23:54,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:23:54,276 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:23:54,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:23:54,407 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 11 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-04-02 22:23:54,407 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:23:54,407 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1482116193] [2023-04-02 22:23:54,407 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1482116193] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:23:54,408 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [760490808] [2023-04-02 22:23:54,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:23:54,408 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:23:54,408 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:23:54,409 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:23:54,411 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-02 22:23:54,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:23:54,471 INFO L262 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-02 22:23:54,474 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:23:54,536 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-04-02 22:23:54,536 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:23:54,653 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-04-02 22:23:54,653 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [760490808] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:23:54,654 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [873992805] [2023-04-02 22:23:54,658 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 22:23:54,658 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:23:54,659 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:23:54,659 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:23:54,659 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:23:54,689 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:23:55,060 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-04-02 22:23:55,064 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:23:55,071 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:23:55,470 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1101#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 22:23:55,470 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:23:55,470 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:23:55,470 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 15 [2023-04-02 22:23:55,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476033428] [2023-04-02 22:23:55,470 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:23:55,471 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-04-02 22:23:55,471 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:23:55,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-04-02 22:23:55,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2023-04-02 22:23:55,472 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 15 states have internal predecessors, (40), 10 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2023-04-02 22:23:56,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:23:56,021 INFO L93 Difference]: Finished difference Result 132 states and 173 transitions. [2023-04-02 22:23:56,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-04-02 22:23:56,022 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 15 states have internal predecessors, (40), 10 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) Word has length 46 [2023-04-02 22:23:56,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:23:56,023 INFO L225 Difference]: With dead ends: 132 [2023-04-02 22:23:56,023 INFO L226 Difference]: Without dead ends: 103 [2023-04-02 22:23:56,024 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 503 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=332, Invalid=1738, Unknown=0, NotChecked=0, Total=2070 [2023-04-02 22:23:56,025 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 62 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 228 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 228 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:23:56,025 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 120 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 228 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:23:56,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2023-04-02 22:23:56,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 95. [2023-04-02 22:23:56,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 64 states have (on average 1.078125) internal successors, (69), 64 states have internal predecessors, (69), 27 states have call successors, (27), 5 states have call predecessors, (27), 3 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2023-04-02 22:23:56,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 121 transitions. [2023-04-02 22:23:56,047 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 121 transitions. Word has length 46 [2023-04-02 22:23:56,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:23:56,047 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 121 transitions. [2023-04-02 22:23:56,048 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 15 states have internal predecessors, (40), 10 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2023-04-02 22:23:56,048 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 121 transitions. [2023-04-02 22:23:56,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2023-04-02 22:23:56,051 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:23:56,055 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 24, 20, 20, 20, 20, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:23:56,063 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-02 22:23:56,260 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:23:56,262 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:23:56,262 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:23:56,262 INFO L85 PathProgramCache]: Analyzing trace with hash -1659286991, now seen corresponding path program 2 times [2023-04-02 22:23:56,263 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:23:56,263 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [663689493] [2023-04-02 22:23:56,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:23:56,263 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:23:56,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:23:56,649 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 310 proven. 35 refuted. 0 times theorem prover too weak. 1485 trivial. 0 not checked. [2023-04-02 22:23:56,649 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:23:56,650 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [663689493] [2023-04-02 22:23:56,650 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [663689493] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:23:56,650 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1492441679] [2023-04-02 22:23:56,650 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:23:56,650 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:23:56,650 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:23:56,651 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:23:56,654 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-02 22:23:57,289 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2023-04-02 22:23:57,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:23:57,291 INFO L262 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 16 conjunts are in the unsatisfiable core [2023-04-02 22:23:57,296 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:23:57,366 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 406 proven. 35 refuted. 0 times theorem prover too weak. 1389 trivial. 0 not checked. [2023-04-02 22:23:57,366 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:23:57,619 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 316 proven. 35 refuted. 0 times theorem prover too weak. 1479 trivial. 0 not checked. [2023-04-02 22:23:57,620 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1492441679] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:23:57,620 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [483448394] [2023-04-02 22:23:57,622 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 22:23:57,622 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:23:57,622 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:23:57,623 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:23:57,623 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:23:57,639 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:23:58,102 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-04-02 22:23:58,105 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:23:58,109 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:23:58,879 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2625#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 22:23:58,880 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:23:58,880 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:23:58,880 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 16 [2023-04-02 22:23:58,880 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805175586] [2023-04-02 22:23:58,880 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:23:58,881 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-04-02 22:23:58,881 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:23:58,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-04-02 22:23:58,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=530, Unknown=0, NotChecked=0, Total=650 [2023-04-02 22:23:58,882 INFO L87 Difference]: Start difference. First operand 95 states and 121 transitions. Second operand has 16 states, 16 states have (on average 2.9375) internal successors, (47), 16 states have internal predecessors, (47), 12 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 12 states have call predecessors, (16), 12 states have call successors, (16) [2023-04-02 22:23:59,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:23:59,674 INFO L93 Difference]: Finished difference Result 252 states and 354 transitions. [2023-04-02 22:23:59,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-04-02 22:23:59,675 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.9375) internal successors, (47), 16 states have internal predecessors, (47), 12 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 12 states have call predecessors, (16), 12 states have call successors, (16) Word has length 182 [2023-04-02 22:23:59,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:23:59,679 INFO L225 Difference]: With dead ends: 252 [2023-04-02 22:23:59,679 INFO L226 Difference]: Without dead ends: 179 [2023-04-02 22:23:59,682 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 561 GetRequests, 510 SyntacticMatches, 21 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 438 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=214, Invalid=778, Unknown=0, NotChecked=0, Total=992 [2023-04-02 22:23:59,683 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 16 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:23:59,683 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 134 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:23:59,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2023-04-02 22:23:59,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2023-04-02 22:23:59,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 120 states have (on average 1.0416666666666667) internal successors, (125), 120 states have internal predecessors, (125), 55 states have call successors, (55), 5 states have call predecessors, (55), 3 states have return successors, (53), 53 states have call predecessors, (53), 53 states have call successors, (53) [2023-04-02 22:23:59,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 233 transitions. [2023-04-02 22:23:59,737 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 233 transitions. Word has length 182 [2023-04-02 22:23:59,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:23:59,737 INFO L495 AbstractCegarLoop]: Abstraction has 179 states and 233 transitions. [2023-04-02 22:23:59,737 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.9375) internal successors, (47), 16 states have internal predecessors, (47), 12 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 12 states have call predecessors, (16), 12 states have call successors, (16) [2023-04-02 22:23:59,737 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 233 transitions. [2023-04-02 22:23:59,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 379 [2023-04-02 22:23:59,751 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:23:59,751 INFO L195 NwaCegarLoop]: trace histogram [53, 52, 52, 48, 48, 48, 48, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:23:59,759 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-02 22:23:59,956 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:23:59,957 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:23:59,957 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:23:59,957 INFO L85 PathProgramCache]: Analyzing trace with hash 471985621, now seen corresponding path program 3 times [2023-04-02 22:23:59,957 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:23:59,957 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1144514913] [2023-04-02 22:23:59,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:23:59,958 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:24:00,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:24:00,950 INFO L134 CoverageAnalysis]: Checked inductivity of 9012 backedges. 1479 proven. 210 refuted. 0 times theorem prover too weak. 7323 trivial. 0 not checked. [2023-04-02 22:24:00,950 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:24:00,950 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1144514913] [2023-04-02 22:24:00,950 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1144514913] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:24:00,951 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1072483138] [2023-04-02 22:24:00,951 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:24:00,951 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:24:00,951 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:24:00,952 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:24:00,954 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-02 22:24:01,143 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:24:01,144 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:24:01,148 INFO L262 TraceCheckSpWp]: Trace formula consists of 836 conjuncts, 22 conjunts are in the unsatisfiable core [2023-04-02 22:24:01,195 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:24:01,590 INFO L134 CoverageAnalysis]: Checked inductivity of 9012 backedges. 104 proven. 2890 refuted. 0 times theorem prover too weak. 6018 trivial. 0 not checked. [2023-04-02 22:24:01,590 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:24:02,223 INFO L134 CoverageAnalysis]: Checked inductivity of 9012 backedges. 208 proven. 2786 refuted. 0 times theorem prover too weak. 6018 trivial. 0 not checked. [2023-04-02 22:24:02,223 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1072483138] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:24:02,223 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1175212040] [2023-04-02 22:24:02,226 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 22:24:02,226 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:24:02,226 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:24:02,226 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:24:02,226 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:24:02,240 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:24:02,467 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-04-02 22:24:02,469 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:24:02,472 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:24:03,011 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5658#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 22:24:03,011 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:24:03,011 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:24:03,012 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12, 12] total 35 [2023-04-02 22:24:03,012 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650216088] [2023-04-02 22:24:03,012 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:24:03,013 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-04-02 22:24:03,013 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:24:03,014 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-04-02 22:24:03,014 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=1833, Unknown=0, NotChecked=0, Total=2070 [2023-04-02 22:24:03,015 INFO L87 Difference]: Start difference. First operand 179 states and 233 transitions. Second operand has 35 states, 35 states have (on average 2.914285714285714) internal successors, (102), 35 states have internal predecessors, (102), 30 states have call successors, (41), 2 states have call predecessors, (41), 1 states have return successors, (39), 30 states have call predecessors, (39), 30 states have call successors, (39) [2023-04-02 22:24:11,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:24:11,275 INFO L93 Difference]: Finished difference Result 605 states and 820 transitions. [2023-04-02 22:24:11,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 146 states. [2023-04-02 22:24:11,275 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.914285714285714) internal successors, (102), 35 states have internal predecessors, (102), 30 states have call successors, (41), 2 states have call predecessors, (41), 1 states have return successors, (39), 30 states have call predecessors, (39), 30 states have call successors, (39) Word has length 378 [2023-04-02 22:24:11,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:24:11,279 INFO L225 Difference]: With dead ends: 605 [2023-04-02 22:24:11,279 INFO L226 Difference]: Without dead ends: 469 [2023-04-02 22:24:11,290 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1282 GetRequests, 1105 SyntacticMatches, 0 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11197 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=3455, Invalid=28407, Unknown=0, NotChecked=0, Total=31862 [2023-04-02 22:24:11,291 INFO L413 NwaCegarLoop]: 140 mSDtfsCounter, 227 mSDsluCounter, 859 mSDsCounter, 0 mSdLazyCounter, 3658 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 999 SdHoareTripleChecker+Invalid, 3785 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 3658 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2023-04-02 22:24:11,291 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [231 Valid, 999 Invalid, 3785 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 3658 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2023-04-02 22:24:11,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 469 states. [2023-04-02 22:24:11,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 469 to 449. [2023-04-02 22:24:11,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 449 states, 302 states have (on average 1.0364238410596027) internal successors, (313), 302 states have internal predecessors, (313), 143 states have call successors, (143), 5 states have call predecessors, (143), 3 states have return successors, (141), 141 states have call predecessors, (141), 141 states have call successors, (141) [2023-04-02 22:24:11,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 597 transitions. [2023-04-02 22:24:11,367 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 597 transitions. Word has length 378 [2023-04-02 22:24:11,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:24:11,367 INFO L495 AbstractCegarLoop]: Abstraction has 449 states and 597 transitions. [2023-04-02 22:24:11,368 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.914285714285714) internal successors, (102), 35 states have internal predecessors, (102), 30 states have call successors, (41), 2 states have call predecessors, (41), 1 states have return successors, (39), 30 states have call predecessors, (39), 30 states have call successors, (39) [2023-04-02 22:24:11,368 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 597 transitions. [2023-04-02 22:24:11,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1001 [2023-04-02 22:24:11,391 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:24:11,392 INFO L195 NwaCegarLoop]: trace histogram [141, 140, 140, 130, 130, 130, 130, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:24:11,398 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-02 22:24:11,598 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:24:11,599 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:24:11,599 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:24:11,599 INFO L85 PathProgramCache]: Analyzing trace with hash 1738781521, now seen corresponding path program 4 times [2023-04-02 22:24:11,599 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:24:11,599 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [505023705] [2023-04-02 22:24:11,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:24:11,600 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:24:12,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:24:14,415 INFO L134 CoverageAnalysis]: Checked inductivity of 65845 backedges. 5096 proven. 247 refuted. 0 times theorem prover too weak. 60502 trivial. 0 not checked. [2023-04-02 22:24:14,415 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:24:14,415 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [505023705] [2023-04-02 22:24:14,415 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [505023705] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:24:14,416 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1046190265] [2023-04-02 22:24:14,416 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:24:14,416 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:24:14,416 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:24:14,417 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:24:14,447 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-02 22:24:14,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:24:14,891 INFO L262 TraceCheckSpWp]: Trace formula consists of 2156 conjuncts, 46 conjunts are in the unsatisfiable core [2023-04-02 22:24:14,912 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:24:15,864 INFO L134 CoverageAnalysis]: Checked inductivity of 65845 backedges. 280 proven. 24413 refuted. 0 times theorem prover too weak. 41152 trivial. 0 not checked. [2023-04-02 22:24:15,865 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:24:17,689 INFO L134 CoverageAnalysis]: Checked inductivity of 65845 backedges. 373 proven. 24320 refuted. 0 times theorem prover too weak. 41152 trivial. 0 not checked. [2023-04-02 22:24:17,690 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1046190265] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:24:17,690 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1888036194] [2023-04-02 22:24:17,692 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 22:24:17,692 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:24:17,693 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:24:17,693 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:24:17,693 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:24:17,719 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:24:18,062 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-04-02 22:24:18,065 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:24:18,068 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:24:25,344 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13741#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 22:24:25,344 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:24:25,344 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:24:25,344 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 24, 24] total 60 [2023-04-02 22:24:25,345 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983160301] [2023-04-02 22:24:25,345 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:24:25,348 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2023-04-02 22:24:25,348 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:24:25,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2023-04-02 22:24:25,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=690, Invalid=4140, Unknown=0, NotChecked=0, Total=4830 [2023-04-02 22:24:25,352 INFO L87 Difference]: Start difference. First operand 449 states and 597 transitions. Second operand has 60 states, 60 states have (on average 3.1333333333333333) internal successors, (188), 60 states have internal predecessors, (188), 55 states have call successors, (78), 2 states have call predecessors, (78), 1 states have return successors, (76), 55 states have call predecessors, (76), 55 states have call successors, (76) [2023-04-02 22:26:50,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:26:50,771 INFO L93 Difference]: Finished difference Result 1478 states and 2018 transitions. [2023-04-02 22:26:50,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 342 states. [2023-04-02 22:26:50,772 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 3.1333333333333333) internal successors, (188), 60 states have internal predecessors, (188), 55 states have call successors, (78), 2 states have call predecessors, (78), 1 states have return successors, (76), 55 states have call predecessors, (76), 55 states have call successors, (76) Word has length 1000 [2023-04-02 22:26:50,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:26:50,778 INFO L225 Difference]: With dead ends: 1478 [2023-04-02 22:26:50,778 INFO L226 Difference]: Without dead ends: 1075 [2023-04-02 22:26:50,801 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3333 GetRequests, 2818 SyntacticMatches, 130 SemanticMatches, 385 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64874 ImplicationChecksByTransitivity, 147.9s TimeCoverageRelationStatistics Valid=15797, Invalid=133585, Unknown=0, NotChecked=0, Total=149382 [2023-04-02 22:26:50,802 INFO L413 NwaCegarLoop]: 318 mSDtfsCounter, 415 mSDsluCounter, 5248 mSDsCounter, 0 mSdLazyCounter, 14735 mSolverCounterSat, 240 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 419 SdHoareTripleChecker+Valid, 5566 SdHoareTripleChecker+Invalid, 14975 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 240 IncrementalHoareTripleChecker+Valid, 14735 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.5s IncrementalHoareTripleChecker+Time [2023-04-02 22:26:50,802 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [419 Valid, 5566 Invalid, 14975 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [240 Valid, 14735 Invalid, 0 Unknown, 0 Unchecked, 5.5s Time] [2023-04-02 22:26:50,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1075 states. [2023-04-02 22:26:50,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1075 to 1031. [2023-04-02 22:26:50,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1031 states, 694 states have (on average 1.0331412103746398) internal successors, (717), 694 states have internal predecessors, (717), 333 states have call successors, (333), 5 states have call predecessors, (333), 3 states have return successors, (331), 331 states have call predecessors, (331), 331 states have call successors, (331) [2023-04-02 22:26:50,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1031 states to 1031 states and 1381 transitions. [2023-04-02 22:26:50,965 INFO L78 Accepts]: Start accepts. Automaton has 1031 states and 1381 transitions. Word has length 1000 [2023-04-02 22:26:50,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:26:50,965 INFO L495 AbstractCegarLoop]: Abstraction has 1031 states and 1381 transitions. [2023-04-02 22:26:50,966 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 3.1333333333333333) internal successors, (188), 60 states have internal predecessors, (188), 55 states have call successors, (78), 2 states have call predecessors, (78), 1 states have return successors, (76), 55 states have call predecessors, (76), 55 states have call successors, (76) [2023-04-02 22:26:50,966 INFO L276 IsEmpty]: Start isEmpty. Operand 1031 states and 1381 transitions. [2023-04-02 22:26:51,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2343 [2023-04-02 22:26:51,101 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:26:51,102 INFO L195 NwaCegarLoop]: trace histogram [331, 330, 330, 308, 308, 308, 308, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:26:51,110 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-04-02 22:26:51,302 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:26:51,303 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:26:51,303 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:26:51,303 INFO L85 PathProgramCache]: Analyzing trace with hash 733030231, now seen corresponding path program 5 times [2023-04-02 22:26:51,304 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:26:51,304 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1025019799] [2023-04-02 22:26:51,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:26:51,304 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:26:54,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:26:58,118 INFO L134 CoverageAnalysis]: Checked inductivity of 367356 backedges. 13639 proven. 287 refuted. 0 times theorem prover too weak. 353430 trivial. 0 not checked. [2023-04-02 22:26:58,118 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:26:58,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1025019799] [2023-04-02 22:26:58,119 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1025019799] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:26:58,119 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1056960726] [2023-04-02 22:26:58,119 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:26:58,119 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:26:58,119 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:26:58,121 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:26:58,127 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-02 22:27:06,781 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2023-04-02 22:27:06,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:27:06,795 INFO L262 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 36 conjunts are in the unsatisfiable core [2023-04-02 22:27:06,823 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:27:06,995 INFO L134 CoverageAnalysis]: Checked inductivity of 367356 backedges. 14995 proven. 287 refuted. 0 times theorem prover too weak. 352074 trivial. 0 not checked. [2023-04-02 22:27:06,996 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:27:08,428 INFO L134 CoverageAnalysis]: Checked inductivity of 367356 backedges. 14668 proven. 287 refuted. 0 times theorem prover too weak. 352401 trivial. 0 not checked. [2023-04-02 22:27:08,429 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1056960726] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:27:08,429 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1245147615] [2023-04-02 22:27:08,434 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 22:27:08,434 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:27:08,434 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:27:08,435 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:27:08,435 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:27:08,448 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:27:08,703 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-04-02 22:27:08,706 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:27:08,710 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:27:09,226 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32650#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 22:27:09,227 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:27:09,227 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:27:09,228 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 20] total 36 [2023-04-02 22:27:09,228 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148112704] [2023-04-02 22:27:09,228 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:27:09,233 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-04-02 22:27:09,234 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:27:09,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-04-02 22:27:09,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=1780, Unknown=0, NotChecked=0, Total=2162 [2023-04-02 22:27:09,235 INFO L87 Difference]: Start difference. First operand 1031 states and 1381 transitions. Second operand has 36 states, 35 states have (on average 2.4571428571428573) internal successors, (86), 36 states have internal predecessors, (86), 31 states have call successors, (37), 2 states have call predecessors, (37), 3 states have return successors, (35), 30 states have call predecessors, (35), 31 states have call successors, (35) [2023-04-02 22:27:44,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:27:44,136 INFO L93 Difference]: Finished difference Result 3091 states and 4502 transitions. [2023-04-02 22:27:44,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2023-04-02 22:27:44,137 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 2.4571428571428573) internal successors, (86), 36 states have internal predecessors, (86), 31 states have call successors, (37), 2 states have call predecessors, (37), 3 states have return successors, (35), 30 states have call predecessors, (35), 31 states have call successors, (35) Word has length 2342 [2023-04-02 22:27:44,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:27:44,148 INFO L225 Difference]: With dead ends: 3091 [2023-04-02 22:27:44,149 INFO L226 Difference]: Without dead ends: 2087 [2023-04-02 22:27:44,153 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7059 GetRequests, 6998 SyntacticMatches, 1 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 586 ImplicationChecksByTransitivity, 35.1s TimeCoverageRelationStatistics Valid=871, Invalid=2911, Unknown=0, NotChecked=0, Total=3782 [2023-04-02 22:27:44,153 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 33 mSDsluCounter, 346 mSDsCounter, 0 mSdLazyCounter, 803 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 372 SdHoareTripleChecker+Invalid, 844 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 803 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-02 22:27:44,154 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 372 Invalid, 844 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 803 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-04-02 22:27:44,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2087 states. [2023-04-02 22:27:44,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2087 to 2087. [2023-04-02 22:27:44,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2087 states, 1398 states have (on average 1.0164520743919885) internal successors, (1421), 1398 states have internal predecessors, (1421), 685 states have call successors, (685), 5 states have call predecessors, (685), 3 states have return successors, (683), 683 states have call predecessors, (683), 683 states have call successors, (683) [2023-04-02 22:27:44,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2087 states to 2087 states and 2789 transitions. [2023-04-02 22:27:44,503 INFO L78 Accepts]: Start accepts. Automaton has 2087 states and 2789 transitions. Word has length 2342 [2023-04-02 22:27:44,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:27:44,504 INFO L495 AbstractCegarLoop]: Abstraction has 2087 states and 2789 transitions. [2023-04-02 22:27:44,504 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 2.4571428571428573) internal successors, (86), 36 states have internal predecessors, (86), 31 states have call successors, (37), 2 states have call predecessors, (37), 3 states have return successors, (35), 30 states have call predecessors, (35), 31 states have call successors, (35) [2023-04-02 22:27:44,504 INFO L276 IsEmpty]: Start isEmpty. Operand 2087 states and 2789 transitions. [2023-04-02 22:27:44,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4807 [2023-04-02 22:27:44,645 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:27:44,646 INFO L195 NwaCegarLoop]: trace histogram [683, 682, 682, 660, 660, 660, 660, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:27:44,655 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-04-02 22:27:44,854 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:27:44,855 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:27:44,855 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:27:44,856 INFO L85 PathProgramCache]: Analyzing trace with hash 165406039, now seen corresponding path program 6 times [2023-04-02 22:27:44,856 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:27:44,856 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [159638332] [2023-04-02 22:27:44,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:27:44,857 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:27:53,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat