/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/array-patterns/array4_pattern.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 15:12:23,805 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 15:12:23,807 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 15:12:23,848 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 15:12:23,848 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 15:12:23,851 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 15:12:23,854 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 15:12:23,856 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 15:12:23,857 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 15:12:23,862 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 15:12:23,863 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 15:12:23,864 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 15:12:23,865 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 15:12:23,867 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 15:12:23,868 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 15:12:23,869 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 15:12:23,869 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 15:12:23,870 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 15:12:23,872 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 15:12:23,876 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 15:12:23,877 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 15:12:23,878 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 15:12:23,878 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 15:12:23,880 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 15:12:23,885 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-02 15:12:23,885 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-02 15:12:23,885 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-02 15:12:23,885 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-02 15:12:23,886 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-02 15:12:23,886 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-02 15:12:23,886 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 15:12:23,887 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 15:12:23,887 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 15:12:23,888 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 15:12:23,888 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 15:12:23,888 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 15:12:23,889 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 15:12:23,889 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 15:12:23,889 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 15:12:23,890 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 15:12:23,890 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 15:12:23,892 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-02 15:12:23,910 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 15:12:23,910 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 15:12:23,911 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 15:12:23,911 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 15:12:23,911 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 15:12:23,911 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 15:12:23,912 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 15:12:23,912 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 15:12:23,912 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 15:12:23,912 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 15:12:23,912 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 15:12:23,912 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 15:12:23,912 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 15:12:23,915 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 15:12:23,915 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 15:12:23,915 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 15:12:23,915 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 15:12:23,916 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 15:12:23,916 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 15:12:23,916 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 15:12:23,916 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 15:12:23,916 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 15:12:23,916 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 15:12:23,917 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 15:12:23,917 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 15:12:23,917 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 15:12:23,917 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 15:12:23,917 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 15:12:23,918 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 15:12:23,918 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 15:12:23,918 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 15:12:23,918 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 15:12:23,918 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 15:12:23,918 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 15:12:23,919 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 15:12:23,919 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 15:12:23,919 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 15:12:23,919 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 15:12:23,920 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 15:12:23,920 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 15:12:23,920 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 15:12:23,920 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 15:12:24,149 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 15:12:24,167 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 15:12:24,170 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 15:12:24,171 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 15:12:24,172 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 15:12:24,173 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-patterns/array4_pattern.c [2023-04-02 15:12:25,293 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 15:12:25,481 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 15:12:25,481 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-patterns/array4_pattern.c [2023-04-02 15:12:25,487 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6ca8b5d90/db448ed622ed4dbfbe4fb1fe9e536c99/FLAGe6decaf7b [2023-04-02 15:12:25,501 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6ca8b5d90/db448ed622ed4dbfbe4fb1fe9e536c99 [2023-04-02 15:12:25,504 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 15:12:25,505 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 15:12:25,508 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 15:12:25,509 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 15:12:25,511 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 15:12:25,512 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 03:12:25" (1/1) ... [2023-04-02 15:12:25,513 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@17dc36e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:12:25, skipping insertion in model container [2023-04-02 15:12:25,513 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 03:12:25" (1/1) ... [2023-04-02 15:12:25,519 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 15:12:25,533 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 15:12:25,645 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-patterns/array4_pattern.c[1835,1848] [2023-04-02 15:12:25,672 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 15:12:25,678 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 15:12:25,687 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-patterns/array4_pattern.c[1835,1848] [2023-04-02 15:12:25,697 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 15:12:25,711 INFO L208 MainTranslator]: Completed translation [2023-04-02 15:12:25,711 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:12:25 WrapperNode [2023-04-02 15:12:25,711 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 15:12:25,712 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 15:12:25,712 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 15:12:25,712 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 15:12:25,722 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:12:25" (1/1) ... [2023-04-02 15:12:25,722 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:12:25" (1/1) ... [2023-04-02 15:12:25,728 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:12:25" (1/1) ... [2023-04-02 15:12:25,729 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:12:25" (1/1) ... [2023-04-02 15:12:25,750 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:12:25" (1/1) ... [2023-04-02 15:12:25,753 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:12:25" (1/1) ... [2023-04-02 15:12:25,754 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:12:25" (1/1) ... [2023-04-02 15:12:25,755 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:12:25" (1/1) ... [2023-04-02 15:12:25,757 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 15:12:25,758 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 15:12:25,758 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 15:12:25,758 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 15:12:25,759 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:12:25" (1/1) ... [2023-04-02 15:12:25,764 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 15:12:25,772 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:12:25,793 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-02 15:12:25,819 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-02 15:12:25,833 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 15:12:25,833 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 15:12:25,833 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 15:12:25,833 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-02 15:12:25,833 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 15:12:25,833 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 15:12:25,833 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 15:12:25,833 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 15:12:25,834 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 15:12:25,834 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 15:12:25,834 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-02 15:12:25,834 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 15:12:25,834 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 15:12:25,834 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2023-04-02 15:12:25,834 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 15:12:25,834 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-02 15:12:25,834 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 15:12:25,834 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 15:12:25,835 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 15:12:25,835 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 15:12:25,835 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 15:12:25,835 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 15:12:25,889 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 15:12:25,890 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 15:12:26,046 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 15:12:26,140 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 15:12:26,140 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-04-02 15:12:26,142 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 03:12:26 BoogieIcfgContainer [2023-04-02 15:12:26,142 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 15:12:26,144 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 15:12:26,144 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 15:12:26,151 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 15:12:26,151 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 03:12:25" (1/3) ... [2023-04-02 15:12:26,152 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35bc0fa3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 03:12:26, skipping insertion in model container [2023-04-02 15:12:26,152 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:12:25" (2/3) ... [2023-04-02 15:12:26,152 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35bc0fa3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 03:12:26, skipping insertion in model container [2023-04-02 15:12:26,152 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 03:12:26" (3/3) ... [2023-04-02 15:12:26,153 INFO L112 eAbstractionObserver]: Analyzing ICFG array4_pattern.c [2023-04-02 15:12:26,168 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 15:12:26,168 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 15:12:26,219 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 15:12:26,224 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;@6c90a1fc, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 15:12:26,224 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 15:12:26,228 INFO L276 IsEmpty]: Start isEmpty. Operand has 32 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-04-02 15:12:26,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-04-02 15:12:26,234 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:12:26,234 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:12:26,235 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:12:26,239 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:12:26,239 INFO L85 PathProgramCache]: Analyzing trace with hash -1503398764, now seen corresponding path program 1 times [2023-04-02 15:12:26,247 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:12:26,247 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [37964633] [2023-04-02 15:12:26,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:12:26,248 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:12:26,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:12:26,424 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 15:12:26,426 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:12:26,426 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [37964633] [2023-04-02 15:12:26,427 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [37964633] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 15:12:26,427 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 15:12:26,427 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-04-02 15:12:26,448 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201868409] [2023-04-02 15:12:26,449 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 15:12:26,452 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-04-02 15:12:26,452 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:12:26,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-04-02 15:12:26,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-04-02 15:12:26,490 INFO L87 Difference]: Start difference. First operand has 32 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:12:26,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:12:26,561 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2023-04-02 15:12:26,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-04-02 15:12:26,563 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2023-04-02 15:12:26,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:12:26,568 INFO L225 Difference]: With dead ends: 45 [2023-04-02 15:12:26,569 INFO L226 Difference]: Without dead ends: 26 [2023-04-02 15:12:26,571 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-04-02 15:12:26,573 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:12:26,574 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 30 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:12:26,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-04-02 15:12:26,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-04-02 15:12:26,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 8 states have call successors, (8), 4 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-02 15:12:26,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2023-04-02 15:12:26,609 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 17 [2023-04-02 15:12:26,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:12:26,610 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2023-04-02 15:12:26,610 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:12:26,610 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2023-04-02 15:12:26,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-04-02 15:12:26,612 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:12:26,612 INFO L195 NwaCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:12:26,612 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 15:12:26,612 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:12:26,613 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:12:26,613 INFO L85 PathProgramCache]: Analyzing trace with hash 1007309007, now seen corresponding path program 1 times [2023-04-02 15:12:26,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:12:26,613 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2061507642] [2023-04-02 15:12:26,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:12:26,614 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:12:26,651 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:12:26,651 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1399863515] [2023-04-02 15:12:26,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:12:26,651 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:12:26,652 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:12:26,654 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:12:26,655 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-02 15:12:26,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:12:26,742 INFO L262 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-02 15:12:26,747 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:12:26,812 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 15:12:26,812 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 15:12:26,813 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:12:26,813 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2061507642] [2023-04-02 15:12:26,813 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:12:26,813 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1399863515] [2023-04-02 15:12:26,813 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1399863515] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 15:12:26,813 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 15:12:26,813 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-02 15:12:26,814 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025721752] [2023-04-02 15:12:26,814 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 15:12:26,815 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 15:12:26,815 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:12:26,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 15:12:26,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-02 15:12:26,816 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-04-02 15:12:26,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:12:26,869 INFO L93 Difference]: Finished difference Result 32 states and 38 transitions. [2023-04-02 15:12:26,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-02 15:12:26,870 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 33 [2023-04-02 15:12:26,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:12:26,872 INFO L225 Difference]: With dead ends: 32 [2023-04-02 15:12:26,872 INFO L226 Difference]: Without dead ends: 27 [2023-04-02 15:12:26,873 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-04-02 15:12:26,876 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 3 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 15:12:26,877 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 81 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 15:12:26,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-04-02 15:12:26,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2023-04-02 15:12:26,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 8 states have call successors, (8), 4 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-02 15:12:26,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2023-04-02 15:12:26,891 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 33 [2023-04-02 15:12:26,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:12:26,891 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2023-04-02 15:12:26,891 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-04-02 15:12:26,892 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2023-04-02 15:12:26,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-04-02 15:12:26,893 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:12:26,893 INFO L195 NwaCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:12:26,901 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-04-02 15:12:27,099 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:12:27,099 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:12:27,100 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:12:27,100 INFO L85 PathProgramCache]: Analyzing trace with hash 1086702174, now seen corresponding path program 1 times [2023-04-02 15:12:27,100 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:12:27,100 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [759557906] [2023-04-02 15:12:27,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:12:27,101 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:12:27,134 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:12:27,135 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [716895022] [2023-04-02 15:12:27,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:12:27,135 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:12:27,135 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:12:27,136 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:12:27,166 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-02 15:12:27,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:12:27,235 INFO L262 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-02 15:12:27,237 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:12:27,319 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 15:12:27,320 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 15:12:27,320 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:12:27,321 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [759557906] [2023-04-02 15:12:27,321 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:12:27,321 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [716895022] [2023-04-02 15:12:27,321 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [716895022] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 15:12:27,322 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 15:12:27,322 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-02 15:12:27,322 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542149919] [2023-04-02 15:12:27,322 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 15:12:27,322 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 15:12:27,323 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:12:27,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 15:12:27,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-04-02 15:12:27,324 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-04-02 15:12:27,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:12:27,403 INFO L93 Difference]: Finished difference Result 47 states and 58 transitions. [2023-04-02 15:12:27,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 15:12:27,404 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 34 [2023-04-02 15:12:27,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:12:27,406 INFO L225 Difference]: With dead ends: 47 [2023-04-02 15:12:27,406 INFO L226 Difference]: Without dead ends: 28 [2023-04-02 15:12:27,407 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2023-04-02 15:12:27,411 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 8 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 15:12:27,413 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 61 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 15:12:27,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-04-02 15:12:27,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2023-04-02 15:12:27,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 8 states have call successors, (8), 4 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-02 15:12:27,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2023-04-02 15:12:27,421 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 34 [2023-04-02 15:12:27,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:12:27,422 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2023-04-02 15:12:27,422 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-04-02 15:12:27,422 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2023-04-02 15:12:27,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-04-02 15:12:27,424 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:12:27,425 INFO L195 NwaCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:12:27,429 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 15:12:27,626 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-04-02 15:12:27,627 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:12:27,627 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:12:27,627 INFO L85 PathProgramCache]: Analyzing trace with hash 1097485325, now seen corresponding path program 1 times [2023-04-02 15:12:27,628 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:12:27,628 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1967218643] [2023-04-02 15:12:27,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:12:27,628 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:12:27,661 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:12:27,661 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [938605771] [2023-04-02 15:12:27,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:12:27,662 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:12:27,662 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:12:27,663 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:12:27,665 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-02 15:12:27,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:12:27,748 INFO L262 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 53 conjunts are in the unsatisfiable core [2023-04-02 15:12:27,755 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:12:27,824 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-04-02 15:12:28,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:12:28,278 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 27 [2023-04-02 15:12:28,286 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2023-04-02 15:12:28,290 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 11 [2023-04-02 15:12:28,305 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 9 [2023-04-02 15:12:28,470 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 15:12:28,472 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 15:12:28,486 INFO L321 Elim1Store]: treesize reduction 28, result has 28.2 percent of original size [2023-04-02 15:12:28,486 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 34 treesize of output 24 [2023-04-02 15:12:28,528 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 15:12:28,528 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:12:28,658 INFO L321 Elim1Store]: treesize reduction 20, result has 64.3 percent of original size [2023-04-02 15:12:28,660 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 110 treesize of output 111 [2023-04-02 15:12:28,683 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 15:12:28,684 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 155 treesize of output 155 [2023-04-02 15:12:28,719 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 15:12:28,719 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 72 treesize of output 72 [2023-04-02 15:12:28,817 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 15:12:28,817 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 85 treesize of output 85 [2023-04-02 15:12:29,912 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-04-02 15:12:29,912 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:12:29,912 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1967218643] [2023-04-02 15:12:29,912 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:12:29,913 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [938605771] [2023-04-02 15:12:29,913 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [938605771] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:12:29,913 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1439024369] [2023-04-02 15:12:29,930 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:12:29,930 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:12:29,933 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:12:29,937 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:12:29,937 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:12:29,990 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:12:30,720 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:12:30,727 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:12:30,728 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:12:30,732 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:12:33,316 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '796#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:12:33,316 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:12:33,316 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:12:33,316 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14] total 27 [2023-04-02 15:12:33,316 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054764096] [2023-04-02 15:12:33,317 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:12:33,317 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-04-02 15:12:33,317 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:12:33,318 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-04-02 15:12:33,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=268, Invalid=2282, Unknown=0, NotChecked=0, Total=2550 [2023-04-02 15:12:33,319 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 27 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 8 states have call successors, (13), 4 states have call predecessors, (13), 5 states have return successors, (11), 6 states have call predecessors, (11), 7 states have call successors, (11) [2023-04-02 15:12:35,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:12:35,962 INFO L93 Difference]: Finished difference Result 88 states and 114 transitions. [2023-04-02 15:12:35,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2023-04-02 15:12:35,962 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 8 states have call successors, (13), 4 states have call predecessors, (13), 5 states have return successors, (11), 6 states have call predecessors, (11), 7 states have call successors, (11) Word has length 35 [2023-04-02 15:12:35,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:12:35,964 INFO L225 Difference]: With dead ends: 88 [2023-04-02 15:12:35,964 INFO L226 Difference]: Without dead ends: 82 [2023-04-02 15:12:35,966 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1686 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=618, Invalid=4784, Unknown=0, NotChecked=0, Total=5402 [2023-04-02 15:12:35,967 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 133 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 602 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 280 SdHoareTripleChecker+Invalid, 724 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 602 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-04-02 15:12:35,967 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [133 Valid, 280 Invalid, 724 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 602 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-04-02 15:12:35,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2023-04-02 15:12:35,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 44. [2023-04-02 15:12:35,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 27 states have internal predecessors, (32), 12 states have call successors, (12), 6 states have call predecessors, (12), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-02 15:12:35,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 54 transitions. [2023-04-02 15:12:35,982 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 54 transitions. Word has length 35 [2023-04-02 15:12:35,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:12:35,982 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 54 transitions. [2023-04-02 15:12:35,982 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 8 states have call successors, (13), 4 states have call predecessors, (13), 5 states have return successors, (11), 6 states have call predecessors, (11), 7 states have call successors, (11) [2023-04-02 15:12:35,982 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 54 transitions. [2023-04-02 15:12:35,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-04-02 15:12:35,983 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:12:35,983 INFO L195 NwaCegarLoop]: trace histogram [5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:12:35,996 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-02 15:12:36,188 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:12:36,189 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:12:36,189 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:12:36,189 INFO L85 PathProgramCache]: Analyzing trace with hash -412799264, now seen corresponding path program 2 times [2023-04-02 15:12:36,189 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:12:36,190 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1025152435] [2023-04-02 15:12:36,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:12:36,190 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:12:36,227 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:12:36,227 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1976665313] [2023-04-02 15:12:36,227 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:12:36,227 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:12:36,228 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:12:36,229 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:12:36,252 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-02 15:12:36,297 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-02 15:12:36,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:12:36,298 INFO L262 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-02 15:12:36,299 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:12:36,348 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 11 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 15:12:36,348 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:12:36,403 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 15:12:36,404 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:12:36,404 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1025152435] [2023-04-02 15:12:36,404 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:12:36,404 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1976665313] [2023-04-02 15:12:36,404 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1976665313] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:12:36,404 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1116217975] [2023-04-02 15:12:36,409 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:12:36,409 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:12:36,409 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:12:36,410 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:12:36,410 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:12:36,431 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:12:37,061 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:12:37,068 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:12:37,070 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:12:37,074 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:12:38,732 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1299#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:12:38,732 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:12:38,732 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:12:38,732 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2023-04-02 15:12:38,733 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1841419508] [2023-04-02 15:12:38,733 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:12:38,733 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-02 15:12:38,733 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:12:38,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-02 15:12:38,734 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=896, Unknown=0, NotChecked=0, Total=1056 [2023-04-02 15:12:38,734 INFO L87 Difference]: Start difference. First operand 44 states and 54 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:12:38,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:12:38,915 INFO L93 Difference]: Finished difference Result 73 states and 91 transitions. [2023-04-02 15:12:38,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-02 15:12:38,915 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 36 [2023-04-02 15:12:38,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:12:38,916 INFO L225 Difference]: With dead ends: 73 [2023-04-02 15:12:38,916 INFO L226 Difference]: Without dead ends: 45 [2023-04-02 15:12:38,918 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 73 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 366 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=182, Invalid=1078, Unknown=0, NotChecked=0, Total=1260 [2023-04-02 15:12:38,918 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 20 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:12:38,919 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 85 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:12:38,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2023-04-02 15:12:38,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 31. [2023-04-02 15:12:38,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 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 15:12:38,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2023-04-02 15:12:38,925 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 36 [2023-04-02 15:12:38,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:12:38,925 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2023-04-02 15:12:38,926 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:12:38,926 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2023-04-02 15:12:38,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-04-02 15:12:38,926 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:12:38,927 INFO L195 NwaCegarLoop]: trace histogram [5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:12:38,934 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-02 15:12:39,131 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:12:39,132 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:12:39,132 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:12:39,132 INFO L85 PathProgramCache]: Analyzing trace with hash 1431763006, now seen corresponding path program 3 times [2023-04-02 15:12:39,132 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:12:39,132 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916735513] [2023-04-02 15:12:39,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:12:39,132 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:12:39,152 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:12:39,152 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [831875191] [2023-04-02 15:12:39,152 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:12:39,152 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:12:39,152 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:12:39,153 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:12:39,165 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-02 15:12:39,227 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:12:39,227 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:12:39,228 INFO L262 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-02 15:12:39,230 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:12:39,272 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 15:12:39,272 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:12:39,316 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 15:12:39,316 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:12:39,317 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916735513] [2023-04-02 15:12:39,317 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:12:39,317 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [831875191] [2023-04-02 15:12:39,317 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [831875191] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:12:39,317 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [637201472] [2023-04-02 15:12:39,319 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:12:39,319 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:12:39,319 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:12:39,319 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:12:39,319 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:12:39,337 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:12:39,917 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:12:39,922 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:12:39,924 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:12:39,929 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:12:41,622 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1717#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:12:41,622 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:12:41,622 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:12:41,622 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2023-04-02 15:12:41,623 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433045428] [2023-04-02 15:12:41,623 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:12:41,623 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-02 15:12:41,623 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:12:41,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-02 15:12:41,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=885, Unknown=0, NotChecked=0, Total=1056 [2023-04-02 15:12:41,624 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:12:41,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:12:41,728 INFO L93 Difference]: Finished difference Result 45 states and 54 transitions. [2023-04-02 15:12:41,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-02 15:12:41,729 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 36 [2023-04-02 15:12:41,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:12:41,729 INFO L225 Difference]: With dead ends: 45 [2023-04-02 15:12:41,729 INFO L226 Difference]: Without dead ends: 40 [2023-04-02 15:12:41,730 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 73 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 362 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=192, Invalid=1068, Unknown=0, NotChecked=0, Total=1260 [2023-04-02 15:12:41,731 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 28 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:12:41,731 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 79 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:12:41,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2023-04-02 15:12:41,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 32. [2023-04-02 15:12:41,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 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 15:12:41,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2023-04-02 15:12:41,738 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 36 [2023-04-02 15:12:41,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:12:41,738 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2023-04-02 15:12:41,738 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:12:41,738 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2023-04-02 15:12:41,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-04-02 15:12:41,739 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:12:41,739 INFO L195 NwaCegarLoop]: trace histogram [5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:12:41,748 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-02 15:12:41,944 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:12:41,945 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:12:41,945 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:12:41,945 INFO L85 PathProgramCache]: Analyzing trace with hash 1359874255, now seen corresponding path program 4 times [2023-04-02 15:12:41,945 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:12:41,945 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1747357490] [2023-04-02 15:12:41,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:12:41,945 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:12:41,966 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:12:41,966 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [129289388] [2023-04-02 15:12:41,966 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:12:41,966 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:12:41,966 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:12:41,977 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:12:41,983 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-02 15:12:42,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:12:42,057 INFO L262 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 81 conjunts are in the unsatisfiable core [2023-04-02 15:12:42,063 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:12:42,085 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-04-02 15:12:42,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:12:42,113 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2023-04-02 15:12:42,117 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2023-04-02 15:12:42,120 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-02 15:12:42,131 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-02 15:12:42,165 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2023-04-02 15:12:42,869 INFO L321 Elim1Store]: treesize reduction 52, result has 46.4 percent of original size [2023-04-02 15:12:42,870 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 62 treesize of output 77 [2023-04-02 15:12:43,133 INFO L321 Elim1Store]: treesize reduction 13, result has 23.5 percent of original size [2023-04-02 15:12:43,135 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 90 treesize of output 46 [2023-04-02 15:12:43,185 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 15:12:43,185 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:12:43,508 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:12:43,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1747357490] [2023-04-02 15:12:43,508 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:12:43,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [129289388] [2023-04-02 15:12:43,508 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [129289388] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:12:43,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [841771108] [2023-04-02 15:12:43,510 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:12:43,510 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:12:43,510 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:12:43,511 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:12:43,511 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:12:43,536 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:12:44,047 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:12:44,051 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:12:44,053 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:12:44,056 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:12:46,148 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2062#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:12:46,148 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:12:46,148 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-04-02 15:12:46,148 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2023-04-02 15:12:46,148 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1677176754] [2023-04-02 15:12:46,149 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-04-02 15:12:46,149 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-04-02 15:12:46,149 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:12:46,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-04-02 15:12:46,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=2199, Unknown=0, NotChecked=0, Total=2450 [2023-04-02 15:12:46,150 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand has 19 states, 16 states have (on average 1.3125) internal successors, (21), 15 states have internal predecessors, (21), 5 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2023-04-02 15:12:46,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:12:46,794 INFO L93 Difference]: Finished difference Result 71 states and 88 transitions. [2023-04-02 15:12:46,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-04-02 15:12:46,794 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 16 states have (on average 1.3125) internal successors, (21), 15 states have internal predecessors, (21), 5 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 37 [2023-04-02 15:12:46,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:12:46,795 INFO L225 Difference]: With dead ends: 71 [2023-04-02 15:12:46,795 INFO L226 Difference]: Without dead ends: 66 [2023-04-02 15:12:46,796 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 40 SyntacticMatches, 4 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1110 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=356, Invalid=3304, Unknown=0, NotChecked=0, Total=3660 [2023-04-02 15:12:46,797 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 68 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 336 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 399 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 336 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 15:12:46,797 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 139 Invalid, 399 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 336 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 15:12:46,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2023-04-02 15:12:46,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2023-04-02 15:12:46,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 29 states have internal predecessors, (34), 12 states have call successors, (12), 6 states have call predecessors, (12), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-02 15:12:46,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 56 transitions. [2023-04-02 15:12:46,811 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 56 transitions. Word has length 37 [2023-04-02 15:12:46,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:12:46,811 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 56 transitions. [2023-04-02 15:12:46,811 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 16 states have (on average 1.3125) internal successors, (21), 15 states have internal predecessors, (21), 5 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2023-04-02 15:12:46,811 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 56 transitions. [2023-04-02 15:12:46,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-04-02 15:12:46,818 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:12:46,818 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:12:46,832 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 15:12:47,024 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:12:47,025 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:12:47,025 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:12:47,026 INFO L85 PathProgramCache]: Analyzing trace with hash -868677026, now seen corresponding path program 5 times [2023-04-02 15:12:47,026 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:12:47,026 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1042813813] [2023-04-02 15:12:47,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:12:47,026 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:12:47,043 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:12:47,043 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [96488755] [2023-04-02 15:12:47,043 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:12:47,043 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:12:47,044 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:12:47,054 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:12:47,074 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-02 15:12:47,126 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-02 15:12:47,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:12:47,127 INFO L262 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-02 15:12:47,128 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:12:47,186 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 14 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 15:12:47,186 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:12:47,247 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 15:12:47,247 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:12:47,247 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1042813813] [2023-04-02 15:12:47,247 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:12:47,248 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96488755] [2023-04-02 15:12:47,248 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [96488755] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:12:47,248 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1871243027] [2023-04-02 15:12:47,249 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:12:47,249 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:12:47,250 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:12:47,250 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:12:47,250 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:12:47,266 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:12:47,739 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:12:47,743 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:12:47,745 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:12:47,748 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:12:49,347 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2533#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:12:49,347 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:12:49,347 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:12:49,347 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2023-04-02 15:12:49,348 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890688159] [2023-04-02 15:12:49,348 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:12:49,348 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-04-02 15:12:49,348 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:12:49,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-04-02 15:12:49,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=1073, Unknown=0, NotChecked=0, Total=1260 [2023-04-02 15:12:49,349 INFO L87 Difference]: Start difference. First operand 46 states and 56 transitions. Second operand has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 12 states have internal predecessors, (25), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:12:49,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:12:49,653 INFO L93 Difference]: Finished difference Result 112 states and 145 transitions. [2023-04-02 15:12:49,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-02 15:12:49,653 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 12 states have internal predecessors, (25), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 38 [2023-04-02 15:12:49,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:12:49,654 INFO L225 Difference]: With dead ends: 112 [2023-04-02 15:12:49,654 INFO L226 Difference]: Without dead ends: 102 [2023-04-02 15:12:49,655 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 75 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 490 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=222, Invalid=1338, Unknown=0, NotChecked=0, Total=1560 [2023-04-02 15:12:49,656 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 41 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 15:12:49,656 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [57 Valid, 164 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 161 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 15:12:49,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2023-04-02 15:12:49,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 59. [2023-04-02 15:12:49,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 37 states have (on average 1.135135135135135) internal successors, (42), 37 states have internal predecessors, (42), 16 states have call successors, (16), 7 states have call predecessors, (16), 5 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-04-02 15:12:49,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 72 transitions. [2023-04-02 15:12:49,674 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 72 transitions. Word has length 38 [2023-04-02 15:12:49,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:12:49,674 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 72 transitions. [2023-04-02 15:12:49,674 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 12 states have internal predecessors, (25), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:12:49,674 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 72 transitions. [2023-04-02 15:12:49,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-04-02 15:12:49,675 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:12:49,675 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:12:49,681 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-04-02 15:12:49,877 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:12:49,877 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:12:49,878 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:12:49,878 INFO L85 PathProgramCache]: Analyzing trace with hash 478178496, now seen corresponding path program 6 times [2023-04-02 15:12:49,878 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:12:49,878 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1300693455] [2023-04-02 15:12:49,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:12:49,878 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:12:49,909 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:12:49,910 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1764335681] [2023-04-02 15:12:49,910 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:12:49,910 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:12:49,910 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:12:49,912 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:12:49,923 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-02 15:12:49,992 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:12:49,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:12:49,993 INFO L262 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-02 15:12:49,994 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:12:50,053 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 11 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 15:12:50,054 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:12:50,111 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 15:12:50,111 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:12:50,111 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1300693455] [2023-04-02 15:12:50,111 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:12:50,111 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1764335681] [2023-04-02 15:12:50,111 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1764335681] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:12:50,111 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [212348236] [2023-04-02 15:12:50,113 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:12:50,113 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:12:50,113 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:12:50,113 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:12:50,113 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:12:50,130 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:12:50,576 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:12:50,581 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:12:50,582 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:12:50,585 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:12:52,302 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3075#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:12:52,302 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:12:52,302 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:12:52,302 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2023-04-02 15:12:52,302 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [534783862] [2023-04-02 15:12:52,303 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:12:52,303 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-04-02 15:12:52,303 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:12:52,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-04-02 15:12:52,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=1071, Unknown=0, NotChecked=0, Total=1260 [2023-04-02 15:12:52,304 INFO L87 Difference]: Start difference. First operand 59 states and 72 transitions. Second operand has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 12 states have internal predecessors, (25), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:12:52,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:12:52,733 INFO L93 Difference]: Finished difference Result 98 states and 124 transitions. [2023-04-02 15:12:52,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-04-02 15:12:52,733 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 12 states have internal predecessors, (25), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 38 [2023-04-02 15:12:52,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:12:52,735 INFO L225 Difference]: With dead ends: 98 [2023-04-02 15:12:52,735 INFO L226 Difference]: Without dead ends: 93 [2023-04-02 15:12:52,735 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 75 SyntacticMatches, 4 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 541 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=231, Invalid=1409, Unknown=0, NotChecked=0, Total=1640 [2023-04-02 15:12:52,736 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 51 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-02 15:12:52,736 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 171 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-02 15:12:52,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2023-04-02 15:12:52,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 60. [2023-04-02 15:12:52,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 38 states have (on average 1.131578947368421) internal successors, (43), 38 states have internal predecessors, (43), 16 states have call successors, (16), 7 states have call predecessors, (16), 5 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-04-02 15:12:52,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 73 transitions. [2023-04-02 15:12:52,751 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 73 transitions. Word has length 38 [2023-04-02 15:12:52,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:12:52,751 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 73 transitions. [2023-04-02 15:12:52,751 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 12 states have internal predecessors, (25), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:12:52,751 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 73 transitions. [2023-04-02 15:12:52,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-04-02 15:12:52,752 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:12:52,752 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:12:52,757 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-04-02 15:12:52,954 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-04-02 15:12:52,955 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:12:52,955 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:12:52,955 INFO L85 PathProgramCache]: Analyzing trace with hash 1863525517, now seen corresponding path program 7 times [2023-04-02 15:12:52,955 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:12:52,955 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1849008126] [2023-04-02 15:12:52,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:12:52,955 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:12:52,972 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:12:52,973 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [250550997] [2023-04-02 15:12:52,973 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:12:52,973 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:12:52,973 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:12:52,987 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:12:52,990 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-04-02 15:12:53,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:12:53,082 INFO L262 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 107 conjunts are in the unsatisfiable core [2023-04-02 15:12:53,086 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:12:53,100 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-04-02 15:12:53,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:12:53,126 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2023-04-02 15:12:53,129 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2023-04-02 15:12:53,132 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-02 15:12:53,136 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-02 15:12:53,176 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2023-04-02 15:12:53,245 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 55 [2023-04-02 15:12:54,226 INFO L321 Elim1Store]: treesize reduction 78, result has 46.2 percent of original size [2023-04-02 15:12:54,226 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 5 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 76 treesize of output 105 [2023-04-02 15:12:54,770 INFO L321 Elim1Store]: treesize reduction 21, result has 16.0 percent of original size [2023-04-02 15:12:54,770 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 3 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 164 treesize of output 80 [2023-04-02 15:12:54,847 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 20 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 15:12:54,847 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:12:56,285 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:12:56,286 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1849008126] [2023-04-02 15:12:56,286 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:12:56,286 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [250550997] [2023-04-02 15:12:56,286 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [250550997] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:12:56,286 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [740116992] [2023-04-02 15:12:56,287 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:12:56,287 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:12:56,288 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:12:56,288 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:12:56,288 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:12:56,303 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:12:56,783 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:12:56,787 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:12:56,789 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:12:56,792 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:12:59,441 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3571#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:12:59,441 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:12:59,441 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-04-02 15:12:59,441 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2023-04-02 15:12:59,441 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951501269] [2023-04-02 15:12:59,441 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-04-02 15:12:59,442 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-04-02 15:12:59,442 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:12:59,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-04-02 15:12:59,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=328, Invalid=3332, Unknown=0, NotChecked=0, Total=3660 [2023-04-02 15:12:59,443 INFO L87 Difference]: Start difference. First operand 60 states and 73 transitions. Second operand has 24 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 6 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2023-04-02 15:13:00,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:13:00,791 INFO L93 Difference]: Finished difference Result 101 states and 126 transitions. [2023-04-02 15:13:00,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-04-02 15:13:00,792 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 6 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 39 [2023-04-02 15:13:00,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:13:00,793 INFO L225 Difference]: With dead ends: 101 [2023-04-02 15:13:00,793 INFO L226 Difference]: Without dead ends: 96 [2023-04-02 15:13:00,794 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 34 SyntacticMatches, 4 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1779 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=499, Invalid=5051, Unknown=0, NotChecked=0, Total=5550 [2023-04-02 15:13:00,794 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 70 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 638 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 702 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 638 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-02 15:13:00,794 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 201 Invalid, 702 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 638 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-04-02 15:13:00,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2023-04-02 15:13:00,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 74. [2023-04-02 15:13:00,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 47 states have (on average 1.148936170212766) internal successors, (54), 47 states have internal predecessors, (54), 20 states have call successors, (20), 8 states have call predecessors, (20), 6 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2023-04-02 15:13:00,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 92 transitions. [2023-04-02 15:13:00,818 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 92 transitions. Word has length 39 [2023-04-02 15:13:00,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:13:00,818 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 92 transitions. [2023-04-02 15:13:00,819 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 6 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2023-04-02 15:13:00,819 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 92 transitions. [2023-04-02 15:13:00,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-04-02 15:13:00,820 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:13:00,820 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:13:00,825 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-04-02 15:13:01,022 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-04-02 15:13:01,022 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:13:01,023 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:13:01,023 INFO L85 PathProgramCache]: Analyzing trace with hash 1859610208, now seen corresponding path program 8 times [2023-04-02 15:13:01,023 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:13:01,023 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1703475386] [2023-04-02 15:13:01,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:13:01,023 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:13:01,036 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:13:01,036 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1165383043] [2023-04-02 15:13:01,036 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:13:01,036 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:13:01,036 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:13:01,037 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:13:01,050 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-04-02 15:13:01,151 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-04-02 15:13:01,151 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:13:01,152 INFO L262 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-02 15:13:01,153 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:13:01,224 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 18 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 15:13:01,224 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:13:01,290 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 15:13:01,290 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:13:01,290 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1703475386] [2023-04-02 15:13:01,290 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:13:01,290 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1165383043] [2023-04-02 15:13:01,290 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1165383043] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:13:01,290 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [126028646] [2023-04-02 15:13:01,291 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:13:01,291 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:13:01,292 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:13:01,292 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:13:01,292 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:13:01,306 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:13:01,752 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:13:01,755 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:13:01,758 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:13:01,761 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:13:03,427 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4157#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:13:03,427 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:13:03,427 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:13:03,427 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2023-04-02 15:13:03,428 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721133657] [2023-04-02 15:13:03,428 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:13:03,428 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-04-02 15:13:03,428 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:13:03,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-04-02 15:13:03,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=1264, Unknown=0, NotChecked=0, Total=1482 [2023-04-02 15:13:03,429 INFO L87 Difference]: Start difference. First operand 74 states and 92 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:13:03,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:13:03,991 INFO L93 Difference]: Finished difference Result 191 states and 256 transitions. [2023-04-02 15:13:03,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-04-02 15:13:03,992 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 40 [2023-04-02 15:13:03,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:13:03,993 INFO L225 Difference]: With dead ends: 191 [2023-04-02 15:13:03,993 INFO L226 Difference]: Without dead ends: 180 [2023-04-02 15:13:03,994 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 77 SyntacticMatches, 5 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 674 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=295, Invalid=1775, Unknown=0, NotChecked=0, Total=2070 [2023-04-02 15:13:03,994 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 134 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 167 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 154 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 383 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 167 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-02 15:13:03,995 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [154 Valid, 169 Invalid, 383 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [167 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-02 15:13:03,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2023-04-02 15:13:04,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 85. [2023-04-02 15:13:04,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 53 states have internal predecessors, (60), 24 states have call successors, (24), 9 states have call predecessors, (24), 7 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2023-04-02 15:13:04,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 106 transitions. [2023-04-02 15:13:04,028 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 106 transitions. Word has length 40 [2023-04-02 15:13:04,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:13:04,028 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 106 transitions. [2023-04-02 15:13:04,028 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:13:04,028 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 106 transitions. [2023-04-02 15:13:04,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-04-02 15:13:04,029 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:13:04,029 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:13:04,038 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-04-02 15:13:04,235 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-04-02 15:13:04,235 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:13:04,235 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:13:04,236 INFO L85 PathProgramCache]: Analyzing trace with hash 662458430, now seen corresponding path program 9 times [2023-04-02 15:13:04,236 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:13:04,236 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [186610222] [2023-04-02 15:13:04,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:13:04,236 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:13:04,249 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:13:04,249 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1465568662] [2023-04-02 15:13:04,249 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:13:04,249 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:13:04,249 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:13:04,250 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:13:04,263 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-04-02 15:13:04,362 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:13:04,363 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:13:04,364 INFO L262 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-02 15:13:04,364 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:13:04,432 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 14 proven. 10 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 15:13:04,433 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:13:04,496 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 15:13:04,497 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:13:04,497 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [186610222] [2023-04-02 15:13:04,497 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:13:04,497 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1465568662] [2023-04-02 15:13:04,497 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1465568662] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:13:04,497 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1917800753] [2023-04-02 15:13:04,499 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:13:04,499 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:13:04,499 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:13:04,499 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:13:04,499 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:13:04,521 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:13:04,931 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:13:04,936 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:13:04,937 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:13:04,940 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:13:06,609 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4885#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:13:06,609 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:13:06,609 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:13:06,609 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2023-04-02 15:13:06,610 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491249504] [2023-04-02 15:13:06,610 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:13:06,610 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-04-02 15:13:06,610 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:13:06,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-04-02 15:13:06,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=1273, Unknown=0, NotChecked=0, Total=1482 [2023-04-02 15:13:06,611 INFO L87 Difference]: Start difference. First operand 85 states and 106 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:13:06,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:13:06,951 INFO L93 Difference]: Finished difference Result 138 states and 177 transitions. [2023-04-02 15:13:06,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-02 15:13:06,952 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 40 [2023-04-02 15:13:06,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:13:06,953 INFO L225 Difference]: With dead ends: 138 [2023-04-02 15:13:06,953 INFO L226 Difference]: Without dead ends: 133 [2023-04-02 15:13:06,954 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 77 SyntacticMatches, 5 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 719 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=268, Invalid=1712, Unknown=0, NotChecked=0, Total=1980 [2023-04-02 15:13:06,954 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 72 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 216 SdHoareTripleChecker+Invalid, 281 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 15:13:06,954 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 216 Invalid, 281 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 202 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 15:13:06,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2023-04-02 15:13:06,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 86. [2023-04-02 15:13:06,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 54 states have (on average 1.1296296296296295) internal successors, (61), 54 states have internal predecessors, (61), 24 states have call successors, (24), 9 states have call predecessors, (24), 7 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2023-04-02 15:13:06,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 107 transitions. [2023-04-02 15:13:06,990 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 107 transitions. Word has length 40 [2023-04-02 15:13:06,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:13:06,990 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 107 transitions. [2023-04-02 15:13:06,990 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:13:06,990 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 107 transitions. [2023-04-02 15:13:06,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-04-02 15:13:06,991 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:13:06,991 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:13:07,000 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-04-02 15:13:07,197 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-04-02 15:13:07,198 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:13:07,198 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:13:07,198 INFO L85 PathProgramCache]: Analyzing trace with hash -1013731121, now seen corresponding path program 10 times [2023-04-02 15:13:07,198 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:13:07,198 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409221953] [2023-04-02 15:13:07,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:13:07,198 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:13:07,218 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:13:07,218 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [803651285] [2023-04-02 15:13:07,218 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:13:07,218 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:13:07,218 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:13:07,219 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:13:07,233 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-04-02 15:13:07,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:13:07,422 WARN L260 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 127 conjunts are in the unsatisfiable core [2023-04-02 15:13:07,426 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:13:07,443 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-04-02 15:13:07,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:13:07,468 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2023-04-02 15:13:07,471 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2023-04-02 15:13:07,474 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-02 15:13:07,478 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-02 15:13:07,512 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2023-04-02 15:13:07,563 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 55 [2023-04-02 15:13:07,626 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 75 [2023-04-02 15:13:08,702 INFO L321 Elim1Store]: treesize reduction 104, result has 46.1 percent of original size [2023-04-02 15:13:08,703 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 8 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 8 case distinctions, treesize of input 90 treesize of output 133 [2023-04-02 15:13:09,638 INFO L321 Elim1Store]: treesize reduction 29, result has 12.1 percent of original size [2023-04-02 15:13:09,638 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 6 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 252 treesize of output 120 [2023-04-02 15:13:09,710 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 8 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 15:13:09,710 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:13:11,152 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:13:11,152 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409221953] [2023-04-02 15:13:11,152 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:13:11,152 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [803651285] [2023-04-02 15:13:11,152 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [803651285] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:13:11,152 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1409786864] [2023-04-02 15:13:11,153 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:13:11,153 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:13:11,154 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:13:11,154 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:13:11,154 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:13:11,166 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:13:11,615 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:13:11,620 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:13:11,621 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:13:11,624 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:13:14,718 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5500#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:13:14,718 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:13:14,718 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-04-02 15:13:14,718 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2023-04-02 15:13:14,718 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [6304853] [2023-04-02 15:13:14,718 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-04-02 15:13:14,719 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-04-02 15:13:14,719 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:13:14,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-04-02 15:13:14,720 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=342, Invalid=3690, Unknown=0, NotChecked=0, Total=4032 [2023-04-02 15:13:14,720 INFO L87 Difference]: Start difference. First operand 86 states and 107 transitions. Second operand has 26 states, 20 states have (on average 1.25) internal successors, (25), 20 states have internal predecessors, (25), 6 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2023-04-02 15:13:16,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:13:16,438 INFO L93 Difference]: Finished difference Result 129 states and 162 transitions. [2023-04-02 15:13:16,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-04-02 15:13:16,441 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 20 states have (on average 1.25) internal successors, (25), 20 states have internal predecessors, (25), 6 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 41 [2023-04-02 15:13:16,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:13:16,443 INFO L225 Difference]: With dead ends: 129 [2023-04-02 15:13:16,443 INFO L226 Difference]: Without dead ends: 124 [2023-04-02 15:13:16,444 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 36 SyntacticMatches, 4 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1927 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=522, Invalid=5640, Unknown=0, NotChecked=0, Total=6162 [2023-04-02 15:13:16,445 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 82 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 600 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 676 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 600 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-04-02 15:13:16,445 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 181 Invalid, 676 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 600 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-04-02 15:13:16,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2023-04-02 15:13:16,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 100. [2023-04-02 15:13:16,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 63 states have (on average 1.1428571428571428) internal successors, (72), 63 states have internal predecessors, (72), 28 states have call successors, (28), 10 states have call predecessors, (28), 8 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2023-04-02 15:13:16,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 126 transitions. [2023-04-02 15:13:16,483 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 126 transitions. Word has length 41 [2023-04-02 15:13:16,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:13:16,483 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 126 transitions. [2023-04-02 15:13:16,483 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 20 states have (on average 1.25) internal successors, (25), 20 states have internal predecessors, (25), 6 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2023-04-02 15:13:16,484 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 126 transitions. [2023-04-02 15:13:16,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-04-02 15:13:16,484 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:13:16,484 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:13:16,490 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-04-02 15:13:16,685 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-04-02 15:13:16,685 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:13:16,685 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:13:16,685 INFO L85 PathProgramCache]: Analyzing trace with hash -1435999650, now seen corresponding path program 11 times [2023-04-02 15:13:16,686 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:13:16,686 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [262386352] [2023-04-02 15:13:16,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:13:16,686 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:13:16,699 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:13:16,699 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1654527281] [2023-04-02 15:13:16,699 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:13:16,699 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:13:16,700 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:13:16,701 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:13:16,715 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-04-02 15:13:16,831 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-04-02 15:13:16,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:13:16,832 INFO L262 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-02 15:13:16,834 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:13:16,918 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 23 proven. 10 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 15:13:16,918 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:13:16,996 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 15:13:16,996 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:13:16,997 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [262386352] [2023-04-02 15:13:16,997 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:13:16,997 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1654527281] [2023-04-02 15:13:16,997 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1654527281] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:13:16,997 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1811321061] [2023-04-02 15:13:16,998 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:13:16,998 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:13:16,999 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:13:16,999 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:13:16,999 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:13:17,015 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:13:17,400 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:13:17,405 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:13:17,406 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:13:17,408 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:13:19,133 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6189#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:13:19,133 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:13:19,133 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:13:19,133 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 18 [2023-04-02 15:13:19,133 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1141173127] [2023-04-02 15:13:19,133 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:13:19,133 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-04-02 15:13:19,133 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:13:19,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-04-02 15:13:19,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=1469, Unknown=0, NotChecked=0, Total=1722 [2023-04-02 15:13:19,134 INFO L87 Difference]: Start difference. First operand 100 states and 126 transitions. Second operand has 18 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 18 states have internal predecessors, (31), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:13:19,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:13:19,919 INFO L93 Difference]: Finished difference Result 298 states and 405 transitions. [2023-04-02 15:13:19,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-04-02 15:13:19,919 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 18 states have internal predecessors, (31), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 42 [2023-04-02 15:13:19,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:13:19,921 INFO L225 Difference]: With dead ends: 298 [2023-04-02 15:13:19,921 INFO L226 Difference]: Without dead ends: 286 [2023-04-02 15:13:19,922 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 79 SyntacticMatches, 6 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 937 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=410, Invalid=2452, Unknown=0, NotChecked=0, Total=2862 [2023-04-02 15:13:19,923 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 227 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 281 mSolverCounterSat, 271 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 251 SdHoareTripleChecker+Valid, 254 SdHoareTripleChecker+Invalid, 552 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 271 IncrementalHoareTripleChecker+Valid, 281 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-02 15:13:19,923 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [251 Valid, 254 Invalid, 552 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [271 Valid, 281 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-04-02 15:13:19,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2023-04-02 15:13:19,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 111. [2023-04-02 15:13:19,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 69 states have (on average 1.1304347826086956) internal successors, (78), 69 states have internal predecessors, (78), 32 states have call successors, (32), 11 states have call predecessors, (32), 9 states have return successors, (30), 30 states have call predecessors, (30), 30 states have call successors, (30) [2023-04-02 15:13:19,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 140 transitions. [2023-04-02 15:13:19,975 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 140 transitions. Word has length 42 [2023-04-02 15:13:19,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:13:19,975 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 140 transitions. [2023-04-02 15:13:19,976 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 18 states have internal predecessors, (31), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:13:19,976 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 140 transitions. [2023-04-02 15:13:19,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-04-02 15:13:19,976 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:13:19,976 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:13:19,988 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-04-02 15:13:20,183 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-04-02 15:13:20,183 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:13:20,184 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:13:20,184 INFO L85 PathProgramCache]: Analyzing trace with hash 107000896, now seen corresponding path program 12 times [2023-04-02 15:13:20,184 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:13:20,184 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1248590533] [2023-04-02 15:13:20,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:13:20,184 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:13:20,219 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:13:20,219 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2050527303] [2023-04-02 15:13:20,219 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:13:20,220 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:13:20,220 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:13:20,227 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:13:20,230 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-04-02 15:13:20,401 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:13:20,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:13:20,403 INFO L262 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-02 15:13:20,404 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:13:20,494 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 18 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 15:13:20,494 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:13:20,581 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 15:13:20,581 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:13:20,581 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1248590533] [2023-04-02 15:13:20,581 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:13:20,581 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2050527303] [2023-04-02 15:13:20,582 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2050527303] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:13:20,582 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1969752316] [2023-04-02 15:13:20,584 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:13:20,584 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:13:20,585 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:13:20,585 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:13:20,585 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:13:20,601 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:13:21,051 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:13:21,056 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:13:21,058 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:13:21,061 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:13:22,765 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7153#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:13:22,766 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:13:22,766 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:13:22,766 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 18 [2023-04-02 15:13:22,766 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846210603] [2023-04-02 15:13:22,766 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:13:22,766 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-04-02 15:13:22,766 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:13:22,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-04-02 15:13:22,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=1489, Unknown=0, NotChecked=0, Total=1722 [2023-04-02 15:13:22,767 INFO L87 Difference]: Start difference. First operand 111 states and 140 transitions. Second operand has 18 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 18 states have internal predecessors, (31), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:13:23,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:13:23,475 INFO L93 Difference]: Finished difference Result 179 states and 231 transitions. [2023-04-02 15:13:23,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-04-02 15:13:23,475 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 18 states have internal predecessors, (31), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 42 [2023-04-02 15:13:23,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:13:23,477 INFO L225 Difference]: With dead ends: 179 [2023-04-02 15:13:23,477 INFO L226 Difference]: Without dead ends: 174 [2023-04-02 15:13:23,478 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 79 SyntacticMatches, 6 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 911 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=312, Invalid=2040, Unknown=0, NotChecked=0, Total=2352 [2023-04-02 15:13:23,478 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 82 mSDsluCounter, 230 mSDsCounter, 0 mSdLazyCounter, 420 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 290 SdHoareTripleChecker+Invalid, 511 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 420 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-04-02 15:13:23,478 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 290 Invalid, 511 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 420 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-04-02 15:13:23,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2023-04-02 15:13:23,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 112. [2023-04-02 15:13:23,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 70 states have (on average 1.1285714285714286) internal successors, (79), 70 states have internal predecessors, (79), 32 states have call successors, (32), 11 states have call predecessors, (32), 9 states have return successors, (30), 30 states have call predecessors, (30), 30 states have call successors, (30) [2023-04-02 15:13:23,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 141 transitions. [2023-04-02 15:13:23,525 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 141 transitions. Word has length 42 [2023-04-02 15:13:23,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:13:23,525 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 141 transitions. [2023-04-02 15:13:23,525 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 18 states have internal predecessors, (31), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:13:23,525 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 141 transitions. [2023-04-02 15:13:23,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-04-02 15:13:23,526 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:13:23,526 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:13:23,532 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2023-04-02 15:13:23,732 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:13:23,733 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:13:23,733 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:13:23,733 INFO L85 PathProgramCache]: Analyzing trace with hash -1053045491, now seen corresponding path program 13 times [2023-04-02 15:13:23,733 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:13:23,733 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1104585499] [2023-04-02 15:13:23,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:13:23,733 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:13:23,760 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:13:23,760 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [577704962] [2023-04-02 15:13:23,761 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:13:23,761 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:13:23,761 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:13:23,762 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:13:23,764 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-04-02 15:13:23,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:13:23,958 WARN L260 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 141 conjunts are in the unsatisfiable core [2023-04-02 15:13:23,974 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:13:23,991 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-04-02 15:13:24,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:13:24,023 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2023-04-02 15:13:24,026 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2023-04-02 15:13:24,029 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-02 15:13:24,034 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-02 15:13:24,070 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2023-04-02 15:13:24,115 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 55 [2023-04-02 15:13:24,170 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 75 [2023-04-02 15:13:24,243 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 11 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 84 treesize of output 95 [2023-04-02 15:13:25,553 INFO L321 Elim1Store]: treesize reduction 130, result has 46.1 percent of original size [2023-04-02 15:13:25,553 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 12 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 10 case distinctions, treesize of input 104 treesize of output 161 [2023-04-02 15:13:27,286 INFO L321 Elim1Store]: treesize reduction 37, result has 9.8 percent of original size [2023-04-02 15:13:27,287 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 10 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 354 treesize of output 166 [2023-04-02 15:13:27,370 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 38 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 15:13:27,371 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:13:29,744 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:13:29,744 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1104585499] [2023-04-02 15:13:29,744 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:13:29,744 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [577704962] [2023-04-02 15:13:29,744 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [577704962] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:13:29,744 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [735340964] [2023-04-02 15:13:29,746 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:13:29,746 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:13:29,746 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:13:29,746 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:13:29,746 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:13:29,762 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:13:30,153 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:13:30,157 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:13:30,158 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:13:30,160 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:13:33,251 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7889#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:13:33,251 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:13:33,251 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-04-02 15:13:33,251 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2023-04-02 15:13:33,252 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [181478663] [2023-04-02 15:13:33,252 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-04-02 15:13:33,252 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-04-02 15:13:33,252 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:13:33,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-04-02 15:13:33,253 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=356, Invalid=4066, Unknown=0, NotChecked=0, Total=4422 [2023-04-02 15:13:33,253 INFO L87 Difference]: Start difference. First operand 112 states and 141 transitions. Second operand has 28 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 6 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2023-04-02 15:13:36,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:13:36,222 INFO L93 Difference]: Finished difference Result 157 states and 198 transitions. [2023-04-02 15:13:36,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2023-04-02 15:13:36,223 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 6 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 43 [2023-04-02 15:13:36,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:13:36,224 INFO L225 Difference]: With dead ends: 157 [2023-04-02 15:13:36,224 INFO L226 Difference]: Without dead ends: 152 [2023-04-02 15:13:36,225 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 38 SyntacticMatches, 4 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2081 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=545, Invalid=6261, Unknown=0, NotChecked=0, Total=6806 [2023-04-02 15:13:36,225 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 83 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 989 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 1063 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 989 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:13:36,225 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 252 Invalid, 1063 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 989 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2023-04-02 15:13:36,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2023-04-02 15:13:36,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 126. [2023-04-02 15:13:36,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 79 states have (on average 1.139240506329114) internal successors, (90), 79 states have internal predecessors, (90), 36 states have call successors, (36), 12 states have call predecessors, (36), 10 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2023-04-02 15:13:36,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 160 transitions. [2023-04-02 15:13:36,278 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 160 transitions. Word has length 43 [2023-04-02 15:13:36,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:13:36,278 INFO L495 AbstractCegarLoop]: Abstraction has 126 states and 160 transitions. [2023-04-02 15:13:36,278 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 6 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2023-04-02 15:13:36,278 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 160 transitions. [2023-04-02 15:13:36,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-04-02 15:13:36,279 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:13:36,279 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:13:36,285 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2023-04-02 15:13:36,480 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-04-02 15:13:36,481 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:13:36,481 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:13:36,481 INFO L85 PathProgramCache]: Analyzing trace with hash 1640222176, now seen corresponding path program 14 times [2023-04-02 15:13:36,481 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:13:36,481 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1142492510] [2023-04-02 15:13:36,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:13:36,481 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:13:36,495 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:13:36,495 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1820339191] [2023-04-02 15:13:36,495 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:13:36,495 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:13:36,495 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:13:36,496 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:13:36,501 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-04-02 15:13:36,653 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-04-02 15:13:36,653 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:13:36,654 INFO L262 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 14 conjunts are in the unsatisfiable core [2023-04-02 15:13:36,655 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:13:36,759 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 29 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 15:13:36,760 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:13:36,866 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 15:13:36,866 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:13:36,866 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1142492510] [2023-04-02 15:13:36,866 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:13:36,866 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1820339191] [2023-04-02 15:13:36,866 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1820339191] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:13:36,866 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [729277587] [2023-04-02 15:13:36,868 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:13:36,868 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:13:36,868 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:13:36,868 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:13:36,868 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:13:36,881 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:13:37,270 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:13:37,281 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:13:37,282 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:13:37,285 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:13:39,072 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8681#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:13:39,072 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:13:39,072 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:13:39,072 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 21 [2023-04-02 15:13:39,072 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103009758] [2023-04-02 15:13:39,072 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:13:39,073 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-04-02 15:13:39,073 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:13:39,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-04-02 15:13:39,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=292, Invalid=1688, Unknown=0, NotChecked=0, Total=1980 [2023-04-02 15:13:39,074 INFO L87 Difference]: Start difference. First operand 126 states and 160 transitions. Second operand has 21 states, 21 states have (on average 1.619047619047619) internal successors, (34), 21 states have internal predecessors, (34), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:13:40,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:13:40,092 INFO L93 Difference]: Finished difference Result 431 states and 590 transitions. [2023-04-02 15:13:40,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2023-04-02 15:13:40,093 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.619047619047619) internal successors, (34), 21 states have internal predecessors, (34), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 44 [2023-04-02 15:13:40,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:13:40,095 INFO L225 Difference]: With dead ends: 431 [2023-04-02 15:13:40,095 INFO L226 Difference]: Without dead ends: 418 [2023-04-02 15:13:40,096 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 81 SyntacticMatches, 7 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1276 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=565, Invalid=3341, Unknown=0, NotChecked=0, Total=3906 [2023-04-02 15:13:40,096 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 391 mSDsluCounter, 275 mSDsCounter, 0 mSdLazyCounter, 428 mSolverCounterSat, 445 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 419 SdHoareTripleChecker+Valid, 337 SdHoareTripleChecker+Invalid, 873 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 445 IncrementalHoareTripleChecker+Valid, 428 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-04-02 15:13:40,096 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [419 Valid, 337 Invalid, 873 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [445 Valid, 428 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-04-02 15:13:40,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2023-04-02 15:13:40,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 137. [2023-04-02 15:13:40,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 85 states have (on average 1.1294117647058823) internal successors, (96), 85 states have internal predecessors, (96), 40 states have call successors, (40), 13 states have call predecessors, (40), 11 states have return successors, (38), 38 states have call predecessors, (38), 38 states have call successors, (38) [2023-04-02 15:13:40,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 174 transitions. [2023-04-02 15:13:40,168 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 174 transitions. Word has length 44 [2023-04-02 15:13:40,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:13:40,168 INFO L495 AbstractCegarLoop]: Abstraction has 137 states and 174 transitions. [2023-04-02 15:13:40,169 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.619047619047619) internal successors, (34), 21 states have internal predecessors, (34), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:13:40,169 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 174 transitions. [2023-04-02 15:13:40,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-04-02 15:13:40,170 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:13:40,170 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:13:40,176 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2023-04-02 15:13:40,376 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-04-02 15:13:40,376 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:13:40,377 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:13:40,377 INFO L85 PathProgramCache]: Analyzing trace with hash -2066368450, now seen corresponding path program 15 times [2023-04-02 15:13:40,377 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:13:40,377 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687574062] [2023-04-02 15:13:40,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:13:40,377 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:13:40,391 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:13:40,391 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [26842023] [2023-04-02 15:13:40,391 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:13:40,391 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:13:40,391 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:13:40,392 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:13:40,405 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-04-02 15:13:40,570 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:13:40,570 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:13:40,572 INFO L262 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 14 conjunts are in the unsatisfiable core [2023-04-02 15:13:40,573 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:13:40,686 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 23 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 15:13:40,686 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:13:40,781 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 15:13:40,782 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:13:40,782 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687574062] [2023-04-02 15:13:40,782 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:13:40,782 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [26842023] [2023-04-02 15:13:40,782 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [26842023] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:13:40,782 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [771198320] [2023-04-02 15:13:40,783 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:13:40,783 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:13:40,783 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:13:40,783 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:13:40,783 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:13:40,797 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:13:41,157 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:13:41,162 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:13:41,163 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:13:41,166 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:13:42,888 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9925#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:13:42,888 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:13:42,888 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:13:42,888 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 21 [2023-04-02 15:13:42,888 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552314161] [2023-04-02 15:13:42,888 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:13:42,889 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-04-02 15:13:42,889 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:13:42,889 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-04-02 15:13:42,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=1719, Unknown=0, NotChecked=0, Total=1980 [2023-04-02 15:13:42,889 INFO L87 Difference]: Start difference. First operand 137 states and 174 transitions. Second operand has 21 states, 21 states have (on average 1.619047619047619) internal successors, (34), 21 states have internal predecessors, (34), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:13:43,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:13:43,501 INFO L93 Difference]: Finished difference Result 221 states and 286 transitions. [2023-04-02 15:13:43,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-04-02 15:13:43,501 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.619047619047619) internal successors, (34), 21 states have internal predecessors, (34), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 44 [2023-04-02 15:13:43,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:13:43,502 INFO L225 Difference]: With dead ends: 221 [2023-04-02 15:13:43,502 INFO L226 Difference]: Without dead ends: 216 [2023-04-02 15:13:43,502 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 81 SyntacticMatches, 7 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1115 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=363, Invalid=2393, Unknown=0, NotChecked=0, Total=2756 [2023-04-02 15:13:43,503 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 148 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 363 mSolverCounterSat, 159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 338 SdHoareTripleChecker+Invalid, 522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 363 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-02 15:13:43,503 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [152 Valid, 338 Invalid, 522 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 363 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-02 15:13:43,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2023-04-02 15:13:43,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 138. [2023-04-02 15:13:43,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 86 states have (on average 1.127906976744186) internal successors, (97), 86 states have internal predecessors, (97), 40 states have call successors, (40), 13 states have call predecessors, (40), 11 states have return successors, (38), 38 states have call predecessors, (38), 38 states have call successors, (38) [2023-04-02 15:13:43,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 175 transitions. [2023-04-02 15:13:43,563 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 175 transitions. Word has length 44 [2023-04-02 15:13:43,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:13:43,563 INFO L495 AbstractCegarLoop]: Abstraction has 138 states and 175 transitions. [2023-04-02 15:13:43,564 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.619047619047619) internal successors, (34), 21 states have internal predecessors, (34), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:13:43,564 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 175 transitions. [2023-04-02 15:13:43,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-04-02 15:13:43,564 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:13:43,565 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:13:43,573 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2023-04-02 15:13:43,771 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-04-02 15:13:43,772 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:13:43,772 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:13:43,772 INFO L85 PathProgramCache]: Analyzing trace with hash 291981519, now seen corresponding path program 16 times [2023-04-02 15:13:43,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:13:43,773 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1852145998] [2023-04-02 15:13:43,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:13:43,773 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:13:43,792 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:13:43,792 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [368006205] [2023-04-02 15:13:43,792 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:13:43,792 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:13:43,792 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:13:43,793 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:13:43,815 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-04-02 15:13:44,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:13:44,089 WARN L260 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 157 conjunts are in the unsatisfiable core [2023-04-02 15:13:44,093 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:13:44,108 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-04-02 15:13:44,133 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:13:44,135 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2023-04-02 15:13:44,138 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2023-04-02 15:13:44,140 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-02 15:13:44,146 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-02 15:13:44,179 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2023-04-02 15:13:44,225 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 55 [2023-04-02 15:13:44,283 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 75 [2023-04-02 15:13:44,347 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 11 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 84 treesize of output 95 [2023-04-02 15:13:44,429 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 16 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 98 treesize of output 115 [2023-04-02 15:13:45,987 INFO L321 Elim1Store]: treesize reduction 156, result has 46.0 percent of original size [2023-04-02 15:13:45,988 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 12 select indices, 12 select index equivalence classes, 17 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 12 case distinctions, treesize of input 118 treesize of output 189 [2023-04-02 15:13:48,905 INFO L321 Elim1Store]: treesize reduction 45, result has 8.2 percent of original size [2023-04-02 15:13:48,906 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 15 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 470 treesize of output 218 [2023-04-02 15:13:49,021 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 8 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 15:13:49,021 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:13:51,606 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:13:51,607 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1852145998] [2023-04-02 15:13:51,607 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:13:51,607 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [368006205] [2023-04-02 15:13:51,607 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [368006205] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:13:51,607 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1069116707] [2023-04-02 15:13:51,608 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:13:51,608 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:13:51,608 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:13:51,608 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:13:51,608 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:13:51,621 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:13:51,990 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:13:51,994 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:13:51,995 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:13:51,997 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:13:55,509 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10784#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:13:55,509 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:13:55,509 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-04-02 15:13:55,509 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2023-04-02 15:13:55,509 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507860409] [2023-04-02 15:13:55,509 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-04-02 15:13:55,510 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2023-04-02 15:13:55,510 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:13:55,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2023-04-02 15:13:55,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=4460, Unknown=0, NotChecked=0, Total=4830 [2023-04-02 15:13:55,511 INFO L87 Difference]: Start difference. First operand 138 states and 175 transitions. Second operand has 30 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 24 states have internal predecessors, (29), 6 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2023-04-02 15:13:59,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:13:59,179 INFO L93 Difference]: Finished difference Result 185 states and 234 transitions. [2023-04-02 15:13:59,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2023-04-02 15:13:59,180 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 24 states have internal predecessors, (29), 6 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 45 [2023-04-02 15:13:59,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:13:59,181 INFO L225 Difference]: With dead ends: 185 [2023-04-02 15:13:59,181 INFO L226 Difference]: Without dead ends: 180 [2023-04-02 15:13:59,182 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 40 SyntacticMatches, 4 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2241 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=568, Invalid=6914, Unknown=0, NotChecked=0, Total=7482 [2023-04-02 15:13:59,182 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 84 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 1144 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 273 SdHoareTripleChecker+Invalid, 1221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 1144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2023-04-02 15:13:59,183 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 273 Invalid, 1221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 1144 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2023-04-02 15:13:59,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2023-04-02 15:13:59,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 152. [2023-04-02 15:13:59,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 95 states have (on average 1.1368421052631579) internal successors, (108), 95 states have internal predecessors, (108), 44 states have call successors, (44), 14 states have call predecessors, (44), 12 states have return successors, (42), 42 states have call predecessors, (42), 42 states have call successors, (42) [2023-04-02 15:13:59,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 194 transitions. [2023-04-02 15:13:59,260 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 194 transitions. Word has length 45 [2023-04-02 15:13:59,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:13:59,260 INFO L495 AbstractCegarLoop]: Abstraction has 152 states and 194 transitions. [2023-04-02 15:13:59,261 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 24 states have internal predecessors, (29), 6 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2023-04-02 15:13:59,261 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 194 transitions. [2023-04-02 15:13:59,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-04-02 15:13:59,261 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:13:59,262 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:13:59,268 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2023-04-02 15:13:59,468 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:13:59,469 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:13:59,469 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:13:59,469 INFO L85 PathProgramCache]: Analyzing trace with hash 386386526, now seen corresponding path program 17 times [2023-04-02 15:13:59,469 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:13:59,469 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429002777] [2023-04-02 15:13:59,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:13:59,469 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:13:59,484 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:13:59,484 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [567233787] [2023-04-02 15:13:59,484 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:13:59,484 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:13:59,484 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:13:59,485 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:13:59,509 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-04-02 15:13:59,750 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-04-02 15:13:59,750 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:13:59,752 INFO L262 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 16 conjunts are in the unsatisfiable core [2023-04-02 15:13:59,753 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:13:59,873 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 36 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 15:13:59,873 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:13:59,993 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 15:13:59,993 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:13:59,993 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429002777] [2023-04-02 15:13:59,993 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:13:59,993 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [567233787] [2023-04-02 15:13:59,993 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [567233787] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:13:59,993 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1435590793] [2023-04-02 15:13:59,995 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:13:59,995 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:13:59,996 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:13:59,996 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:13:59,996 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:14:00,009 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:14:00,370 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:14:00,374 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:14:00,375 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:14:00,377 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:14:02,253 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11679#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:14:02,253 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:14:02,253 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:14:02,253 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 24 [2023-04-02 15:14:02,254 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30992803] [2023-04-02 15:14:02,254 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:14:02,254 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-04-02 15:14:02,254 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:14:02,254 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-04-02 15:14:02,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=335, Invalid=1921, Unknown=0, NotChecked=0, Total=2256 [2023-04-02 15:14:02,255 INFO L87 Difference]: Start difference. First operand 152 states and 194 transitions. Second operand has 24 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 24 states have internal predecessors, (37), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:14:03,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:14:03,708 INFO L93 Difference]: Finished difference Result 591 states and 812 transitions. [2023-04-02 15:14:03,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2023-04-02 15:14:03,709 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 24 states have internal predecessors, (37), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 46 [2023-04-02 15:14:03,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:14:03,712 INFO L225 Difference]: With dead ends: 591 [2023-04-02 15:14:03,712 INFO L226 Difference]: Without dead ends: 577 [2023-04-02 15:14:03,713 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 83 SyntacticMatches, 8 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1711 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=766, Invalid=4490, Unknown=0, NotChecked=0, Total=5256 [2023-04-02 15:14:03,713 INFO L413 NwaCegarLoop]: 73 mSDtfsCounter, 531 mSDsluCounter, 347 mSDsCounter, 0 mSdLazyCounter, 587 mSolverCounterSat, 615 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 563 SdHoareTripleChecker+Valid, 420 SdHoareTripleChecker+Invalid, 1202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 615 IncrementalHoareTripleChecker+Valid, 587 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-04-02 15:14:03,713 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [563 Valid, 420 Invalid, 1202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [615 Valid, 587 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-04-02 15:14:03,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 577 states. [2023-04-02 15:14:03,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 577 to 163. [2023-04-02 15:14:03,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 101 states have (on average 1.1287128712871286) internal successors, (114), 101 states have internal predecessors, (114), 48 states have call successors, (48), 15 states have call predecessors, (48), 13 states have return successors, (46), 46 states have call predecessors, (46), 46 states have call successors, (46) [2023-04-02 15:14:03,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 208 transitions. [2023-04-02 15:14:03,825 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 208 transitions. Word has length 46 [2023-04-02 15:14:03,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:14:03,825 INFO L495 AbstractCegarLoop]: Abstraction has 163 states and 208 transitions. [2023-04-02 15:14:03,826 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 24 states have internal predecessors, (37), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:14:03,826 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 208 transitions. [2023-04-02 15:14:03,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-04-02 15:14:03,826 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:14:03,826 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:14:03,832 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2023-04-02 15:14:04,027 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:14:04,027 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:14:04,027 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:14:04,027 INFO L85 PathProgramCache]: Analyzing trace with hash 1446194112, now seen corresponding path program 18 times [2023-04-02 15:14:04,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:14:04,027 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [364858043] [2023-04-02 15:14:04,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:14:04,028 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:14:04,041 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:14:04,042 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [272694404] [2023-04-02 15:14:04,042 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:14:04,042 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:14:04,042 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:14:04,043 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:14:04,055 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-04-02 15:14:04,216 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:14:04,217 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:14:04,219 INFO L262 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 16 conjunts are in the unsatisfiable core [2023-04-02 15:14:04,220 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:14:04,365 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 29 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 15:14:04,365 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:14:04,493 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 15:14:04,494 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:14:04,494 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [364858043] [2023-04-02 15:14:04,494 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:14:04,494 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [272694404] [2023-04-02 15:14:04,494 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [272694404] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:14:04,494 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1593702634] [2023-04-02 15:14:04,495 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:14:04,495 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:14:04,495 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:14:04,495 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:14:04,496 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:14:04,508 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:14:04,854 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:14:04,858 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:14:04,859 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:14:04,861 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:14:06,579 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13249#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:14:06,579 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:14:06,579 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:14:06,580 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 24 [2023-04-02 15:14:06,580 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433206677] [2023-04-02 15:14:06,580 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:14:06,580 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-04-02 15:14:06,580 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:14:06,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-04-02 15:14:06,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=1963, Unknown=0, NotChecked=0, Total=2256 [2023-04-02 15:14:06,581 INFO L87 Difference]: Start difference. First operand 163 states and 208 transitions. Second operand has 24 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 24 states have internal predecessors, (37), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:14:07,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:14:07,425 INFO L93 Difference]: Finished difference Result 264 states and 342 transitions. [2023-04-02 15:14:07,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-04-02 15:14:07,426 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 24 states have internal predecessors, (37), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 46 [2023-04-02 15:14:07,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:14:07,427 INFO L225 Difference]: With dead ends: 264 [2023-04-02 15:14:07,427 INFO L226 Difference]: Without dead ends: 259 [2023-04-02 15:14:07,427 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 83 SyntacticMatches, 8 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1331 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=421, Invalid=2771, Unknown=0, NotChecked=0, Total=3192 [2023-04-02 15:14:07,428 INFO L413 NwaCegarLoop]: 80 mSDtfsCounter, 146 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 548 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 366 SdHoareTripleChecker+Invalid, 705 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 548 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-04-02 15:14:07,428 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [150 Valid, 366 Invalid, 705 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 548 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-04-02 15:14:07,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2023-04-02 15:14:07,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 164. [2023-04-02 15:14:07,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 102 states have (on average 1.1274509803921569) internal successors, (115), 102 states have internal predecessors, (115), 48 states have call successors, (48), 15 states have call predecessors, (48), 13 states have return successors, (46), 46 states have call predecessors, (46), 46 states have call successors, (46) [2023-04-02 15:14:07,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 209 transitions. [2023-04-02 15:14:07,513 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 209 transitions. Word has length 46 [2023-04-02 15:14:07,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:14:07,513 INFO L495 AbstractCegarLoop]: Abstraction has 164 states and 209 transitions. [2023-04-02 15:14:07,513 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 24 states have internal predecessors, (37), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:14:07,513 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 209 transitions. [2023-04-02 15:14:07,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-04-02 15:14:07,514 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:14:07,514 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:14:07,520 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2023-04-02 15:14:07,714 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2023-04-02 15:14:07,715 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:14:07,715 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:14:07,715 INFO L85 PathProgramCache]: Analyzing trace with hash 1807238541, now seen corresponding path program 19 times [2023-04-02 15:14:07,715 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:14:07,715 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1192411915] [2023-04-02 15:14:07,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:14:07,715 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:14:07,731 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:14:07,731 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2071967337] [2023-04-02 15:14:07,731 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:14:07,731 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:14:07,731 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:14:07,732 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:14:07,759 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-04-02 15:14:08,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:14:08,186 WARN L260 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 166 conjunts are in the unsatisfiable core [2023-04-02 15:14:08,192 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:14:08,209 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-04-02 15:14:08,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:14:08,243 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2023-04-02 15:14:08,246 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2023-04-02 15:14:08,249 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-02 15:14:08,253 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-02 15:14:08,284 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2023-04-02 15:14:08,327 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 55 [2023-04-02 15:14:08,381 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 75 [2023-04-02 15:14:08,453 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 11 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 84 treesize of output 95 [2023-04-02 15:14:08,556 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 16 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 98 treesize of output 115 [2023-04-02 15:14:08,702 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 12 select indices, 12 select index equivalence classes, 22 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 0 case distinctions, treesize of input 112 treesize of output 135 [2023-04-02 15:14:10,396 INFO L321 Elim1Store]: treesize reduction 182, result has 46.0 percent of original size [2023-04-02 15:14:10,397 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 14 select indices, 14 select index equivalence classes, 23 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 14 case distinctions, treesize of input 132 treesize of output 217 [2023-04-02 15:14:14,982 INFO L321 Elim1Store]: treesize reduction 53, result has 7.0 percent of original size [2023-04-02 15:14:14,983 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 21 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 600 treesize of output 276 [2023-04-02 15:14:15,121 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 8 proven. 65 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-02 15:14:15,121 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:14:17,605 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:14:17,605 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1192411915] [2023-04-02 15:14:17,605 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:14:17,605 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2071967337] [2023-04-02 15:14:17,605 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2071967337] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:14:17,605 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1145440475] [2023-04-02 15:14:17,606 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:14:17,606 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:14:17,607 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:14:17,607 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:14:17,607 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:14:17,624 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:14:17,984 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:14:17,988 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:14:17,989 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:14:17,991 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:14:21,335 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14229#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:14:21,336 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:14:21,336 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-04-02 15:14:21,336 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2023-04-02 15:14:21,336 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308555497] [2023-04-02 15:14:21,336 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-04-02 15:14:21,336 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-04-02 15:14:21,336 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:14:21,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-04-02 15:14:21,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=341, Invalid=4351, Unknown=0, NotChecked=0, Total=4692 [2023-04-02 15:14:21,339 INFO L87 Difference]: Start difference. First operand 164 states and 209 transitions. Second operand has 31 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 6 states have call successors, (8), 4 states have call predecessors, (8), 5 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2023-04-02 15:14:25,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:14:25,824 INFO L93 Difference]: Finished difference Result 213 states and 270 transitions. [2023-04-02 15:14:25,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-04-02 15:14:25,825 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 6 states have call successors, (8), 4 states have call predecessors, (8), 5 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 47 [2023-04-02 15:14:25,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:14:25,826 INFO L225 Difference]: With dead ends: 213 [2023-04-02 15:14:25,826 INFO L226 Difference]: Without dead ends: 208 [2023-04-02 15:14:25,827 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 46 SyntacticMatches, 4 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2099 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=511, Invalid=6799, Unknown=0, NotChecked=0, Total=7310 [2023-04-02 15:14:25,827 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 83 mSDsluCounter, 274 mSDsCounter, 0 mSdLazyCounter, 1397 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 300 SdHoareTripleChecker+Invalid, 1468 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 1397 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2023-04-02 15:14:25,827 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 300 Invalid, 1468 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 1397 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2023-04-02 15:14:25,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2023-04-02 15:14:25,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 178. [2023-04-02 15:14:25,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 111 states have (on average 1.135135135135135) internal successors, (126), 111 states have internal predecessors, (126), 52 states have call successors, (52), 16 states have call predecessors, (52), 14 states have return successors, (50), 50 states have call predecessors, (50), 50 states have call successors, (50) [2023-04-02 15:14:25,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 228 transitions. [2023-04-02 15:14:25,961 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 228 transitions. Word has length 47 [2023-04-02 15:14:25,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:14:25,962 INFO L495 AbstractCegarLoop]: Abstraction has 178 states and 228 transitions. [2023-04-02 15:14:25,962 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 6 states have call successors, (8), 4 states have call predecessors, (8), 5 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2023-04-02 15:14:25,962 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 228 transitions. [2023-04-02 15:14:25,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-04-02 15:14:25,963 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:14:25,963 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:14:25,975 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2023-04-02 15:14:26,170 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-04-02 15:14:26,171 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:14:26,171 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:14:26,171 INFO L85 PathProgramCache]: Analyzing trace with hash 114713952, now seen corresponding path program 20 times [2023-04-02 15:14:26,171 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:14:26,171 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2105324077] [2023-04-02 15:14:26,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:14:26,171 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:14:26,186 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:14:26,186 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1710240009] [2023-04-02 15:14:26,186 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:14:26,186 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:14:26,186 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:14:26,187 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:14:26,196 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-04-02 15:14:26,442 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-04-02 15:14:26,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:14:26,444 INFO L262 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 18 conjunts are in the unsatisfiable core [2023-04-02 15:14:26,445 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:14:26,589 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 44 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 15:14:26,589 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:14:26,733 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 15:14:26,733 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:14:26,733 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2105324077] [2023-04-02 15:14:26,733 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:14:26,733 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1710240009] [2023-04-02 15:14:26,733 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1710240009] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:14:26,734 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [336045232] [2023-04-02 15:14:26,736 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:14:26,736 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:14:26,736 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:14:26,736 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:14:26,737 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:14:26,752 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:14:27,112 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:14:27,116 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:14:27,117 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:14:27,119 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:14:28,994 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15225#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:14:28,994 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:14:28,994 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:14:28,994 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 27 [2023-04-02 15:14:28,994 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681307245] [2023-04-02 15:14:28,994 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:14:28,994 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-04-02 15:14:28,994 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:14:28,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-04-02 15:14:28,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=2168, Unknown=0, NotChecked=0, Total=2550 [2023-04-02 15:14:28,995 INFO L87 Difference]: Start difference. First operand 178 states and 228 transitions. Second operand has 27 states, 27 states have (on average 1.4814814814814814) internal successors, (40), 27 states have internal predecessors, (40), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:14:30,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:14:30,919 INFO L93 Difference]: Finished difference Result 779 states and 1072 transitions. [2023-04-02 15:14:30,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2023-04-02 15:14:30,920 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.4814814814814814) internal successors, (40), 27 states have internal predecessors, (40), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 48 [2023-04-02 15:14:30,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:14:30,923 INFO L225 Difference]: With dead ends: 779 [2023-04-02 15:14:30,923 INFO L226 Difference]: Without dead ends: 764 [2023-04-02 15:14:30,924 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 85 SyntacticMatches, 9 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2265 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1019, Invalid=5953, Unknown=0, NotChecked=0, Total=6972 [2023-04-02 15:14:30,924 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 761 mSDsluCounter, 433 mSDsCounter, 0 mSdLazyCounter, 697 mSolverCounterSat, 891 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 797 SdHoareTripleChecker+Valid, 517 SdHoareTripleChecker+Invalid, 1588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 891 IncrementalHoareTripleChecker+Valid, 697 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-04-02 15:14:30,924 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [797 Valid, 517 Invalid, 1588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [891 Valid, 697 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-04-02 15:14:30,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 764 states. [2023-04-02 15:14:31,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 764 to 189. [2023-04-02 15:14:31,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 117 states have (on average 1.1282051282051282) internal successors, (132), 117 states have internal predecessors, (132), 56 states have call successors, (56), 17 states have call predecessors, (56), 15 states have return successors, (54), 54 states have call predecessors, (54), 54 states have call successors, (54) [2023-04-02 15:14:31,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 242 transitions. [2023-04-02 15:14:31,077 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 242 transitions. Word has length 48 [2023-04-02 15:14:31,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:14:31,077 INFO L495 AbstractCegarLoop]: Abstraction has 189 states and 242 transitions. [2023-04-02 15:14:31,078 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.4814814814814814) internal successors, (40), 27 states have internal predecessors, (40), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:14:31,078 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 242 transitions. [2023-04-02 15:14:31,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-04-02 15:14:31,078 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:14:31,079 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:14:31,088 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2023-04-02 15:14:31,286 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:14:31,286 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:14:31,286 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:14:31,287 INFO L85 PathProgramCache]: Analyzing trace with hash -1390989250, now seen corresponding path program 21 times [2023-04-02 15:14:31,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:14:31,287 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [544189921] [2023-04-02 15:14:31,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:14:31,287 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:14:31,303 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:14:31,303 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1646929515] [2023-04-02 15:14:31,303 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:14:31,303 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:14:31,304 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:14:31,305 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:14:31,324 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-04-02 15:14:31,662 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:14:31,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:14:31,664 INFO L262 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 18 conjunts are in the unsatisfiable core [2023-04-02 15:14:31,665 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:14:31,813 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 36 proven. 36 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 15:14:31,813 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:14:31,960 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 15:14:31,960 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:14:31,960 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [544189921] [2023-04-02 15:14:31,960 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:14:31,960 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1646929515] [2023-04-02 15:14:31,960 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1646929515] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:14:31,960 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1313578486] [2023-04-02 15:14:31,961 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:14:31,961 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:14:31,962 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:14:31,962 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:14:31,962 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:14:31,980 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:14:32,342 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:14:32,346 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:14:32,347 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:14:32,349 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:14:34,090 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17169#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:14:34,091 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:14:34,091 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:14:34,091 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 27 [2023-04-02 15:14:34,091 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [26363079] [2023-04-02 15:14:34,091 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:14:34,091 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-04-02 15:14:34,091 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:14:34,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-04-02 15:14:34,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=2221, Unknown=0, NotChecked=0, Total=2550 [2023-04-02 15:14:34,092 INFO L87 Difference]: Start difference. First operand 189 states and 242 transitions. Second operand has 27 states, 27 states have (on average 1.4814814814814814) internal successors, (40), 27 states have internal predecessors, (40), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:14:34,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:14:34,875 INFO L93 Difference]: Finished difference Result 308 states and 399 transitions. [2023-04-02 15:14:34,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-04-02 15:14:34,875 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.4814814814814814) internal successors, (40), 27 states have internal predecessors, (40), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 48 [2023-04-02 15:14:34,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:14:34,876 INFO L225 Difference]: With dead ends: 308 [2023-04-02 15:14:34,876 INFO L226 Difference]: Without dead ends: 303 [2023-04-02 15:14:34,877 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 85 SyntacticMatches, 9 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1559 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=486, Invalid=3174, Unknown=0, NotChecked=0, Total=3660 [2023-04-02 15:14:34,877 INFO L413 NwaCegarLoop]: 90 mSDtfsCounter, 201 mSDsluCounter, 387 mSDsCounter, 0 mSdLazyCounter, 500 mSolverCounterSat, 215 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 477 SdHoareTripleChecker+Invalid, 715 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 215 IncrementalHoareTripleChecker+Valid, 500 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-02 15:14:34,877 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [205 Valid, 477 Invalid, 715 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [215 Valid, 500 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-02 15:14:34,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2023-04-02 15:14:34,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 190. [2023-04-02 15:14:34,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 118 states have (on average 1.1271186440677967) internal successors, (133), 118 states have internal predecessors, (133), 56 states have call successors, (56), 17 states have call predecessors, (56), 15 states have return successors, (54), 54 states have call predecessors, (54), 54 states have call successors, (54) [2023-04-02 15:14:34,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 243 transitions. [2023-04-02 15:14:34,984 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 243 transitions. Word has length 48 [2023-04-02 15:14:34,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:14:34,984 INFO L495 AbstractCegarLoop]: Abstraction has 190 states and 243 transitions. [2023-04-02 15:14:34,984 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.4814814814814814) internal successors, (40), 27 states have internal predecessors, (40), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:14:34,984 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 243 transitions. [2023-04-02 15:14:34,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-04-02 15:14:34,985 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:14:34,985 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:14:34,992 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2023-04-02 15:14:35,192 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:14:35,192 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:14:35,193 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:14:35,193 INFO L85 PathProgramCache]: Analyzing trace with hash -246099761, now seen corresponding path program 22 times [2023-04-02 15:14:35,193 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:14:35,193 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [286946473] [2023-04-02 15:14:35,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:14:35,193 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:14:35,213 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:14:35,213 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1702357988] [2023-04-02 15:14:35,213 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:14:35,213 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:14:35,213 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:14:35,214 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:14:35,235 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-04-02 15:14:35,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:14:35,652 WARN L260 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 187 conjunts are in the unsatisfiable core [2023-04-02 15:14:35,658 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:14:35,673 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-04-02 15:14:35,696 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:14:35,699 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2023-04-02 15:14:35,702 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2023-04-02 15:14:35,704 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-02 15:14:35,708 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-02 15:14:35,744 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2023-04-02 15:14:35,786 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 55 [2023-04-02 15:14:35,837 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 75 [2023-04-02 15:14:35,909 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 11 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 84 treesize of output 95 [2023-04-02 15:14:35,988 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 16 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 98 treesize of output 115 [2023-04-02 15:14:36,082 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 12 select indices, 12 select index equivalence classes, 22 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 0 case distinctions, treesize of input 112 treesize of output 135 [2023-04-02 15:14:36,189 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 14 select indices, 14 select index equivalence classes, 29 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 0 case distinctions, treesize of input 126 treesize of output 155 [2023-04-02 15:14:38,239 INFO L321 Elim1Store]: treesize reduction 208, result has 46.0 percent of original size [2023-04-02 15:14:38,240 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 16 select indices, 16 select index equivalence classes, 30 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 16 case distinctions, treesize of input 146 treesize of output 245 [2023-04-02 15:14:45,092 INFO L321 Elim1Store]: treesize reduction 61, result has 6.2 percent of original size [2023-04-02 15:14:45,092 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 28 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 120 case distinctions, treesize of input 744 treesize of output 340 [2023-04-02 15:14:45,265 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 8 proven. 80 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 15:14:45,265 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:14:49,281 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:14:49,281 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [286946473] [2023-04-02 15:14:49,282 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:14:49,282 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1702357988] [2023-04-02 15:14:49,282 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1702357988] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:14:49,282 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1687817385] [2023-04-02 15:14:49,289 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:14:49,289 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:14:49,289 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:14:49,290 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:14:49,290 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:14:49,309 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:14:49,677 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:14:49,680 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:14:49,681 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:14:49,684 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:14:53,700 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18280#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:14:53,701 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:14:53,701 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-04-02 15:14:53,701 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2023-04-02 15:14:53,701 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565397800] [2023-04-02 15:14:53,701 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-04-02 15:14:53,701 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2023-04-02 15:14:53,701 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:14:53,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2023-04-02 15:14:53,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=398, Invalid=5302, Unknown=0, NotChecked=0, Total=5700 [2023-04-02 15:14:53,702 INFO L87 Difference]: Start difference. First operand 190 states and 243 transitions. Second operand has 34 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 28 states have internal predecessors, (33), 6 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2023-04-02 15:14:59,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:14:59,867 INFO L93 Difference]: Finished difference Result 241 states and 306 transitions. [2023-04-02 15:14:59,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2023-04-02 15:14:59,867 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 28 states have internal predecessors, (33), 6 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 49 [2023-04-02 15:14:59,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:14:59,868 INFO L225 Difference]: With dead ends: 241 [2023-04-02 15:14:59,868 INFO L226 Difference]: Without dead ends: 236 [2023-04-02 15:14:59,869 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2579 ImplicationChecksByTransitivity, 14.2s TimeCoverageRelationStatistics Valid=614, Invalid=8316, Unknown=0, NotChecked=0, Total=8930 [2023-04-02 15:14:59,869 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 79 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 1572 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 1652 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 1572 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2023-04-02 15:14:59,869 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 317 Invalid, 1652 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 1572 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2023-04-02 15:14:59,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2023-04-02 15:15:00,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 204. [2023-04-02 15:15:00,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 127 states have (on average 1.1338582677165354) internal successors, (144), 127 states have internal predecessors, (144), 60 states have call successors, (60), 18 states have call predecessors, (60), 16 states have return successors, (58), 58 states have call predecessors, (58), 58 states have call successors, (58) [2023-04-02 15:15:00,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 262 transitions. [2023-04-02 15:15:00,048 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 262 transitions. Word has length 49 [2023-04-02 15:15:00,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:15:00,048 INFO L495 AbstractCegarLoop]: Abstraction has 204 states and 262 transitions. [2023-04-02 15:15:00,054 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 28 states have internal predecessors, (33), 6 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2023-04-02 15:15:00,055 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 262 transitions. [2023-04-02 15:15:00,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-04-02 15:15:00,056 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:15:00,056 INFO L195 NwaCegarLoop]: trace histogram [9, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:15:00,067 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2023-04-02 15:15:00,264 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-04-02 15:15:00,264 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:15:00,265 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:15:00,265 INFO L85 PathProgramCache]: Analyzing trace with hash -1254370583, now seen corresponding path program 1 times [2023-04-02 15:15:00,265 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:15:00,265 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [689539725] [2023-04-02 15:15:00,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:15:00,265 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:15:00,283 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:15:00,283 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1574918452] [2023-04-02 15:15:00,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:15:00,283 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:15:00,283 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:15:00,284 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:15:00,288 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-04-02 15:15:00,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:15:00,578 INFO L262 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 113 conjunts are in the unsatisfiable core [2023-04-02 15:15:00,582 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:15:00,600 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-04-02 15:15:00,633 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:15:00,635 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2023-04-02 15:15:00,639 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2023-04-02 15:15:00,642 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-02 15:15:00,648 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-02 15:15:00,688 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2023-04-02 15:15:01,369 INFO L321 Elim1Store]: treesize reduction 52, result has 46.4 percent of original size [2023-04-02 15:15:01,369 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 62 treesize of output 77 [2023-04-02 15:15:02,747 INFO L321 Elim1Store]: treesize reduction 257, result has 28.2 percent of original size [2023-04-02 15:15:02,748 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 2 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 86 treesize of output 136 [2023-04-02 15:15:03,080 INFO L321 Elim1Store]: treesize reduction 36, result has 36.8 percent of original size [2023-04-02 15:15:03,081 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 84 treesize of output 58 [2023-04-02 15:15:03,149 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 14 proven. 61 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 15:15:03,150 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:15:04,727 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:15:04,728 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [689539725] [2023-04-02 15:15:04,728 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:15:04,728 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1574918452] [2023-04-02 15:15:04,728 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1574918452] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:15:04,728 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1489089146] [2023-04-02 15:15:04,729 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:15:04,729 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:15:04,729 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:15:04,730 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:15:04,730 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:15:04,742 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:15:05,578 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:15:05,582 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:15:05,583 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:15:05,585 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:15:08,593 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19311#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:15:08,593 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:15:08,593 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-04-02 15:15:08,593 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2023-04-02 15:15:08,593 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765534432] [2023-04-02 15:15:08,593 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-04-02 15:15:08,593 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-04-02 15:15:08,593 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:15:08,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-04-02 15:15:08,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=354, Invalid=3806, Unknown=0, NotChecked=0, Total=4160 [2023-04-02 15:15:08,595 INFO L87 Difference]: Start difference. First operand 204 states and 262 transitions. Second operand has 29 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 20 states have internal predecessors, (28), 9 states have call successors, (12), 5 states have call predecessors, (12), 6 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2023-04-02 15:15:10,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:15:10,088 INFO L93 Difference]: Finished difference Result 238 states and 303 transitions. [2023-04-02 15:15:10,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-04-02 15:15:10,088 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 20 states have internal predecessors, (28), 9 states have call successors, (12), 5 states have call predecessors, (12), 6 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) Word has length 54 [2023-04-02 15:15:10,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:15:10,089 INFO L225 Difference]: With dead ends: 238 [2023-04-02 15:15:10,090 INFO L226 Difference]: Without dead ends: 229 [2023-04-02 15:15:10,092 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 58 SyntacticMatches, 5 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2015 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=508, Invalid=5344, Unknown=0, NotChecked=0, Total=5852 [2023-04-02 15:15:10,093 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 40 mSDsluCounter, 193 mSDsCounter, 0 mSdLazyCounter, 563 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 591 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 563 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-04-02 15:15:10,094 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 224 Invalid, 591 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 563 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-04-02 15:15:10,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2023-04-02 15:15:10,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 215. [2023-04-02 15:15:10,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 133 states have (on average 1.1278195488721805) internal successors, (150), 133 states have internal predecessors, (150), 64 states have call successors, (64), 19 states have call predecessors, (64), 17 states have return successors, (62), 62 states have call predecessors, (62), 62 states have call successors, (62) [2023-04-02 15:15:10,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 276 transitions. [2023-04-02 15:15:10,217 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 276 transitions. Word has length 54 [2023-04-02 15:15:10,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:15:10,217 INFO L495 AbstractCegarLoop]: Abstraction has 215 states and 276 transitions. [2023-04-02 15:15:10,217 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 20 states have internal predecessors, (28), 9 states have call successors, (12), 5 states have call predecessors, (12), 6 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2023-04-02 15:15:10,217 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 276 transitions. [2023-04-02 15:15:10,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-04-02 15:15:10,218 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:15:10,218 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:15:10,224 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2023-04-02 15:15:10,420 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2023-04-02 15:15:10,420 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:15:10,420 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:15:10,420 INFO L85 PathProgramCache]: Analyzing trace with hash 885736030, now seen corresponding path program 23 times [2023-04-02 15:15:10,421 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:15:10,421 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1904774244] [2023-04-02 15:15:10,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:15:10,421 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:15:10,438 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:15:10,439 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2081746756] [2023-04-02 15:15:10,439 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:15:10,439 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:15:10,439 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:15:10,440 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:15:10,443 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2023-04-02 15:15:10,865 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-04-02 15:15:10,865 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:15:10,867 INFO L262 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 20 conjunts are in the unsatisfiable core [2023-04-02 15:15:10,869 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:15:11,052 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 53 proven. 36 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 15:15:11,052 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:15:11,230 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 15:15:11,230 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:15:11,230 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1904774244] [2023-04-02 15:15:11,230 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:15:11,230 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2081746756] [2023-04-02 15:15:11,230 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2081746756] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:15:11,230 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [354227563] [2023-04-02 15:15:11,231 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:15:11,231 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:15:11,231 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:15:11,231 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:15:11,231 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:15:11,245 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:15:11,586 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:15:11,590 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:15:11,592 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:15:11,594 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:15:13,508 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20407#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:15:13,509 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:15:13,509 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:15:13,509 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 30 [2023-04-02 15:15:13,509 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2119088831] [2023-04-02 15:15:13,509 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:15:13,509 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2023-04-02 15:15:13,509 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:15:13,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2023-04-02 15:15:13,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=433, Invalid=2429, Unknown=0, NotChecked=0, Total=2862 [2023-04-02 15:15:13,510 INFO L87 Difference]: Start difference. First operand 215 states and 276 transitions. Second operand has 30 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 30 states have internal predecessors, (43), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:15:16,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:15:16,275 INFO L93 Difference]: Finished difference Result 994 states and 1367 transitions. [2023-04-02 15:15:16,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2023-04-02 15:15:16,275 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 30 states have internal predecessors, (43), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 50 [2023-04-02 15:15:16,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:15:16,279 INFO L225 Difference]: With dead ends: 994 [2023-04-02 15:15:16,279 INFO L226 Difference]: Without dead ends: 978 [2023-04-02 15:15:16,280 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 87 SyntacticMatches, 10 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2964 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1330, Invalid=7790, Unknown=0, NotChecked=0, Total=9120 [2023-04-02 15:15:16,280 INFO L413 NwaCegarLoop]: 95 mSDtfsCounter, 1150 mSDsluCounter, 403 mSDsCounter, 0 mSdLazyCounter, 727 mSolverCounterSat, 1314 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1190 SdHoareTripleChecker+Valid, 498 SdHoareTripleChecker+Invalid, 2041 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1314 IncrementalHoareTripleChecker+Valid, 727 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2023-04-02 15:15:16,280 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1190 Valid, 498 Invalid, 2041 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1314 Valid, 727 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2023-04-02 15:15:16,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 978 states. [2023-04-02 15:15:16,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 978 to 226. [2023-04-02 15:15:16,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 139 states have (on average 1.1223021582733812) internal successors, (156), 139 states have internal predecessors, (156), 68 states have call successors, (68), 20 states have call predecessors, (68), 18 states have return successors, (66), 66 states have call predecessors, (66), 66 states have call successors, (66) [2023-04-02 15:15:16,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 290 transitions. [2023-04-02 15:15:16,474 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 290 transitions. Word has length 50 [2023-04-02 15:15:16,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:15:16,474 INFO L495 AbstractCegarLoop]: Abstraction has 226 states and 290 transitions. [2023-04-02 15:15:16,475 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 30 states have internal predecessors, (43), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:15:16,475 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 290 transitions. [2023-04-02 15:15:16,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-04-02 15:15:16,476 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:15:16,476 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:15:16,483 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2023-04-02 15:15:16,683 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2023-04-02 15:15:16,684 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:15:16,684 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:15:16,684 INFO L85 PathProgramCache]: Analyzing trace with hash 1453577024, now seen corresponding path program 24 times [2023-04-02 15:15:16,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:15:16,684 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [245704268] [2023-04-02 15:15:16,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:15:16,684 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:15:16,703 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:15:16,703 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1058946684] [2023-04-02 15:15:16,703 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:15:16,703 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:15:16,703 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:15:16,704 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:15:16,708 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2023-04-02 15:15:17,088 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:15:17,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:15:17,091 INFO L262 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 20 conjunts are in the unsatisfiable core [2023-04-02 15:15:17,092 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:15:17,265 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 44 proven. 45 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 15:15:17,265 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:15:17,425 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 15:15:17,425 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:15:17,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [245704268] [2023-04-02 15:15:17,425 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:15:17,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1058946684] [2023-04-02 15:15:17,425 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1058946684] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:15:17,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1227169527] [2023-04-02 15:15:17,426 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:15:17,426 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:15:17,427 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:15:17,427 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:15:17,427 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:15:17,438 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:15:17,813 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:15:17,818 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:15:17,820 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:15:17,823 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:15:19,598 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22788#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:15:19,598 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:15:19,598 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:15:19,598 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 30 [2023-04-02 15:15:19,598 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273493122] [2023-04-02 15:15:19,598 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:15:19,598 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2023-04-02 15:15:19,598 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:15:19,599 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2023-04-02 15:15:19,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=369, Invalid=2493, Unknown=0, NotChecked=0, Total=2862 [2023-04-02 15:15:19,599 INFO L87 Difference]: Start difference. First operand 226 states and 290 transitions. Second operand has 30 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 30 states have internal predecessors, (43), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:15:20,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:15:20,605 INFO L93 Difference]: Finished difference Result 364 states and 471 transitions. [2023-04-02 15:15:20,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-04-02 15:15:20,605 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 30 states have internal predecessors, (43), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 50 [2023-04-02 15:15:20,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:15:20,607 INFO L225 Difference]: With dead ends: 364 [2023-04-02 15:15:20,607 INFO L226 Difference]: Without dead ends: 359 [2023-04-02 15:15:20,607 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 87 SyntacticMatches, 10 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1799 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=558, Invalid=3602, Unknown=0, NotChecked=0, Total=4160 [2023-04-02 15:15:20,607 INFO L413 NwaCegarLoop]: 100 mSDtfsCounter, 237 mSDsluCounter, 378 mSDsCounter, 0 mSdLazyCounter, 620 mSolverCounterSat, 258 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 478 SdHoareTripleChecker+Invalid, 878 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 258 IncrementalHoareTripleChecker+Valid, 620 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-04-02 15:15:20,607 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [241 Valid, 478 Invalid, 878 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [258 Valid, 620 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-04-02 15:15:20,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2023-04-02 15:15:20,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 227. [2023-04-02 15:15:20,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 140 states have (on average 1.1214285714285714) internal successors, (157), 140 states have internal predecessors, (157), 68 states have call successors, (68), 20 states have call predecessors, (68), 18 states have return successors, (66), 66 states have call predecessors, (66), 66 states have call successors, (66) [2023-04-02 15:15:20,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 291 transitions. [2023-04-02 15:15:20,808 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 291 transitions. Word has length 50 [2023-04-02 15:15:20,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:15:20,808 INFO L495 AbstractCegarLoop]: Abstraction has 227 states and 291 transitions. [2023-04-02 15:15:20,808 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 30 states have internal predecessors, (43), 3 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 15:15:20,808 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 291 transitions. [2023-04-02 15:15:20,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2023-04-02 15:15:20,809 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:15:20,809 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:15:20,823 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2023-04-02 15:15:21,017 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2023-04-02 15:15:21,017 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:15:21,017 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:15:21,017 INFO L85 PathProgramCache]: Analyzing trace with hash 2036108813, now seen corresponding path program 25 times [2023-04-02 15:15:21,017 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:15:21,017 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [632185969] [2023-04-02 15:15:21,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:15:21,018 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:15:21,033 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:15:21,033 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1741756264] [2023-04-02 15:15:21,034 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:15:21,034 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:15:21,034 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:15:21,035 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:15:21,059 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2023-04-02 15:15:21,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:15:21,591 WARN L260 TraceCheckSpWp]: Trace formula consists of 326 conjuncts, 198 conjunts are in the unsatisfiable core [2023-04-02 15:15:21,597 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:15:21,615 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-04-02 15:15:21,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:15:21,641 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2023-04-02 15:15:21,645 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2023-04-02 15:15:21,647 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-02 15:15:21,651 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-02 15:15:21,680 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2023-04-02 15:15:21,722 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 55 [2023-04-02 15:15:21,775 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 75 [2023-04-02 15:15:21,850 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 11 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 84 treesize of output 95 [2023-04-02 15:15:21,928 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 16 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 98 treesize of output 115 [2023-04-02 15:15:22,028 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 12 select indices, 12 select index equivalence classes, 22 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 0 case distinctions, treesize of input 112 treesize of output 135 [2023-04-02 15:15:22,158 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 14 select indices, 14 select index equivalence classes, 29 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 0 case distinctions, treesize of input 126 treesize of output 155 [2023-04-02 15:15:22,282 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 16 select indices, 16 select index equivalence classes, 37 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 0 case distinctions, treesize of input 140 treesize of output 175 [2023-04-02 15:15:24,491 INFO L321 Elim1Store]: treesize reduction 234, result has 46.0 percent of original size [2023-04-02 15:15:24,491 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 18 select indices, 18 select index equivalence classes, 38 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 18 case distinctions, treesize of input 160 treesize of output 273 [2023-04-02 15:15:34,656 INFO L321 Elim1Store]: treesize reduction 69, result has 5.5 percent of original size [2023-04-02 15:15:34,656 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 36 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 902 treesize of output 410 [2023-04-02 15:15:34,855 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 7 proven. 100 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-02 15:15:34,855 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:15:38,217 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:15:38,217 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [632185969] [2023-04-02 15:15:38,217 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:15:38,217 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1741756264] [2023-04-02 15:15:38,217 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1741756264] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:15:38,217 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1004388098] [2023-04-02 15:15:38,218 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-02 15:15:38,218 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:15:38,219 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:15:38,219 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:15:38,219 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:15:38,231 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:15:38,568 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 15:15:38,572 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2023-04-02 15:15:38,573 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:15:38,575 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:15:42,449 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24058#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:15:42,449 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:15:42,449 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-04-02 15:15:42,449 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2023-04-02 15:15:42,449 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516304827] [2023-04-02 15:15:42,449 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-04-02 15:15:42,449 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-04-02 15:15:42,449 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:15:42,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-04-02 15:15:42,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=369, Invalid=5181, Unknown=0, NotChecked=0, Total=5550 [2023-04-02 15:15:42,451 INFO L87 Difference]: Start difference. First operand 227 states and 291 transitions. Second operand has 35 states, 30 states have (on average 1.2) internal successors, (36), 31 states have internal predecessors, (36), 6 states have call successors, (8), 4 states have call predecessors, (8), 5 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2023-04-02 15:15:49,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:15:49,276 INFO L93 Difference]: Finished difference Result 280 states and 356 transitions. [2023-04-02 15:15:49,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2023-04-02 15:15:49,277 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 30 states have (on average 1.2) internal successors, (36), 31 states have internal predecessors, (36), 6 states have call successors, (8), 4 states have call predecessors, (8), 5 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 51 [2023-04-02 15:15:49,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:15:49,278 INFO L225 Difference]: With dead ends: 280 [2023-04-02 15:15:49,278 INFO L226 Difference]: Without dead ends: 275 [2023-04-02 15:15:49,278 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 50 SyntacticMatches, 4 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2426 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=555, Invalid=8187, Unknown=0, NotChecked=0, Total=8742 [2023-04-02 15:15:49,279 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 98 mSDsluCounter, 253 mSDsCounter, 0 mSdLazyCounter, 1415 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 1496 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 1415 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2023-04-02 15:15:49,279 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 278 Invalid, 1496 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 1415 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2023-04-02 15:15:49,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2023-04-02 15:15:49,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 241. [2023-04-02 15:15:49,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 149 states have (on average 1.1275167785234899) internal successors, (168), 149 states have internal predecessors, (168), 72 states have call successors, (72), 21 states have call predecessors, (72), 19 states have return successors, (70), 70 states have call predecessors, (70), 70 states have call successors, (70) [2023-04-02 15:15:49,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 310 transitions. [2023-04-02 15:15:49,453 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 310 transitions. Word has length 51 [2023-04-02 15:15:49,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:15:49,453 INFO L495 AbstractCegarLoop]: Abstraction has 241 states and 310 transitions. [2023-04-02 15:15:49,453 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 30 states have (on average 1.2) internal successors, (36), 31 states have internal predecessors, (36), 6 states have call successors, (8), 4 states have call predecessors, (8), 5 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2023-04-02 15:15:49,453 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 310 transitions. [2023-04-02 15:15:49,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2023-04-02 15:15:49,454 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:15:49,454 INFO L195 NwaCegarLoop]: trace histogram [9, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:15:49,461 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2023-04-02 15:15:49,655 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2023-04-02 15:15:49,655 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:15:49,655 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:15:49,655 INFO L85 PathProgramCache]: Analyzing trace with hash 32124213, now seen corresponding path program 2 times [2023-04-02 15:15:49,655 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:15:49,656 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [164508629] [2023-04-02 15:15:49,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:15:49,656 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:15:49,669 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:15:49,669 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1005112962] [2023-04-02 15:15:49,669 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:15:49,669 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:15:49,669 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:15:49,670 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:15:49,677 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2023-04-02 15:15:49,954 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-04-02 15:15:49,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:15:49,957 INFO L262 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 134 conjunts are in the unsatisfiable core [2023-04-02 15:15:49,961 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:15:49,971 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-04-02 15:15:49,986 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:15:49,988 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2023-04-02 15:15:49,991 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2023-04-02 15:15:49,993 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-02 15:15:49,997 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-02 15:15:50,040 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2023-04-02 15:15:50,092 INFO L321 Elim1Store]: treesize reduction 64, result has 31.2 percent of original size [2023-04-02 15:15:50,092 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 62 treesize of output 59 [2023-04-02 15:15:51,173 INFO L321 Elim1Store]: treesize reduction 138, result has 34.0 percent of original size [2023-04-02 15:15:51,174 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 3 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 13 case distinctions, treesize of input 89 treesize of output 112