/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-lopstr16/partial_lesser_bound.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 15:20:37,094 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 15:20:37,096 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 15:20:37,120 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 15:20:37,120 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 15:20:37,121 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 15:20:37,122 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 15:20:37,124 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 15:20:37,125 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 15:20:37,126 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 15:20:37,126 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 15:20:37,127 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 15:20:37,127 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 15:20:37,128 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 15:20:37,129 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 15:20:37,130 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 15:20:37,130 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 15:20:37,131 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 15:20:37,132 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 15:20:37,134 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 15:20:37,135 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 15:20:37,136 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 15:20:37,136 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 15:20:37,137 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 15:20:37,140 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-04-02 15:20:37,142 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 15:20:37,142 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 15:20:37,143 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 15:20:37,144 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 15:20:37,144 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 15:20:37,144 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 15:20:37,145 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 15:20:37,145 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 15:20:37,146 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 15:20:37,146 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 15:20:37,147 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 15:20:37,148 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 15:20:37,166 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 15:20:37,167 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 15:20:37,167 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 15:20:37,167 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 15:20:37,168 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 15:20:37,168 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 15:20:37,168 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 15:20:37,168 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 15:20:37,168 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 15:20:37,169 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 15:20:37,169 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 15:20:37,169 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 15:20:37,169 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 15:20:37,169 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 15:20:37,169 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 15:20:37,170 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 15:20:37,170 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 15:20:37,170 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 15:20:37,171 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 15:20:37,171 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 15:20:37,171 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 15:20:37,171 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 15:20:37,171 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 15:20:37,172 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 15:20:37,172 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 15:20:37,172 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 15:20:37,172 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 15:20:37,172 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 15:20:37,172 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 15:20:37,173 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 15:20:37,173 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 15:20:37,173 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 15:20:37,173 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 15:20:37,173 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 15:20:37,174 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 15:20:37,174 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 15:20:37,174 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 15:20:37,174 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 15:20:37,174 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 15:20:37,174 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 15:20:37,174 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 15:20:37,175 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 15:20:37,398 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 15:20:37,431 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 15:20:37,434 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 15:20:37,435 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 15:20:37,436 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 15:20:37,437 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-lopstr16/partial_lesser_bound.i [2023-04-02 15:20:38,611 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 15:20:38,784 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 15:20:38,784 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-lopstr16/partial_lesser_bound.i [2023-04-02 15:20:38,789 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bbfb74bdc/59e5e2f41a85478a8f42a8ae92722ca8/FLAGf23b6c15a [2023-04-02 15:20:38,806 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bbfb74bdc/59e5e2f41a85478a8f42a8ae92722ca8 [2023-04-02 15:20:38,809 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 15:20:38,810 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 15:20:38,813 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 15:20:38,813 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 15:20:38,816 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 15:20:38,816 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 03:20:38" (1/1) ... [2023-04-02 15:20:38,817 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@70ecfcec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:20:38, skipping insertion in model container [2023-04-02 15:20:38,817 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 03:20:38" (1/1) ... [2023-04-02 15:20:38,822 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 15:20:38,832 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 15:20:38,927 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-lopstr16/partial_lesser_bound.i[813,826] [2023-04-02 15:20:38,940 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 15:20:38,948 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 15:20:38,956 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-lopstr16/partial_lesser_bound.i[813,826] [2023-04-02 15:20:38,960 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 15:20:38,971 INFO L208 MainTranslator]: Completed translation [2023-04-02 15:20:38,972 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:20:38 WrapperNode [2023-04-02 15:20:38,972 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 15:20:38,973 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 15:20:38,973 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 15:20:38,973 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 15:20:38,979 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:20:38" (1/1) ... [2023-04-02 15:20:38,980 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:20:38" (1/1) ... [2023-04-02 15:20:38,985 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:20:38" (1/1) ... [2023-04-02 15:20:38,986 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:20:38" (1/1) ... [2023-04-02 15:20:38,991 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:20:38" (1/1) ... [2023-04-02 15:20:38,994 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:20:38" (1/1) ... [2023-04-02 15:20:38,997 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:20:38" (1/1) ... [2023-04-02 15:20:38,998 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:20:38" (1/1) ... [2023-04-02 15:20:39,000 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 15:20:39,009 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 15:20:39,010 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 15:20:39,010 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 15:20:39,011 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:20:38" (1/1) ... [2023-04-02 15:20:39,016 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 15:20:39,024 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:20:39,036 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 15:20:39,037 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 15:20:39,064 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 15:20:39,065 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 15:20:39,065 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 15:20:39,065 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 15:20:39,065 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 15:20:39,065 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 15:20:39,065 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 15:20:39,065 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-02 15:20:39,065 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-02 15:20:39,066 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 15:20:39,066 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 15:20:39,066 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 15:20:39,066 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2023-04-02 15:20:39,066 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 15:20:39,066 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-04-02 15:20:39,066 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-04-02 15:20:39,066 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-04-02 15:20:39,067 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 15:20:39,067 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 15:20:39,067 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 15:20:39,067 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 15:20:39,067 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 15:20:39,067 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 15:20:39,138 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 15:20:39,140 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 15:20:39,305 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 15:20:39,349 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 15:20:39,350 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-04-02 15:20:39,352 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 03:20:39 BoogieIcfgContainer [2023-04-02 15:20:39,352 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 15:20:39,354 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 15:20:39,354 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 15:20:39,357 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 15:20:39,357 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 03:20:38" (1/3) ... [2023-04-02 15:20:39,357 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c259762 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 03:20:39, skipping insertion in model container [2023-04-02 15:20:39,358 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:20:38" (2/3) ... [2023-04-02 15:20:39,358 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c259762 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 03:20:39, skipping insertion in model container [2023-04-02 15:20:39,358 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 03:20:39" (3/3) ... [2023-04-02 15:20:39,359 INFO L112 eAbstractionObserver]: Analyzing ICFG partial_lesser_bound.i [2023-04-02 15:20:39,374 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 15:20:39,374 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 15:20:39,412 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 15:20:39,417 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;@554e2b7f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 15:20:39,418 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 15:20:39,420 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 15:20:39,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-04-02 15:20:39,426 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:20:39,427 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:20:39,427 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:20:39,432 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:20:39,432 INFO L85 PathProgramCache]: Analyzing trace with hash 598207555, now seen corresponding path program 1 times [2023-04-02 15:20:39,439 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:20:39,440 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [774434905] [2023-04-02 15:20:39,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:20:39,440 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:20:39,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:20:39,657 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 15:20:39,657 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:20:39,658 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [774434905] [2023-04-02 15:20:39,658 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [774434905] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 15:20:39,658 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 15:20:39,659 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-02 15:20:39,660 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140360318] [2023-04-02 15:20:39,661 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 15:20:39,665 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 15:20:39,665 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:20:39,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 15:20:39,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 15:20:39,690 INFO L87 Difference]: Start difference. First operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:20:39,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:20:39,754 INFO L93 Difference]: Finished difference Result 43 states and 54 transitions. [2023-04-02 15:20:39,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 15:20:39,756 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2023-04-02 15:20:39,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:20:39,761 INFO L225 Difference]: With dead ends: 43 [2023-04-02 15:20:39,761 INFO L226 Difference]: Without dead ends: 27 [2023-04-02 15:20:39,763 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 15:20:39,766 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 10 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 15:20:39,767 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 23 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 15:20:39,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-04-02 15:20:39,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 18. [2023-04-02 15:20:39,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 15:20:39,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2023-04-02 15:20:39,795 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 12 [2023-04-02 15:20:39,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:20:39,795 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2023-04-02 15:20:39,795 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:20:39,795 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2023-04-02 15:20:39,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-04-02 15:20:39,796 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:20:39,796 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:20:39,796 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 15:20:39,797 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:20:39,797 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:20:39,798 INFO L85 PathProgramCache]: Analyzing trace with hash 1786130268, now seen corresponding path program 1 times [2023-04-02 15:20:39,798 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:20:39,798 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [233949153] [2023-04-02 15:20:39,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:20:39,798 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:20:39,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:20:39,972 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 15:20:39,973 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:20:39,973 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [233949153] [2023-04-02 15:20:39,973 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [233949153] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:20:39,973 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353440374] [2023-04-02 15:20:39,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:20:39,974 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:20:39,974 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:20:39,977 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 15:20:39,978 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 15:20:40,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:20:40,052 INFO L262 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-02 15:20:40,057 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:20:40,093 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 15:20:40,093 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:20:40,119 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 15:20:40,119 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353440374] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:20:40,120 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1585836198] [2023-04-02 15:20:40,137 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-02 15:20:40,138 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:20:40,141 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:20:40,145 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:20:40,145 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:20:40,338 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 33 for LOIs [2023-04-02 15:20:40,517 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 33 for LOIs [2023-04-02 15:20:40,538 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 22 for LOIs [2023-04-02 15:20:40,558 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:20:40,853 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '203#(and (<= 1 |#StackHeapBarrier|) (= ~i~0 0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= (select (select |#memory_$Pointer$.offset| 3) 0) 0) (= 3 |~#a~0.base|) (= |#NULL.offset| 0) (= |~#a~0.offset| 0) (= (select (select |#memory_$Pointer$.base| 3) 0) 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:20:40,853 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:20:40,853 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:20:40,853 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-02 15:20:40,854 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635185353] [2023-04-02 15:20:40,854 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:20:40,856 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-02 15:20:40,856 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:20:40,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-02 15:20:40,860 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=176, Unknown=0, NotChecked=0, Total=272 [2023-04-02 15:20:40,860 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:20:40,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:20:40,938 INFO L93 Difference]: Finished difference Result 52 states and 59 transitions. [2023-04-02 15:20:40,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 15:20:40,938 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2023-04-02 15:20:40,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:20:40,940 INFO L225 Difference]: With dead ends: 52 [2023-04-02 15:20:40,940 INFO L226 Difference]: Without dead ends: 41 [2023-04-02 15:20:40,941 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=96, Invalid=176, Unknown=0, NotChecked=0, Total=272 [2023-04-02 15:20:40,942 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 57 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 15:20:40,946 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [57 Valid, 22 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 15:20:40,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-04-02 15:20:40,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 22. [2023-04-02 15:20:40,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 15:20:40,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2023-04-02 15:20:40,957 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 14 [2023-04-02 15:20:40,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:20:40,958 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2023-04-02 15:20:40,959 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:20:40,959 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2023-04-02 15:20:40,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-02 15:20:40,960 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:20:40,960 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:20:40,969 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-02 15:20:41,166 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 15:20:41,166 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:20:41,167 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:20:41,167 INFO L85 PathProgramCache]: Analyzing trace with hash -435094557, now seen corresponding path program 2 times [2023-04-02 15:20:41,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:20:41,167 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1563420932] [2023-04-02 15:20:41,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:20:41,168 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:20:41,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:20:41,404 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-02 15:20:41,405 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:20:41,405 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1563420932] [2023-04-02 15:20:41,405 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1563420932] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:20:41,405 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1612130515] [2023-04-02 15:20:41,405 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:20:41,405 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:20:41,406 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:20:41,407 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 15:20:41,410 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 15:20:41,483 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-02 15:20:41,484 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:20:41,485 INFO L262 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-02 15:20:41,486 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:20:41,501 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 15:20:41,501 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:20:41,535 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 15:20:41,535 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1612130515] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:20:41,536 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1244523208] [2023-04-02 15:20:41,538 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-02 15:20:41,538 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:20:41,538 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:20:41,539 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:20:41,539 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:20:41,629 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 33 for LOIs [2023-04-02 15:20:41,716 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 33 for LOIs [2023-04-02 15:20:41,733 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 22 for LOIs [2023-04-02 15:20:41,748 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:20:42,033 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '445#(and (<= 1 |#StackHeapBarrier|) (= ~i~0 0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= (select (select |#memory_$Pointer$.offset| 3) 0) 0) (= 3 |~#a~0.base|) (= |#NULL.offset| 0) (= |~#a~0.offset| 0) (= (select (select |#memory_$Pointer$.base| 3) 0) 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:20:42,034 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:20:42,034 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:20:42,034 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 11 [2023-04-02 15:20:42,034 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367584723] [2023-04-02 15:20:42,034 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:20:42,035 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-02 15:20:42,035 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:20:42,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-02 15:20:42,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=258, Unknown=0, NotChecked=0, Total=420 [2023-04-02 15:20:42,036 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:20:42,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:20:42,154 INFO L93 Difference]: Finished difference Result 108 states and 121 transitions. [2023-04-02 15:20:42,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-02 15:20:42,154 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2023-04-02 15:20:42,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:20:42,155 INFO L225 Difference]: With dead ends: 108 [2023-04-02 15:20:42,155 INFO L226 Difference]: Without dead ends: 96 [2023-04-02 15:20:42,156 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=162, Invalid=258, Unknown=0, NotChecked=0, Total=420 [2023-04-02 15:20:42,157 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 144 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 144 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:20:42,157 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [144 Valid, 47 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:20:42,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2023-04-02 15:20:42,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 32. [2023-04-02 15:20:42,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 15:20:42,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2023-04-02 15:20:42,164 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 18 [2023-04-02 15:20:42,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:20:42,165 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2023-04-02 15:20:42,165 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:20:42,165 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2023-04-02 15:20:42,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-04-02 15:20:42,166 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:20:42,166 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:20:42,173 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-02 15:20:42,372 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 15:20:42,372 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:20:42,373 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:20:42,373 INFO L85 PathProgramCache]: Analyzing trace with hash -1675766589, now seen corresponding path program 3 times [2023-04-02 15:20:42,373 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:20:42,373 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1990220309] [2023-04-02 15:20:42,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:20:42,373 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:20:42,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:20:42,615 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-04-02 15:20:42,615 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:20:42,616 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1990220309] [2023-04-02 15:20:42,616 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1990220309] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:20:42,616 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1789923841] [2023-04-02 15:20:42,616 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:20:42,616 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:20:42,616 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:20:42,618 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 15:20:42,656 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 15:20:42,779 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:20:42,780 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:20:42,782 INFO L262 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-02 15:20:42,785 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:20:42,805 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-04-02 15:20:42,805 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:20:42,941 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-04-02 15:20:42,941 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1789923841] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:20:42,941 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [625481973] [2023-04-02 15:20:42,943 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-02 15:20:42,944 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:20:42,944 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:20:42,944 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:20:42,944 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:20:42,999 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 33 for LOIs [2023-04-02 15:20:43,067 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 33 for LOIs [2023-04-02 15:20:43,081 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 22 for LOIs [2023-04-02 15:20:43,091 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:20:43,333 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '859#(and (<= 1 |#StackHeapBarrier|) (= ~i~0 0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= (select (select |#memory_$Pointer$.offset| 3) 0) 0) (= 3 |~#a~0.base|) (= |#NULL.offset| 0) (= |~#a~0.offset| 0) (= (select (select |#memory_$Pointer$.base| 3) 0) 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:20:43,334 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:20:43,334 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:20:43,334 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2023-04-02 15:20:43,334 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725753706] [2023-04-02 15:20:43,334 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:20:43,334 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-04-02 15:20:43,335 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:20:43,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-04-02 15:20:43,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=533, Unknown=0, NotChecked=0, Total=930 [2023-04-02 15:20:43,336 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 21 states have internal predecessors, (29), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:20:43,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:20:43,477 INFO L93 Difference]: Finished difference Result 143 states and 157 transitions. [2023-04-02 15:20:43,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-04-02 15:20:43,478 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 21 states have internal predecessors, (29), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2023-04-02 15:20:43,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:20:43,479 INFO L225 Difference]: With dead ends: 143 [2023-04-02 15:20:43,479 INFO L226 Difference]: Without dead ends: 125 [2023-04-02 15:20:43,480 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 395 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=397, Invalid=533, Unknown=0, NotChecked=0, Total=930 [2023-04-02 15:20:43,480 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 166 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:20:43,481 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [166 Valid, 63 Invalid, 159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:20:43,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2023-04-02 15:20:43,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 43. [2023-04-02 15:20:43,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 37 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 15:20:43,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2023-04-02 15:20:43,489 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 28 [2023-04-02 15:20:43,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:20:43,489 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2023-04-02 15:20:43,490 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 21 states have internal predecessors, (29), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:20:43,490 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2023-04-02 15:20:43,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-04-02 15:20:43,490 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:20:43,490 INFO L195 NwaCegarLoop]: trace histogram [18, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:20:43,500 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 15:20:43,696 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 15:20:43,697 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:20:43,697 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:20:43,697 INFO L85 PathProgramCache]: Analyzing trace with hash -856020184, now seen corresponding path program 4 times [2023-04-02 15:20:43,697 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:20:43,697 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135302780] [2023-04-02 15:20:43,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:20:43,698 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:20:43,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:20:44,321 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-04-02 15:20:44,321 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:20:44,321 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135302780] [2023-04-02 15:20:44,321 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [135302780] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:20:44,321 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [880888108] [2023-04-02 15:20:44,321 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:20:44,322 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:20:44,322 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:20:44,323 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 15:20:44,325 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 15:20:44,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:20:44,495 INFO L262 TraceCheckSpWp]: Trace formula consists of 593 conjuncts, 20 conjunts are in the unsatisfiable core [2023-04-02 15:20:44,498 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:20:44,533 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-04-02 15:20:44,533 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:20:44,990 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-04-02 15:20:44,990 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [880888108] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:20:44,990 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1202717866] [2023-04-02 15:20:44,993 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-02 15:20:44,993 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:20:44,993 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:20:44,993 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:20:44,993 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:20:45,039 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 33 for LOIs [2023-04-02 15:20:45,102 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 33 for LOIs [2023-04-02 15:20:45,112 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 22 for LOIs [2023-04-02 15:20:45,122 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:20:45,405 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1439#(and (<= 1 |#StackHeapBarrier|) (= ~i~0 0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= (select (select |#memory_$Pointer$.offset| 3) 0) 0) (= 3 |~#a~0.base|) (= |#NULL.offset| 0) (= |~#a~0.offset| 0) (= (select (select |#memory_$Pointer$.base| 3) 0) 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:20:45,405 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:20:45,405 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:20:45,405 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 41 [2023-04-02 15:20:45,405 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189919673] [2023-04-02 15:20:45,405 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:20:45,406 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2023-04-02 15:20:45,406 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:20:45,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2023-04-02 15:20:45,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1167, Invalid=1383, Unknown=0, NotChecked=0, Total=2550 [2023-04-02 15:20:45,408 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 41 states, 41 states have (on average 1.1951219512195121) internal successors, (49), 41 states have internal predecessors, (49), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:20:45,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:20:45,881 INFO L93 Difference]: Finished difference Result 264 states and 297 transitions. [2023-04-02 15:20:45,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2023-04-02 15:20:45,882 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.1951219512195121) internal successors, (49), 41 states have internal predecessors, (49), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2023-04-02 15:20:45,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:20:45,886 INFO L225 Difference]: With dead ends: 264 [2023-04-02 15:20:45,886 INFO L226 Difference]: Without dead ends: 245 [2023-04-02 15:20:45,888 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 815 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1167, Invalid=1383, Unknown=0, NotChecked=0, Total=2550 [2023-04-02 15:20:45,889 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 717 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 442 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 717 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 583 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 442 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 15:20:45,891 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [717 Valid, 109 Invalid, 583 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [442 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 15:20:45,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2023-04-02 15:20:45,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 73. [2023-04-02 15:20:45,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 67 states have (on average 1.044776119402985) internal successors, (70), 67 states have internal predecessors, (70), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 15:20:45,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2023-04-02 15:20:45,915 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 39 [2023-04-02 15:20:45,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:20:45,915 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2023-04-02 15:20:45,915 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.1951219512195121) internal successors, (49), 41 states have internal predecessors, (49), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:20:45,915 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2023-04-02 15:20:45,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2023-04-02 15:20:45,916 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:20:45,917 INFO L195 NwaCegarLoop]: trace histogram [38, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:20:45,926 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 15:20:46,123 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 15:20:46,123 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:20:46,124 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:20:46,124 INFO L85 PathProgramCache]: Analyzing trace with hash -1235488504, now seen corresponding path program 5 times [2023-04-02 15:20:46,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:20:46,124 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [767741991] [2023-04-02 15:20:46,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:20:46,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:20:46,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:20:47,920 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2023-04-02 15:20:47,920 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:20:47,920 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [767741991] [2023-04-02 15:20:47,920 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [767741991] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:20:47,920 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1313678607] [2023-04-02 15:20:47,921 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:20:47,921 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:20:47,921 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:20:47,925 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 15:20:47,951 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process