/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/reducercommutativity/sep20-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 14:29:41,354 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 14:29:41,356 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 14:29:41,390 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 14:29:41,390 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 14:29:41,391 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 14:29:41,392 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 14:29:41,393 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 14:29:41,394 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 14:29:41,395 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 14:29:41,395 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 14:29:41,396 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 14:29:41,396 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 14:29:41,397 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 14:29:41,398 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 14:29:41,399 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 14:29:41,399 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 14:29:41,400 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 14:29:41,401 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 14:29:41,403 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 14:29:41,404 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 14:29:41,406 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 14:29:41,407 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 14:29:41,408 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 14:29:41,421 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-02 14:29:41,421 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-02 14:29:41,421 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-02 14:29:41,423 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-02 14:29:41,423 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-02 14:29:41,424 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-02 14:29:41,424 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 14:29:41,425 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 14:29:41,426 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 14:29:41,427 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 14:29:41,427 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 14:29:41,428 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 14:29:41,428 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 14:29:41,428 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 14:29:41,428 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 14:29:41,429 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 14:29:41,430 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 14:29:41,431 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 14:29:41,458 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 14:29:41,458 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 14:29:41,459 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 14:29:41,459 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 14:29:41,459 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 14:29:41,459 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 14:29:41,460 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 14:29:41,460 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 14:29:41,460 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 14:29:41,460 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 14:29:41,460 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 14:29:41,460 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 14:29:41,460 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 14:29:41,460 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 14:29:41,461 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 14:29:41,461 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 14:29:41,461 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 14:29:41,461 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 14:29:41,461 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 14:29:41,462 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 14:29:41,462 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 14:29:41,462 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 14:29:41,462 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 14:29:41,462 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 14:29:41,462 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 14:29:41,462 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 14:29:41,462 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 14:29:41,462 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 14:29:41,463 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 14:29:41,463 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 14:29:41,463 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 14:29:41,463 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 14:29:41,463 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 14:29:41,463 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 14:29:41,463 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 14:29:41,463 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 14:29:41,464 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 14:29:41,464 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 14:29:41,464 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 14:29:41,464 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 14:29:41,464 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 14:29:41,464 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 14:29:41,660 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 14:29:41,684 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 14:29:41,687 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 14:29:41,688 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 14:29:41,689 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 14:29:41,690 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/reducercommutativity/sep20-1.i [2023-04-02 14:29:42,910 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 14:29:43,074 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 14:29:43,075 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/reducercommutativity/sep20-1.i [2023-04-02 14:29:43,085 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/54f48bfc9/0bfee3af17ef4c4a823648b8b7582ab3/FLAG704e44296 [2023-04-02 14:29:43,096 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/54f48bfc9/0bfee3af17ef4c4a823648b8b7582ab3 [2023-04-02 14:29:43,098 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 14:29:43,099 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 14:29:43,101 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 14:29:43,101 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 14:29:43,107 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 14:29:43,108 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 02:29:43" (1/1) ... [2023-04-02 14:29:43,109 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d11e9ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:29:43, skipping insertion in model container [2023-04-02 14:29:43,109 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 02:29:43" (1/1) ... [2023-04-02 14:29:43,115 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 14:29:43,126 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 14:29:43,234 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/reducercommutativity/sep20-1.i[1293,1306] [2023-04-02 14:29:43,237 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 14:29:43,243 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 14:29:43,260 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/reducercommutativity/sep20-1.i[1293,1306] [2023-04-02 14:29:43,261 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 14:29:43,271 INFO L208 MainTranslator]: Completed translation [2023-04-02 14:29:43,272 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:29:43 WrapperNode [2023-04-02 14:29:43,272 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 14:29:43,273 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 14:29:43,273 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 14:29:43,273 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 14:29:43,281 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:29:43" (1/1) ... [2023-04-02 14:29:43,282 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:29:43" (1/1) ... [2023-04-02 14:29:43,287 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:29:43" (1/1) ... [2023-04-02 14:29:43,287 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:29:43" (1/1) ... [2023-04-02 14:29:43,294 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:29:43" (1/1) ... [2023-04-02 14:29:43,297 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:29:43" (1/1) ... [2023-04-02 14:29:43,298 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:29:43" (1/1) ... [2023-04-02 14:29:43,299 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:29:43" (1/1) ... [2023-04-02 14:29:43,301 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 14:29:43,301 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 14:29:43,302 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 14:29:43,302 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 14:29:43,302 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:29:43" (1/1) ... [2023-04-02 14:29:43,309 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 14:29:43,317 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:29:43,334 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 14:29:43,342 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 14:29:43,370 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 14:29:43,371 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 14:29:43,371 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 14:29:43,371 INFO L138 BoogieDeclarations]: Found implementation of procedure sep [2023-04-02 14:29:43,372 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 14:29:43,372 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 14:29:43,372 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 14:29:43,372 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-02 14:29:43,373 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-02 14:29:43,373 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 14:29:43,373 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 14:29:43,373 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 14:29:43,373 INFO L130 BoogieDeclarations]: Found specification of procedure sep [2023-04-02 14:29:43,373 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 14:29:43,373 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 14:29:43,373 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-02 14:29:43,374 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 14:29:43,374 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 14:29:43,374 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 14:29:43,374 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 14:29:43,374 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 14:29:43,459 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 14:29:43,461 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 14:29:43,653 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 14:29:43,713 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 14:29:43,713 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-04-02 14:29:43,715 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 02:29:43 BoogieIcfgContainer [2023-04-02 14:29:43,715 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 14:29:43,716 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 14:29:43,717 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 14:29:43,719 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 14:29:43,719 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 02:29:43" (1/3) ... [2023-04-02 14:29:43,720 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c58fb66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 02:29:43, skipping insertion in model container [2023-04-02 14:29:43,720 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:29:43" (2/3) ... [2023-04-02 14:29:43,720 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c58fb66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 02:29:43, skipping insertion in model container [2023-04-02 14:29:43,721 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 02:29:43" (3/3) ... [2023-04-02 14:29:43,722 INFO L112 eAbstractionObserver]: Analyzing ICFG sep20-1.i [2023-04-02 14:29:43,736 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 14:29:43,737 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 14:29:43,775 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 14:29:43,781 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;@47051180, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 14:29:43,781 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 14:29:43,784 INFO L276 IsEmpty]: Start isEmpty. Operand has 23 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-02 14:29:43,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-04-02 14:29:43,791 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:29:43,791 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:29:43,792 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:29:43,796 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:29:43,796 INFO L85 PathProgramCache]: Analyzing trace with hash -485966958, now seen corresponding path program 1 times [2023-04-02 14:29:43,804 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:29:43,805 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [914989078] [2023-04-02 14:29:43,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:29:43,805 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:29:43,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:29:44,082 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-02 14:29:44,083 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:29:44,084 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [914989078] [2023-04-02 14:29:44,085 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [914989078] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 14:29:44,085 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 14:29:44,086 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-02 14:29:44,087 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698302590] [2023-04-02 14:29:44,088 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 14:29:44,091 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 14:29:44,091 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:29:44,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 14:29:44,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 14:29:44,124 INFO L87 Difference]: Start difference. First operand has 23 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-04-02 14:29:44,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:29:44,187 INFO L93 Difference]: Finished difference Result 41 states and 51 transitions. [2023-04-02 14:29:44,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 14:29:44,190 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 24 [2023-04-02 14:29:44,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:29:44,195 INFO L225 Difference]: With dead ends: 41 [2023-04-02 14:29:44,196 INFO L226 Difference]: Without dead ends: 20 [2023-04-02 14:29:44,198 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 14:29:44,201 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 0 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:29:44,202 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 37 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:29:44,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-04-02 14:29:44,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-04-02 14:29:44,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 14:29:44,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2023-04-02 14:29:44,231 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 24 [2023-04-02 14:29:44,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:29:44,232 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2023-04-02 14:29:44,232 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-04-02 14:29:44,232 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2023-04-02 14:29:44,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-04-02 14:29:44,233 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:29:44,234 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:29:44,234 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 14:29:44,234 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:29:44,235 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:29:44,235 INFO L85 PathProgramCache]: Analyzing trace with hash 1157472597, now seen corresponding path program 1 times [2023-04-02 14:29:44,235 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:29:44,235 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993838478] [2023-04-02 14:29:44,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:29:44,236 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:29:44,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:29:44,347 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-02 14:29:44,347 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:29:44,347 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993838478] [2023-04-02 14:29:44,347 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [993838478] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:29:44,348 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [623967994] [2023-04-02 14:29:44,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:29:44,348 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:29:44,348 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:29:44,351 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 14:29:44,355 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 14:29:44,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:29:44,450 INFO L262 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 2 conjunts are in the unsatisfiable core [2023-04-02 14:29:44,454 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:29:44,480 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 14:29:44,480 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 14:29:44,481 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [623967994] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 14:29:44,481 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-02 14:29:44,481 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2023-04-02 14:29:44,482 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704102988] [2023-04-02 14:29:44,482 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 14:29:44,483 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 14:29:44,483 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:29:44,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 14:29:44,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-04-02 14:29:44,484 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-04-02 14:29:44,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:29:44,501 INFO L93 Difference]: Finished difference Result 33 states and 43 transitions. [2023-04-02 14:29:44,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 14:29:44,501 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 25 [2023-04-02 14:29:44,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:29:44,502 INFO L225 Difference]: With dead ends: 33 [2023-04-02 14:29:44,502 INFO L226 Difference]: Without dead ends: 21 [2023-04-02 14:29:44,503 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-04-02 14:29:44,504 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:29:44,506 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 31 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:29:44,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-04-02 14:29:44,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-04-02 14:29:44,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 14:29:44,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2023-04-02 14:29:44,520 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 25 [2023-04-02 14:29:44,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:29:44,520 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2023-04-02 14:29:44,520 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-04-02 14:29:44,521 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2023-04-02 14:29:44,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-04-02 14:29:44,522 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:29:44,523 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:29:44,530 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 14:29:44,728 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 14:29:44,729 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:29:44,729 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:29:44,729 INFO L85 PathProgramCache]: Analyzing trace with hash -1682533220, now seen corresponding path program 1 times [2023-04-02 14:29:44,730 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:29:44,730 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1335416887] [2023-04-02 14:29:44,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:29:44,730 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:29:44,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:29:44,871 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-02 14:29:44,872 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:29:44,872 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1335416887] [2023-04-02 14:29:44,873 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1335416887] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:29:44,876 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [230631072] [2023-04-02 14:29:44,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:29:44,876 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:29:44,876 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:29:44,878 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 14:29:44,903 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 14:29:44,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:29:44,980 INFO L262 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 2 conjunts are in the unsatisfiable core [2023-04-02 14:29:44,983 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:29:45,003 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 14:29:45,004 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 14:29:45,004 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [230631072] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 14:29:45,004 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-02 14:29:45,004 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2023-04-02 14:29:45,005 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555449569] [2023-04-02 14:29:45,005 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 14:29:45,005 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 14:29:45,005 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:29:45,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 14:29:45,010 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-04-02 14:29:45,010 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-04-02 14:29:45,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:29:45,040 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2023-04-02 14:29:45,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 14:29:45,041 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 28 [2023-04-02 14:29:45,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:29:45,043 INFO L225 Difference]: With dead ends: 31 [2023-04-02 14:29:45,044 INFO L226 Difference]: Without dead ends: 22 [2023-04-02 14:29:45,044 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-04-02 14:29:45,047 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:29:45,048 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 31 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:29:45,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-04-02 14:29:45,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-04-02 14:29:45,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 14:29:45,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2023-04-02 14:29:45,053 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 28 [2023-04-02 14:29:45,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:29:45,054 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2023-04-02 14:29:45,055 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-04-02 14:29:45,055 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2023-04-02 14:29:45,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-04-02 14:29:45,056 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:29:45,057 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:29:45,069 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 14:29:45,269 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 14:29:45,270 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:29:45,270 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:29:45,270 INFO L85 PathProgramCache]: Analyzing trace with hash 800179286, now seen corresponding path program 1 times [2023-04-02 14:29:45,270 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:29:45,271 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [888229935] [2023-04-02 14:29:45,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:29:45,272 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:29:45,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:29:45,410 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-04-02 14:29:45,410 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:29:45,410 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [888229935] [2023-04-02 14:29:45,411 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [888229935] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:29:45,411 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1351532399] [2023-04-02 14:29:45,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:29:45,411 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:29:45,411 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:29:45,420 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 14:29:45,425 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 14:29:45,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:29:45,505 INFO L262 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-02 14:29:45,510 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:29:45,540 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-04-02 14:29:45,540 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:29:45,595 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-04-02 14:29:45,595 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1351532399] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:29:45,595 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [722851414] [2023-04-02 14:29:45,610 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-02 14:29:45,610 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:29:45,613 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:29:45,617 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:29:45,618 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:29:45,713 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:29:46,492 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 19 for LOIs [2023-04-02 14:29:46,617 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:29:46,622 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:29:47,694 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '631#(and (<= 20 main_~i~1) (<= 1 |#StackHeapBarrier|) (<= 0 (+ main_~ret2~0 2147483648)) (<= main_~ret~1 2147483647) (<= main_~ret5~0 2147483647) (or (not (= main_~ret~1 main_~ret5~0)) (not (= main_~ret~1 main_~ret2~0))) (<= 19 main_~i~2) (<= 0 (+ main_~ret5~0 2147483648)) (<= 0 (+ main_~ret~1 2147483648)) (<= main_~ret2~0 2147483647) (= |main_~#x~0.offset| 0) (= |#NULL.offset| 0) (<= (+ |#StackHeapBarrier| 1) |main_~#x~0.base|) (= |#NULL.base| 0))' at error location [2023-04-02 14:29:47,695 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:29:47,695 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:29:47,695 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-02 14:29:47,695 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179072769] [2023-04-02 14:29:47,695 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:29:47,696 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-02 14:29:47,696 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:29:47,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-02 14:29:47,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=362, Unknown=8, NotChecked=0, Total=462 [2023-04-02 14:29:47,698 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-04-02 14:29:47,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:29:47,737 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2023-04-02 14:29:47,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 14:29:47,742 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 29 [2023-04-02 14:29:47,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:29:47,743 INFO L225 Difference]: With dead ends: 40 [2023-04-02 14:29:47,743 INFO L226 Difference]: Without dead ends: 25 [2023-04-02 14:29:47,744 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=92, Invalid=362, Unknown=8, NotChecked=0, Total=462 [2023-04-02 14:29:47,745 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:29:47,746 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 61 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:29:47,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-04-02 14:29:47,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2023-04-02 14:29:47,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 14:29:47,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2023-04-02 14:29:47,750 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 29 [2023-04-02 14:29:47,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:29:47,750 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2023-04-02 14:29:47,750 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-04-02 14:29:47,751 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2023-04-02 14:29:47,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-04-02 14:29:47,752 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:29:47,752 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:29:47,760 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 14:29:47,957 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 14:29:47,958 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:29:47,958 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:29:47,958 INFO L85 PathProgramCache]: Analyzing trace with hash 592310483, now seen corresponding path program 2 times [2023-04-02 14:29:47,958 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:29:47,958 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1311211131] [2023-04-02 14:29:47,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:29:47,959 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:29:47,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:29:48,058 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-02 14:29:48,059 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:29:48,059 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1311211131] [2023-04-02 14:29:48,059 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1311211131] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:29:48,059 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1219488500] [2023-04-02 14:29:48,059 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:29:48,059 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:29:48,059 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:29:48,061 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 14:29:48,085 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 14:29:48,131 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-02 14:29:48,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:29:48,132 INFO L262 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-02 14:29:48,135 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:29:48,148 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-02 14:29:48,148 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:29:48,172 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-02 14:29:48,172 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1219488500] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:29:48,172 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1054939594] [2023-04-02 14:29:48,177 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-02 14:29:48,177 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:29:48,178 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:29:48,178 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:29:48,178 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:29:48,198 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:29:48,610 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 19 for LOIs [2023-04-02 14:29:48,707 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:29:48,710 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:29:49,660 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '949#(and (<= 20 main_~i~1) (<= 1 |#StackHeapBarrier|) (<= 0 (+ main_~ret2~0 2147483648)) (<= main_~ret~1 2147483647) (<= main_~ret5~0 2147483647) (or (not (= main_~ret~1 main_~ret5~0)) (not (= main_~ret~1 main_~ret2~0))) (<= 19 main_~i~2) (<= 0 (+ main_~ret5~0 2147483648)) (<= 0 (+ main_~ret~1 2147483648)) (<= main_~ret2~0 2147483647) (= |main_~#x~0.offset| 0) (= |#NULL.offset| 0) (<= (+ |#StackHeapBarrier| 1) |main_~#x~0.base|) (= |#NULL.base| 0))' at error location [2023-04-02 14:29:49,660 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:29:49,660 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:29:49,660 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-02 14:29:49,661 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793190440] [2023-04-02 14:29:49,661 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:29:49,661 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-02 14:29:49,661 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:29:49,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-02 14:29:49,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=362, Unknown=8, NotChecked=0, Total=462 [2023-04-02 14:29:49,662 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 7 states have internal predecessors, (26), 2 states have call successors, (7), 1 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-04-02 14:29:49,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:29:49,687 INFO L93 Difference]: Finished difference Result 42 states and 54 transitions. [2023-04-02 14:29:49,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 14:29:49,688 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 7 states have internal predecessors, (26), 2 states have call successors, (7), 1 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 32 [2023-04-02 14:29:49,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:29:49,688 INFO L225 Difference]: With dead ends: 42 [2023-04-02 14:29:49,688 INFO L226 Difference]: Without dead ends: 28 [2023-04-02 14:29:49,689 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=92, Invalid=362, Unknown=8, NotChecked=0, Total=462 [2023-04-02 14:29:49,690 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:29:49,690 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 46 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:29:49,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-04-02 14:29:49,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2023-04-02 14:29:49,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 14:29:49,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2023-04-02 14:29:49,694 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 32 [2023-04-02 14:29:49,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:29:49,694 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2023-04-02 14:29:49,695 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 7 states have internal predecessors, (26), 2 states have call successors, (7), 1 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-04-02 14:29:49,695 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2023-04-02 14:29:49,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-04-02 14:29:49,695 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:29:49,696 INFO L195 NwaCegarLoop]: trace histogram [12, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:29:49,704 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 14:29:49,896 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 14:29:49,896 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:29:49,897 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:29:49,897 INFO L85 PathProgramCache]: Analyzing trace with hash 1607993378, now seen corresponding path program 3 times [2023-04-02 14:29:49,897 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:29:49,897 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [353527059] [2023-04-02 14:29:49,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:29:49,897 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:29:49,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:29:50,004 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2023-04-02 14:29:50,004 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:29:50,004 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [353527059] [2023-04-02 14:29:50,004 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [353527059] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:29:50,005 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [768166010] [2023-04-02 14:29:50,005 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:29:50,005 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:29:50,005 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:29:50,006 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 14:29:50,017 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 14:29:50,103 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:29:50,103 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:29:50,105 INFO L262 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-02 14:29:50,108 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:29:50,139 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-04-02 14:29:50,140 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:29:50,194 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-04-02 14:29:50,194 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [768166010] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:29:50,194 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [537431442] [2023-04-02 14:29:50,198 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-02 14:29:50,198 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:29:50,198 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:29:50,198 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:29:50,199 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:29:50,215 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:29:50,598 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 19 for LOIs [2023-04-02 14:29:50,685 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:29:50,688 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:29:51,671 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1338#(and (<= 20 main_~i~1) (<= 1 |#StackHeapBarrier|) (<= 0 (+ main_~ret2~0 2147483648)) (<= main_~ret~1 2147483647) (<= main_~ret5~0 2147483647) (or (not (= main_~ret~1 main_~ret5~0)) (not (= main_~ret~1 main_~ret2~0))) (<= 19 main_~i~2) (<= 0 (+ main_~ret5~0 2147483648)) (<= 0 (+ main_~ret~1 2147483648)) (<= main_~ret2~0 2147483647) (= |main_~#x~0.offset| 0) (= |#NULL.offset| 0) (<= (+ |#StackHeapBarrier| 1) |main_~#x~0.base|) (= |#NULL.base| 0))' at error location [2023-04-02 14:29:51,671 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:29:51,671 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:29:51,671 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 7, 7] total 14 [2023-04-02 14:29:51,671 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899052488] [2023-04-02 14:29:51,671 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:29:51,672 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-02 14:29:51,672 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:29:51,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-02 14:29:51,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=662, Unknown=8, NotChecked=0, Total=812 [2023-04-02 14:29:51,673 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 2 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2023-04-02 14:29:51,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:29:51,712 INFO L93 Difference]: Finished difference Result 53 states and 67 transitions. [2023-04-02 14:29:51,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-02 14:29:51,712 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 2 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) Word has length 41 [2023-04-02 14:29:51,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:29:51,713 INFO L225 Difference]: With dead ends: 53 [2023-04-02 14:29:51,713 INFO L226 Difference]: Without dead ends: 35 [2023-04-02 14:29:51,714 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 98 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 260 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=142, Invalid=662, Unknown=8, NotChecked=0, Total=812 [2023-04-02 14:29:51,715 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:29:51,715 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 76 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:29:51,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-04-02 14:29:51,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2023-04-02 14:29:51,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 27 states have internal predecessors, (30), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 14:29:51,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2023-04-02 14:29:51,719 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 41 [2023-04-02 14:29:51,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:29:51,719 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2023-04-02 14:29:51,719 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 2 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2023-04-02 14:29:51,720 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2023-04-02 14:29:51,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-04-02 14:29:51,720 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:29:51,720 INFO L195 NwaCegarLoop]: trace histogram [12, 10, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:29:51,729 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 14:29:51,926 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 14:29:51,927 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:29:51,927 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:29:51,927 INFO L85 PathProgramCache]: Analyzing trace with hash 731420978, now seen corresponding path program 4 times [2023-04-02 14:29:51,928 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:29:51,928 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [26445249] [2023-04-02 14:29:51,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:29:51,928 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:29:51,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:29:52,200 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2023-04-02 14:29:52,200 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:29:52,200 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [26445249] [2023-04-02 14:29:52,200 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [26445249] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:29:52,200 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1135383287] [2023-04-02 14:29:52,200 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:29:52,203 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:29:52,203 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:29:52,205 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 14:29:52,227 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 14:29:52,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:29:52,324 INFO L262 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-02 14:29:52,326 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:29:52,356 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2023-04-02 14:29:52,357 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:29:52,514 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2023-04-02 14:29:52,515 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1135383287] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:29:52,515 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [237489099] [2023-04-02 14:29:52,517 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-02 14:29:52,517 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:29:52,517 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:29:52,517 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:29:52,517 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:29:52,534 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:29:52,898 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 19 for LOIs [2023-04-02 14:29:52,986 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:29:52,990 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:29:53,858 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1814#(and (<= 20 main_~i~1) (<= 1 |#StackHeapBarrier|) (<= 0 (+ main_~ret2~0 2147483648)) (<= main_~ret~1 2147483647) (<= main_~ret5~0 2147483647) (or (not (= main_~ret~1 main_~ret5~0)) (not (= main_~ret~1 main_~ret2~0))) (<= 19 main_~i~2) (<= 0 (+ main_~ret5~0 2147483648)) (<= 0 (+ main_~ret~1 2147483648)) (<= main_~ret2~0 2147483647) (= |main_~#x~0.offset| 0) (= |#NULL.offset| 0) (<= (+ |#StackHeapBarrier| 1) |main_~#x~0.base|) (= |#NULL.base| 0))' at error location [2023-04-02 14:29:53,859 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:29:53,859 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:29:53,859 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 23 [2023-04-02 14:29:53,859 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118270420] [2023-04-02 14:29:53,859 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:29:53,860 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-04-02 14:29:53,861 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:29:53,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-04-02 14:29:53,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=1074, Unknown=8, NotChecked=0, Total=1406 [2023-04-02 14:29:53,862 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 23 states have internal predecessors, (39), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-04-02 14:29:53,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:29:53,922 INFO L93 Difference]: Finished difference Result 64 states and 81 transitions. [2023-04-02 14:29:53,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-04-02 14:29:53,923 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 23 states have internal predecessors, (39), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 48 [2023-04-02 14:29:53,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:29:53,923 INFO L225 Difference]: With dead ends: 64 [2023-04-02 14:29:53,923 INFO L226 Difference]: Without dead ends: 45 [2023-04-02 14:29:53,924 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 117 SyntacticMatches, 3 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 549 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=324, Invalid=1074, Unknown=8, NotChecked=0, Total=1406 [2023-04-02 14:29:53,925 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:29:53,925 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 121 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:29:53,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2023-04-02 14:29:53,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2023-04-02 14:29:53,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 37 states have internal predecessors, (40), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 14:29:53,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2023-04-02 14:29:53,930 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 48 [2023-04-02 14:29:53,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:29:53,930 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2023-04-02 14:29:53,930 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 23 states have internal predecessors, (39), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-04-02 14:29:53,930 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2023-04-02 14:29:53,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2023-04-02 14:29:53,931 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:29:53,931 INFO L195 NwaCegarLoop]: trace histogram [20, 12, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:29:53,945 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 14:29:54,141 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 14:29:54,141 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:29:54,142 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:29:54,142 INFO L85 PathProgramCache]: Analyzing trace with hash -1208048878, now seen corresponding path program 5 times [2023-04-02 14:29:54,142 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:29:54,142 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [738455599] [2023-04-02 14:29:54,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:29:54,142 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:29:54,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:29:54,342 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 62 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2023-04-02 14:29:54,342 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:29:54,342 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [738455599] [2023-04-02 14:29:54,342 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [738455599] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:29:54,342 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [637480205] [2023-04-02 14:29:54,343 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:29:54,343 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:29:54,343 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:29:54,344 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 14:29:54,346 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 14:29:54,441 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-02 14:29:54,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:29:54,444 INFO L262 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-02 14:29:54,448 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:29:54,461 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 52 proven. 10 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2023-04-02 14:29:54,461 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:29:54,515 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 52 proven. 10 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2023-04-02 14:29:54,515 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [637480205] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:29:54,515 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [471695111] [2023-04-02 14:29:54,519 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-02 14:29:54,519 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:29:54,519 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:29:54,519 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:29:54,520 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:29:54,561 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:29:54,893 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 19 for LOIs [2023-04-02 14:29:54,979 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:29:54,981 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:29:55,798 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2382#(and (<= 20 main_~i~1) (<= 1 |#StackHeapBarrier|) (<= 0 (+ main_~ret2~0 2147483648)) (<= main_~ret~1 2147483647) (<= main_~ret5~0 2147483647) (or (not (= main_~ret~1 main_~ret5~0)) (not (= main_~ret~1 main_~ret2~0))) (<= 19 main_~i~2) (<= 0 (+ main_~ret5~0 2147483648)) (<= 0 (+ main_~ret~1 2147483648)) (<= main_~ret2~0 2147483647) (= |main_~#x~0.offset| 0) (= |#NULL.offset| 0) (<= (+ |#StackHeapBarrier| 1) |main_~#x~0.base|) (= |#NULL.base| 0))' at error location [2023-04-02 14:29:55,798 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:29:55,798 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:29:55,798 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2023-04-02 14:29:55,798 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835110586] [2023-04-02 14:29:55,799 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:29:55,799 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-04-02 14:29:55,799 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:29:55,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-04-02 14:29:55,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=599, Unknown=8, NotChecked=0, Total=756 [2023-04-02 14:29:55,800 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 13 states have internal predecessors, (32), 2 states have call successors, (7), 1 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-04-02 14:29:55,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:29:55,840 INFO L93 Difference]: Finished difference Result 69 states and 84 transitions. [2023-04-02 14:29:55,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-02 14:29:55,840 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 13 states have internal predecessors, (32), 2 states have call successors, (7), 1 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 58 [2023-04-02 14:29:55,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:29:55,841 INFO L225 Difference]: With dead ends: 69 [2023-04-02 14:29:55,841 INFO L226 Difference]: Without dead ends: 51 [2023-04-02 14:29:55,841 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 153 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 282 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=149, Invalid=599, Unknown=8, NotChecked=0, Total=756 [2023-04-02 14:29:55,842 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:29:55,842 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 61 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:29:55,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2023-04-02 14:29:55,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2023-04-02 14:29:55,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 43 states have (on average 1.069767441860465) internal successors, (46), 43 states have internal predecessors, (46), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 14:29:55,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 55 transitions. [2023-04-02 14:29:55,847 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 55 transitions. Word has length 58 [2023-04-02 14:29:55,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:29:55,847 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 55 transitions. [2023-04-02 14:29:55,847 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 13 states have internal predecessors, (32), 2 states have call successors, (7), 1 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-04-02 14:29:55,847 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 55 transitions. [2023-04-02 14:29:55,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2023-04-02 14:29:55,848 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:29:55,848 INFO L195 NwaCegarLoop]: trace histogram [30, 20, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:29:55,863 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 14:29:56,054 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 14:29:56,055 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:29:56,055 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:29:56,055 INFO L85 PathProgramCache]: Analyzing trace with hash -1968114254, now seen corresponding path program 6 times [2023-04-02 14:29:56,055 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:29:56,055 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472921066] [2023-04-02 14:29:56,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:29:56,056 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:29:56,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:29:56,505 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 0 proven. 299 refuted. 0 times theorem prover too weak. 448 trivial. 0 not checked. [2023-04-02 14:29:56,506 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:29:56,506 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472921066] [2023-04-02 14:29:56,506 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [472921066] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:29:56,506 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1784608347] [2023-04-02 14:29:56,506 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:29:56,506 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:29:56,506 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:29:56,507 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 14:29:56,510 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 14:29:56,647 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:29:56,647 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:29:56,650 INFO L262 TraceCheckSpWp]: Trace formula consists of 455 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-02 14:29:56,652 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:29:56,672 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 244 proven. 55 refuted. 0 times theorem prover too weak. 448 trivial. 0 not checked. [2023-04-02 14:29:56,672 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:29:56,844 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 0 proven. 299 refuted. 0 times theorem prover too weak. 448 trivial. 0 not checked. [2023-04-02 14:29:56,845 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1784608347] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:29:56,845 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [996141082] [2023-04-02 14:29:56,847 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-02 14:29:56,847 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:29:56,847 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:29:56,847 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:29:56,847 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:29:56,859 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:29:57,166 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 19 for LOIs [2023-04-02 14:29:57,245 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:29:57,248 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:29:58,119 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3090#(and (<= 20 main_~i~1) (<= 1 |#StackHeapBarrier|) (<= 0 (+ main_~ret2~0 2147483648)) (<= main_~ret~1 2147483647) (<= main_~ret5~0 2147483647) (or (not (= main_~ret~1 main_~ret5~0)) (not (= main_~ret~1 main_~ret2~0))) (<= 19 main_~i~2) (<= 0 (+ main_~ret5~0 2147483648)) (<= 0 (+ main_~ret~1 2147483648)) (<= main_~ret2~0 2147483647) (= |main_~#x~0.offset| 0) (= |#NULL.offset| 0) (<= (+ |#StackHeapBarrier| 1) |main_~#x~0.base|) (= |#NULL.base| 0))' at error location [2023-04-02 14:29:58,120 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:29:58,120 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:29:58,120 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 23 [2023-04-02 14:29:58,120 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424311341] [2023-04-02 14:29:58,120 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:29:58,121 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-04-02 14:29:58,121 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:29:58,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-04-02 14:29:58,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=1074, Unknown=8, NotChecked=0, Total=1406 [2023-04-02 14:29:58,122 INFO L87 Difference]: Start difference. First operand 51 states and 55 transitions. Second operand has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-04-02 14:29:58,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:29:58,178 INFO L93 Difference]: Finished difference Result 85 states and 104 transitions. [2023-04-02 14:29:58,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-04-02 14:29:58,178 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 76 [2023-04-02 14:29:58,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:29:58,179 INFO L225 Difference]: With dead ends: 85 [2023-04-02 14:29:58,179 INFO L226 Difference]: Without dead ends: 61 [2023-04-02 14:29:58,180 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 201 SyntacticMatches, 3 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 549 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=324, Invalid=1074, Unknown=8, NotChecked=0, Total=1406 [2023-04-02 14:29:58,180 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:29:58,181 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 121 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:29:58,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-04-02 14:29:58,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2023-04-02 14:29:58,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 53 states have (on average 1.0566037735849056) internal successors, (56), 53 states have internal predecessors, (56), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 14:29:58,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 65 transitions. [2023-04-02 14:29:58,186 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 65 transitions. Word has length 76 [2023-04-02 14:29:58,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:29:58,186 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 65 transitions. [2023-04-02 14:29:58,186 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-04-02 14:29:58,186 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 65 transitions. [2023-04-02 14:29:58,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2023-04-02 14:29:58,187 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:29:58,187 INFO L195 NwaCegarLoop]: trace histogram [60, 20, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:29:58,199 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 14:29:58,393 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 14:29:58,394 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:29:58,394 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:29:58,394 INFO L85 PathProgramCache]: Analyzing trace with hash -1056437742, now seen corresponding path program 7 times [2023-04-02 14:29:58,394 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:29:58,395 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [874635236] [2023-04-02 14:29:58,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:29:58,395 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:29:58,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:29:58,737 INFO L134 CoverageAnalysis]: Checked inductivity of 2172 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2169 trivial. 0 not checked. [2023-04-02 14:29:58,738 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:29:58,738 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [874635236] [2023-04-02 14:29:58,738 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [874635236] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:29:58,738 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [268673048] [2023-04-02 14:29:58,738 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:29:58,738 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:29:58,738 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:29:58,739 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 14:29:58,742 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 14:29:58,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:29:58,907 INFO L262 TraceCheckSpWp]: Trace formula consists of 575 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-02 14:29:58,910 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:29:58,920 INFO L134 CoverageAnalysis]: Checked inductivity of 2172 backedges. 886 proven. 3 refuted. 0 times theorem prover too weak. 1283 trivial. 0 not checked. [2023-04-02 14:29:58,920 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:29:58,947 INFO L134 CoverageAnalysis]: Checked inductivity of 2172 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2169 trivial. 0 not checked. [2023-04-02 14:29:58,948 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [268673048] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:29:58,948 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1636058371] [2023-04-02 14:29:58,949 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-02 14:29:58,949 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:29:58,950 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:29:58,950 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:29:58,950 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:29:58,998 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:29:59,315 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 19 for LOIs [2023-04-02 14:29:59,375 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:29:59,377 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:30:00,175 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4016#(and (<= 20 main_~i~1) (<= 1 |#StackHeapBarrier|) (<= 0 (+ main_~ret2~0 2147483648)) (<= main_~ret~1 2147483647) (<= main_~ret5~0 2147483647) (or (not (= main_~ret~1 main_~ret5~0)) (not (= main_~ret~1 main_~ret2~0))) (<= 19 main_~i~2) (<= 0 (+ main_~ret5~0 2147483648)) (<= 0 (+ main_~ret~1 2147483648)) (<= main_~ret2~0 2147483647) (= |main_~#x~0.offset| 0) (= |#NULL.offset| 0) (<= (+ |#StackHeapBarrier| 1) |main_~#x~0.base|) (= |#NULL.base| 0))' at error location [2023-04-02 14:30:00,175 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:30:00,175 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:30:00,175 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2023-04-02 14:30:00,175 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459950839] [2023-04-02 14:30:00,175 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:30:00,176 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-02 14:30:00,176 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:30:00,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-02 14:30:00,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=437, Unknown=8, NotChecked=0, Total=552 [2023-04-02 14:30:00,177 INFO L87 Difference]: Start difference. First operand 61 states and 65 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-04-02 14:30:00,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:30:00,208 INFO L93 Difference]: Finished difference Result 93 states and 101 transitions. [2023-04-02 14:30:00,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-02 14:30:00,208 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 106 [2023-04-02 14:30:00,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:30:00,209 INFO L225 Difference]: With dead ends: 93 [2023-04-02 14:30:00,209 INFO L226 Difference]: Without dead ends: 65 [2023-04-02 14:30:00,210 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 299 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 178 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=107, Invalid=437, Unknown=8, NotChecked=0, Total=552 [2023-04-02 14:30:00,210 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:30:00,210 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 61 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:30:00,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-04-02 14:30:00,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2023-04-02 14:30:00,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 57 states have (on average 1.0526315789473684) internal successors, (60), 57 states have internal predecessors, (60), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 14:30:00,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 69 transitions. [2023-04-02 14:30:00,215 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 69 transitions. Word has length 106 [2023-04-02 14:30:00,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:30:00,216 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 69 transitions. [2023-04-02 14:30:00,216 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-04-02 14:30:00,216 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 69 transitions. [2023-04-02 14:30:00,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2023-04-02 14:30:00,217 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:30:00,217 INFO L195 NwaCegarLoop]: trace histogram [60, 20, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:30:00,227 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 14:30:00,424 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 14:30:00,425 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:30:00,425 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:30:00,425 INFO L85 PathProgramCache]: Analyzing trace with hash 1184599570, now seen corresponding path program 8 times [2023-04-02 14:30:00,425 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:30:00,425 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [202917035] [2023-04-02 14:30:00,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:30:00,426 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:30:00,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:30:00,840 INFO L134 CoverageAnalysis]: Checked inductivity of 2190 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 2169 trivial. 0 not checked. [2023-04-02 14:30:00,840 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:30:00,840 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [202917035] [2023-04-02 14:30:00,840 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [202917035] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:30:00,841 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [197134957] [2023-04-02 14:30:00,841 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:30:00,841 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:30:00,841 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:30:00,845 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 14:30:00,870 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 14:30:01,166 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-04-02 14:30:01,166 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:30:01,168 INFO L262 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-02 14:30:01,170 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:30:01,184 INFO L134 CoverageAnalysis]: Checked inductivity of 2190 backedges. 886 proven. 21 refuted. 0 times theorem prover too weak. 1283 trivial. 0 not checked. [2023-04-02 14:30:01,184 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:30:01,262 INFO L134 CoverageAnalysis]: Checked inductivity of 2190 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 2169 trivial. 0 not checked. [2023-04-02 14:30:01,263 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [197134957] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:30:01,263 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [211048882] [2023-04-02 14:30:01,264 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-02 14:30:01,264 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:30:01,264 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:30:01,265 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:30:01,265 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:30:01,275 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:30:01,614 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 19 for LOIs [2023-04-02 14:30:01,678 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:30:01,680 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:30:02,437 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5000#(and (<= 20 main_~i~1) (<= 1 |#StackHeapBarrier|) (<= 0 (+ main_~ret2~0 2147483648)) (<= main_~ret~1 2147483647) (<= main_~ret5~0 2147483647) (or (not (= main_~ret~1 main_~ret5~0)) (not (= main_~ret~1 main_~ret2~0))) (<= 19 main_~i~2) (<= 0 (+ main_~ret5~0 2147483648)) (<= 0 (+ main_~ret~1 2147483648)) (<= main_~ret2~0 2147483647) (= |main_~#x~0.offset| 0) (= |#NULL.offset| 0) (<= (+ |#StackHeapBarrier| 1) |main_~#x~0.base|) (= |#NULL.base| 0))' at error location [2023-04-02 14:30:02,438 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:30:02,438 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:30:02,438 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2023-04-02 14:30:02,438 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673412081] [2023-04-02 14:30:02,438 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:30:02,438 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-02 14:30:02,438 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:30:02,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-02 14:30:02,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=777, Unknown=8, NotChecked=0, Total=992 [2023-04-02 14:30:02,439 INFO L87 Difference]: Start difference. First operand 65 states and 69 transitions. Second operand has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-04-02 14:30:02,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:30:02,480 INFO L93 Difference]: Finished difference Result 101 states and 113 transitions. [2023-04-02 14:30:02,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-04-02 14:30:02,480 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 110 [2023-04-02 14:30:02,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:30:02,481 INFO L225 Difference]: With dead ends: 101 [2023-04-02 14:30:02,481 INFO L226 Difference]: Without dead ends: 73 [2023-04-02 14:30:02,482 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 307 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 386 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=207, Invalid=777, Unknown=8, NotChecked=0, Total=992 [2023-04-02 14:30:02,482 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:30:02,483 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 46 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:30:02,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2023-04-02 14:30:02,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2023-04-02 14:30:02,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 65 states have (on average 1.0461538461538462) internal successors, (68), 65 states have internal predecessors, (68), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 14:30:02,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 77 transitions. [2023-04-02 14:30:02,488 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 77 transitions. Word has length 110 [2023-04-02 14:30:02,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:30:02,488 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 77 transitions. [2023-04-02 14:30:02,488 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-04-02 14:30:02,488 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 77 transitions. [2023-04-02 14:30:02,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2023-04-02 14:30:02,489 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:30:02,489 INFO L195 NwaCegarLoop]: trace histogram [60, 20, 14, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:30:02,499 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 14:30:02,690 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 14:30:02,690 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:30:02,690 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:30:02,690 INFO L85 PathProgramCache]: Analyzing trace with hash -1701013998, now seen corresponding path program 9 times [2023-04-02 14:30:02,690 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:30:02,690 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1444309476] [2023-04-02 14:30:02,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:30:02,691 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:30:02,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:30:03,396 INFO L134 CoverageAnalysis]: Checked inductivity of 2274 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 2169 trivial. 0 not checked. [2023-04-02 14:30:03,396 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:30:03,396 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1444309476] [2023-04-02 14:30:03,396 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1444309476] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:30:03,396 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [110463747] [2023-04-02 14:30:03,396 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:30:03,396 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:30:03,397 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:30:03,401 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 14:30:03,427 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 14:30:03,609 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:30:03,609 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:30:03,614 INFO L262 TraceCheckSpWp]: Trace formula consists of 659 conjuncts, 16 conjunts are in the unsatisfiable core [2023-04-02 14:30:03,616 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:30:03,641 INFO L134 CoverageAnalysis]: Checked inductivity of 2274 backedges. 886 proven. 105 refuted. 0 times theorem prover too weak. 1283 trivial. 0 not checked. [2023-04-02 14:30:03,641 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:30:03,794 INFO L134 CoverageAnalysis]: Checked inductivity of 2274 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 2169 trivial. 0 not checked. [2023-04-02 14:30:03,795 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [110463747] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:30:03,795 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1562457334] [2023-04-02 14:30:03,796 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-02 14:30:03,796 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:30:03,797 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:30:03,797 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:30:03,797 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:30:03,808 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:30:04,163 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 19 for LOIs [2023-04-02 14:30:04,217 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:30:04,218 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:30:05,099 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6069#(and (<= 20 main_~i~1) (<= 1 |#StackHeapBarrier|) (<= 0 (+ main_~ret2~0 2147483648)) (<= main_~ret~1 2147483647) (<= main_~ret5~0 2147483647) (or (not (= main_~ret~1 main_~ret5~0)) (not (= main_~ret~1 main_~ret2~0))) (<= 19 main_~i~2) (<= 0 (+ main_~ret5~0 2147483648)) (<= 0 (+ main_~ret~1 2147483648)) (<= main_~ret2~0 2147483647) (= |main_~#x~0.offset| 0) (= |#NULL.offset| 0) (<= (+ |#StackHeapBarrier| 1) |main_~#x~0.base|) (= |#NULL.base| 0))' at error location [2023-04-02 14:30:05,099 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:30:05,099 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:30:05,099 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 22 [2023-04-02 14:30:05,099 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089678221] [2023-04-02 14:30:05,100 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:30:05,100 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-04-02 14:30:05,100 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:30:05,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-04-02 14:30:05,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=1022, Unknown=8, NotChecked=0, Total=1332 [2023-04-02 14:30:05,101 INFO L87 Difference]: Start difference. First operand 73 states and 77 transitions. Second operand has 22 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-04-02 14:30:05,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:30:05,135 INFO L93 Difference]: Finished difference Result 106 states and 115 transitions. [2023-04-02 14:30:05,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-04-02 14:30:05,135 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 118 [2023-04-02 14:30:05,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:30:05,136 INFO L225 Difference]: With dead ends: 106 [2023-04-02 14:30:05,136 INFO L226 Difference]: Without dead ends: 78 [2023-04-02 14:30:05,137 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 323 SyntacticMatches, 12 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 549 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=302, Invalid=1022, Unknown=8, NotChecked=0, Total=1332 [2023-04-02 14:30:05,137 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:30:05,138 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 46 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:30:05,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2023-04-02 14:30:05,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2023-04-02 14:30:05,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 14:30:05,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 82 transitions. [2023-04-02 14:30:05,143 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 82 transitions. Word has length 118 [2023-04-02 14:30:05,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:30:05,143 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 82 transitions. [2023-04-02 14:30:05,143 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-04-02 14:30:05,143 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 82 transitions. [2023-04-02 14:30:05,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-04-02 14:30:05,144 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:30:05,145 INFO L195 NwaCegarLoop]: trace histogram [60, 20, 19, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:30:05,165 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 14:30:05,352 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 14:30:05,352 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:30:05,352 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:30:05,352 INFO L85 PathProgramCache]: Analyzing trace with hash -729535966, now seen corresponding path program 10 times [2023-04-02 14:30:05,352 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:30:05,352 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [485654933] [2023-04-02 14:30:05,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:30:05,353 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms