/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/array-industry-pattern/array_shadowinit.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 14:22:42,552 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 14:22:42,554 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 14:22:42,588 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 14:22:42,588 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 14:22:42,591 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 14:22:42,596 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 14:22:42,598 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 14:22:42,600 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 14:22:42,604 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 14:22:42,605 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 14:22:42,607 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 14:22:42,607 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 14:22:42,609 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 14:22:42,611 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 14:22:42,612 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 14:22:42,612 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 14:22:42,613 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 14:22:42,615 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 14:22:42,619 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 14:22:42,620 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 14:22:42,622 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 14:22:42,622 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 14:22:42,623 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 14:22:42,631 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-04-02 14:22:42,633 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 14:22:42,634 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 14:22:42,634 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 14:22:42,635 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 14:22:42,635 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 14:22:42,635 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 14:22:42,636 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 14:22:42,636 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 14:22:42,636 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 14:22:42,636 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 14:22:42,637 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 14:22:42,638 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 14:22:42,668 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 14:22:42,668 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 14:22:42,669 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 14:22:42,669 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 14:22:42,670 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 14:22:42,670 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 14:22:42,670 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 14:22:42,670 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 14:22:42,670 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 14:22:42,670 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 14:22:42,671 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 14:22:42,671 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 14:22:42,672 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 14:22:42,672 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 14:22:42,672 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 14:22:42,672 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 14:22:42,673 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 14:22:42,673 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 14:22:42,673 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 14:22:42,673 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 14:22:42,674 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 14:22:42,674 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 14:22:42,674 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 14:22:42,674 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 14:22:42,674 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 14:22:42,674 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 14:22:42,674 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 14:22:42,674 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 14:22:42,674 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 14:22:42,675 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 14:22:42,675 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 14:22:42,675 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 14:22:42,675 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 14:22:42,675 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 14:22:42,675 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 14:22:42,676 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 14:22:42,676 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 14:22:42,676 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 14:22:42,676 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 14:22:42,676 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 14:22:42,676 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 14:22:42,676 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 14:22:42,918 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 14:22:42,945 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 14:22:42,947 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 14:22:42,948 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 14:22:42,949 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 14:22:42,950 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-industry-pattern/array_shadowinit.i [2023-04-02 14:22:44,083 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 14:22:44,255 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 14:22:44,255 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-industry-pattern/array_shadowinit.i [2023-04-02 14:22:44,260 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3bbbe770e/20498f5488de4491afddfea7f6219b16/FLAG8baf937fa [2023-04-02 14:22:44,274 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3bbbe770e/20498f5488de4491afddfea7f6219b16 [2023-04-02 14:22:44,276 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 14:22:44,278 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 14:22:44,279 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 14:22:44,279 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 14:22:44,282 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 14:22:44,282 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 02:22:44" (1/1) ... [2023-04-02 14:22:44,283 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1cfac3af and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:22:44, skipping insertion in model container [2023-04-02 14:22:44,283 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 02:22:44" (1/1) ... [2023-04-02 14:22:44,289 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 14:22:44,301 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 14:22:44,423 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-industry-pattern/array_shadowinit.i[809,822] [2023-04-02 14:22:44,439 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 14:22:44,449 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 14:22:44,459 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-industry-pattern/array_shadowinit.i[809,822] [2023-04-02 14:22:44,464 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 14:22:44,476 INFO L208 MainTranslator]: Completed translation [2023-04-02 14:22:44,477 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:22:44 WrapperNode [2023-04-02 14:22:44,477 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 14:22:44,478 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 14:22:44,478 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 14:22:44,479 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 14:22:44,487 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:22:44" (1/1) ... [2023-04-02 14:22:44,487 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:22:44" (1/1) ... [2023-04-02 14:22:44,493 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:22:44" (1/1) ... [2023-04-02 14:22:44,493 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:22:44" (1/1) ... [2023-04-02 14:22:44,496 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:22:44" (1/1) ... [2023-04-02 14:22:44,499 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:22:44" (1/1) ... [2023-04-02 14:22:44,500 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:22:44" (1/1) ... [2023-04-02 14:22:44,501 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:22:44" (1/1) ... [2023-04-02 14:22:44,502 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 14:22:44,503 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 14:22:44,503 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 14:22:44,503 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 14:22:44,504 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:22:44" (1/1) ... [2023-04-02 14:22:44,508 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 14:22:44,517 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:22:44,528 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 14:22:44,530 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 14:22:44,556 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 14:22:44,557 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 14:22:44,557 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 14:22:44,557 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 14:22:44,557 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 14:22:44,557 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 14:22:44,557 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 14:22:44,557 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-02 14:22:44,557 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-02 14:22:44,558 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 14:22:44,558 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 14:22:44,558 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 14:22:44,558 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 14:22:44,558 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 14:22:44,558 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-02 14:22:44,558 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 14:22:44,559 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 14:22:44,559 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 14:22:44,559 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 14:22:44,559 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 14:22:44,559 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 14:22:44,620 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 14:22:44,622 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 14:22:44,796 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 14:22:44,835 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 14:22:44,835 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-04-02 14:22:44,838 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 02:22:44 BoogieIcfgContainer [2023-04-02 14:22:44,838 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 14:22:44,840 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 14:22:44,840 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 14:22:44,853 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 14:22:44,853 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 02:22:44" (1/3) ... [2023-04-02 14:22:44,854 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@111f55f1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 02:22:44, skipping insertion in model container [2023-04-02 14:22:44,854 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:22:44" (2/3) ... [2023-04-02 14:22:44,854 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@111f55f1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 02:22:44, skipping insertion in model container [2023-04-02 14:22:44,854 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 02:22:44" (3/3) ... [2023-04-02 14:22:44,856 INFO L112 eAbstractionObserver]: Analyzing ICFG array_shadowinit.i [2023-04-02 14:22:44,887 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 14:22:44,887 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 14:22:44,942 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 14:22:44,948 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;@48659cb2, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 14:22:44,949 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 14:22:44,953 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 14:22:44,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-04-02 14:22:44,959 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:22:44,960 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:22:44,961 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:22:44,967 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:22:44,968 INFO L85 PathProgramCache]: Analyzing trace with hash 1438647930, now seen corresponding path program 1 times [2023-04-02 14:22:44,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:22:44,976 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [611370393] [2023-04-02 14:22:44,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:22:44,977 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:22:45,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:22:45,209 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:22:45,213 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:22:45,214 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [611370393] [2023-04-02 14:22:45,214 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [611370393] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 14:22:45,214 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 14:22:45,215 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-02 14:22:45,217 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480662372] [2023-04-02 14:22:45,218 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 14:22:45,221 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 14:22:45,223 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:22:45,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 14:22:45,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 14:22:45,268 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:22:45,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:22:45,341 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2023-04-02 14:22:45,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 14:22:45,345 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2023-04-02 14:22:45,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:22:45,349 INFO L225 Difference]: With dead ends: 34 [2023-04-02 14:22:45,349 INFO L226 Difference]: Without dead ends: 17 [2023-04-02 14:22:45,352 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 14:22:45,355 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:22:45,355 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:22:45,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-04-02 14:22:45,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-04-02 14:22:45,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 14:22:45,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2023-04-02 14:22:45,382 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 12 [2023-04-02 14:22:45,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:22:45,382 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2023-04-02 14:22:45,383 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:22:45,383 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2023-04-02 14:22:45,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-04-02 14:22:45,383 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:22:45,384 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:22:45,384 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 14:22:45,384 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:22:45,385 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:22:45,385 INFO L85 PathProgramCache]: Analyzing trace with hash -461102471, now seen corresponding path program 1 times [2023-04-02 14:22:45,385 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:22:45,385 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [791254849] [2023-04-02 14:22:45,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:22:45,386 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:22:45,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:22:45,922 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:22:45,923 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:22:45,923 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [791254849] [2023-04-02 14:22:45,923 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [791254849] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:22:45,923 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [715962555] [2023-04-02 14:22:45,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:22:45,924 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:22:45,924 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:22:45,927 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 14:22:45,928 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 14:22:45,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:22:45,983 INFO L262 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 18 conjunts are in the unsatisfiable core [2023-04-02 14:22:45,988 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:22:46,041 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 14:22:46,130 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:22:46,130 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:22:46,213 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2023-04-02 14:22:46,232 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2023-04-02 14:22:46,270 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:22:46,271 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [715962555] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:22:46,271 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [954821113] [2023-04-02 14:22:46,297 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-02 14:22:46,297 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:22:46,301 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:22:46,307 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:22:46,308 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:22:46,414 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:22:46,613 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 44 for LOIs [2023-04-02 14:22:46,649 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:22:46,656 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:22:47,238 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '187#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (exists ((|v_main_~#a~0.base_BEFORE_CALL_1| Int)) (and (<= 2 |v_main_~#a~0.base_BEFORE_CALL_1|) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_1|) (<= 3 (+ ~N~0 |v_main_~#a~0.base_BEFORE_CALL_1|)) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_1|)) (<= ~N~0 (+ 2147483645 |v_main_~#a~0.base_BEFORE_CALL_1|)) (not (= (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_1|) 0) 0)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:22:47,238 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:22:47,238 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:22:47,238 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2023-04-02 14:22:47,239 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945488312] [2023-04-02 14:22:47,239 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:22:47,240 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-02 14:22:47,240 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:22:47,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-02 14:22:47,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=538, Unknown=0, NotChecked=0, Total=600 [2023-04-02 14:22:47,242 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 14 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:22:47,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:22:47,381 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2023-04-02 14:22:47,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-02 14:22:47,382 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2023-04-02 14:22:47,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:22:47,383 INFO L225 Difference]: With dead ends: 26 [2023-04-02 14:22:47,383 INFO L226 Difference]: Without dead ends: 24 [2023-04-02 14:22:47,384 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=76, Invalid=626, Unknown=0, NotChecked=0, Total=702 [2023-04-02 14:22:47,386 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 12 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:22:47,390 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 83 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:22:47,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-04-02 14:22:47,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2023-04-02 14:22:47,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 16 states have internal predecessors, (17), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 14:22:47,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2023-04-02 14:22:47,400 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 13 [2023-04-02 14:22:47,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:22:47,417 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2023-04-02 14:22:47,417 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:22:47,417 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2023-04-02 14:22:47,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-04-02 14:22:47,419 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:22:47,419 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:22:47,430 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-04-02 14:22:47,630 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 14:22:47,631 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:22:47,631 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:22:47,631 INFO L85 PathProgramCache]: Analyzing trace with hash -2082752711, now seen corresponding path program 1 times [2023-04-02 14:22:47,632 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:22:47,632 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443895560] [2023-04-02 14:22:47,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:22:47,632 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:22:47,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:22:47,709 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:22:47,710 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:22:47,710 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1443895560] [2023-04-02 14:22:47,710 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1443895560] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:22:47,711 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2140663761] [2023-04-02 14:22:47,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:22:47,711 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:22:47,711 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:22:47,713 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 14:22:47,740 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 14:22:47,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:22:47,776 INFO L262 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-02 14:22:47,779 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:22:47,835 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:22:47,835 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:22:47,869 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:22:47,869 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2140663761] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:22:47,869 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1190005319] [2023-04-02 14:22:47,872 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:22:47,872 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:22:47,872 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:22:47,872 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:22:47,873 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:22:47,897 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:22:48,233 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:22:48,265 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:22:48,270 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:22:48,980 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '403#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:22:48,980 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:22:48,980 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:22:48,981 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 6] total 11 [2023-04-02 14:22:48,981 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428973568] [2023-04-02 14:22:48,981 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:22:48,981 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-02 14:22:48,982 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:22:48,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-02 14:22:48,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2023-04-02 14:22:48,983 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 11 states have internal predecessors, (26), 5 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 14:22:49,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:22:49,047 INFO L93 Difference]: Finished difference Result 45 states and 48 transitions. [2023-04-02 14:22:49,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-02 14:22:49,048 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 11 states have internal predecessors, (26), 5 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 20 [2023-04-02 14:22:49,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:22:49,050 INFO L225 Difference]: With dead ends: 45 [2023-04-02 14:22:49,050 INFO L226 Difference]: Without dead ends: 28 [2023-04-02 14:22:49,050 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=83, Invalid=517, Unknown=0, NotChecked=0, Total=600 [2023-04-02 14:22:49,051 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 5 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:22:49,052 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 40 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:22:49,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-04-02 14:22:49,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 24. [2023-04-02 14:22:49,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.125) internal successors, (18), 17 states have internal predecessors, (18), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 14:22:49,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2023-04-02 14:22:49,059 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 20 [2023-04-02 14:22:49,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:22:49,060 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2023-04-02 14:22:49,060 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 11 states have internal predecessors, (26), 5 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 14:22:49,060 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2023-04-02 14:22:49,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-02 14:22:49,061 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:22:49,061 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:22:49,068 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 14:22:49,273 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 14:22:49,273 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:22:49,274 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:22:49,274 INFO L85 PathProgramCache]: Analyzing trace with hash -159423432, now seen corresponding path program 2 times [2023-04-02 14:22:49,274 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:22:49,274 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [70646906] [2023-04-02 14:22:49,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:22:49,275 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:22:49,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:22:49,540 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:22:49,540 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:22:49,540 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [70646906] [2023-04-02 14:22:49,541 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [70646906] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:22:49,542 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1808693153] [2023-04-02 14:22:49,543 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:22:49,543 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:22:49,544 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:22:49,547 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 14:22:49,574 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 14:22:49,605 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-02 14:22:49,606 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:22:49,607 INFO L262 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 37 conjunts are in the unsatisfiable core [2023-04-02 14:22:49,611 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:22:49,635 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 14:22:49,661 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-04-02 14:22:49,914 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 14:22:49,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 14:22:49,916 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 14:22:49,917 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 13 [2023-04-02 14:22:49,952 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:22:49,953 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:22:50,077 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1808693153] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:22:50,077 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [845056284] [2023-04-02 14:22:50,079 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:22:50,079 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:22:50,080 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:22:50,080 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:22:50,080 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:22:50,102 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:22:50,380 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:22:50,411 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:22:50,415 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:22:51,282 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '628#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:22:51,283 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:22:51,283 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 14:22:51,283 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 21 [2023-04-02 14:22:51,283 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558856691] [2023-04-02 14:22:51,283 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 14:22:51,284 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-04-02 14:22:51,284 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:22:51,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-04-02 14:22:51,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1283, Unknown=0, NotChecked=0, Total=1406 [2023-04-02 14:22:51,285 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 21 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 14:22:51,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:22:51,582 INFO L93 Difference]: Finished difference Result 50 states and 53 transitions. [2023-04-02 14:22:51,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-04-02 14:22:51,585 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 21 [2023-04-02 14:22:51,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:22:51,586 INFO L225 Difference]: With dead ends: 50 [2023-04-02 14:22:51,586 INFO L226 Difference]: Without dead ends: 33 [2023-04-02 14:22:51,587 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 504 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=189, Invalid=1791, Unknown=0, NotChecked=0, Total=1980 [2023-04-02 14:22:51,589 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 34 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 188 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 188 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:22:51,590 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 83 Invalid, 209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 188 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:22:51,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-04-02 14:22:51,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2023-04-02 14:22:51,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 23 states have internal predecessors, (24), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 14:22:51,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2023-04-02 14:22:51,595 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 21 [2023-04-02 14:22:51,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:22:51,596 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2023-04-02 14:22:51,596 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 14:22:51,596 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2023-04-02 14:22:51,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-04-02 14:22:51,596 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:22:51,597 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:22:51,607 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 14:22:51,802 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 14:22:51,803 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:22:51,803 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:22:51,803 INFO L85 PathProgramCache]: Analyzing trace with hash -918024551, now seen corresponding path program 3 times [2023-04-02 14:22:51,803 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:22:51,803 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [437345985] [2023-04-02 14:22:51,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:22:51,804 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:22:51,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:22:52,133 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 14:22:52,133 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:22:52,133 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [437345985] [2023-04-02 14:22:52,134 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [437345985] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:22:52,134 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1979272095] [2023-04-02 14:22:52,134 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:22:52,134 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:22:52,134 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:22:52,135 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 14:22:52,159 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 14:22:52,198 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:22:52,199 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:22:52,200 INFO L262 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 29 conjunts are in the unsatisfiable core [2023-04-02 14:22:52,202 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:22:52,216 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-04-02 14:22:52,407 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-04-02 14:22:52,407 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 10 [2023-04-02 14:22:52,452 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 14:22:52,452 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:22:52,566 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2023-04-02 14:22:52,569 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-04-02 14:22:52,581 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 14:22:52,582 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1979272095] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:22:52,582 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1839037242] [2023-04-02 14:22:52,583 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:22:52,584 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:22:52,584 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:22:52,584 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:22:52,584 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:22:52,609 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:22:52,890 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:22:52,923 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:22:52,927 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:22:53,655 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '971#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:22:53,656 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:22:53,656 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:22:53,656 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 15, 12] total 21 [2023-04-02 14:22:53,656 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974402022] [2023-04-02 14:22:53,656 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:22:53,657 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-04-02 14:22:53,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:22:53,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-04-02 14:22:53,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2023-04-02 14:22:53,658 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 21 states, 19 states have (on average 1.6842105263157894) internal successors, (32), 19 states have internal predecessors, (32), 7 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2023-04-02 14:22:53,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:22:53,929 INFO L93 Difference]: Finished difference Result 42 states and 43 transitions. [2023-04-02 14:22:53,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-04-02 14:22:53,929 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 1.6842105263157894) internal successors, (32), 19 states have internal predecessors, (32), 7 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 29 [2023-04-02 14:22:53,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:22:53,930 INFO L225 Difference]: With dead ends: 42 [2023-04-02 14:22:53,930 INFO L226 Difference]: Without dead ends: 40 [2023-04-02 14:22:53,931 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 57 SyntacticMatches, 9 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 357 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=151, Invalid=1489, Unknown=0, NotChecked=0, Total=1640 [2023-04-02 14:22:53,932 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 18 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:22:53,932 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 106 Invalid, 280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:22:53,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2023-04-02 14:22:53,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2023-04-02 14:22:53,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 28 states have internal predecessors, (29), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-02 14:22:53,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2023-04-02 14:22:53,939 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 29 [2023-04-02 14:22:53,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:22:53,940 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2023-04-02 14:22:53,940 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 1.6842105263157894) internal successors, (32), 19 states have internal predecessors, (32), 7 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2023-04-02 14:22:53,940 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2023-04-02 14:22:53,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-04-02 14:22:53,941 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:22:53,941 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:22:53,958 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-04-02 14:22:54,141 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 14:22:54,141 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:22:54,142 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:22:54,142 INFO L85 PathProgramCache]: Analyzing trace with hash -549722343, now seen corresponding path program 4 times [2023-04-02 14:22:54,142 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:22:54,142 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1286106291] [2023-04-02 14:22:54,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:22:54,142 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:22:54,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:22:54,257 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 14 proven. 13 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 14:22:54,257 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:22:54,258 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1286106291] [2023-04-02 14:22:54,258 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1286106291] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:22:54,258 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [167755296] [2023-04-02 14:22:54,258 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:22:54,258 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:22:54,258 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:22:54,259 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 14:22:54,269 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 14:22:54,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:22:54,324 INFO L262 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-02 14:22:54,327 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:22:54,429 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 21 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 14:22:54,430 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:22:54,498 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 21 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 14:22:54,498 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [167755296] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:22:54,498 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [673056465] [2023-04-02 14:22:54,501 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:22:54,501 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:22:54,501 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:22:54,501 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:22:54,501 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:22:54,545 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:22:54,772 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:22:54,795 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:22:54,798 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:22:55,419 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1349#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:22:55,419 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:22:55,419 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:22:55,419 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 10] total 17 [2023-04-02 14:22:55,419 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261745885] [2023-04-02 14:22:55,419 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:22:55,420 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-02 14:22:55,420 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:22:55,421 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-02 14:22:55,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=755, Unknown=0, NotChecked=0, Total=870 [2023-04-02 14:22:55,421 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 9 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-04-02 14:22:55,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:22:55,553 INFO L93 Difference]: Finished difference Result 75 states and 78 transitions. [2023-04-02 14:22:55,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-04-02 14:22:55,554 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 9 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 36 [2023-04-02 14:22:55,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:22:55,554 INFO L225 Difference]: With dead ends: 75 [2023-04-02 14:22:55,554 INFO L226 Difference]: Without dead ends: 44 [2023-04-02 14:22:55,555 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 83 SyntacticMatches, 6 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 394 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=148, Invalid=908, Unknown=0, NotChecked=0, Total=1056 [2023-04-02 14:22:55,556 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 11 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:22:55,556 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 75 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:22:55,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-04-02 14:22:55,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 40. [2023-04-02 14:22:55,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 29 states have internal predecessors, (30), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-02 14:22:55,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2023-04-02 14:22:55,563 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 36 [2023-04-02 14:22:55,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:22:55,563 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2023-04-02 14:22:55,564 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 9 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-04-02 14:22:55,564 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2023-04-02 14:22:55,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-04-02 14:22:55,564 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:22:55,565 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:22:55,570 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 14:22:55,769 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 14:22:55,769 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:22:55,769 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:22:55,769 INFO L85 PathProgramCache]: Analyzing trace with hash 641447448, now seen corresponding path program 5 times [2023-04-02 14:22:55,769 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:22:55,770 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1351814882] [2023-04-02 14:22:55,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:22:55,770 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:22:55,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:22:56,043 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 6 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 14:22:56,044 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:22:56,044 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1351814882] [2023-04-02 14:22:56,044 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1351814882] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:22:56,044 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1093545541] [2023-04-02 14:22:56,044 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:22:56,044 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:22:56,044 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:22:56,046 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 14:22:56,072 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 14:22:56,137 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-02 14:22:56,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:22:56,138 INFO L262 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 40 conjunts are in the unsatisfiable core [2023-04-02 14:22:56,140 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:22:56,212 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-04-02 14:22:56,629 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 14:22:56,630 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:22:56,859 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2023-04-02 14:22:56,862 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-04-02 14:22:56,967 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 6 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 14:22:56,967 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1093545541] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:22:56,967 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1113648338] [2023-04-02 14:22:56,969 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:22:56,969 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:22:56,969 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:22:56,969 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:22:56,969 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:22:56,989 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:22:57,199 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:22:57,221 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:22:57,224 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:22:58,094 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1797#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:22:58,095 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:22:58,095 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:22:58,095 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17, 14] total 38 [2023-04-02 14:22:58,095 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290462108] [2023-04-02 14:22:58,095 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:22:58,096 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2023-04-02 14:22:58,096 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:22:58,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2023-04-02 14:22:58,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=2357, Unknown=0, NotChecked=0, Total=2550 [2023-04-02 14:22:58,098 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 38 states, 36 states have (on average 1.5277777777777777) internal successors, (55), 36 states have internal predecessors, (55), 12 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-02 14:22:59,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:22:59,177 INFO L93 Difference]: Finished difference Result 100 states and 107 transitions. [2023-04-02 14:22:59,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2023-04-02 14:22:59,178 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 36 states have (on average 1.5277777777777777) internal successors, (55), 36 states have internal predecessors, (55), 12 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 37 [2023-04-02 14:22:59,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:22:59,179 INFO L225 Difference]: With dead ends: 100 [2023-04-02 14:22:59,179 INFO L226 Difference]: Without dead ends: 98 [2023-04-02 14:22:59,182 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 71 SyntacticMatches, 5 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1365 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=488, Invalid=4914, Unknown=0, NotChecked=0, Total=5402 [2023-04-02 14:22:59,182 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 58 mSDsluCounter, 193 mSDsCounter, 0 mSdLazyCounter, 585 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 208 SdHoareTripleChecker+Invalid, 647 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 585 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 14:22:59,182 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 208 Invalid, 647 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 585 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 14:22:59,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2023-04-02 14:22:59,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 87. [2023-04-02 14:22:59,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 61 states have (on average 1.0491803278688525) internal successors, (64), 63 states have internal predecessors, (64), 15 states have call successors, (15), 11 states have call predecessors, (15), 10 states have return successors, (14), 12 states have call predecessors, (14), 14 states have call successors, (14) [2023-04-02 14:22:59,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 93 transitions. [2023-04-02 14:22:59,198 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 93 transitions. Word has length 37 [2023-04-02 14:22:59,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:22:59,199 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 93 transitions. [2023-04-02 14:22:59,199 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 36 states have (on average 1.5277777777777777) internal successors, (55), 36 states have internal predecessors, (55), 12 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-02 14:22:59,199 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 93 transitions. [2023-04-02 14:22:59,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-04-02 14:22:59,201 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:22:59,201 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:22:59,212 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 14:22:59,406 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 14:22:59,407 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:22:59,407 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:22:59,407 INFO L85 PathProgramCache]: Analyzing trace with hash -1587543367, now seen corresponding path program 6 times [2023-04-02 14:22:59,407 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:22:59,407 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1174847602] [2023-04-02 14:22:59,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:22:59,407 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:22:59,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:22:59,939 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 8 proven. 41 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-04-02 14:22:59,940 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:22:59,940 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1174847602] [2023-04-02 14:22:59,940 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1174847602] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:22:59,940 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1116663548] [2023-04-02 14:22:59,940 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:22:59,940 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:22:59,940 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:22:59,941 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 14:22:59,969 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 14:23:00,024 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:23:00,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:23:00,025 INFO L262 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 37 conjunts are in the unsatisfiable core [2023-04-02 14:23:00,033 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:23:00,101 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-04-02 14:23:00,530 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-02 14:23:00,530 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:23:00,682 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2023-04-02 14:23:00,684 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-04-02 14:23:00,693 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 8 proven. 41 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-04-02 14:23:00,693 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1116663548] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:23:00,693 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1208440221] [2023-04-02 14:23:00,695 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:23:00,695 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:23:00,695 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:23:00,695 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:23:00,695 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:23:00,718 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:23:00,951 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:23:00,973 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:23:00,976 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:23:01,825 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2442#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:23:01,826 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:23:01,826 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:23:01,826 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 19, 16] total 38 [2023-04-02 14:23:01,826 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296371861] [2023-04-02 14:23:01,826 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:23:01,827 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2023-04-02 14:23:01,827 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:23:01,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2023-04-02 14:23:01,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=2397, Unknown=0, NotChecked=0, Total=2550 [2023-04-02 14:23:01,829 INFO L87 Difference]: Start difference. First operand 87 states and 93 transitions. Second operand has 38 states, 36 states have (on average 1.6111111111111112) internal successors, (58), 36 states have internal predecessors, (58), 15 states have call successors, (16), 4 states have call predecessors, (16), 3 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2023-04-02 14:23:02,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:23:02,632 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2023-04-02 14:23:02,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-04-02 14:23:02,632 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 36 states have (on average 1.6111111111111112) internal successors, (58), 36 states have internal predecessors, (58), 15 states have call successors, (16), 4 states have call predecessors, (16), 3 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Word has length 45 [2023-04-02 14:23:02,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:23:02,635 INFO L225 Difference]: With dead ends: 106 [2023-04-02 14:23:02,635 INFO L226 Difference]: Without dead ends: 104 [2023-04-02 14:23:02,636 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 94 SyntacticMatches, 7 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 890 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=270, Invalid=3762, Unknown=0, NotChecked=0, Total=4032 [2023-04-02 14:23:02,636 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 32 mSDsluCounter, 295 mSDsCounter, 0 mSdLazyCounter, 852 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 315 SdHoareTripleChecker+Invalid, 871 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 852 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-02 14:23:02,637 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 315 Invalid, 871 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 852 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-02 14:23:02,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2023-04-02 14:23:02,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 94. [2023-04-02 14:23:02,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 68 states have internal predecessors, (69), 16 states have call successors, (16), 12 states have call predecessors, (16), 11 states have return successors, (15), 13 states have call predecessors, (15), 15 states have call successors, (15) [2023-04-02 14:23:02,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 100 transitions. [2023-04-02 14:23:02,653 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 100 transitions. Word has length 45 [2023-04-02 14:23:02,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:23:02,653 INFO L495 AbstractCegarLoop]: Abstraction has 94 states and 100 transitions. [2023-04-02 14:23:02,654 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 36 states have (on average 1.6111111111111112) internal successors, (58), 36 states have internal predecessors, (58), 15 states have call successors, (16), 4 states have call predecessors, (16), 3 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2023-04-02 14:23:02,654 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 100 transitions. [2023-04-02 14:23:02,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2023-04-02 14:23:02,655 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:23:02,655 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:23:02,663 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 14:23:02,860 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 14:23:02,861 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:23:02,861 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:23:02,861 INFO L85 PathProgramCache]: Analyzing trace with hash -1439756551, now seen corresponding path program 7 times [2023-04-02 14:23:02,862 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:23:02,862 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [965552642] [2023-04-02 14:23:02,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:23:02,862 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:23:02,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:23:03,047 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 37 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-04-02 14:23:03,047 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:23:03,048 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [965552642] [2023-04-02 14:23:03,048 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [965552642] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:23:03,048 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1874559524] [2023-04-02 14:23:03,048 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:23:03,048 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:23:03,048 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:23:03,049 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 14:23:03,060 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 14:23:03,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:23:03,118 INFO L262 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 14 conjunts are in the unsatisfiable core [2023-04-02 14:23:03,121 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:23:03,274 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 50 proven. 15 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-04-02 14:23:03,275 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:23:03,366 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 50 proven. 15 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-04-02 14:23:03,366 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1874559524] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:23:03,366 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1482419951] [2023-04-02 14:23:03,368 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:23:03,368 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:23:03,368 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:23:03,368 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:23:03,368 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:23:03,395 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:23:03,659 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:23:03,688 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:23:03,692 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:23:04,293 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3112#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:23:04,293 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:23:04,293 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:23:04,293 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 14] total 23 [2023-04-02 14:23:04,293 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021187281] [2023-04-02 14:23:04,294 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:23:04,294 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-04-02 14:23:04,294 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:23:04,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-04-02 14:23:04,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1089, Unknown=0, NotChecked=0, Total=1260 [2023-04-02 14:23:04,295 INFO L87 Difference]: Start difference. First operand 94 states and 100 transitions. Second operand has 23 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 13 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-04-02 14:23:04,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:23:04,543 INFO L93 Difference]: Finished difference Result 148 states and 155 transitions. [2023-04-02 14:23:04,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-04-02 14:23:04,544 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 13 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Word has length 52 [2023-04-02 14:23:04,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:23:04,544 INFO L225 Difference]: With dead ends: 148 [2023-04-02 14:23:04,544 INFO L226 Difference]: Without dead ends: 60 [2023-04-02 14:23:04,545 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 125 SyntacticMatches, 10 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 730 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=317, Invalid=1753, Unknown=0, NotChecked=0, Total=2070 [2023-04-02 14:23:04,546 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 22 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 180 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:23:04,546 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 71 Invalid, 218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 180 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:23:04,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-04-02 14:23:04,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 56. [2023-04-02 14:23:04,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 40 states have (on average 1.05) internal successors, (42), 41 states have internal predecessors, (42), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-02 14:23:04,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2023-04-02 14:23:04,555 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 52 [2023-04-02 14:23:04,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:23:04,555 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2023-04-02 14:23:04,555 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 13 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-04-02 14:23:04,555 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2023-04-02 14:23:04,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-04-02 14:23:04,556 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:23:04,556 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:23:04,565 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-04-02 14:23:04,762 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 14:23:04,762 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:23:04,763 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:23:04,763 INFO L85 PathProgramCache]: Analyzing trace with hash 486998008, now seen corresponding path program 8 times [2023-04-02 14:23:04,763 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:23:04,763 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [395764787] [2023-04-02 14:23:04,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:23:04,763 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:23:04,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:23:05,207 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 10 proven. 61 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-04-02 14:23:05,207 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:23:05,207 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [395764787] [2023-04-02 14:23:05,208 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [395764787] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:23:05,208 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338453681] [2023-04-02 14:23:05,208 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:23:05,208 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:23:05,208 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:23:05,209 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 14:23:05,232 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 14:23:05,381 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-04-02 14:23:05,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:23:05,384 INFO L262 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 53 conjunts are in the unsatisfiable core [2023-04-02 14:23:05,386 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:23:05,492 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-04-02 14:23:06,023 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 6 proven. 77 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-04-02 14:23:06,023 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:23:06,104 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2023-04-02 14:23:06,112 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-04-02 14:23:06,139 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 10 proven. 61 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-04-02 14:23:06,140 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1338453681] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:23:06,140 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [809178782] [2023-04-02 14:23:06,141 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:23:06,141 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:23:06,142 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:23:06,142 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:23:06,142 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:23:06,156 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:23:06,369 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:23:06,390 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:23:06,394 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:23:07,318 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3799#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:23:07,318 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:23:07,318 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:23:07,318 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 21, 18] total 35 [2023-04-02 14:23:07,319 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [893828269] [2023-04-02 14:23:07,319 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:23:07,319 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-04-02 14:23:07,319 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:23:07,320 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-04-02 14:23:07,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=2117, Unknown=0, NotChecked=0, Total=2256 [2023-04-02 14:23:07,321 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand has 35 states, 33 states have (on average 1.6363636363636365) internal successors, (54), 33 states have internal predecessors, (54), 13 states have call successors, (15), 4 states have call predecessors, (15), 3 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2023-04-02 14:23:07,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:23:07,876 INFO L93 Difference]: Finished difference Result 66 states and 67 transitions. [2023-04-02 14:23:07,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-04-02 14:23:07,877 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 33 states have (on average 1.6363636363636365) internal successors, (54), 33 states have internal predecessors, (54), 13 states have call successors, (15), 4 states have call predecessors, (15), 3 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) Word has length 53 [2023-04-02 14:23:07,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:23:07,878 INFO L225 Difference]: With dead ends: 66 [2023-04-02 14:23:07,878 INFO L226 Difference]: Without dead ends: 64 [2023-04-02 14:23:07,879 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 117 SyntacticMatches, 13 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 753 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=217, Invalid=3089, Unknown=0, NotChecked=0, Total=3306 [2023-04-02 14:23:07,879 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 17 mSDsluCounter, 183 mSDsCounter, 0 mSdLazyCounter, 866 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 880 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 866 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 14:23:07,880 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 198 Invalid, 880 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 866 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 14:23:07,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2023-04-02 14:23:07,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2023-04-02 14:23:07,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 46 states have internal predecessors, (47), 9 states have call successors, (9), 9 states have call predecessors, (9), 8 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2023-04-02 14:23:07,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2023-04-02 14:23:07,889 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 53 [2023-04-02 14:23:07,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:23:07,889 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2023-04-02 14:23:07,890 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 33 states have (on average 1.6363636363636365) internal successors, (54), 33 states have internal predecessors, (54), 13 states have call successors, (15), 4 states have call predecessors, (15), 3 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2023-04-02 14:23:07,890 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2023-04-02 14:23:07,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2023-04-02 14:23:07,890 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:23:07,891 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:23:07,899 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 14:23:08,091 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 14:23:08,091 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:23:08,092 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:23:08,092 INFO L85 PathProgramCache]: Analyzing trace with hash 25918682, now seen corresponding path program 9 times [2023-04-02 14:23:08,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:23:08,092 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1438160259] [2023-04-02 14:23:08,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:23:08,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:23:08,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:23:08,309 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 53 proven. 37 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-02 14:23:08,311 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:23:08,311 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1438160259] [2023-04-02 14:23:08,311 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1438160259] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:23:08,311 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1479279226] [2023-04-02 14:23:08,311 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:23:08,311 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:23:08,312 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:23:08,313 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 14:23:08,339 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 14:23:08,396 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:23:08,397 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:23:08,398 INFO L262 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 16 conjunts are in the unsatisfiable core [2023-04-02 14:23:08,400 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:23:08,582 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 69 proven. 21 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-02 14:23:08,582 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:23:08,703 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 69 proven. 21 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-02 14:23:08,704 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1479279226] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:23:08,704 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1680176171] [2023-04-02 14:23:08,705 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:23:08,705 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:23:08,705 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:23:08,705 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:23:08,705 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:23:08,721 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:23:08,928 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:23:08,948 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:23:08,951 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:23:09,664 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4408#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:23:09,664 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:23:09,664 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:23:09,664 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 16] total 26 [2023-04-02 14:23:09,664 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577082433] [2023-04-02 14:23:09,664 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:23:09,665 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-04-02 14:23:09,665 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:23:09,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-04-02 14:23:09,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=1277, Unknown=0, NotChecked=0, Total=1482 [2023-04-02 14:23:09,666 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 26 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 26 states have internal predecessors, (51), 15 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-04-02 14:23:09,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:23:09,877 INFO L93 Difference]: Finished difference Result 120 states and 123 transitions. [2023-04-02 14:23:09,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-04-02 14:23:09,878 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 26 states have internal predecessors, (51), 15 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) Word has length 60 [2023-04-02 14:23:09,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:23:09,879 INFO L225 Difference]: With dead ends: 120 [2023-04-02 14:23:09,879 INFO L226 Difference]: Without dead ends: 68 [2023-04-02 14:23:09,882 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 146 SyntacticMatches, 12 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 793 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=298, Invalid=1682, Unknown=0, NotChecked=0, Total=1980 [2023-04-02 14:23:09,882 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 26 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:23:09,883 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 63 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 172 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:23:09,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2023-04-02 14:23:09,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 64. [2023-04-02 14:23:09,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 47 states have internal predecessors, (48), 9 states have call successors, (9), 9 states have call predecessors, (9), 8 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2023-04-02 14:23:09,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2023-04-02 14:23:09,903 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 60 [2023-04-02 14:23:09,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:23:09,903 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2023-04-02 14:23:09,903 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 26 states have internal predecessors, (51), 15 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-04-02 14:23:09,903 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2023-04-02 14:23:09,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-04-02 14:23:09,904 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:23:09,904 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:23:09,910 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 14:23:10,109 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 14:23:10,109 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:23:10,109 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:23:10,109 INFO L85 PathProgramCache]: Analyzing trace with hash -2053243175, now seen corresponding path program 10 times [2023-04-02 14:23:10,109 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:23:10,110 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [951440210] [2023-04-02 14:23:10,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:23:10,110 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:23:10,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:23:10,653 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 12 proven. 85 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-02 14:23:10,653 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:23:10,653 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [951440210] [2023-04-02 14:23:10,653 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [951440210] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:23:10,653 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1118557271] [2023-04-02 14:23:10,653 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:23:10,653 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:23:10,654 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:23:10,662 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 14:23:10,664 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 14:23:10,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:23:10,733 INFO L262 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 42 conjunts are in the unsatisfiable core [2023-04-02 14:23:10,737 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:23:10,888 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 14:23:11,593 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 0 proven. 97 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-02 14:23:11,593 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:23:11,680 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2023-04-02 14:23:11,682 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-04-02 14:23:11,709 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 12 proven. 85 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-02 14:23:11,709 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1118557271] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:23:11,709 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [137280107] [2023-04-02 14:23:11,710 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:23:11,710 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:23:11,711 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:23:11,711 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:23:11,711 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:23:11,726 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:23:11,925 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:23:11,955 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:23:11,958 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:23:12,875 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5110#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:23:12,876 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:23:12,876 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:23:12,876 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 20] total 40 [2023-04-02 14:23:12,876 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409468978] [2023-04-02 14:23:12,876 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:23:12,876 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2023-04-02 14:23:12,876 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:23:12,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2023-04-02 14:23:12,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=2594, Unknown=0, NotChecked=0, Total=2756 [2023-04-02 14:23:12,878 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand has 40 states, 38 states have (on average 1.5789473684210527) internal successors, (60), 38 states have internal predecessors, (60), 16 states have call successors, (17), 4 states have call predecessors, (17), 2 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-04-02 14:23:13,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:23:13,354 INFO L93 Difference]: Finished difference Result 74 states and 75 transitions. [2023-04-02 14:23:13,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-04-02 14:23:13,354 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 38 states have (on average 1.5789473684210527) internal successors, (60), 38 states have internal predecessors, (60), 16 states have call successors, (17), 4 states have call predecessors, (17), 2 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) Word has length 61 [2023-04-02 14:23:13,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:23:13,355 INFO L225 Difference]: With dead ends: 74 [2023-04-02 14:23:13,355 INFO L226 Difference]: Without dead ends: 72 [2023-04-02 14:23:13,356 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 138 SyntacticMatches, 13 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 769 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=189, Invalid=3003, Unknown=0, NotChecked=0, Total=3192 [2023-04-02 14:23:13,357 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 21 mSDsluCounter, 239 mSDsCounter, 0 mSdLazyCounter, 998 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 257 SdHoareTripleChecker+Invalid, 1010 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 998 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-02 14:23:13,357 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 257 Invalid, 1010 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 998 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-02 14:23:13,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2023-04-02 14:23:13,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2023-04-02 14:23:13,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 52 states have internal predecessors, (53), 10 states have call successors, (10), 10 states have call predecessors, (10), 9 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2023-04-02 14:23:13,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2023-04-02 14:23:13,378 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 61 [2023-04-02 14:23:13,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:23:13,378 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2023-04-02 14:23:13,379 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 38 states have (on average 1.5789473684210527) internal successors, (60), 38 states have internal predecessors, (60), 16 states have call successors, (17), 4 states have call predecessors, (17), 2 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-04-02 14:23:13,379 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2023-04-02 14:23:13,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2023-04-02 14:23:13,381 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:23:13,382 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:23:13,388 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 14:23:13,585 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 14:23:13,585 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:23:13,585 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:23:13,585 INFO L85 PathProgramCache]: Analyzing trace with hash -1683804455, now seen corresponding path program 11 times [2023-04-02 14:23:13,585 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:23:13,586 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [116916184] [2023-04-02 14:23:13,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:23:13,586 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:23:13,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:23:13,804 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 72 proven. 47 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2023-04-02 14:23:13,805 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:23:13,805 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [116916184] [2023-04-02 14:23:13,805 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [116916184] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:23:13,805 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1907276175] [2023-04-02 14:23:13,805 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:23:13,806 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:23:13,806 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:23:13,807 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:23:13,831 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-04-02 14:23:14,043 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2023-04-02 14:23:14,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:23:14,045 INFO L262 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 18 conjunts are in the unsatisfiable core [2023-04-02 14:23:14,046 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:23:14,268 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 91 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2023-04-02 14:23:14,268 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:23:14,415 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 91 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2023-04-02 14:23:14,416 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1907276175] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:23:14,416 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1383781921] [2023-04-02 14:23:14,417 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:23:14,417 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:23:14,417 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:23:14,418 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:23:14,418 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:23:14,432 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:23:14,629 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:23:14,650 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:23:14,653 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:23:15,366 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5782#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:23:15,366 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:23:15,366 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:23:15,366 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19, 18] total 29 [2023-04-02 14:23:15,366 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903045484] [2023-04-02 14:23:15,366 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:23:15,367 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-04-02 14:23:15,367 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:23:15,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-04-02 14:23:15,368 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=1479, Unknown=0, NotChecked=0, Total=1722 [2023-04-02 14:23:15,368 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand has 29 states, 29 states have (on average 1.9310344827586208) internal successors, (56), 29 states have internal predecessors, (56), 17 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2023-04-02 14:23:15,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:23:15,582 INFO L93 Difference]: Finished difference Result 135 states and 138 transitions. [2023-04-02 14:23:15,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-04-02 14:23:15,582 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.9310344827586208) internal successors, (56), 29 states have internal predecessors, (56), 17 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) Word has length 68 [2023-04-02 14:23:15,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:23:15,583 INFO L225 Difference]: With dead ends: 135 [2023-04-02 14:23:15,583 INFO L226 Difference]: Without dead ends: 76 [2023-04-02 14:23:15,584 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 167 SyntacticMatches, 14 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 952 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=362, Invalid=1990, Unknown=0, NotChecked=0, Total=2352 [2023-04-02 14:23:15,585 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 32 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:23:15,585 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 67 Invalid, 259 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:23:15,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-04-02 14:23:15,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 72. [2023-04-02 14:23:15,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 52 states have (on average 1.0384615384615385) internal successors, (54), 53 states have internal predecessors, (54), 10 states have call successors, (10), 10 states have call predecessors, (10), 9 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2023-04-02 14:23:15,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2023-04-02 14:23:15,597 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 68 [2023-04-02 14:23:15,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:23:15,597 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2023-04-02 14:23:15,597 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.9310344827586208) internal successors, (56), 29 states have internal predecessors, (56), 17 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2023-04-02 14:23:15,597 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2023-04-02 14:23:15,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2023-04-02 14:23:15,598 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:23:15,598 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:23:15,604 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-04-02 14:23:15,804 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-04-02 14:23:15,804 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:23:15,804 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:23:15,804 INFO L85 PathProgramCache]: Analyzing trace with hash 433013208, now seen corresponding path program 12 times [2023-04-02 14:23:15,805 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:23:15,805 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404613372] [2023-04-02 14:23:15,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:23:15,805 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:23:15,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:23:16,275 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 14 proven. 113 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2023-04-02 14:23:16,275 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:23:16,275 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404613372] [2023-04-02 14:23:16,275 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [404613372] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:23:16,275 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [930638425] [2023-04-02 14:23:16,275 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:23:16,275 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:23:16,276 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:23:16,277 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:23:16,300 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-04-02 14:23:16,379 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:23:16,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:23:16,381 INFO L262 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 49 conjunts are in the unsatisfiable core [2023-04-02 14:23:16,384 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:23:16,408 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-04-02 14:23:17,115 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2023-04-02 14:23:17,115 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:23:17,239 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2023-04-02 14:23:17,241 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-04-02 14:23:17,271 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 14 proven. 113 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2023-04-02 14:23:17,271 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [930638425] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:23:17,271 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [25680010] [2023-04-02 14:23:17,273 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:23:17,273 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:23:17,274 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:23:17,274 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:23:17,274 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:23:17,292 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:23:17,493 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:23:17,514 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:23:17,517 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:23:18,388 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6564#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:23:18,388 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:23:18,388 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:23:18,388 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 25, 22] total 36 [2023-04-02 14:23:18,388 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854255216] [2023-04-02 14:23:18,388 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:23:18,389 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-04-02 14:23:18,389 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:23:18,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-04-02 14:23:18,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=2210, Unknown=0, NotChecked=0, Total=2352 [2023-04-02 14:23:18,390 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand has 36 states, 34 states have (on average 1.7058823529411764) internal successors, (58), 34 states have internal predecessors, (58), 17 states have call successors, (19), 4 states have call predecessors, (19), 3 states have return successors, (16), 15 states have call predecessors, (16), 15 states have call successors, (16) [2023-04-02 14:23:19,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:23:19,107 INFO L93 Difference]: Finished difference Result 82 states and 83 transitions. [2023-04-02 14:23:19,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-04-02 14:23:19,107 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 34 states have (on average 1.7058823529411764) internal successors, (58), 34 states have internal predecessors, (58), 17 states have call successors, (19), 4 states have call predecessors, (19), 3 states have return successors, (16), 15 states have call predecessors, (16), 15 states have call successors, (16) Word has length 69 [2023-04-02 14:23:19,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:23:19,108 INFO L225 Difference]: With dead ends: 82 [2023-04-02 14:23:19,108 INFO L226 Difference]: Without dead ends: 80 [2023-04-02 14:23:19,109 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 164 SyntacticMatches, 17 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 676 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=236, Invalid=3424, Unknown=0, NotChecked=0, Total=3660 [2023-04-02 14:23:19,109 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 20 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 1146 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 206 SdHoareTripleChecker+Invalid, 1164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 1146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-02 14:23:19,109 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 206 Invalid, 1164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 1146 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-04-02 14:23:19,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2023-04-02 14:23:19,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2023-04-02 14:23:19,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 58 states have internal predecessors, (59), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-02 14:23:19,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2023-04-02 14:23:19,120 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 69 [2023-04-02 14:23:19,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:23:19,120 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2023-04-02 14:23:19,120 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 34 states have (on average 1.7058823529411764) internal successors, (58), 34 states have internal predecessors, (58), 17 states have call successors, (19), 4 states have call predecessors, (19), 3 states have return successors, (16), 15 states have call predecessors, (16), 15 states have call successors, (16) [2023-04-02 14:23:19,120 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2023-04-02 14:23:19,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2023-04-02 14:23:19,121 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:23:19,121 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:23:19,126 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-04-02 14:23:19,322 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-04-02 14:23:19,322 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:23:19,322 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:23:19,322 INFO L85 PathProgramCache]: Analyzing trace with hash -1523622150, now seen corresponding path program 13 times [2023-04-02 14:23:19,328 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:23:19,328 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255254711] [2023-04-02 14:23:19,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:23:19,328 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:23:19,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:23:19,572 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 94 proven. 58 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-04-02 14:23:19,572 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:23:19,572 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255254711] [2023-04-02 14:23:19,572 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1255254711] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:23:19,572 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [150482204] [2023-04-02 14:23:19,572 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:23:19,573 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:23:19,573 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:23:19,577 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:23:19,581 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-04-02 14:23:19,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:23:19,658 INFO L262 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 20 conjunts are in the unsatisfiable core [2023-04-02 14:23:19,659 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:23:19,919 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 116 proven. 36 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-04-02 14:23:19,919 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:23:20,072 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 116 proven. 36 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-04-02 14:23:20,072 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [150482204] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:23:20,072 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [89670797] [2023-04-02 14:23:20,073 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:23:20,074 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:23:20,074 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:23:20,074 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:23:20,074 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:23:20,087 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:23:20,277 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:23:20,296 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:23:20,315 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:23:20,972 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7327#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:23:20,972 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:23:20,972 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:23:20,972 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 20] total 32 [2023-04-02 14:23:20,973 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2147141803] [2023-04-02 14:23:20,973 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:23:20,973 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-04-02 14:23:20,973 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:23:20,974 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-04-02 14:23:20,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=1695, Unknown=0, NotChecked=0, Total=1980 [2023-04-02 14:23:20,974 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand has 32 states, 32 states have (on average 1.90625) internal successors, (61), 32 states have internal predecessors, (61), 19 states have call successors, (20), 3 states have call predecessors, (20), 2 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2023-04-02 14:23:21,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:23:21,186 INFO L93 Difference]: Finished difference Result 150 states and 153 transitions. [2023-04-02 14:23:21,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-04-02 14:23:21,186 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.90625) internal successors, (61), 32 states have internal predecessors, (61), 19 states have call successors, (20), 3 states have call predecessors, (20), 2 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) Word has length 76 [2023-04-02 14:23:21,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:23:21,187 INFO L225 Difference]: With dead ends: 150 [2023-04-02 14:23:21,187 INFO L226 Difference]: Without dead ends: 84 [2023-04-02 14:23:21,188 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 188 SyntacticMatches, 16 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1124 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=433, Invalid=2323, Unknown=0, NotChecked=0, Total=2756 [2023-04-02 14:23:21,189 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 48 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:23:21,189 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [57 Valid, 62 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:23:21,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2023-04-02 14:23:21,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 80. [2023-04-02 14:23:21,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 59 states have internal predecessors, (60), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-02 14:23:21,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2023-04-02 14:23:21,200 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 76 [2023-04-02 14:23:21,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:23:21,200 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2023-04-02 14:23:21,200 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.90625) internal successors, (61), 32 states have internal predecessors, (61), 19 states have call successors, (20), 3 states have call predecessors, (20), 2 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2023-04-02 14:23:21,200 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2023-04-02 14:23:21,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2023-04-02 14:23:21,201 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:23:21,201 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:23:21,209 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2023-04-02 14:23:21,406 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:23:21,407 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:23:21,407 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:23:21,407 INFO L85 PathProgramCache]: Analyzing trace with hash -1219230983, now seen corresponding path program 14 times [2023-04-02 14:23:21,407 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:23:21,407 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478861118] [2023-04-02 14:23:21,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:23:21,408 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:23:21,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:23:22,155 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 16 proven. 145 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-04-02 14:23:22,155 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:23:22,155 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478861118] [2023-04-02 14:23:22,155 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [478861118] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:23:22,155 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1401123525] [2023-04-02 14:23:22,155 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:23:22,155 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:23:22,156 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:23:22,157 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:23:22,181 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-04-02 14:23:22,457 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2023-04-02 14:23:22,458 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:23:22,460 INFO L262 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 53 conjunts are in the unsatisfiable core [2023-04-02 14:23:22,463 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:23:22,715 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 14:23:23,777 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 14:23:23,779 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 14:23:23,779 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 10 [2023-04-02 14:23:23,875 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 92 proven. 69 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-04-02 14:23:23,875 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:23:23,997 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1401123525] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:23:23,997 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1407106711] [2023-04-02 14:23:24,001 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:23:24,001 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:23:24,002 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:23:24,002 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:23:24,002 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:23:24,017 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:23:24,208 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:23:24,228 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:23:24,231 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:23:25,222 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7996#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:23:25,222 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:23:25,222 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 14:23:25,222 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25] total 47 [2023-04-02 14:23:25,222 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404852558] [2023-04-02 14:23:25,222 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 14:23:25,222 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2023-04-02 14:23:25,222 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:23:25,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2023-04-02 14:23:25,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=3572, Unknown=0, NotChecked=0, Total=3782 [2023-04-02 14:23:25,224 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand has 47 states, 45 states have (on average 1.5333333333333334) internal successors, (69), 45 states have internal predecessors, (69), 19 states have call successors, (20), 4 states have call predecessors, (20), 2 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2023-04-02 14:23:26,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:23:26,451 INFO L93 Difference]: Finished difference Result 155 states and 158 transitions. [2023-04-02 14:23:26,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2023-04-02 14:23:26,451 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 45 states have (on average 1.5333333333333334) internal successors, (69), 45 states have internal predecessors, (69), 19 states have call successors, (20), 4 states have call predecessors, (20), 2 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) Word has length 77 [2023-04-02 14:23:26,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:23:26,452 INFO L225 Difference]: With dead ends: 155 [2023-04-02 14:23:26,452 INFO L226 Difference]: Without dead ends: 89 [2023-04-02 14:23:26,453 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 109 SyntacticMatches, 15 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2014 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=501, Invalid=7871, Unknown=0, NotChecked=0, Total=8372 [2023-04-02 14:23:26,453 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 42 mSDsluCounter, 270 mSDsCounter, 0 mSdLazyCounter, 1500 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 290 SdHoareTripleChecker+Invalid, 1538 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 1500 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-02 14:23:26,453 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 290 Invalid, 1538 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 1500 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-04-02 14:23:26,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2023-04-02 14:23:26,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2023-04-02 14:23:26,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 64 states have (on average 1.03125) internal successors, (66), 65 states have internal predecessors, (66), 12 states have call successors, (12), 12 states have call predecessors, (12), 11 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2023-04-02 14:23:26,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2023-04-02 14:23:26,465 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 77 [2023-04-02 14:23:26,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:23:26,465 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2023-04-02 14:23:26,465 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 45 states have (on average 1.5333333333333334) internal successors, (69), 45 states have internal predecessors, (69), 19 states have call successors, (20), 4 states have call predecessors, (20), 2 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2023-04-02 14:23:26,466 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2023-04-02 14:23:26,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2023-04-02 14:23:26,466 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:23:26,466 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:23:26,474 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2023-04-02 14:23:26,673 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-04-02 14:23:26,673 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:23:26,673 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:23:26,674 INFO L85 PathProgramCache]: Analyzing trace with hash -1560118344, now seen corresponding path program 15 times [2023-04-02 14:23:26,674 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:23:26,674 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1626515530] [2023-04-02 14:23:26,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:23:26,674 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:23:26,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:23:27,322 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 18 proven. 181 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2023-04-02 14:23:27,322 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:23:27,322 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1626515530] [2023-04-02 14:23:27,322 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1626515530] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:23:27,322 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1982360205] [2023-04-02 14:23:27,322 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:23:27,322 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:23:27,322 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:23:27,325 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:23:27,334 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-04-02 14:23:27,526 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:23:27,526 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:23:27,529 INFO L262 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 52 conjunts are in the unsatisfiable core [2023-04-02 14:23:27,531 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:23:27,555 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-04-02 14:23:28,424 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 0 proven. 199 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2023-04-02 14:23:28,424 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:23:28,516 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2023-04-02 14:23:28,518 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-04-02 14:23:28,559 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 18 proven. 181 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2023-04-02 14:23:28,559 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1982360205] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:23:28,559 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1972439314] [2023-04-02 14:23:28,560 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:23:28,560 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:23:28,561 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:23:28,561 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:23:28,561 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:23:28,574 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:23:28,754 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:23:28,793 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:23:28,796 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:23:29,737 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8977#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:23:29,737 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:23:29,737 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:23:29,737 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 27, 26] total 40 [2023-04-02 14:23:29,737 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192107932] [2023-04-02 14:23:29,737 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:23:29,738 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2023-04-02 14:23:29,738 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:23:29,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2023-04-02 14:23:29,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=2603, Unknown=0, NotChecked=0, Total=2756 [2023-04-02 14:23:29,739 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand has 40 states, 38 states have (on average 1.7105263157894737) internal successors, (65), 38 states have internal predecessors, (65), 21 states have call successors, (23), 4 states have call predecessors, (23), 2 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) [2023-04-02 14:23:30,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:23:30,471 INFO L93 Difference]: Finished difference Result 98 states and 99 transitions. [2023-04-02 14:23:30,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-04-02 14:23:30,471 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 38 states have (on average 1.7105263157894737) internal successors, (65), 38 states have internal predecessors, (65), 21 states have call successors, (23), 4 states have call predecessors, (23), 2 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) Word has length 85 [2023-04-02 14:23:30,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:23:30,472 INFO L225 Difference]: With dead ends: 98 [2023-04-02 14:23:30,472 INFO L226 Difference]: Without dead ends: 96 [2023-04-02 14:23:30,473 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 208 SyntacticMatches, 21 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 547 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=179, Invalid=3013, Unknown=0, NotChecked=0, Total=3192 [2023-04-02 14:23:30,473 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 17 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 1682 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 313 SdHoareTripleChecker+Invalid, 1692 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1682 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-04-02 14:23:30,473 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 313 Invalid, 1692 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1682 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-04-02 14:23:30,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2023-04-02 14:23:30,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2023-04-02 14:23:30,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 69 states have (on average 1.0289855072463767) internal successors, (71), 70 states have internal predecessors, (71), 13 states have call successors, (13), 13 states have call predecessors, (13), 12 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2023-04-02 14:23:30,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 96 transitions. [2023-04-02 14:23:30,488 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 96 transitions. Word has length 85 [2023-04-02 14:23:30,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:23:30,489 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 96 transitions. [2023-04-02 14:23:30,489 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 38 states have (on average 1.7105263157894737) internal successors, (65), 38 states have internal predecessors, (65), 21 states have call successors, (23), 4 states have call predecessors, (23), 2 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) [2023-04-02 14:23:30,489 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 96 transitions. [2023-04-02 14:23:30,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2023-04-02 14:23:30,490 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:23:30,490 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:23:30,499 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2023-04-02 14:23:30,696 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-04-02 14:23:30,697 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:23:30,697 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:23:30,697 INFO L85 PathProgramCache]: Analyzing trace with hash -190756582, now seen corresponding path program 16 times [2023-04-02 14:23:30,697 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:23:30,697 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [638160067] [2023-04-02 14:23:30,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:23:30,697 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:23:30,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:23:31,068 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 147 proven. 83 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2023-04-02 14:23:31,068 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:23:31,068 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [638160067] [2023-04-02 14:23:31,068 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [638160067] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:23:31,068 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [626497122] [2023-04-02 14:23:31,069 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:23:31,069 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:23:31,069 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:23:31,073 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:23:31,097 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-04-02 14:23:31,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:23:31,191 INFO L262 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 24 conjunts are in the unsatisfiable core [2023-04-02 14:23:31,192 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:23:31,502 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 175 proven. 55 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2023-04-02 14:23:31,502 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:23:31,699 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 175 proven. 55 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2023-04-02 14:23:31,699 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [626497122] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:23:31,699 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [989699552] [2023-04-02 14:23:31,700 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:23:31,700 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:23:31,701 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:23:31,701 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:23:31,701 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:23:31,724 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:23:31,908 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:23:31,929 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:23:31,932 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:23:32,692 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9874#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:23:32,692 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:23:32,692 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:23:32,692 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25, 24] total 38 [2023-04-02 14:23:32,692 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227169643] [2023-04-02 14:23:32,692 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:23:32,693 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2023-04-02 14:23:32,693 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:23:32,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2023-04-02 14:23:32,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=381, Invalid=2169, Unknown=0, NotChecked=0, Total=2550 [2023-04-02 14:23:32,694 INFO L87 Difference]: Start difference. First operand 95 states and 96 transitions. Second operand has 38 states, 38 states have (on average 1.868421052631579) internal successors, (71), 38 states have internal predecessors, (71), 23 states have call successors, (24), 3 states have call predecessors, (24), 2 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2023-04-02 14:23:33,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:23:33,010 INFO L93 Difference]: Finished difference Result 180 states and 183 transitions. [2023-04-02 14:23:33,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-04-02 14:23:33,011 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.868421052631579) internal successors, (71), 38 states have internal predecessors, (71), 23 states have call successors, (24), 3 states have call predecessors, (24), 2 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) Word has length 92 [2023-04-02 14:23:33,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:23:33,012 INFO L225 Difference]: With dead ends: 180 [2023-04-02 14:23:33,012 INFO L226 Difference]: Without dead ends: 100 [2023-04-02 14:23:33,013 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 230 SyntacticMatches, 20 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1507 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=596, Invalid=3064, Unknown=0, NotChecked=0, Total=3660 [2023-04-02 14:23:33,014 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 50 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 383 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 14:23:33,014 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 73 Invalid, 383 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 296 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 14:23:33,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2023-04-02 14:23:33,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 96. [2023-04-02 14:23:33,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 71 states have internal predecessors, (72), 13 states have call successors, (13), 13 states have call predecessors, (13), 12 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2023-04-02 14:23:33,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 97 transitions. [2023-04-02 14:23:33,030 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 97 transitions. Word has length 92 [2023-04-02 14:23:33,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:23:33,030 INFO L495 AbstractCegarLoop]: Abstraction has 96 states and 97 transitions. [2023-04-02 14:23:33,030 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.868421052631579) internal successors, (71), 38 states have internal predecessors, (71), 23 states have call successors, (24), 3 states have call predecessors, (24), 2 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2023-04-02 14:23:33,030 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 97 transitions. [2023-04-02 14:23:33,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2023-04-02 14:23:33,032 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:23:33,032 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:23:33,043 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2023-04-02 14:23:33,238 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-04-02 14:23:33,238 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:23:33,239 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:23:33,239 INFO L85 PathProgramCache]: Analyzing trace with hash -1068232935, now seen corresponding path program 17 times [2023-04-02 14:23:33,239 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:23:33,239 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1780235878] [2023-04-02 14:23:33,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:23:33,239 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:23:33,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:23:33,999 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 20 proven. 221 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2023-04-02 14:23:34,000 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:23:34,000 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1780235878] [2023-04-02 14:23:34,000 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1780235878] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:23:34,000 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1126701821] [2023-04-02 14:23:34,000 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:23:34,000 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:23:34,000 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:23:34,001 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:23:34,015 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-04-02 14:23:34,335 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2023-04-02 14:23:34,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:23:34,338 INFO L262 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 83 conjunts are in the unsatisfiable core [2023-04-02 14:23:34,340 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:23:34,589 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-04-02 14:23:35,769 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 12 proven. 256 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2023-04-02 14:23:35,769 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:23:35,882 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2023-04-02 14:23:35,886 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-04-02 14:23:35,928 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 20 proven. 221 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2023-04-02 14:23:35,928 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1126701821] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:23:35,928 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1641302211] [2023-04-02 14:23:35,929 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:23:35,929 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:23:35,929 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:23:35,930 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:23:35,930 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:23:35,944 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:23:36,123 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:23:36,137 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:23:36,139 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:23:37,169 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10927#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:23:37,169 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:23:37,169 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:23:37,169 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 31, 28] total 55 [2023-04-02 14:23:37,169 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003635805] [2023-04-02 14:23:37,169 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:23:37,170 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2023-04-02 14:23:37,170 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:23:37,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2023-04-02 14:23:37,172 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=4357, Unknown=0, NotChecked=0, Total=4556 [2023-04-02 14:23:37,172 INFO L87 Difference]: Start difference. First operand 96 states and 97 transitions. Second operand has 55 states, 53 states have (on average 1.5849056603773586) internal successors, (84), 53 states have internal predecessors, (84), 23 states have call successors, (25), 4 states have call predecessors, (25), 3 states have return successors, (22), 21 states have call predecessors, (22), 21 states have call successors, (22) [2023-04-02 14:23:38,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:23:38,396 INFO L93 Difference]: Finished difference Result 106 states and 107 transitions. [2023-04-02 14:23:38,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2023-04-02 14:23:38,396 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 53 states have (on average 1.5849056603773586) internal successors, (84), 53 states have internal predecessors, (84), 23 states have call successors, (25), 4 states have call predecessors, (25), 3 states have return successors, (22), 21 states have call predecessors, (22), 21 states have call successors, (22) Word has length 93 [2023-04-02 14:23:38,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:23:38,397 INFO L225 Difference]: With dead ends: 106 [2023-04-02 14:23:38,397 INFO L226 Difference]: Without dead ends: 104 [2023-04-02 14:23:38,397 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 321 GetRequests, 217 SyntacticMatches, 23 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1697 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=317, Invalid=6489, Unknown=0, NotChecked=0, Total=6806 [2023-04-02 14:23:38,398 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 17 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 2385 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 2404 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 2385 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-04-02 14:23:38,398 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 288 Invalid, 2404 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 2385 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-04-02 14:23:38,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2023-04-02 14:23:38,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2023-04-02 14:23:38,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 75 states have (on average 1.0266666666666666) internal successors, (77), 76 states have internal predecessors, (77), 14 states have call successors, (14), 14 states have call predecessors, (14), 13 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2023-04-02 14:23:38,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 104 transitions. [2023-04-02 14:23:38,416 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 104 transitions. Word has length 93 [2023-04-02 14:23:38,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:23:38,416 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 104 transitions. [2023-04-02 14:23:38,417 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 53 states have (on average 1.5849056603773586) internal successors, (84), 53 states have internal predecessors, (84), 23 states have call successors, (25), 4 states have call predecessors, (25), 3 states have return successors, (22), 21 states have call predecessors, (22), 21 states have call successors, (22) [2023-04-02 14:23:38,417 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 104 transitions. [2023-04-02 14:23:38,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2023-04-02 14:23:38,418 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:23:38,418 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:23:38,428 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2023-04-02 14:23:38,624 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:23:38,625 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:23:38,625 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:23:38,625 INFO L85 PathProgramCache]: Analyzing trace with hash 323376793, now seen corresponding path program 18 times [2023-04-02 14:23:38,625 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:23:38,625 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1697314228] [2023-04-02 14:23:38,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:23:38,625 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:23:38,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:23:39,024 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 178 proven. 97 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2023-04-02 14:23:39,024 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:23:39,024 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1697314228] [2023-04-02 14:23:39,024 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1697314228] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:23:39,024 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [634747239] [2023-04-02 14:23:39,024 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:23:39,025 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:23:39,025 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:23:39,026 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:23:39,044 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-04-02 14:23:39,264 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:23:39,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:23:39,267 INFO L262 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 26 conjunts are in the unsatisfiable core [2023-04-02 14:23:39,269 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:23:39,648 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 209 proven. 66 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2023-04-02 14:23:39,648 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:23:39,911 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 209 proven. 66 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2023-04-02 14:23:39,911 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [634747239] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:23:39,911 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [842088269] [2023-04-02 14:23:39,912 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:23:39,912 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:23:39,912 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:23:39,913 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:23:39,913 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:23:39,924 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:23:40,087 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:23:40,106 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:23:40,109 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:23:40,867 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11921#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:23:40,867 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:23:40,867 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:23:40,867 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 27, 26] total 41 [2023-04-02 14:23:40,867 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598790519] [2023-04-02 14:23:40,867 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:23:40,868 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2023-04-02 14:23:40,868 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:23:40,868 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2023-04-02 14:23:40,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=2427, Unknown=0, NotChecked=0, Total=2862 [2023-04-02 14:23:40,869 INFO L87 Difference]: Start difference. First operand 103 states and 104 transitions. Second operand has 41 states, 41 states have (on average 1.853658536585366) internal successors, (76), 41 states have internal predecessors, (76), 25 states have call successors, (26), 3 states have call predecessors, (26), 2 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2023-04-02 14:23:41,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:23:41,209 INFO L93 Difference]: Finished difference Result 195 states and 198 transitions. [2023-04-02 14:23:41,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-04-02 14:23:41,209 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.853658536585366) internal successors, (76), 41 states have internal predecessors, (76), 25 states have call successors, (26), 3 states have call predecessors, (26), 2 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) Word has length 100 [2023-04-02 14:23:41,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:23:41,210 INFO L225 Difference]: With dead ends: 195 [2023-04-02 14:23:41,210 INFO L226 Difference]: Without dead ends: 108 [2023-04-02 14:23:41,211 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 251 SyntacticMatches, 22 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1718 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=688, Invalid=3472, Unknown=0, NotChecked=0, Total=4160 [2023-04-02 14:23:41,211 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 44 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 340 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 414 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 340 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 14:23:41,211 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 74 Invalid, 414 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 340 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 14:23:41,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2023-04-02 14:23:41,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 104. [2023-04-02 14:23:41,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 76 states have (on average 1.0263157894736843) internal successors, (78), 77 states have internal predecessors, (78), 14 states have call successors, (14), 14 states have call predecessors, (14), 13 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2023-04-02 14:23:41,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 105 transitions. [2023-04-02 14:23:41,226 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 105 transitions. Word has length 100 [2023-04-02 14:23:41,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:23:41,226 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 105 transitions. [2023-04-02 14:23:41,226 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.853658536585366) internal successors, (76), 41 states have internal predecessors, (76), 25 states have call successors, (26), 3 states have call predecessors, (26), 2 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2023-04-02 14:23:41,226 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 105 transitions. [2023-04-02 14:23:41,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2023-04-02 14:23:41,227 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:23:41,227 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:23:41,232 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2023-04-02 14:23:41,427 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:23:41,427 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:23:41,428 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:23:41,428 INFO L85 PathProgramCache]: Analyzing trace with hash 1720626584, now seen corresponding path program 19 times [2023-04-02 14:23:41,428 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:23:41,428 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1937182413] [2023-04-02 14:23:41,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:23:41,428 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:23:41,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:23:42,265 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 22 proven. 265 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2023-04-02 14:23:42,265 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:23:42,265 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1937182413] [2023-04-02 14:23:42,265 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1937182413] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:23:42,265 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1599953738] [2023-04-02 14:23:42,265 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:23:42,265 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:23:42,265 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:23:42,266 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:23:42,268 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-04-02 14:23:42,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:23:42,356 INFO L262 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 62 conjunts are in the unsatisfiable core [2023-04-02 14:23:42,358 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:23:42,674 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 14:23:44,237 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 0 proven. 287 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2023-04-02 14:23:44,237 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:23:44,353 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2023-04-02 14:23:44,354 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-04-02 14:23:44,391 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 22 proven. 265 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2023-04-02 14:23:44,391 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1599953738] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:23:44,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [795230381] [2023-04-02 14:23:44,392 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:23:44,392 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:23:44,392 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:23:44,392 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:23:44,393 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:23:44,404 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:23:44,555 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:23:44,575 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:23:44,578 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:23:45,702 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13063#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:23:45,703 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:23:45,703 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:23:45,703 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 31, 30] total 60 [2023-04-02 14:23:45,703 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923781325] [2023-04-02 14:23:45,703 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:23:45,704 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2023-04-02 14:23:45,704 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:23:45,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2023-04-02 14:23:45,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=5029, Unknown=0, NotChecked=0, Total=5256 [2023-04-02 14:23:45,707 INFO L87 Difference]: Start difference. First operand 104 states and 105 transitions. Second operand has 60 states, 58 states have (on average 1.5517241379310345) internal successors, (90), 58 states have internal predecessors, (90), 26 states have call successors, (27), 4 states have call predecessors, (27), 2 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2023-04-02 14:23:46,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:23:46,710 INFO L93 Difference]: Finished difference Result 114 states and 115 transitions. [2023-04-02 14:23:46,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2023-04-02 14:23:46,710 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 58 states have (on average 1.5517241379310345) internal successors, (90), 58 states have internal predecessors, (90), 26 states have call successors, (27), 4 states have call predecessors, (27), 2 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) Word has length 101 [2023-04-02 14:23:46,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:23:46,711 INFO L225 Difference]: With dead ends: 114 [2023-04-02 14:23:46,711 INFO L226 Difference]: Without dead ends: 112 [2023-04-02 14:23:46,712 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 238 SyntacticMatches, 23 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1524 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=254, Invalid=5598, Unknown=0, NotChecked=0, Total=5852 [2023-04-02 14:23:46,712 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 21 mSDsluCounter, 386 mSDsCounter, 0 mSdLazyCounter, 2712 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 409 SdHoareTripleChecker+Invalid, 2726 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 2712 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-04-02 14:23:46,713 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 409 Invalid, 2726 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 2712 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-04-02 14:23:46,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2023-04-02 14:23:46,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2023-04-02 14:23:46,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 81 states have (on average 1.0246913580246915) internal successors, (83), 82 states have internal predecessors, (83), 15 states have call successors, (15), 15 states have call predecessors, (15), 14 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2023-04-02 14:23:46,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 112 transitions. [2023-04-02 14:23:46,729 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 112 transitions. Word has length 101 [2023-04-02 14:23:46,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:23:46,729 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 112 transitions. [2023-04-02 14:23:46,729 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 58 states have (on average 1.5517241379310345) internal successors, (90), 58 states have internal predecessors, (90), 26 states have call successors, (27), 4 states have call predecessors, (27), 2 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2023-04-02 14:23:46,729 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 112 transitions. [2023-04-02 14:23:46,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2023-04-02 14:23:46,730 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:23:46,730 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:23:46,735 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2023-04-02 14:23:46,932 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2023-04-02 14:23:46,932 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:23:46,932 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:23:46,932 INFO L85 PathProgramCache]: Analyzing trace with hash 1513306938, now seen corresponding path program 20 times [2023-04-02 14:23:46,932 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:23:46,933 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1840464030] [2023-04-02 14:23:46,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:23:46,933 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:23:46,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:23:47,454 INFO L134 CoverageAnalysis]: Checked inductivity of 588 backedges. 212 proven. 112 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2023-04-02 14:23:47,455 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:23:47,455 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1840464030] [2023-04-02 14:23:47,455 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1840464030] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:23:47,455 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47246426] [2023-04-02 14:23:47,455 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:23:47,455 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:23:47,455 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:23:47,456 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:23:47,482 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-04-02 14:23:48,286 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2023-04-02 14:23:48,286 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:23:48,289 INFO L262 TraceCheckSpWp]: Trace formula consists of 360 conjuncts, 28 conjunts are in the unsatisfiable core [2023-04-02 14:23:48,291 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:23:48,659 INFO L134 CoverageAnalysis]: Checked inductivity of 588 backedges. 246 proven. 78 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2023-04-02 14:23:48,660 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:23:48,940 INFO L134 CoverageAnalysis]: Checked inductivity of 588 backedges. 246 proven. 78 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2023-04-02 14:23:48,940 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47246426] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:23:48,940 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1382361608] [2023-04-02 14:23:48,941 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:23:48,941 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:23:48,941 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:23:48,942 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:23:48,942 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:23:48,958 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:23:49,125 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:23:49,138 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:23:49,140 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:23:49,886 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14110#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:23:49,886 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:23:49,887 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:23:49,887 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29, 28] total 44 [2023-04-02 14:23:49,887 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969023142] [2023-04-02 14:23:49,887 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:23:49,887 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2023-04-02 14:23:49,887 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:23:49,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2023-04-02 14:23:49,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=493, Invalid=2699, Unknown=0, NotChecked=0, Total=3192 [2023-04-02 14:23:49,888 INFO L87 Difference]: Start difference. First operand 111 states and 112 transitions. Second operand has 44 states, 44 states have (on average 1.8409090909090908) internal successors, (81), 44 states have internal predecessors, (81), 27 states have call successors, (28), 3 states have call predecessors, (28), 2 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2023-04-02 14:23:50,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:23:50,252 INFO L93 Difference]: Finished difference Result 210 states and 213 transitions. [2023-04-02 14:23:50,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2023-04-02 14:23:50,254 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.8409090909090908) internal successors, (81), 44 states have internal predecessors, (81), 27 states have call successors, (28), 3 states have call predecessors, (28), 2 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) Word has length 108 [2023-04-02 14:23:50,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:23:50,255 INFO L225 Difference]: With dead ends: 210 [2023-04-02 14:23:50,255 INFO L226 Difference]: Without dead ends: 116 [2023-04-02 14:23:50,256 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 272 SyntacticMatches, 24 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1942 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=787, Invalid=3905, Unknown=0, NotChecked=0, Total=4692 [2023-04-02 14:23:50,256 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 61 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 449 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 556 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 449 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 14:23:50,256 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 93 Invalid, 556 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 449 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 14:23:50,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2023-04-02 14:23:50,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 112. [2023-04-02 14:23:50,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 82 states have (on average 1.024390243902439) internal successors, (84), 83 states have internal predecessors, (84), 15 states have call successors, (15), 15 states have call predecessors, (15), 14 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2023-04-02 14:23:50,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2023-04-02 14:23:50,277 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 108 [2023-04-02 14:23:50,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:23:50,277 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2023-04-02 14:23:50,277 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.8409090909090908) internal successors, (81), 44 states have internal predecessors, (81), 27 states have call successors, (28), 3 states have call predecessors, (28), 2 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2023-04-02 14:23:50,277 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2023-04-02 14:23:50,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2023-04-02 14:23:50,278 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:23:50,278 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:23:50,289 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2023-04-02 14:23:50,487 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-04-02 14:23:50,487 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:23:50,487 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:23:50,487 INFO L85 PathProgramCache]: Analyzing trace with hash -1829756103, now seen corresponding path program 21 times [2023-04-02 14:23:50,487 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:23:50,488 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1935838908] [2023-04-02 14:23:50,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:23:50,488 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:23:50,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:23:51,651 INFO L134 CoverageAnalysis]: Checked inductivity of 601 backedges. 24 proven. 313 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2023-04-02 14:23:51,652 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:23:51,652 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1935838908] [2023-04-02 14:23:51,652 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1935838908] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:23:51,652 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [10493320] [2023-04-02 14:23:51,652 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:23:51,652 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:23:51,652 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:23:51,653 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:23:51,676 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-04-02 14:23:51,882 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:23:51,882 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:23:51,885 INFO L262 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 69 conjunts are in the unsatisfiable core [2023-04-02 14:23:51,888 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:23:52,177 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-04-02 14:23:53,646 INFO L134 CoverageAnalysis]: Checked inductivity of 601 backedges. 0 proven. 370 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2023-04-02 14:23:53,646 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:23:54,131 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2023-04-02 14:23:54,134 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-04-02 14:23:54,154 INFO L134 CoverageAnalysis]: Checked inductivity of 601 backedges. 24 proven. 313 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2023-04-02 14:23:54,155 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [10493320] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:23:54,155 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1941645143] [2023-04-02 14:23:54,156 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:23:54,156 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:23:54,156 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:23:54,156 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:23:54,156 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:23:54,169 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:23:54,347 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:23:54,369 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:23:54,372 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:23:55,435 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15354#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:23:55,435 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:23:55,435 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:23:55,435 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 35, 32] total 78 [2023-04-02 14:23:55,435 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350343482] [2023-04-02 14:23:55,436 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:23:55,436 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2023-04-02 14:23:55,436 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:23:55,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2023-04-02 14:23:55,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=7869, Unknown=0, NotChecked=0, Total=8190 [2023-04-02 14:23:55,438 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand has 78 states, 76 states have (on average 1.605263157894737) internal successors, (122), 76 states have internal predecessors, (122), 39 states have call successors, (40), 4 states have call predecessors, (40), 3 states have return successors, (37), 37 states have call predecessors, (37), 37 states have call successors, (37) [2023-04-02 14:23:57,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:23:57,318 INFO L93 Difference]: Finished difference Result 122 states and 123 transitions. [2023-04-02 14:23:57,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2023-04-02 14:23:57,319 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 76 states have (on average 1.605263157894737) internal successors, (122), 76 states have internal predecessors, (122), 39 states have call successors, (40), 4 states have call predecessors, (40), 3 states have return successors, (37), 37 states have call predecessors, (37), 37 states have call successors, (37) Word has length 109 [2023-04-02 14:23:57,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:23:57,319 INFO L225 Difference]: With dead ends: 122 [2023-04-02 14:23:57,319 INFO L226 Difference]: Without dead ends: 120 [2023-04-02 14:23:57,320 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 375 GetRequests, 246 SyntacticMatches, 23 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4245 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=482, Invalid=11074, Unknown=0, NotChecked=0, Total=11556 [2023-04-02 14:23:57,321 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 18 mSDsluCounter, 394 mSDsCounter, 0 mSdLazyCounter, 3610 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 416 SdHoareTripleChecker+Invalid, 3633 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 3610 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2023-04-02 14:23:57,321 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 416 Invalid, 3633 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 3610 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2023-04-02 14:23:57,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2023-04-02 14:23:57,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2023-04-02 14:23:57,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 87 states have (on average 1.0229885057471264) internal successors, (89), 88 states have internal predecessors, (89), 16 states have call successors, (16), 16 states have call predecessors, (16), 15 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2023-04-02 14:23:57,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 120 transitions. [2023-04-02 14:23:57,340 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 120 transitions. Word has length 109 [2023-04-02 14:23:57,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:23:57,341 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 120 transitions. [2023-04-02 14:23:57,341 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 76 states have (on average 1.605263157894737) internal successors, (122), 76 states have internal predecessors, (122), 39 states have call successors, (40), 4 states have call predecessors, (40), 3 states have return successors, (37), 37 states have call predecessors, (37), 37 states have call successors, (37) [2023-04-02 14:23:57,341 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 120 transitions. [2023-04-02 14:23:57,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2023-04-02 14:23:57,342 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:23:57,342 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:23:57,349 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2023-04-02 14:23:57,548 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:23:57,549 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:23:57,549 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:23:57,549 INFO L85 PathProgramCache]: Analyzing trace with hash -321823111, now seen corresponding path program 22 times [2023-04-02 14:23:57,549 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:23:57,549 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [451995837] [2023-04-02 14:23:57,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:23:57,549 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:23:57,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:23:58,068 INFO L134 CoverageAnalysis]: Checked inductivity of 689 backedges. 249 proven. 128 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2023-04-02 14:23:58,068 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:23:58,068 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [451995837] [2023-04-02 14:23:58,068 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [451995837] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:23:58,068 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1800952619] [2023-04-02 14:23:58,068 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:23:58,068 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:23:58,069 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:23:58,074 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:23:58,096 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-04-02 14:23:58,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:23:58,198 INFO L262 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 30 conjunts are in the unsatisfiable core [2023-04-02 14:23:58,201 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:23:58,658 INFO L134 CoverageAnalysis]: Checked inductivity of 689 backedges. 286 proven. 91 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2023-04-02 14:23:58,658 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:23:58,952 INFO L134 CoverageAnalysis]: Checked inductivity of 689 backedges. 286 proven. 91 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2023-04-02 14:23:58,952 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1800952619] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:23:58,952 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [869034882] [2023-04-02 14:23:58,953 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:23:58,954 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:23:58,954 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:23:58,954 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:23:58,954 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:23:59,003 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:23:59,150 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:23:59,172 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:23:59,175 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:23:59,952 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16502#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:23:59,953 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:23:59,953 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:23:59,953 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 31, 30] total 47 [2023-04-02 14:23:59,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873985206] [2023-04-02 14:23:59,953 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:23:59,953 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2023-04-02 14:23:59,953 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:23:59,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2023-04-02 14:23:59,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=555, Invalid=2985, Unknown=0, NotChecked=0, Total=3540 [2023-04-02 14:23:59,954 INFO L87 Difference]: Start difference. First operand 119 states and 120 transitions. Second operand has 47 states, 47 states have (on average 1.8297872340425532) internal successors, (86), 47 states have internal predecessors, (86), 29 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (28), 28 states have call predecessors, (28), 28 states have call successors, (28) [2023-04-02 14:24:00,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:24:00,341 INFO L93 Difference]: Finished difference Result 225 states and 228 transitions. [2023-04-02 14:24:00,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2023-04-02 14:24:00,342 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.8297872340425532) internal successors, (86), 47 states have internal predecessors, (86), 29 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (28), 28 states have call predecessors, (28), 28 states have call successors, (28) Word has length 116 [2023-04-02 14:24:00,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:24:00,342 INFO L225 Difference]: With dead ends: 225 [2023-04-02 14:24:00,342 INFO L226 Difference]: Without dead ends: 124 [2023-04-02 14:24:00,343 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 390 GetRequests, 293 SyntacticMatches, 26 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2179 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=893, Invalid=4363, Unknown=0, NotChecked=0, Total=5256 [2023-04-02 14:24:00,344 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 89 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 347 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 509 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 347 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 14:24:00,344 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 67 Invalid, 509 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 347 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 14:24:00,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2023-04-02 14:24:00,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 120. [2023-04-02 14:24:00,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 88 states have (on average 1.0227272727272727) internal successors, (90), 89 states have internal predecessors, (90), 16 states have call successors, (16), 16 states have call predecessors, (16), 15 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2023-04-02 14:24:00,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 121 transitions. [2023-04-02 14:24:00,363 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 121 transitions. Word has length 116 [2023-04-02 14:24:00,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:24:00,363 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 121 transitions. [2023-04-02 14:24:00,364 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.8297872340425532) internal successors, (86), 47 states have internal predecessors, (86), 29 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (28), 28 states have call predecessors, (28), 28 states have call successors, (28) [2023-04-02 14:24:00,364 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 121 transitions. [2023-04-02 14:24:00,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2023-04-02 14:24:00,364 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:24:00,365 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:24:00,373 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2023-04-02 14:24:00,571 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:24:00,571 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:24:00,571 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:24:00,571 INFO L85 PathProgramCache]: Analyzing trace with hash 434231160, now seen corresponding path program 23 times [2023-04-02 14:24:00,571 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:24:00,572 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1201298026] [2023-04-02 14:24:00,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:24:00,572 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:24:00,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:24:01,518 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 26 proven. 365 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2023-04-02 14:24:01,518 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:24:01,518 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1201298026] [2023-04-02 14:24:01,518 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1201298026] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:24:01,518 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [498370534] [2023-04-02 14:24:01,518 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:24:01,519 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:24:01,519 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:24:01,521 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:24:01,522 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-04-02 14:24:02,163 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2023-04-02 14:24:02,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:24:02,168 INFO L262 TraceCheckSpWp]: Trace formula consists of 392 conjuncts, 73 conjunts are in the unsatisfiable core [2023-04-02 14:24:02,170 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:24:02,200 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-04-02 14:24:03,760 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 30 proven. 397 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2023-04-02 14:24:03,761 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:24:03,917 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2023-04-02 14:24:03,919 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-04-02 14:24:03,968 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 26 proven. 365 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2023-04-02 14:24:03,968 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [498370534] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:24:03,968 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1066188877] [2023-04-02 14:24:03,969 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:24:03,969 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:24:03,969 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:24:03,970 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:24:03,970 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:24:03,986 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:24:04,151 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:24:04,171 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:24:04,174 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:24:05,271 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17806#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:24:05,271 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:24:05,271 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:24:05,271 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 37, 34] total 54 [2023-04-02 14:24:05,271 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834908012] [2023-04-02 14:24:05,271 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:24:05,272 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2023-04-02 14:24:05,272 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:24:05,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2023-04-02 14:24:05,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=4226, Unknown=0, NotChecked=0, Total=4422 [2023-04-02 14:24:05,273 INFO L87 Difference]: Start difference. First operand 120 states and 121 transitions. Second operand has 54 states, 52 states have (on average 1.6923076923076923) internal successors, (88), 52 states have internal predecessors, (88), 29 states have call successors, (31), 4 states have call predecessors, (31), 3 states have return successors, (28), 27 states have call predecessors, (28), 27 states have call successors, (28) [2023-04-02 14:24:06,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:24:06,726 INFO L93 Difference]: Finished difference Result 130 states and 131 transitions. [2023-04-02 14:24:06,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2023-04-02 14:24:06,726 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 52 states have (on average 1.6923076923076923) internal successors, (88), 52 states have internal predecessors, (88), 29 states have call successors, (31), 4 states have call predecessors, (31), 3 states have return successors, (28), 27 states have call predecessors, (28), 27 states have call successors, (28) Word has length 117 [2023-04-02 14:24:06,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:24:06,727 INFO L225 Difference]: With dead ends: 130 [2023-04-02 14:24:06,727 INFO L226 Difference]: Without dead ends: 128 [2023-04-02 14:24:06,728 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 290 SyntacticMatches, 29 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1322 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=338, Invalid=6802, Unknown=0, NotChecked=0, Total=7140 [2023-04-02 14:24:06,728 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 22 mSDsluCounter, 301 mSDsCounter, 0 mSdLazyCounter, 3085 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 324 SdHoareTripleChecker+Invalid, 3110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 3085 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:24:06,729 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 324 Invalid, 3110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 3085 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-04-02 14:24:06,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2023-04-02 14:24:06,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2023-04-02 14:24:06,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 93 states have (on average 1.021505376344086) internal successors, (95), 94 states have internal predecessors, (95), 17 states have call successors, (17), 17 states have call predecessors, (17), 16 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2023-04-02 14:24:06,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2023-04-02 14:24:06,751 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 117 [2023-04-02 14:24:06,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:24:06,751 INFO L495 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2023-04-02 14:24:06,751 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 52 states have (on average 1.6923076923076923) internal successors, (88), 52 states have internal predecessors, (88), 29 states have call successors, (31), 4 states have call predecessors, (31), 3 states have return successors, (28), 27 states have call predecessors, (28), 27 states have call successors, (28) [2023-04-02 14:24:06,751 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2023-04-02 14:24:06,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2023-04-02 14:24:06,752 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:24:06,752 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 15, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:24:06,758 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2023-04-02 14:24:06,952 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-04-02 14:24:06,953 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:24:06,953 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:24:06,953 INFO L85 PathProgramCache]: Analyzing trace with hash -927517350, now seen corresponding path program 24 times [2023-04-02 14:24:06,953 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:24:06,953 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [335813054] [2023-04-02 14:24:06,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:24:06,953 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:24:06,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:24:07,467 INFO L134 CoverageAnalysis]: Checked inductivity of 798 backedges. 289 proven. 145 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2023-04-02 14:24:07,467 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:24:07,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [335813054] [2023-04-02 14:24:07,467 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [335813054] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:24:07,468 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353157422] [2023-04-02 14:24:07,468 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:24:07,468 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:24:07,468 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:24:07,469 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:24:07,471 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-04-02 14:24:07,716 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:24:07,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:24:07,719 INFO L262 TraceCheckSpWp]: Trace formula consists of 406 conjuncts, 32 conjunts are in the unsatisfiable core [2023-04-02 14:24:07,721 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:24:08,269 INFO L134 CoverageAnalysis]: Checked inductivity of 798 backedges. 329 proven. 105 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2023-04-02 14:24:08,269 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:24:08,588 INFO L134 CoverageAnalysis]: Checked inductivity of 798 backedges. 329 proven. 105 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2023-04-02 14:24:08,588 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353157422] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:24:08,588 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1125262686] [2023-04-02 14:24:08,589 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:24:08,589 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:24:08,589 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:24:08,589 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:24:08,590 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:24:08,605 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:24:08,792 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:24:08,812 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:24:08,815 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:24:09,629 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19031#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:24:09,629 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:24:09,629 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:24:09,629 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 33, 32] total 50 [2023-04-02 14:24:09,629 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662889996] [2023-04-02 14:24:09,629 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:24:09,630 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2023-04-02 14:24:09,630 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:24:09,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2023-04-02 14:24:09,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=621, Invalid=3285, Unknown=0, NotChecked=0, Total=3906 [2023-04-02 14:24:09,631 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand has 50 states, 50 states have (on average 1.82) internal successors, (91), 50 states have internal predecessors, (91), 31 states have call successors, (32), 3 states have call predecessors, (32), 2 states have return successors, (30), 30 states have call predecessors, (30), 30 states have call successors, (30) [2023-04-02 14:24:10,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:24:10,063 INFO L93 Difference]: Finished difference Result 240 states and 243 transitions. [2023-04-02 14:24:10,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-04-02 14:24:10,064 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.82) internal successors, (91), 50 states have internal predecessors, (91), 31 states have call successors, (32), 3 states have call predecessors, (32), 2 states have return successors, (30), 30 states have call predecessors, (30), 30 states have call successors, (30) Word has length 124 [2023-04-02 14:24:10,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:24:10,065 INFO L225 Difference]: With dead ends: 240 [2023-04-02 14:24:10,065 INFO L226 Difference]: Without dead ends: 132 [2023-04-02 14:24:10,066 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 314 SyntacticMatches, 28 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2429 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1006, Invalid=4846, Unknown=0, NotChecked=0, Total=5852 [2023-04-02 14:24:10,066 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 102 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 463 mSolverCounterSat, 187 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 650 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 187 IncrementalHoareTripleChecker+Valid, 463 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 14:24:10,066 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [117 Valid, 77 Invalid, 650 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [187 Valid, 463 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 14:24:10,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2023-04-02 14:24:10,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 128. [2023-04-02 14:24:10,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 94 states have (on average 1.0212765957446808) internal successors, (96), 95 states have internal predecessors, (96), 17 states have call successors, (17), 17 states have call predecessors, (17), 16 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2023-04-02 14:24:10,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 129 transitions. [2023-04-02 14:24:10,096 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 129 transitions. Word has length 124 [2023-04-02 14:24:10,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:24:10,096 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 129 transitions. [2023-04-02 14:24:10,096 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.82) internal successors, (91), 50 states have internal predecessors, (91), 31 states have call successors, (32), 3 states have call predecessors, (32), 2 states have return successors, (30), 30 states have call predecessors, (30), 30 states have call successors, (30) [2023-04-02 14:24:10,096 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 129 transitions. [2023-04-02 14:24:10,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2023-04-02 14:24:10,097 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:24:10,097 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:24:10,104 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2023-04-02 14:24:10,303 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2023-04-02 14:24:10,304 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:24:10,304 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:24:10,304 INFO L85 PathProgramCache]: Analyzing trace with hash -1443217575, now seen corresponding path program 25 times [2023-04-02 14:24:10,304 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:24:10,304 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [34224333] [2023-04-02 14:24:10,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:24:10,305 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:24:10,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:24:11,422 INFO L134 CoverageAnalysis]: Checked inductivity of 813 backedges. 28 proven. 421 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2023-04-02 14:24:11,422 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:24:11,422 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [34224333] [2023-04-02 14:24:11,422 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [34224333] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:24:11,422 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [283131027] [2023-04-02 14:24:11,422 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:24:11,422 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:24:11,423 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:24:11,428 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:24:11,430 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2023-04-02 14:24:11,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:24:11,538 INFO L262 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 74 conjunts are in the unsatisfiable core [2023-04-02 14:24:11,540 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:24:12,000 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 14:24:14,127 INFO L134 CoverageAnalysis]: Checked inductivity of 813 backedges. 0 proven. 449 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2023-04-02 14:24:14,127 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:24:14,273 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2023-04-02 14:24:14,274 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-04-02 14:24:14,317 INFO L134 CoverageAnalysis]: Checked inductivity of 813 backedges. 28 proven. 421 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2023-04-02 14:24:14,318 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [283131027] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:24:14,318 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2084535674] [2023-04-02 14:24:14,319 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:24:14,319 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:24:14,319 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:24:14,319 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:24:14,319 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:24:14,335 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:24:14,505 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:24:14,527 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:24:14,530 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:24:15,788 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20437#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:24:15,789 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:24:15,789 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:24:15,789 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 37, 36] total 72 [2023-04-02 14:24:15,789 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916564042] [2023-04-02 14:24:15,789 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:24:15,789 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2023-04-02 14:24:15,789 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:24:15,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2023-04-02 14:24:15,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=6874, Unknown=0, NotChecked=0, Total=7140 [2023-04-02 14:24:15,791 INFO L87 Difference]: Start difference. First operand 128 states and 129 transitions. Second operand has 72 states, 70 states have (on average 1.542857142857143) internal successors, (108), 70 states have internal predecessors, (108), 32 states have call successors, (33), 4 states have call predecessors, (33), 2 states have return successors, (30), 30 states have call predecessors, (30), 30 states have call successors, (30) [2023-04-02 14:24:17,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:24:17,351 INFO L93 Difference]: Finished difference Result 138 states and 139 transitions. [2023-04-02 14:24:17,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2023-04-02 14:24:17,353 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 70 states have (on average 1.542857142857143) internal successors, (108), 70 states have internal predecessors, (108), 32 states have call successors, (33), 4 states have call predecessors, (33), 2 states have return successors, (30), 30 states have call predecessors, (30), 30 states have call successors, (30) Word has length 125 [2023-04-02 14:24:17,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:24:17,354 INFO L225 Difference]: With dead ends: 138 [2023-04-02 14:24:17,354 INFO L226 Difference]: Without dead ends: 136 [2023-04-02 14:24:17,354 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 414 GetRequests, 298 SyntacticMatches, 29 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2109 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=293, Invalid=7539, Unknown=0, NotChecked=0, Total=7832 [2023-04-02 14:24:17,355 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 21 mSDsluCounter, 501 mSDsCounter, 0 mSdLazyCounter, 4121 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 527 SdHoareTripleChecker+Invalid, 4131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 4121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2023-04-02 14:24:17,355 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 527 Invalid, 4131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 4121 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2023-04-02 14:24:17,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2023-04-02 14:24:17,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 135. [2023-04-02 14:24:17,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 99 states have (on average 1.02020202020202) internal successors, (101), 100 states have internal predecessors, (101), 18 states have call successors, (18), 18 states have call predecessors, (18), 17 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2023-04-02 14:24:17,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 136 transitions. [2023-04-02 14:24:17,376 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 136 transitions. Word has length 125 [2023-04-02 14:24:17,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:24:17,376 INFO L495 AbstractCegarLoop]: Abstraction has 135 states and 136 transitions. [2023-04-02 14:24:17,376 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 70 states have (on average 1.542857142857143) internal successors, (108), 70 states have internal predecessors, (108), 32 states have call successors, (33), 4 states have call predecessors, (33), 2 states have return successors, (30), 30 states have call predecessors, (30), 30 states have call successors, (30) [2023-04-02 14:24:17,376 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 136 transitions. [2023-04-02 14:24:17,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2023-04-02 14:24:17,377 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:24:17,377 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 16, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:24:17,386 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2023-04-02 14:24:17,584 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2023-04-02 14:24:17,584 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:24:17,585 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:24:17,585 INFO L85 PathProgramCache]: Analyzing trace with hash 1402297945, now seen corresponding path program 26 times [2023-04-02 14:24:17,585 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:24:17,585 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [643859156] [2023-04-02 14:24:17,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:24:17,585 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:24:17,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:24:18,156 INFO L134 CoverageAnalysis]: Checked inductivity of 915 backedges. 332 proven. 163 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2023-04-02 14:24:18,156 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:24:18,156 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [643859156] [2023-04-02 14:24:18,156 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [643859156] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:24:18,156 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1405196026] [2023-04-02 14:24:18,156 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:24:18,156 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:24:18,156 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:24:18,157 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:24:18,159 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2023-04-02 14:24:19,067 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2023-04-02 14:24:19,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:24:19,071 INFO L262 TraceCheckSpWp]: Trace formula consists of 429 conjuncts, 34 conjunts are in the unsatisfiable core [2023-04-02 14:24:19,073 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:24:19,607 INFO L134 CoverageAnalysis]: Checked inductivity of 915 backedges. 375 proven. 120 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2023-04-02 14:24:19,607 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:24:19,973 INFO L134 CoverageAnalysis]: Checked inductivity of 915 backedges. 375 proven. 120 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2023-04-02 14:24:19,973 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1405196026] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:24:19,973 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1226468050] [2023-04-02 14:24:19,974 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:24:19,974 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:24:19,974 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:24:19,974 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:24:19,974 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:24:19,985 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:24:20,146 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:24:20,165 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:24:20,168 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:24:21,000 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21709#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:24:21,001 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:24:21,001 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:24:21,001 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 35, 34] total 53 [2023-04-02 14:24:21,001 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317327115] [2023-04-02 14:24:21,001 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:24:21,002 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2023-04-02 14:24:21,002 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:24:21,002 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2023-04-02 14:24:21,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=691, Invalid=3599, Unknown=0, NotChecked=0, Total=4290 [2023-04-02 14:24:21,003 INFO L87 Difference]: Start difference. First operand 135 states and 136 transitions. Second operand has 53 states, 53 states have (on average 1.8113207547169812) internal successors, (96), 53 states have internal predecessors, (96), 33 states have call successors, (34), 3 states have call predecessors, (34), 2 states have return successors, (32), 32 states have call predecessors, (32), 32 states have call successors, (32) [2023-04-02 14:24:21,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:24:21,510 INFO L93 Difference]: Finished difference Result 255 states and 258 transitions. [2023-04-02 14:24:21,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-04-02 14:24:21,511 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.8113207547169812) internal successors, (96), 53 states have internal predecessors, (96), 33 states have call successors, (34), 3 states have call predecessors, (34), 2 states have return successors, (32), 32 states have call predecessors, (32), 32 states have call successors, (32) Word has length 132 [2023-04-02 14:24:21,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:24:21,511 INFO L225 Difference]: With dead ends: 255 [2023-04-02 14:24:21,511 INFO L226 Difference]: Without dead ends: 140 [2023-04-02 14:24:21,512 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 335 SyntacticMatches, 30 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2692 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1126, Invalid=5354, Unknown=0, NotChecked=0, Total=6480 [2023-04-02 14:24:21,512 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 85 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 520 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 672 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 520 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 14:24:21,513 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [101 Valid, 99 Invalid, 672 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 520 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 14:24:21,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2023-04-02 14:24:21,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 136. [2023-04-02 14:24:21,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 100 states have (on average 1.02) internal successors, (102), 101 states have internal predecessors, (102), 18 states have call successors, (18), 18 states have call predecessors, (18), 17 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2023-04-02 14:24:21,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2023-04-02 14:24:21,538 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 132 [2023-04-02 14:24:21,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:24:21,538 INFO L495 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2023-04-02 14:24:21,538 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.8113207547169812) internal successors, (96), 53 states have internal predecessors, (96), 33 states have call successors, (34), 3 states have call predecessors, (34), 2 states have return successors, (32), 32 states have call predecessors, (32), 32 states have call successors, (32) [2023-04-02 14:24:21,538 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2023-04-02 14:24:21,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2023-04-02 14:24:21,539 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:24:21,539 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:24:21,549 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2023-04-02 14:24:21,746 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2023-04-02 14:24:21,747 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:24:21,747 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:24:21,747 INFO L85 PathProgramCache]: Analyzing trace with hash 1508505944, now seen corresponding path program 27 times [2023-04-02 14:24:21,747 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:24:21,747 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1178642205] [2023-04-02 14:24:21,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:24:21,748 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:24:21,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:24:22,905 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 30 proven. 481 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2023-04-02 14:24:22,905 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:24:22,905 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1178642205] [2023-04-02 14:24:22,905 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1178642205] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:24:22,905 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1139020952] [2023-04-02 14:24:22,905 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:24:22,906 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:24:22,906 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:24:22,906 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:24:22,908 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2023-04-02 14:24:23,263 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:24:23,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:24:23,267 INFO L262 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 83 conjunts are in the unsatisfiable core [2023-04-02 14:24:23,270 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:24:23,798 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 14:24:26,301 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 0 proven. 553 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2023-04-02 14:24:26,301 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:24:26,462 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2023-04-02 14:24:26,464 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-04-02 14:24:26,510 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 30 proven. 481 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2023-04-02 14:24:26,511 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1139020952] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:24:26,511 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1262436475] [2023-04-02 14:24:26,512 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:24:26,512 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:24:26,512 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:24:26,512 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:24:26,512 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:24:26,531 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:24:26,711 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:24:26,731 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:24:26,734 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:24:28,068 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23205#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:24:28,069 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:24:28,069 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:24:28,069 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 41, 38] total 78 [2023-04-02 14:24:28,069 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212271332] [2023-04-02 14:24:28,069 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:24:28,070 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2023-04-02 14:24:28,070 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:24:28,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2023-04-02 14:24:28,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=7904, Unknown=0, NotChecked=0, Total=8190 [2023-04-02 14:24:28,071 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand has 78 states, 76 states have (on average 1.5394736842105263) internal successors, (117), 76 states have internal predecessors, (117), 34 states have call successors, (35), 4 states have call predecessors, (35), 3 states have return successors, (32), 32 states have call predecessors, (32), 32 states have call successors, (32) [2023-04-02 14:24:30,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:24:30,337 INFO L93 Difference]: Finished difference Result 146 states and 147 transitions. [2023-04-02 14:24:30,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2023-04-02 14:24:30,337 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 76 states have (on average 1.5394736842105263) internal successors, (117), 76 states have internal predecessors, (117), 34 states have call successors, (35), 4 states have call predecessors, (35), 3 states have return successors, (32), 32 states have call predecessors, (32), 32 states have call successors, (32) Word has length 133 [2023-04-02 14:24:30,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:24:30,338 INFO L225 Difference]: With dead ends: 146 [2023-04-02 14:24:30,338 INFO L226 Difference]: Without dead ends: 144 [2023-04-02 14:24:30,339 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 456 GetRequests, 316 SyntacticMatches, 31 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3281 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=462, Invalid=11748, Unknown=0, NotChecked=0, Total=12210 [2023-04-02 14:24:30,339 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 17 mSDsluCounter, 470 mSDsCounter, 0 mSdLazyCounter, 5191 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 495 SdHoareTripleChecker+Invalid, 5216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 5191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2023-04-02 14:24:30,339 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 495 Invalid, 5216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 5191 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2023-04-02 14:24:30,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2023-04-02 14:24:30,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 143. [2023-04-02 14:24:30,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 105 states have (on average 1.019047619047619) internal successors, (107), 106 states have internal predecessors, (107), 19 states have call successors, (19), 19 states have call predecessors, (19), 18 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2023-04-02 14:24:30,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 144 transitions. [2023-04-02 14:24:30,366 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 144 transitions. Word has length 133 [2023-04-02 14:24:30,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:24:30,366 INFO L495 AbstractCegarLoop]: Abstraction has 143 states and 144 transitions. [2023-04-02 14:24:30,366 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 76 states have (on average 1.5394736842105263) internal successors, (117), 76 states have internal predecessors, (117), 34 states have call successors, (35), 4 states have call predecessors, (35), 3 states have return successors, (32), 32 states have call predecessors, (32), 32 states have call successors, (32) [2023-04-02 14:24:30,366 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 144 transitions. [2023-04-02 14:24:30,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2023-04-02 14:24:30,367 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:24:30,367 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 17, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:24:30,373 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2023-04-02 14:24:30,567 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2023-04-02 14:24:30,568 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:24:30,568 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:24:30,568 INFO L85 PathProgramCache]: Analyzing trace with hash -612419718, now seen corresponding path program 28 times [2023-04-02 14:24:30,568 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:24:30,568 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914542337] [2023-04-02 14:24:30,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:24:30,568 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:24:30,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:24:31,240 INFO L134 CoverageAnalysis]: Checked inductivity of 1040 backedges. 378 proven. 182 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2023-04-02 14:24:31,240 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:24:31,241 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914542337] [2023-04-02 14:24:31,241 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1914542337] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:24:31,241 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621656082] [2023-04-02 14:24:31,241 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:24:31,241 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:24:31,241 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:24:31,242 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:24:31,244 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2023-04-02 14:24:31,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:24:31,367 INFO L262 TraceCheckSpWp]: Trace formula consists of 452 conjuncts, 36 conjunts are in the unsatisfiable core [2023-04-02 14:24:31,370 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:24:31,950 INFO L134 CoverageAnalysis]: Checked inductivity of 1040 backedges. 424 proven. 136 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2023-04-02 14:24:31,950 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:24:32,364 INFO L134 CoverageAnalysis]: Checked inductivity of 1040 backedges. 424 proven. 136 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2023-04-02 14:24:32,365 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [621656082] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:24:32,365 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [808039926] [2023-04-02 14:24:32,365 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:24:32,365 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:24:32,366 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:24:32,366 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:24:32,366 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:24:32,387 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:24:32,528 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:24:32,542 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:24:32,545 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:24:33,407 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24584#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:24:33,408 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:24:33,408 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:24:33,408 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 37, 36] total 56 [2023-04-02 14:24:33,408 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468669616] [2023-04-02 14:24:33,409 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:24:33,409 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2023-04-02 14:24:33,409 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:24:33,410 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2023-04-02 14:24:33,410 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=765, Invalid=3927, Unknown=0, NotChecked=0, Total=4692 [2023-04-02 14:24:33,410 INFO L87 Difference]: Start difference. First operand 143 states and 144 transitions. Second operand has 56 states, 56 states have (on average 1.8035714285714286) internal successors, (101), 56 states have internal predecessors, (101), 35 states have call successors, (36), 3 states have call predecessors, (36), 2 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2023-04-02 14:24:33,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:24:33,978 INFO L93 Difference]: Finished difference Result 270 states and 273 transitions. [2023-04-02 14:24:33,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2023-04-02 14:24:33,980 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.8035714285714286) internal successors, (101), 56 states have internal predecessors, (101), 35 states have call successors, (36), 3 states have call predecessors, (36), 2 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) Word has length 140 [2023-04-02 14:24:33,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:24:33,981 INFO L225 Difference]: With dead ends: 270 [2023-04-02 14:24:33,981 INFO L226 Difference]: Without dead ends: 148 [2023-04-02 14:24:33,982 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 356 SyntacticMatches, 32 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2968 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1253, Invalid=5887, Unknown=0, NotChecked=0, Total=7140 [2023-04-02 14:24:33,982 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 105 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 573 mSolverCounterSat, 191 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 764 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 191 IncrementalHoareTripleChecker+Valid, 573 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 14:24:33,982 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [122 Valid, 70 Invalid, 764 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [191 Valid, 573 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 14:24:33,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2023-04-02 14:24:34,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 144. [2023-04-02 14:24:34,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 106 states have (on average 1.0188679245283019) internal successors, (108), 107 states have internal predecessors, (108), 19 states have call successors, (19), 19 states have call predecessors, (19), 18 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2023-04-02 14:24:34,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 145 transitions. [2023-04-02 14:24:34,010 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 145 transitions. Word has length 140 [2023-04-02 14:24:34,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:24:34,010 INFO L495 AbstractCegarLoop]: Abstraction has 144 states and 145 transitions. [2023-04-02 14:24:34,010 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.8035714285714286) internal successors, (101), 56 states have internal predecessors, (101), 35 states have call successors, (36), 3 states have call predecessors, (36), 2 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2023-04-02 14:24:34,011 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 145 transitions. [2023-04-02 14:24:34,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2023-04-02 14:24:34,011 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:24:34,011 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:24:34,018 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2023-04-02 14:24:34,218 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:24:34,218 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:24:34,218 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:24:34,219 INFO L85 PathProgramCache]: Analyzing trace with hash 683959161, now seen corresponding path program 29 times [2023-04-02 14:24:34,219 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:24:34,219 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1391896480] [2023-04-02 14:24:34,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:24:34,219 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:24:34,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:24:35,622 INFO L134 CoverageAnalysis]: Checked inductivity of 1057 backedges. 32 proven. 545 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2023-04-02 14:24:35,623 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:24:35,623 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1391896480] [2023-04-02 14:24:35,623 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1391896480] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:24:35,623 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1171512851] [2023-04-02 14:24:35,623 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:24:35,623 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:24:35,623 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:24:35,624 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:24:35,626 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2023-04-02 14:24:37,047 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2023-04-02 14:24:37,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:24:37,053 INFO L262 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 82 conjunts are in the unsatisfiable core [2023-04-02 14:24:37,055 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:24:37,108 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 14:24:39,260 INFO L134 CoverageAnalysis]: Checked inductivity of 1057 backedges. 0 proven. 577 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2023-04-02 14:24:39,260 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:24:40,132 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2023-04-02 14:24:40,138 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-04-02 14:24:40,884 INFO L134 CoverageAnalysis]: Checked inductivity of 1057 backedges. 32 proven. 545 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2023-04-02 14:24:40,885 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1171512851] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:24:40,885 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [953154824] [2023-04-02 14:24:40,885 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:24:40,886 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:24:40,886 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:24:40,886 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:24:40,886 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:24:40,912 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:24:41,052 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:24:41,065 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:24:41,067 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:24:42,541 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26181#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:24:42,541 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:24:42,541 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:24:42,541 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 41, 40] total 95 [2023-04-02 14:24:42,541 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022590642] [2023-04-02 14:24:42,541 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:24:42,542 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 95 states [2023-04-02 14:24:42,542 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:24:42,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2023-04-02 14:24:42,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=11205, Unknown=0, NotChecked=0, Total=11556 [2023-04-02 14:24:42,543 INFO L87 Difference]: Start difference. First operand 144 states and 145 transitions. Second operand has 95 states, 93 states have (on average 1.6021505376344085) internal successors, (149), 93 states have internal predecessors, (149), 50 states have call successors, (52), 4 states have call predecessors, (52), 2 states have return successors, (49), 48 states have call predecessors, (49), 48 states have call successors, (49) [2023-04-02 14:24:44,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:24:44,411 INFO L93 Difference]: Finished difference Result 154 states and 155 transitions. [2023-04-02 14:24:44,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2023-04-02 14:24:44,411 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 93 states have (on average 1.6021505376344085) internal successors, (149), 93 states have internal predecessors, (149), 50 states have call successors, (52), 4 states have call predecessors, (52), 2 states have return successors, (49), 48 states have call predecessors, (49), 48 states have call successors, (49) Word has length 141 [2023-04-02 14:24:44,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:24:44,412 INFO L225 Difference]: With dead ends: 154 [2023-04-02 14:24:44,412 INFO L226 Difference]: Without dead ends: 152 [2023-04-02 14:24:44,413 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 323 SyntacticMatches, 33 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2853 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=379, Invalid=12053, Unknown=0, NotChecked=0, Total=12432 [2023-04-02 14:24:44,414 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 15 mSDsluCounter, 556 mSDsCounter, 0 mSdLazyCounter, 5278 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 584 SdHoareTripleChecker+Invalid, 5288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 5278 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2023-04-02 14:24:44,414 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 584 Invalid, 5288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 5278 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2023-04-02 14:24:44,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2023-04-02 14:24:44,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 151. [2023-04-02 14:24:44,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 111 states have (on average 1.018018018018018) internal successors, (113), 112 states have internal predecessors, (113), 20 states have call successors, (20), 20 states have call predecessors, (20), 19 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2023-04-02 14:24:44,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 152 transitions. [2023-04-02 14:24:44,447 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 152 transitions. Word has length 141 [2023-04-02 14:24:44,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:24:44,448 INFO L495 AbstractCegarLoop]: Abstraction has 151 states and 152 transitions. [2023-04-02 14:24:44,448 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 95 states, 93 states have (on average 1.6021505376344085) internal successors, (149), 93 states have internal predecessors, (149), 50 states have call successors, (52), 4 states have call predecessors, (52), 2 states have return successors, (49), 48 states have call predecessors, (49), 48 states have call successors, (49) [2023-04-02 14:24:44,448 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 152 transitions. [2023-04-02 14:24:44,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2023-04-02 14:24:44,449 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:24:44,449 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 18, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:24:44,461 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2023-04-02 14:24:44,657 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2023-04-02 14:24:44,657 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:24:44,657 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:24:44,657 INFO L85 PathProgramCache]: Analyzing trace with hash 604001849, now seen corresponding path program 30 times [2023-04-02 14:24:44,657 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:24:44,657 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [493010132] [2023-04-02 14:24:44,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:24:44,658 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:24:44,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:24:45,380 INFO L134 CoverageAnalysis]: Checked inductivity of 1173 backedges. 427 proven. 202 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2023-04-02 14:24:45,380 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:24:45,380 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [493010132] [2023-04-02 14:24:45,380 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [493010132] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:24:45,380 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [517283508] [2023-04-02 14:24:45,380 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:24:45,380 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:24:45,381 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:24:45,381 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:24:45,383 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2023-04-02 14:24:45,813 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:24:45,813 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:24:45,817 INFO L262 TraceCheckSpWp]: Trace formula consists of 475 conjuncts, 38 conjunts are in the unsatisfiable core [2023-04-02 14:24:45,819 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:24:46,465 INFO L134 CoverageAnalysis]: Checked inductivity of 1173 backedges. 476 proven. 153 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2023-04-02 14:24:46,466 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:24:46,894 INFO L134 CoverageAnalysis]: Checked inductivity of 1173 backedges. 476 proven. 153 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2023-04-02 14:24:46,895 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [517283508] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:24:46,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2018083847] [2023-04-02 14:24:46,896 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:24:46,896 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:24:46,896 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:24:46,896 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:24:46,896 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:24:46,914 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:24:47,069 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:24:47,086 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:24:47,088 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:24:47,946 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27603#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:24:47,947 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:24:47,947 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:24:47,947 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 39, 38] total 59 [2023-04-02 14:24:47,947 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564295522] [2023-04-02 14:24:47,947 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:24:47,947 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2023-04-02 14:24:47,947 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:24:47,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2023-04-02 14:24:47,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=843, Invalid=4269, Unknown=0, NotChecked=0, Total=5112 [2023-04-02 14:24:47,949 INFO L87 Difference]: Start difference. First operand 151 states and 152 transitions. Second operand has 59 states, 59 states have (on average 1.7966101694915255) internal successors, (106), 59 states have internal predecessors, (106), 37 states have call successors, (38), 3 states have call predecessors, (38), 2 states have return successors, (36), 36 states have call predecessors, (36), 36 states have call successors, (36) [2023-04-02 14:24:48,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:24:48,484 INFO L93 Difference]: Finished difference Result 285 states and 288 transitions. [2023-04-02 14:24:48,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2023-04-02 14:24:48,485 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.7966101694915255) internal successors, (106), 59 states have internal predecessors, (106), 37 states have call successors, (38), 3 states have call predecessors, (38), 2 states have return successors, (36), 36 states have call predecessors, (36), 36 states have call successors, (36) Word has length 148 [2023-04-02 14:24:48,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:24:48,486 INFO L225 Difference]: With dead ends: 285 [2023-04-02 14:24:48,486 INFO L226 Difference]: Without dead ends: 156 [2023-04-02 14:24:48,487 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 377 SyntacticMatches, 34 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3257 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1387, Invalid=6445, Unknown=0, NotChecked=0, Total=7832 [2023-04-02 14:24:48,487 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 121 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 540 mSolverCounterSat, 222 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 762 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 222 IncrementalHoareTripleChecker+Valid, 540 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 14:24:48,487 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 74 Invalid, 762 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [222 Valid, 540 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 14:24:48,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2023-04-02 14:24:48,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 152. [2023-04-02 14:24:48,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 112 states have (on average 1.0178571428571428) internal successors, (114), 113 states have internal predecessors, (114), 20 states have call successors, (20), 20 states have call predecessors, (20), 19 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2023-04-02 14:24:48,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 153 transitions. [2023-04-02 14:24:48,520 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 153 transitions. Word has length 148 [2023-04-02 14:24:48,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:24:48,521 INFO L495 AbstractCegarLoop]: Abstraction has 152 states and 153 transitions. [2023-04-02 14:24:48,521 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.7966101694915255) internal successors, (106), 59 states have internal predecessors, (106), 37 states have call successors, (38), 3 states have call predecessors, (38), 2 states have return successors, (36), 36 states have call predecessors, (36), 36 states have call successors, (36) [2023-04-02 14:24:48,521 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 153 transitions. [2023-04-02 14:24:48,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2023-04-02 14:24:48,522 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:24:48,522 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:24:48,530 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2023-04-02 14:24:48,730 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:24:48,730 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:24:48,730 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:24:48,731 INFO L85 PathProgramCache]: Analyzing trace with hash -1961553096, now seen corresponding path program 31 times [2023-04-02 14:24:48,731 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:24:48,731 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1420429720] [2023-04-02 14:24:48,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:24:48,731 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:24:48,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:24:49,970 INFO L134 CoverageAnalysis]: Checked inductivity of 1191 backedges. 34 proven. 613 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2023-04-02 14:24:49,970 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:24:49,971 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1420429720] [2023-04-02 14:24:49,971 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1420429720] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:24:49,971 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2083069010] [2023-04-02 14:24:49,971 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:24:49,971 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:24:49,971 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:24:49,972 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:24:49,973 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2023-04-02 14:24:50,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:24:50,123 INFO L262 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 86 conjunts are in the unsatisfiable core [2023-04-02 14:24:50,127 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:24:50,755 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 14:24:53,665 INFO L134 CoverageAnalysis]: Checked inductivity of 1191 backedges. 0 proven. 647 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2023-04-02 14:24:53,666 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:24:53,819 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2023-04-02 14:24:53,821 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-04-02 14:24:53,871 INFO L134 CoverageAnalysis]: Checked inductivity of 1191 backedges. 34 proven. 613 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2023-04-02 14:24:53,872 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2083069010] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:24:53,872 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1903854734] [2023-04-02 14:24:53,872 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:24:53,873 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:24:53,873 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:24:53,873 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:24:53,873 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:24:53,884 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:24:54,020 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:24:54,034 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:24:54,036 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:24:55,403 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29273#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:24:55,403 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:24:55,403 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:24:55,403 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 43, 42] total 84 [2023-04-02 14:24:55,403 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88859080] [2023-04-02 14:24:55,403 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:24:55,404 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2023-04-02 14:24:55,404 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:24:55,404 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2023-04-02 14:24:55,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=9007, Unknown=0, NotChecked=0, Total=9312 [2023-04-02 14:24:55,405 INFO L87 Difference]: Start difference. First operand 152 states and 153 transitions. Second operand has 84 states, 82 states have (on average 1.5365853658536586) internal successors, (126), 82 states have internal predecessors, (126), 38 states have call successors, (39), 4 states have call predecessors, (39), 2 states have return successors, (36), 36 states have call predecessors, (36), 36 states have call successors, (36) [2023-04-02 14:24:57,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:24:57,176 INFO L93 Difference]: Finished difference Result 162 states and 163 transitions. [2023-04-02 14:24:57,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2023-04-02 14:24:57,177 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 82 states have (on average 1.5365853658536586) internal successors, (126), 82 states have internal predecessors, (126), 38 states have call successors, (39), 4 states have call predecessors, (39), 2 states have return successors, (36), 36 states have call predecessors, (36), 36 states have call successors, (36) Word has length 149 [2023-04-02 14:24:57,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:24:57,177 INFO L225 Difference]: With dead ends: 162 [2023-04-02 14:24:57,178 INFO L226 Difference]: Without dead ends: 160 [2023-04-02 14:24:57,178 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 492 GetRequests, 358 SyntacticMatches, 35 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2793 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=332, Invalid=9768, Unknown=0, NotChecked=0, Total=10100 [2023-04-02 14:24:57,178 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 13 mSDsluCounter, 500 mSDsCounter, 0 mSdLazyCounter, 5070 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 529 SdHoareTripleChecker+Invalid, 5077 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 5070 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2023-04-02 14:24:57,179 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 529 Invalid, 5077 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 5070 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2023-04-02 14:24:57,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2023-04-02 14:24:57,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 159. [2023-04-02 14:24:57,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 117 states have (on average 1.017094017094017) internal successors, (119), 118 states have internal predecessors, (119), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2023-04-02 14:24:57,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 160 transitions. [2023-04-02 14:24:57,212 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 160 transitions. Word has length 149 [2023-04-02 14:24:57,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:24:57,213 INFO L495 AbstractCegarLoop]: Abstraction has 159 states and 160 transitions. [2023-04-02 14:24:57,213 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 82 states have (on average 1.5365853658536586) internal successors, (126), 82 states have internal predecessors, (126), 38 states have call successors, (39), 4 states have call predecessors, (39), 2 states have return successors, (36), 36 states have call predecessors, (36), 36 states have call successors, (36) [2023-04-02 14:24:57,213 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 160 transitions. [2023-04-02 14:24:57,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2023-04-02 14:24:57,214 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:24:57,214 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 19, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:24:57,225 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2023-04-02 14:24:57,421 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:24:57,421 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:24:57,421 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:24:57,422 INFO L85 PathProgramCache]: Analyzing trace with hash -161660518, now seen corresponding path program 32 times [2023-04-02 14:24:57,422 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:24:57,422 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530307139] [2023-04-02 14:24:57,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:24:57,422 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:24:57,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:24:58,262 INFO L134 CoverageAnalysis]: Checked inductivity of 1314 backedges. 479 proven. 223 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2023-04-02 14:24:58,262 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:24:58,262 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530307139] [2023-04-02 14:24:58,262 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1530307139] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:24:58,262 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [237679747] [2023-04-02 14:24:58,262 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:24:58,262 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:24:58,263 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:24:58,264 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:24:58,266 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2023-04-02 14:25:00,192 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2023-04-02 14:25:00,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:25:00,198 INFO L262 TraceCheckSpWp]: Trace formula consists of 498 conjuncts, 40 conjunts are in the unsatisfiable core [2023-04-02 14:25:00,201 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:25:00,894 INFO L134 CoverageAnalysis]: Checked inductivity of 1314 backedges. 531 proven. 171 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2023-04-02 14:25:00,894 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:25:01,384 INFO L134 CoverageAnalysis]: Checked inductivity of 1314 backedges. 531 proven. 171 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2023-04-02 14:25:01,384 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [237679747] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:25:01,385 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [352624059] [2023-04-02 14:25:01,385 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:25:01,385 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:25:01,385 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:25:01,386 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:25:01,386 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:25:01,396 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:25:01,536 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:25:01,551 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:25:01,553 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:25:02,448 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30770#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:25:02,448 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:25:02,448 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:25:02,449 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 41, 40] total 62 [2023-04-02 14:25:02,449 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533407786] [2023-04-02 14:25:02,449 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:25:02,449 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2023-04-02 14:25:02,449 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:25:02,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2023-04-02 14:25:02,451 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=925, Invalid=4625, Unknown=0, NotChecked=0, Total=5550 [2023-04-02 14:25:02,451 INFO L87 Difference]: Start difference. First operand 159 states and 160 transitions. Second operand has 62 states, 62 states have (on average 1.7903225806451613) internal successors, (111), 62 states have internal predecessors, (111), 39 states have call successors, (40), 3 states have call predecessors, (40), 2 states have return successors, (38), 38 states have call predecessors, (38), 38 states have call successors, (38) [2023-04-02 14:25:03,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:25:03,162 INFO L93 Difference]: Finished difference Result 300 states and 303 transitions. [2023-04-02 14:25:03,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2023-04-02 14:25:03,162 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.7903225806451613) internal successors, (111), 62 states have internal predecessors, (111), 39 states have call successors, (40), 3 states have call predecessors, (40), 2 states have return successors, (38), 38 states have call predecessors, (38), 38 states have call successors, (38) Word has length 156 [2023-04-02 14:25:03,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:25:03,163 INFO L225 Difference]: With dead ends: 300 [2023-04-02 14:25:03,163 INFO L226 Difference]: Without dead ends: 164 [2023-04-02 14:25:03,165 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 525 GetRequests, 398 SyntacticMatches, 36 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3559 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1528, Invalid=7028, Unknown=0, NotChecked=0, Total=8556 [2023-04-02 14:25:03,165 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 91 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 746 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 907 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 746 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-02 14:25:03,165 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 123 Invalid, 907 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 746 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-02 14:25:03,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2023-04-02 14:25:03,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 160. [2023-04-02 14:25:03,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 118 states have (on average 1.0169491525423728) internal successors, (120), 119 states have internal predecessors, (120), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2023-04-02 14:25:03,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 161 transitions. [2023-04-02 14:25:03,191 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 161 transitions. Word has length 156 [2023-04-02 14:25:03,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:25:03,191 INFO L495 AbstractCegarLoop]: Abstraction has 160 states and 161 transitions. [2023-04-02 14:25:03,192 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 1.7903225806451613) internal successors, (111), 62 states have internal predecessors, (111), 39 states have call successors, (40), 3 states have call predecessors, (40), 2 states have return successors, (38), 38 states have call predecessors, (38), 38 states have call successors, (38) [2023-04-02 14:25:03,192 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 161 transitions. [2023-04-02 14:25:03,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2023-04-02 14:25:03,192 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:25:03,193 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:25:03,202 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2023-04-02 14:25:03,401 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2023-04-02 14:25:03,401 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:25:03,401 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:25:03,401 INFO L85 PathProgramCache]: Analyzing trace with hash -81752167, now seen corresponding path program 33 times [2023-04-02 14:25:03,401 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:25:03,401 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [917825209] [2023-04-02 14:25:03,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:25:03,402 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:25:03,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:25:04,773 INFO L134 CoverageAnalysis]: Checked inductivity of 1333 backedges. 36 proven. 685 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2023-04-02 14:25:04,773 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:25:04,773 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [917825209] [2023-04-02 14:25:04,773 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [917825209] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:25:04,773 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [519352273] [2023-04-02 14:25:04,773 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:25:04,774 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:25:04,774 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:25:04,775 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:25:04,776 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2023-04-02 14:25:05,515 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:25:05,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:25:05,520 INFO L262 TraceCheckSpWp]: Trace formula consists of 507 conjuncts, 95 conjunts are in the unsatisfiable core [2023-04-02 14:25:05,524 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:25:06,249 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 14:25:09,551 INFO L134 CoverageAnalysis]: Checked inductivity of 1333 backedges. 0 proven. 772 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2023-04-02 14:25:09,552 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:25:09,726 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2023-04-02 14:25:09,728 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-04-02 14:25:09,780 INFO L134 CoverageAnalysis]: Checked inductivity of 1333 backedges. 36 proven. 685 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2023-04-02 14:25:09,781 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [519352273] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:25:09,781 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [11838153] [2023-04-02 14:25:09,781 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:25:09,781 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:25:09,782 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:25:09,782 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:25:09,782 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:25:09,793 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:25:09,954 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:25:09,968 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:25:09,971 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:25:11,417 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32530#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:25:11,417 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:25:11,417 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:25:11,417 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 47, 44] total 90 [2023-04-02 14:25:11,417 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852899337] [2023-04-02 14:25:11,417 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:25:11,418 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 90 states [2023-04-02 14:25:11,418 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:25:11,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2023-04-02 14:25:11,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=10181, Unknown=0, NotChecked=0, Total=10506 [2023-04-02 14:25:11,419 INFO L87 Difference]: Start difference. First operand 160 states and 161 transitions. Second operand has 90 states, 88 states have (on average 1.5340909090909092) internal successors, (135), 88 states have internal predecessors, (135), 40 states have call successors, (41), 4 states have call predecessors, (41), 3 states have return successors, (38), 38 states have call predecessors, (38), 38 states have call successors, (38) [2023-04-02 14:25:14,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:25:14,074 INFO L93 Difference]: Finished difference Result 170 states and 171 transitions. [2023-04-02 14:25:14,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2023-04-02 14:25:14,075 INFO L78 Accepts]: Start accepts. Automaton has has 90 states, 88 states have (on average 1.5340909090909092) internal successors, (135), 88 states have internal predecessors, (135), 40 states have call successors, (41), 4 states have call predecessors, (41), 3 states have return successors, (38), 38 states have call predecessors, (38), 38 states have call successors, (38) Word has length 157 [2023-04-02 14:25:14,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:25:14,075 INFO L225 Difference]: With dead ends: 170 [2023-04-02 14:25:14,075 INFO L226 Difference]: Without dead ends: 168 [2023-04-02 14:25:14,076 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 537 GetRequests, 376 SyntacticMatches, 37 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4313 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=528, Invalid=15222, Unknown=0, NotChecked=0, Total=15750 [2023-04-02 14:25:14,076 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 22 mSDsluCounter, 461 mSDsCounter, 0 mSdLazyCounter, 6000 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 489 SdHoareTripleChecker+Invalid, 6029 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 6000 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2023-04-02 14:25:14,076 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 489 Invalid, 6029 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 6000 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2023-04-02 14:25:14,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2023-04-02 14:25:14,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 167. [2023-04-02 14:25:14,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 123 states have (on average 1.016260162601626) internal successors, (125), 124 states have internal predecessors, (125), 22 states have call successors, (22), 22 states have call predecessors, (22), 21 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2023-04-02 14:25:14,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 168 transitions. [2023-04-02 14:25:14,112 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 168 transitions. Word has length 157 [2023-04-02 14:25:14,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:25:14,113 INFO L495 AbstractCegarLoop]: Abstraction has 167 states and 168 transitions. [2023-04-02 14:25:14,113 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 90 states, 88 states have (on average 1.5340909090909092) internal successors, (135), 88 states have internal predecessors, (135), 40 states have call successors, (41), 4 states have call predecessors, (41), 3 states have return successors, (38), 38 states have call predecessors, (38), 38 states have call successors, (38) [2023-04-02 14:25:14,113 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 168 transitions. [2023-04-02 14:25:14,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2023-04-02 14:25:14,113 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:25:14,114 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 20, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:25:14,121 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2023-04-02 14:25:14,314 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2023-04-02 14:25:14,314 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:25:14,314 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:25:14,314 INFO L85 PathProgramCache]: Analyzing trace with hash -503298535, now seen corresponding path program 34 times [2023-04-02 14:25:14,315 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:25:14,315 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [307831019] [2023-04-02 14:25:14,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:25:14,315 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:25:14,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:25:15,044 INFO L134 CoverageAnalysis]: Checked inductivity of 1463 backedges. 534 proven. 245 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2023-04-02 14:25:15,044 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:25:15,044 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [307831019] [2023-04-02 14:25:15,044 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [307831019] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:25:15,044 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1999188537] [2023-04-02 14:25:15,044 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:25:15,045 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:25:15,045 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:25:15,046 INFO L229 MonitoredProcess]: Starting monitored process 36 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:25:15,047 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2023-04-02 14:25:15,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:25:15,194 INFO L262 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 42 conjunts are in the unsatisfiable core [2023-04-02 14:25:15,196 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:25:15,920 INFO L134 CoverageAnalysis]: Checked inductivity of 1463 backedges. 589 proven. 190 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2023-04-02 14:25:15,920 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:25:16,434 INFO L134 CoverageAnalysis]: Checked inductivity of 1463 backedges. 589 proven. 190 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2023-04-02 14:25:16,435 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1999188537] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:25:16,435 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [90287970] [2023-04-02 14:25:16,435 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:25:16,435 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:25:16,436 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:25:16,436 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:25:16,436 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:25:16,451 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:25:16,591 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:25:16,605 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:25:16,610 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:25:17,508 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34140#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:25:17,508 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:25:17,508 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:25:17,508 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 43, 42] total 65 [2023-04-02 14:25:17,508 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8088494] [2023-04-02 14:25:17,508 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:25:17,509 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2023-04-02 14:25:17,509 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:25:17,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2023-04-02 14:25:17,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1011, Invalid=4995, Unknown=0, NotChecked=0, Total=6006 [2023-04-02 14:25:17,510 INFO L87 Difference]: Start difference. First operand 167 states and 168 transitions. Second operand has 65 states, 65 states have (on average 1.7846153846153847) internal successors, (116), 65 states have internal predecessors, (116), 41 states have call successors, (42), 3 states have call predecessors, (42), 2 states have return successors, (40), 40 states have call predecessors, (40), 40 states have call successors, (40) [2023-04-02 14:25:18,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:25:18,196 INFO L93 Difference]: Finished difference Result 315 states and 318 transitions. [2023-04-02 14:25:18,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2023-04-02 14:25:18,196 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.7846153846153847) internal successors, (116), 65 states have internal predecessors, (116), 41 states have call successors, (42), 3 states have call predecessors, (42), 2 states have return successors, (40), 40 states have call predecessors, (40), 40 states have call successors, (40) Word has length 164 [2023-04-02 14:25:18,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:25:18,197 INFO L225 Difference]: With dead ends: 315 [2023-04-02 14:25:18,197 INFO L226 Difference]: Without dead ends: 172 [2023-04-02 14:25:18,198 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 552 GetRequests, 419 SyntacticMatches, 38 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3874 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1676, Invalid=7636, Unknown=0, NotChecked=0, Total=9312 [2023-04-02 14:25:18,199 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 108 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 706 mSolverCounterSat, 194 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 900 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 194 IncrementalHoareTripleChecker+Valid, 706 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 14:25:18,199 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [128 Valid, 94 Invalid, 900 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [194 Valid, 706 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 14:25:18,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2023-04-02 14:25:18,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 168. [2023-04-02 14:25:18,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 124 states have (on average 1.0161290322580645) internal successors, (126), 125 states have internal predecessors, (126), 22 states have call successors, (22), 22 states have call predecessors, (22), 21 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2023-04-02 14:25:18,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 169 transitions. [2023-04-02 14:25:18,237 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 169 transitions. Word has length 164 [2023-04-02 14:25:18,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:25:18,237 INFO L495 AbstractCegarLoop]: Abstraction has 168 states and 169 transitions. [2023-04-02 14:25:18,237 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 1.7846153846153847) internal successors, (116), 65 states have internal predecessors, (116), 41 states have call successors, (42), 3 states have call predecessors, (42), 2 states have return successors, (40), 40 states have call predecessors, (40), 40 states have call successors, (40) [2023-04-02 14:25:18,237 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 169 transitions. [2023-04-02 14:25:18,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2023-04-02 14:25:18,238 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:25:18,238 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:25:18,249 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2023-04-02 14:25:18,445 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2023-04-02 14:25:18,446 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:25:18,446 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:25:18,446 INFO L85 PathProgramCache]: Analyzing trace with hash -1185864424, now seen corresponding path program 35 times [2023-04-02 14:25:18,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:25:18,446 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [77695175] [2023-04-02 14:25:18,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:25:18,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:25:18,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:25:20,025 INFO L134 CoverageAnalysis]: Checked inductivity of 1483 backedges. 38 proven. 761 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2023-04-02 14:25:20,025 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:25:20,025 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [77695175] [2023-04-02 14:25:20,025 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [77695175] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:25:20,025 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1877713282] [2023-04-02 14:25:20,025 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:25:20,025 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:25:20,025 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:25:20,026 INFO L229 MonitoredProcess]: Starting monitored process 37 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:25:20,028 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2023-04-02 14:25:21,967 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2023-04-02 14:25:21,967 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:25:21,975 INFO L262 TraceCheckSpWp]: Trace formula consists of 530 conjuncts, 97 conjunts are in the unsatisfiable core [2023-04-02 14:25:21,978 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:25:22,019 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-04-02 14:25:26,885 INFO L134 CoverageAnalysis]: Checked inductivity of 1483 backedges. 48 proven. 805 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2023-04-02 14:25:26,885 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:25:27,740 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2023-04-02 14:25:27,742 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-04-02 14:25:27,799 INFO L134 CoverageAnalysis]: Checked inductivity of 1483 backedges. 38 proven. 761 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2023-04-02 14:25:27,799 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1877713282] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:25:27,799 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1433428894] [2023-04-02 14:25:27,800 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:25:27,800 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:25:27,800 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:25:27,800 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:25:27,800 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:25:27,811 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:25:27,961 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:25:27,976 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:25:27,978 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:25:29,164 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35966#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:25:29,164 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:25:29,164 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:25:29,164 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 49, 46] total 72 [2023-04-02 14:25:29,164 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411425731] [2023-04-02 14:25:29,164 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:25:29,165 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2023-04-02 14:25:29,165 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:25:29,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2023-04-02 14:25:29,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=6890, Unknown=0, NotChecked=0, Total=7140 [2023-04-02 14:25:29,166 INFO L87 Difference]: Start difference. First operand 168 states and 169 transitions. Second operand has 72 states, 70 states have (on average 1.6714285714285715) internal successors, (117), 70 states have internal predecessors, (117), 41 states have call successors, (62), 4 states have call predecessors, (62), 3 states have return successors, (58), 39 states have call predecessors, (58), 39 states have call successors, (58) [2023-04-02 14:25:32,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:25:32,075 INFO L93 Difference]: Finished difference Result 178 states and 179 transitions. [2023-04-02 14:25:32,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2023-04-02 14:25:32,076 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 70 states have (on average 1.6714285714285715) internal successors, (117), 70 states have internal predecessors, (117), 41 states have call successors, (62), 4 states have call predecessors, (62), 3 states have return successors, (58), 39 states have call predecessors, (58), 39 states have call successors, (58) Word has length 165 [2023-04-02 14:25:32,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:25:32,077 INFO L225 Difference]: With dead ends: 178 [2023-04-02 14:25:32,077 INFO L226 Difference]: Without dead ends: 176 [2023-04-02 14:25:32,078 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 564 GetRequests, 414 SyntacticMatches, 43 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2859 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=440, Invalid=11332, Unknown=0, NotChecked=0, Total=11772 [2023-04-02 14:25:32,079 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 24 mSDsluCounter, 391 mSDsCounter, 0 mSdLazyCounter, 5611 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 420 SdHoareTripleChecker+Invalid, 5644 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 5611 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2023-04-02 14:25:32,079 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 420 Invalid, 5644 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 5611 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2023-04-02 14:25:32,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2023-04-02 14:25:32,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 175. [2023-04-02 14:25:32,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 129 states have (on average 1.0155038759689923) internal successors, (131), 130 states have internal predecessors, (131), 23 states have call successors, (23), 23 states have call predecessors, (23), 22 states have return successors, (22), 21 states have call predecessors, (22), 22 states have call successors, (22) [2023-04-02 14:25:32,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 176 transitions. [2023-04-02 14:25:32,123 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 176 transitions. Word has length 165 [2023-04-02 14:25:32,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:25:32,124 INFO L495 AbstractCegarLoop]: Abstraction has 175 states and 176 transitions. [2023-04-02 14:25:32,124 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 70 states have (on average 1.6714285714285715) internal successors, (117), 70 states have internal predecessors, (117), 41 states have call successors, (62), 4 states have call predecessors, (62), 3 states have return successors, (58), 39 states have call predecessors, (58), 39 states have call successors, (58) [2023-04-02 14:25:32,124 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 176 transitions. [2023-04-02 14:25:32,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2023-04-02 14:25:32,125 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:25:32,125 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 21, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:25:32,137 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2023-04-02 14:25:32,334 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,37 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:25:32,335 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:25:32,335 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:25:32,335 INFO L85 PathProgramCache]: Analyzing trace with hash 1705202618, now seen corresponding path program 36 times [2023-04-02 14:25:32,335 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:25:32,335 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1717954466] [2023-04-02 14:25:32,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:25:32,336 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:25:32,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:25:33,217 INFO L134 CoverageAnalysis]: Checked inductivity of 1620 backedges. 592 proven. 268 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2023-04-02 14:25:33,217 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:25:33,217 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1717954466] [2023-04-02 14:25:33,218 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1717954466] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:25:33,218 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2031243784] [2023-04-02 14:25:33,218 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:25:33,218 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:25:33,218 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:25:33,219 INFO L229 MonitoredProcess]: Starting monitored process 38 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:25:33,221 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2023-04-02 14:25:33,711 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:25:33,711 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:25:33,715 INFO L262 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 44 conjunts are in the unsatisfiable core [2023-04-02 14:25:33,719 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:25:34,571 INFO L134 CoverageAnalysis]: Checked inductivity of 1620 backedges. 650 proven. 210 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2023-04-02 14:25:34,571 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:25:35,143 INFO L134 CoverageAnalysis]: Checked inductivity of 1620 backedges. 650 proven. 210 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2023-04-02 14:25:35,144 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2031243784] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:25:35,144 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1592220560] [2023-04-02 14:25:35,145 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:25:35,145 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:25:35,145 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:25:35,145 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:25:35,145 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:25:35,160 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:25:35,305 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:25:35,320 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:25:35,322 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:25:36,253 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37653#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:25:36,253 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:25:36,253 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:25:36,253 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 45, 44] total 68 [2023-04-02 14:25:36,253 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846963075] [2023-04-02 14:25:36,253 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:25:36,254 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2023-04-02 14:25:36,254 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:25:36,254 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2023-04-02 14:25:36,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1101, Invalid=5379, Unknown=0, NotChecked=0, Total=6480 [2023-04-02 14:25:36,255 INFO L87 Difference]: Start difference. First operand 175 states and 176 transitions. Second operand has 68 states, 68 states have (on average 1.7794117647058822) internal successors, (121), 68 states have internal predecessors, (121), 43 states have call successors, (44), 3 states have call predecessors, (44), 2 states have return successors, (42), 42 states have call predecessors, (42), 42 states have call successors, (42) [2023-04-02 14:25:36,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:25:36,935 INFO L93 Difference]: Finished difference Result 330 states and 333 transitions. [2023-04-02 14:25:36,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2023-04-02 14:25:36,936 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 1.7794117647058822) internal successors, (121), 68 states have internal predecessors, (121), 43 states have call successors, (44), 3 states have call predecessors, (44), 2 states have return successors, (42), 42 states have call predecessors, (42), 42 states have call successors, (42) Word has length 172 [2023-04-02 14:25:36,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:25:36,937 INFO L225 Difference]: With dead ends: 330 [2023-04-02 14:25:36,937 INFO L226 Difference]: Without dead ends: 180 [2023-04-02 14:25:36,938 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 579 GetRequests, 440 SyntacticMatches, 40 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4202 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1831, Invalid=8269, Unknown=0, NotChecked=0, Total=10100 [2023-04-02 14:25:36,939 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 97 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 823 mSolverCounterSat, 171 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 994 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 171 IncrementalHoareTripleChecker+Valid, 823 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 14:25:36,939 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [118 Valid, 131 Invalid, 994 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [171 Valid, 823 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 14:25:36,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2023-04-02 14:25:36,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 176. [2023-04-02 14:25:36,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 130 states have (on average 1.0153846153846153) internal successors, (132), 131 states have internal predecessors, (132), 23 states have call successors, (23), 23 states have call predecessors, (23), 22 states have return successors, (22), 21 states have call predecessors, (22), 22 states have call successors, (22) [2023-04-02 14:25:36,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 177 transitions. [2023-04-02 14:25:36,982 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 177 transitions. Word has length 172 [2023-04-02 14:25:36,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:25:36,982 INFO L495 AbstractCegarLoop]: Abstraction has 176 states and 177 transitions. [2023-04-02 14:25:36,982 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 1.7794117647058822) internal successors, (121), 68 states have internal predecessors, (121), 43 states have call successors, (44), 3 states have call predecessors, (44), 2 states have return successors, (42), 42 states have call predecessors, (42), 42 states have call successors, (42) [2023-04-02 14:25:36,982 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 177 transitions. [2023-04-02 14:25:36,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2023-04-02 14:25:36,983 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:25:36,983 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:25:36,995 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2023-04-02 14:25:37,192 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2023-04-02 14:25:37,192 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:25:37,192 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:25:37,192 INFO L85 PathProgramCache]: Analyzing trace with hash -178207815, now seen corresponding path program 37 times [2023-04-02 14:25:37,193 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:25:37,193 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1560533579] [2023-04-02 14:25:37,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:25:37,193 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:25:37,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:25:39,021 INFO L134 CoverageAnalysis]: Checked inductivity of 1641 backedges. 40 proven. 841 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2023-04-02 14:25:39,021 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:25:39,021 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1560533579] [2023-04-02 14:25:39,021 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1560533579] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:25:39,021 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1949999141] [2023-04-02 14:25:39,021 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:25:39,021 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:25:39,021 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:25:39,022 INFO L229 MonitoredProcess]: Starting monitored process 39 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:25:39,024 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2023-04-02 14:25:39,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:25:39,182 INFO L262 TraceCheckSpWp]: Trace formula consists of 553 conjuncts, 98 conjunts are in the unsatisfiable core [2023-04-02 14:25:39,185 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:25:39,247 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 14:25:42,311 INFO L134 CoverageAnalysis]: Checked inductivity of 1641 backedges. 0 proven. 881 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2023-04-02 14:25:42,311 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:25:43,562 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2023-04-02 14:25:43,563 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-04-02 14:25:44,653 INFO L134 CoverageAnalysis]: Checked inductivity of 1641 backedges. 40 proven. 841 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2023-04-02 14:25:44,653 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1949999141] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:25:44,653 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [530921256] [2023-04-02 14:25:44,654 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:25:44,654 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:25:44,654 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:25:44,654 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:25:44,654 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:25:44,666 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:25:44,807 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:25:44,821 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:25:44,824 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:25:46,495 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39606#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:25:46,495 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:25:46,495 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:25:46,496 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 49, 48] total 115 [2023-04-02 14:25:46,496 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969930531] [2023-04-02 14:25:46,496 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:25:46,496 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2023-04-02 14:25:46,496 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:25:46,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2023-04-02 14:25:46,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=15837, Unknown=0, NotChecked=0, Total=16256 [2023-04-02 14:25:46,498 INFO L87 Difference]: Start difference. First operand 176 states and 177 transitions. Second operand has 115 states, 113 states have (on average 1.6017699115044248) internal successors, (181), 113 states have internal predecessors, (181), 62 states have call successors, (64), 4 states have call predecessors, (64), 2 states have return successors, (61), 60 states have call predecessors, (61), 60 states have call successors, (61) [2023-04-02 14:25:49,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:25:49,454 INFO L93 Difference]: Finished difference Result 186 states and 187 transitions. [2023-04-02 14:25:49,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2023-04-02 14:25:49,454 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 113 states have (on average 1.6017699115044248) internal successors, (181), 113 states have internal predecessors, (181), 62 states have call successors, (64), 4 states have call predecessors, (64), 2 states have return successors, (61), 60 states have call predecessors, (61), 60 states have call successors, (61) Word has length 173 [2023-04-02 14:25:49,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:25:49,455 INFO L225 Difference]: With dead ends: 186 [2023-04-02 14:25:49,455 INFO L226 Difference]: Without dead ends: 184 [2023-04-02 14:25:49,456 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 570 GetRequests, 399 SyntacticMatches, 41 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3997 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=447, Invalid=16845, Unknown=0, NotChecked=0, Total=17292 [2023-04-02 14:25:49,457 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 22 mSDsluCounter, 770 mSDsCounter, 0 mSdLazyCounter, 8623 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 802 SdHoareTripleChecker+Invalid, 8637 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 8623 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2023-04-02 14:25:49,457 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 802 Invalid, 8637 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 8623 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2023-04-02 14:25:49,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2023-04-02 14:25:49,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 183. [2023-04-02 14:25:49,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 135 states have (on average 1.0148148148148148) internal successors, (137), 136 states have internal predecessors, (137), 24 states have call successors, (24), 24 states have call predecessors, (24), 23 states have return successors, (23), 22 states have call predecessors, (23), 23 states have call successors, (23) [2023-04-02 14:25:49,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 184 transitions. [2023-04-02 14:25:49,504 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 184 transitions. Word has length 173 [2023-04-02 14:25:49,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:25:49,504 INFO L495 AbstractCegarLoop]: Abstraction has 183 states and 184 transitions. [2023-04-02 14:25:49,504 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 113 states have (on average 1.6017699115044248) internal successors, (181), 113 states have internal predecessors, (181), 62 states have call successors, (64), 4 states have call predecessors, (64), 2 states have return successors, (61), 60 states have call predecessors, (61), 60 states have call successors, (61) [2023-04-02 14:25:49,504 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 184 transitions. [2023-04-02 14:25:49,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2023-04-02 14:25:49,505 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:25:49,505 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 22, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:25:49,513 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2023-04-02 14:25:49,711 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2023-04-02 14:25:49,712 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:25:49,712 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:25:49,712 INFO L85 PathProgramCache]: Analyzing trace with hash -1727844871, now seen corresponding path program 38 times [2023-04-02 14:25:49,712 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:25:49,712 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1671854347] [2023-04-02 14:25:49,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:25:49,712 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:25:49,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:25:50,595 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 653 proven. 292 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2023-04-02 14:25:50,596 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:25:50,596 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1671854347] [2023-04-02 14:25:50,596 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1671854347] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:25:50,596 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [329076682] [2023-04-02 14:25:50,596 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:25:50,596 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:25:50,596 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:25:50,597 INFO L229 MonitoredProcess]: Starting monitored process 40 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:25:50,599 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2023-04-02 14:25:53,638 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2023-04-02 14:25:53,638 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:25:53,647 INFO L262 TraceCheckSpWp]: Trace formula consists of 567 conjuncts, 46 conjunts are in the unsatisfiable core [2023-04-02 14:25:53,650 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:25:54,499 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 714 proven. 231 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2023-04-02 14:25:54,500 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:25:55,114 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 714 proven. 231 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2023-04-02 14:25:55,114 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [329076682] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:25:55,114 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1963187693] [2023-04-02 14:25:55,115 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:25:55,115 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:25:55,115 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:25:55,115 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:25:55,115 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:25:55,133 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:25:55,267 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:25:55,280 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:25:55,282 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:25:56,242 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '41328#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:25:56,243 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:25:56,243 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:25:56,243 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 47, 46] total 71 [2023-04-02 14:25:56,243 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44979444] [2023-04-02 14:25:56,243 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:25:56,243 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2023-04-02 14:25:56,244 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:25:56,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2023-04-02 14:25:56,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1195, Invalid=5777, Unknown=0, NotChecked=0, Total=6972 [2023-04-02 14:25:56,245 INFO L87 Difference]: Start difference. First operand 183 states and 184 transitions. Second operand has 71 states, 71 states have (on average 1.7746478873239437) internal successors, (126), 71 states have internal predecessors, (126), 45 states have call successors, (46), 3 states have call predecessors, (46), 2 states have return successors, (44), 44 states have call predecessors, (44), 44 states have call successors, (44) [2023-04-02 14:25:56,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:25:56,904 INFO L93 Difference]: Finished difference Result 345 states and 348 transitions. [2023-04-02 14:25:56,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2023-04-02 14:25:56,904 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 1.7746478873239437) internal successors, (126), 71 states have internal predecessors, (126), 45 states have call successors, (46), 3 states have call predecessors, (46), 2 states have return successors, (44), 44 states have call predecessors, (44), 44 states have call successors, (44) Word has length 180 [2023-04-02 14:25:56,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:25:56,905 INFO L225 Difference]: With dead ends: 345 [2023-04-02 14:25:56,905 INFO L226 Difference]: Without dead ends: 188 [2023-04-02 14:25:56,906 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 606 GetRequests, 461 SyntacticMatches, 42 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4543 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1993, Invalid=8927, Unknown=0, NotChecked=0, Total=10920 [2023-04-02 14:25:56,907 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 99 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 745 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 919 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 745 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 14:25:56,907 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [121 Valid, 111 Invalid, 919 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [174 Valid, 745 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 14:25:56,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2023-04-02 14:25:56,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 184. [2023-04-02 14:25:56,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 136 states have (on average 1.0147058823529411) internal successors, (138), 137 states have internal predecessors, (138), 24 states have call successors, (24), 24 states have call predecessors, (24), 23 states have return successors, (23), 22 states have call predecessors, (23), 23 states have call successors, (23) [2023-04-02 14:25:56,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 185 transitions. [2023-04-02 14:25:56,940 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 185 transitions. Word has length 180 [2023-04-02 14:25:56,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:25:56,940 INFO L495 AbstractCegarLoop]: Abstraction has 184 states and 185 transitions. [2023-04-02 14:25:56,941 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 1.7746478873239437) internal successors, (126), 71 states have internal predecessors, (126), 45 states have call successors, (46), 3 states have call predecessors, (46), 2 states have return successors, (44), 44 states have call predecessors, (44), 44 states have call successors, (44) [2023-04-02 14:25:56,941 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 185 transitions. [2023-04-02 14:25:56,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2023-04-02 14:25:56,941 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:25:56,941 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:25:56,949 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2023-04-02 14:25:57,142 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2023-04-02 14:25:57,143 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:25:57,143 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:25:57,143 INFO L85 PathProgramCache]: Analyzing trace with hash 2014064376, now seen corresponding path program 39 times [2023-04-02 14:25:57,143 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:25:57,143 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [889026709] [2023-04-02 14:25:57,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:25:57,143 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:25:57,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:25:58,839 INFO L134 CoverageAnalysis]: Checked inductivity of 1807 backedges. 42 proven. 925 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2023-04-02 14:25:58,839 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:25:58,839 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [889026709] [2023-04-02 14:25:58,839 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [889026709] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:25:58,839 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [504375074] [2023-04-02 14:25:58,839 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:25:58,839 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:25:58,839 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:25:58,840 INFO L229 MonitoredProcess]: Starting monitored process 41 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:25:58,842 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2023-04-02 14:25:59,521 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:25:59,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:25:59,526 INFO L262 TraceCheckSpWp]: Trace formula consists of 576 conjuncts, 107 conjunts are in the unsatisfiable core [2023-04-02 14:25:59,533 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:26:00,431 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 14:26:04,645 INFO L134 CoverageAnalysis]: Checked inductivity of 1807 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2023-04-02 14:26:04,645 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:26:04,847 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2023-04-02 14:26:04,848 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-04-02 14:26:04,908 INFO L134 CoverageAnalysis]: Checked inductivity of 1807 backedges. 42 proven. 925 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2023-04-02 14:26:04,909 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [504375074] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:26:04,909 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1291657350] [2023-04-02 14:26:04,909 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:26:04,909 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:26:04,910 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:26:04,910 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:26:04,910 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:26:04,920 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:26:05,070 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:26:05,084 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:26:05,086 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:26:06,683 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '43352#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:26:06,683 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:26:06,683 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:26:06,683 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 53, 50] total 102 [2023-04-02 14:26:06,683 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393612663] [2023-04-02 14:26:06,683 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:26:06,684 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 102 states [2023-04-02 14:26:06,684 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:26:06,684 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2023-04-02 14:26:06,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=12746, Unknown=0, NotChecked=0, Total=13110 [2023-04-02 14:26:06,686 INFO L87 Difference]: Start difference. First operand 184 states and 185 transitions. Second operand has 102 states, 100 states have (on average 1.53) internal successors, (153), 100 states have internal predecessors, (153), 46 states have call successors, (47), 4 states have call predecessors, (47), 3 states have return successors, (44), 44 states have call predecessors, (44), 44 states have call successors, (44) [2023-04-02 14:26:09,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:26:09,915 INFO L93 Difference]: Finished difference Result 194 states and 195 transitions. [2023-04-02 14:26:09,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2023-04-02 14:26:09,916 INFO L78 Accepts]: Start accepts. Automaton has has 102 states, 100 states have (on average 1.53) internal successors, (153), 100 states have internal predecessors, (153), 46 states have call successors, (47), 4 states have call predecessors, (47), 3 states have return successors, (44), 44 states have call predecessors, (44), 44 states have call successors, (44) Word has length 181 [2023-04-02 14:26:09,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:26:09,916 INFO L225 Difference]: With dead ends: 194 [2023-04-02 14:26:09,916 INFO L226 Difference]: Without dead ends: 192 [2023-04-02 14:26:09,918 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 618 GetRequests, 436 SyntacticMatches, 43 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5489 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=594, Invalid=19146, Unknown=0, NotChecked=0, Total=19740 [2023-04-02 14:26:09,918 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 23 mSDsluCounter, 478 mSDsCounter, 0 mSdLazyCounter, 7675 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 509 SdHoareTripleChecker+Invalid, 7709 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 7675 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2023-04-02 14:26:09,918 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 509 Invalid, 7709 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 7675 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2023-04-02 14:26:09,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2023-04-02 14:26:09,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 191. [2023-04-02 14:26:09,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 141 states have (on average 1.0141843971631206) internal successors, (143), 142 states have internal predecessors, (143), 25 states have call successors, (25), 25 states have call predecessors, (25), 24 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) [2023-04-02 14:26:09,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 192 transitions. [2023-04-02 14:26:09,970 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 192 transitions. Word has length 181 [2023-04-02 14:26:09,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:26:09,971 INFO L495 AbstractCegarLoop]: Abstraction has 191 states and 192 transitions. [2023-04-02 14:26:09,971 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 102 states, 100 states have (on average 1.53) internal successors, (153), 100 states have internal predecessors, (153), 46 states have call successors, (47), 4 states have call predecessors, (47), 3 states have return successors, (44), 44 states have call predecessors, (44), 44 states have call successors, (44) [2023-04-02 14:26:09,971 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 192 transitions. [2023-04-02 14:26:09,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2023-04-02 14:26:09,972 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:26:09,972 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 23, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:26:09,983 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2023-04-02 14:26:10,180 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2023-04-02 14:26:10,181 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:26:10,182 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:26:10,182 INFO L85 PathProgramCache]: Analyzing trace with hash 2116251098, now seen corresponding path program 40 times [2023-04-02 14:26:10,182 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:26:10,182 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2139752477] [2023-04-02 14:26:10,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:26:10,182 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:26:10,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:26:11,195 INFO L134 CoverageAnalysis]: Checked inductivity of 1958 backedges. 717 proven. 317 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2023-04-02 14:26:11,195 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:26:11,195 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2139752477] [2023-04-02 14:26:11,195 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2139752477] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:26:11,195 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1996860941] [2023-04-02 14:26:11,195 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:26:11,196 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:26:11,196 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:26:11,196 INFO L229 MonitoredProcess]: Starting monitored process 42 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:26:11,199 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2023-04-02 14:26:11,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:26:11,377 INFO L262 TraceCheckSpWp]: Trace formula consists of 590 conjuncts, 48 conjunts are in the unsatisfiable core [2023-04-02 14:26:11,380 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:26:12,340 INFO L134 CoverageAnalysis]: Checked inductivity of 1958 backedges. 781 proven. 253 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2023-04-02 14:26:12,340 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:26:13,035 INFO L134 CoverageAnalysis]: Checked inductivity of 1958 backedges. 781 proven. 253 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2023-04-02 14:26:13,035 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1996860941] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:26:13,035 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [565086685] [2023-04-02 14:26:13,036 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:26:13,036 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:26:13,036 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:26:13,036 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:26:13,037 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:26:13,050 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:26:13,220 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:26:13,234 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:26:13,236 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:26:14,205 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45193#(and (<= 1 |#StackHeapBarrier|) (<= ~N~0 2147483647) (<= 1 ~N~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:26:14,205 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:26:14,205 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:26:14,205 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 49, 48] total 74 [2023-04-02 14:26:14,206 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202654058] [2023-04-02 14:26:14,206 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:26:14,206 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2023-04-02 14:26:14,206 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:26:14,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2023-04-02 14:26:14,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1293, Invalid=6189, Unknown=0, NotChecked=0, Total=7482 [2023-04-02 14:26:14,207 INFO L87 Difference]: Start difference. First operand 191 states and 192 transitions. Second operand has 74 states, 74 states have (on average 1.7702702702702702) internal successors, (131), 74 states have internal predecessors, (131), 47 states have call successors, (48), 3 states have call predecessors, (48), 2 states have return successors, (46), 46 states have call predecessors, (46), 46 states have call successors, (46) [2023-04-02 14:26:14,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:26:14,898 INFO L93 Difference]: Finished difference Result 360 states and 363 transitions. [2023-04-02 14:26:14,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2023-04-02 14:26:14,898 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 1.7702702702702702) internal successors, (131), 74 states have internal predecessors, (131), 47 states have call successors, (48), 3 states have call predecessors, (48), 2 states have return successors, (46), 46 states have call predecessors, (46), 46 states have call successors, (46) Word has length 188 [2023-04-02 14:26:14,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:26:14,899 INFO L225 Difference]: With dead ends: 360 [2023-04-02 14:26:14,899 INFO L226 Difference]: Without dead ends: 196 [2023-04-02 14:26:14,901 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 633 GetRequests, 482 SyntacticMatches, 44 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4897 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2162, Invalid=9610, Unknown=0, NotChecked=0, Total=11772 [2023-04-02 14:26:14,901 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 104 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 743 mSolverCounterSat, 183 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 926 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 183 IncrementalHoareTripleChecker+Valid, 743 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 14:26:14,901 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [127 Valid, 91 Invalid, 926 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [183 Valid, 743 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 14:26:14,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2023-04-02 14:26:14,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 192. [2023-04-02 14:26:14,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 142 states have (on average 1.0140845070422535) internal successors, (144), 143 states have internal predecessors, (144), 25 states have call successors, (25), 25 states have call predecessors, (25), 24 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) [2023-04-02 14:26:14,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 193 transitions. [2023-04-02 14:26:14,945 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 193 transitions. Word has length 188 [2023-04-02 14:26:14,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:26:14,946 INFO L495 AbstractCegarLoop]: Abstraction has 192 states and 193 transitions. [2023-04-02 14:26:14,946 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 1.7702702702702702) internal successors, (131), 74 states have internal predecessors, (131), 47 states have call successors, (48), 3 states have call predecessors, (48), 2 states have return successors, (46), 46 states have call predecessors, (46), 46 states have call successors, (46) [2023-04-02 14:26:14,946 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 193 transitions. [2023-04-02 14:26:14,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2023-04-02 14:26:14,947 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:26:14,947 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:26:14,954 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2023-04-02 14:26:15,154 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,42 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:26:15,154 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:26:15,154 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:26:15,155 INFO L85 PathProgramCache]: Analyzing trace with hash -195624999, now seen corresponding path program 41 times [2023-04-02 14:26:15,155 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:26:15,155 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [891182152] [2023-04-02 14:26:15,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:26:15,155 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:26:15,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat