/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-examples/standard_sentinel-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 14:13:04,093 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 14:13:04,094 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 14:13:04,118 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 14:13:04,118 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 14:13:04,119 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 14:13:04,119 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 14:13:04,121 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 14:13:04,122 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 14:13:04,122 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 14:13:04,123 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 14:13:04,124 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 14:13:04,124 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 14:13:04,125 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 14:13:04,125 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 14:13:04,126 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 14:13:04,127 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 14:13:04,127 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 14:13:04,129 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 14:13:04,130 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 14:13:04,131 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 14:13:04,132 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 14:13:04,133 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 14:13:04,133 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 14:13:04,136 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-04-02 14:13:04,138 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 14:13:04,138 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 14:13:04,138 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 14:13:04,139 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 14:13:04,139 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 14:13:04,140 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 14:13:04,140 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 14:13:04,140 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 14:13:04,140 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 14:13:04,141 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 14:13:04,141 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 14:13:04,142 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 14:13:04,155 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 14:13:04,155 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 14:13:04,156 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 14:13:04,156 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 14:13:04,156 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 14:13:04,156 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 14:13:04,156 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 14:13:04,157 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 14:13:04,157 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 14:13:04,157 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 14:13:04,157 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 14:13:04,157 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 14:13:04,157 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 14:13:04,157 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 14:13:04,157 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 14:13:04,158 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 14:13:04,158 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 14:13:04,158 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 14:13:04,158 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 14:13:04,158 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 14:13:04,158 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 14:13:04,158 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 14:13:04,159 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 14:13:04,159 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 14:13:04,159 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 14:13:04,159 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 14:13:04,159 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 14:13:04,159 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 14:13:04,159 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 14:13:04,159 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 14:13:04,159 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 14:13:04,160 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 14:13:04,160 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 14:13:04,160 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 14:13:04,160 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 14:13:04,160 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 14:13:04,160 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 14:13:04,160 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 14:13:04,160 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 14:13:04,160 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 14:13:04,160 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 14:13:04,161 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 14:13:04,281 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 14:13:04,296 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 14:13:04,297 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 14:13:04,298 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 14:13:04,298 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 14:13:04,299 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_sentinel-2.i [2023-04-02 14:13:05,115 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 14:13:05,288 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 14:13:05,289 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_sentinel-2.i [2023-04-02 14:13:05,292 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/972609c5b/fa510106add746b9a60da7c0520f9df2/FLAG9caa79ba0 [2023-04-02 14:13:05,307 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/972609c5b/fa510106add746b9a60da7c0520f9df2 [2023-04-02 14:13:05,308 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 14:13:05,310 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 14:13:05,313 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 14:13:05,314 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 14:13:05,316 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 14:13:05,316 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 02:13:05" (1/1) ... [2023-04-02 14:13:05,317 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4572cc32 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:13:05, skipping insertion in model container [2023-04-02 14:13:05,317 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 02:13:05" (1/1) ... [2023-04-02 14:13:05,322 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 14:13:05,331 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 14:13:05,415 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-examples/standard_sentinel-2.i[852,865] [2023-04-02 14:13:05,425 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 14:13:05,431 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 14:13:05,437 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-examples/standard_sentinel-2.i[852,865] [2023-04-02 14:13:05,440 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 14:13:05,448 INFO L208 MainTranslator]: Completed translation [2023-04-02 14:13:05,448 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:13:05 WrapperNode [2023-04-02 14:13:05,448 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 14:13:05,449 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 14:13:05,449 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 14:13:05,449 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 14:13:05,455 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:13:05" (1/1) ... [2023-04-02 14:13:05,455 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:13:05" (1/1) ... [2023-04-02 14:13:05,460 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:13:05" (1/1) ... [2023-04-02 14:13:05,461 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:13:05" (1/1) ... [2023-04-02 14:13:05,464 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:13:05" (1/1) ... [2023-04-02 14:13:05,466 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:13:05" (1/1) ... [2023-04-02 14:13:05,467 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:13:05" (1/1) ... [2023-04-02 14:13:05,467 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:13:05" (1/1) ... [2023-04-02 14:13:05,468 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 14:13:05,469 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 14:13:05,469 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 14:13:05,469 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 14:13:05,470 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:13:05" (1/1) ... [2023-04-02 14:13:05,474 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 14:13:05,480 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:13:05,493 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 14:13:05,506 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 14:13:05,521 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 14:13:05,521 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 14:13:05,521 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 14:13:05,521 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 14:13:05,521 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 14:13:05,521 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 14:13:05,521 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 14:13:05,521 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-02 14:13:05,522 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-02 14:13:05,522 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 14:13:05,522 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 14:13:05,522 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 14:13:05,522 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 14:13:05,522 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 14:13:05,522 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-02 14:13:05,522 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 14:13:05,522 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 14:13:05,522 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 14:13:05,522 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 14:13:05,522 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 14:13:05,522 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 14:13:05,590 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 14:13:05,591 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 14:13:05,755 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 14:13:05,789 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 14:13:05,789 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-04-02 14:13:05,790 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 02:13:05 BoogieIcfgContainer [2023-04-02 14:13:05,790 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 14:13:05,792 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 14:13:05,792 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 14:13:05,799 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 14:13:05,799 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 02:13:05" (1/3) ... [2023-04-02 14:13:05,799 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62cc037d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 02:13:05, skipping insertion in model container [2023-04-02 14:13:05,799 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:13:05" (2/3) ... [2023-04-02 14:13:05,799 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62cc037d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 02:13:05, skipping insertion in model container [2023-04-02 14:13:05,799 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 02:13:05" (3/3) ... [2023-04-02 14:13:05,800 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_sentinel-2.i [2023-04-02 14:13:05,811 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 14:13:05,811 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 14:13:05,852 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 14:13:05,857 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;@2fc7e2fe, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 14:13:05,858 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 14:13:05,860 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.5) internal successors, (18), 14 states have internal predecessors, (18), 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 14:13:05,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-04-02 14:13:05,865 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:13:05,865 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:13:05,866 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:13:05,872 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:13:05,872 INFO L85 PathProgramCache]: Analyzing trace with hash -642280278, now seen corresponding path program 1 times [2023-04-02 14:13:05,878 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:13:05,878 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205527929] [2023-04-02 14:13:05,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:13:05,879 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:13:05,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:13:06,032 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 14:13:06,032 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:13:06,032 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205527929] [2023-04-02 14:13:06,033 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [205527929] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 14:13:06,033 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 14:13:06,033 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-04-02 14:13:06,034 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700013480] [2023-04-02 14:13:06,034 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 14:13:06,037 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-04-02 14:13:06,037 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:13:06,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-04-02 14:13:06,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-04-02 14:13:06,056 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.5) internal successors, (18), 14 states have internal predecessors, (18), 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 2 states, 2 states have (on average 4.0) internal successors, (8), 2 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 14:13:06,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:13:06,073 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2023-04-02 14:13:06,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-04-02 14:13:06,074 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 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 14:13:06,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:13:06,078 INFO L225 Difference]: With dead ends: 31 [2023-04-02 14:13:06,078 INFO L226 Difference]: Without dead ends: 14 [2023-04-02 14:13:06,080 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-04-02 14:13:06,085 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:13:06,086 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:13:06,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2023-04-02 14:13:06,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2023-04-02 14:13:06,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 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 14:13:06,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2023-04-02 14:13:06,110 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 12 [2023-04-02 14:13:06,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:13:06,111 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2023-04-02 14:13:06,111 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 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 14:13:06,112 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2023-04-02 14:13:06,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-04-02 14:13:06,113 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:13:06,113 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:13:06,114 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 14:13:06,114 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:13:06,115 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:13:06,115 INFO L85 PathProgramCache]: Analyzing trace with hash 1338210026, now seen corresponding path program 1 times [2023-04-02 14:13:06,115 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:13:06,116 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [595337561] [2023-04-02 14:13:06,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:13:06,116 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:13:06,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:13:06,211 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 14:13:06,211 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:13:06,211 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [595337561] [2023-04-02 14:13:06,211 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [595337561] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 14:13:06,211 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 14:13:06,211 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-02 14:13:06,211 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826632239] [2023-04-02 14:13:06,212 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 14:13:06,213 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 14:13:06,213 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:13:06,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 14:13:06,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 14:13:06,214 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 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 14:13:06,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:13:06,223 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2023-04-02 14:13:06,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 14:13:06,224 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 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 13 [2023-04-02 14:13:06,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:13:06,224 INFO L225 Difference]: With dead ends: 23 [2023-04-02 14:13:06,224 INFO L226 Difference]: Without dead ends: 15 [2023-04-02 14:13:06,225 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 14:13:06,226 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:13:06,226 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:13:06,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-04-02 14:13:06,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-04-02 14:13:06,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 3 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 14:13:06,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2023-04-02 14:13:06,229 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2023-04-02 14:13:06,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:13:06,229 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2023-04-02 14:13:06,229 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 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 14:13:06,229 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2023-04-02 14:13:06,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-04-02 14:13:06,230 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:13:06,230 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:13:06,230 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-02 14:13:06,230 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:13:06,230 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:13:06,231 INFO L85 PathProgramCache]: Analyzing trace with hash 1523423182, now seen corresponding path program 1 times [2023-04-02 14:13:06,231 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:13:06,231 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723812967] [2023-04-02 14:13:06,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:13:06,231 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:13:06,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:13:06,288 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 14:13:06,288 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:13:06,288 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723812967] [2023-04-02 14:13:06,288 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [723812967] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:13:06,288 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [396190329] [2023-04-02 14:13:06,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:13:06,289 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:13:06,289 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:13:06,296 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 14:13:06,302 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 14:13:06,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:13:06,366 INFO L262 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-02 14:13:06,369 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:13:06,399 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 14:13:06,400 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:13:06,426 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 14:13:06,427 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [396190329] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:13:06,430 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1398606378] [2023-04-02 14:13:06,444 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 14:13:06,445 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:13:06,447 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:13:06,450 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:13:06,450 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:13:06,534 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:13:06,774 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 67 for LOIs [2023-04-02 14:13:06,800 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:13:06,805 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:13:07,478 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1398606378] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 14:13:07,479 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:13:07,479 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [4, 4, 4] total 18 [2023-04-02 14:13:07,479 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882334823] [2023-04-02 14:13:07,479 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 14:13:07,480 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-04-02 14:13:07,480 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:13:07,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-04-02 14:13:07,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2023-04-02 14:13:07,481 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 13 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 3 states have call successors, (3), 3 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 14:13:14,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:13:14,245 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2023-04-02 14:13:14,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-02 14:13:14,246 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2023-04-02 14:13:14,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:13:14,246 INFO L225 Difference]: With dead ends: 22 [2023-04-02 14:13:14,246 INFO L226 Difference]: Without dead ends: 17 [2023-04-02 14:13:14,247 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=142, Invalid=560, Unknown=0, NotChecked=0, Total=702 [2023-04-02 14:13:14,248 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 41 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:13:14,248 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 5 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:13:14,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-04-02 14:13:14,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-04-02 14:13:14,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 3 states have call successors, (3), 3 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 14:13:14,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2023-04-02 14:13:14,254 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 14 [2023-04-02 14:13:14,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:13:14,254 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2023-04-02 14:13:14,254 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 3 states have call successors, (3), 3 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 14:13:14,254 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2023-04-02 14:13:14,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-04-02 14:13:14,254 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:13:14,255 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:13:14,263 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 14:13:14,461 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:13:14,462 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:13:14,462 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:13:14,462 INFO L85 PathProgramCache]: Analyzing trace with hash 297868947, now seen corresponding path program 1 times [2023-04-02 14:13:14,462 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:13:14,464 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1041774818] [2023-04-02 14:13:14,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:13:14,464 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:13:14,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:13:14,515 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 14:13:14,515 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:13:14,515 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1041774818] [2023-04-02 14:13:14,515 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1041774818] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:13:14,515 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1207864813] [2023-04-02 14:13:14,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:13:14,516 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:13:14,516 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:13:14,517 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 14:13:14,519 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 14:13:14,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:13:14,551 INFO L262 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-02 14:13:14,552 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:13:14,557 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 14:13:14,557 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:13:14,570 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 14:13:14,570 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1207864813] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:13:14,570 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1168313267] [2023-04-02 14:13:14,571 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 14:13:14,571 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:13:14,571 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:13:14,572 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:13:14,572 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:13:14,586 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:13:14,709 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2023-04-02 14:13:14,721 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:13:14,724 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:13:15,230 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '428#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:13:15,230 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:13:15,230 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:13:15,231 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-02 14:13:15,231 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847032114] [2023-04-02 14:13:15,231 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:13:15,231 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-02 14:13:15,231 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:13:15,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-02 14:13:15,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2023-04-02 14:13:15,232 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 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 14:13:15,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:13:15,243 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2023-04-02 14:13:15,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 14:13:15,244 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 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 16 [2023-04-02 14:13:15,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:13:15,244 INFO L225 Difference]: With dead ends: 30 [2023-04-02 14:13:15,244 INFO L226 Difference]: Without dead ends: 20 [2023-04-02 14:13:15,245 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 33 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2023-04-02 14:13:15,245 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:13:15,246 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:13:15,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-04-02 14:13:15,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-04-02 14:13:15,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 3 states have call successors, (3), 3 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 14:13:15,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2023-04-02 14:13:15,252 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 16 [2023-04-02 14:13:15,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:13:15,252 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2023-04-02 14:13:15,252 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 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 14:13:15,252 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2023-04-02 14:13:15,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-04-02 14:13:15,252 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:13:15,252 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:13:15,259 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 14:13:15,457 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,SelfDestructingSolverStorable3 [2023-04-02 14:13:15,457 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:13:15,457 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:13:15,457 INFO L85 PathProgramCache]: Analyzing trace with hash 1917616047, now seen corresponding path program 2 times [2023-04-02 14:13:15,457 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:13:15,458 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [673346731] [2023-04-02 14:13:15,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:13:15,458 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:13:15,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:13:15,571 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 14:13:15,571 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:13:15,571 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [673346731] [2023-04-02 14:13:15,572 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [673346731] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:13:15,572 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2084474602] [2023-04-02 14:13:15,572 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:13:15,572 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:13:15,572 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:13:15,573 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 14:13:15,596 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 14:13:15,636 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-02 14:13:15,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:13:15,636 INFO L262 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 16 conjunts are in the unsatisfiable core [2023-04-02 14:13:15,638 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:13:15,655 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 14:13:15,671 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 14:13:15,671 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 23 treesize of output 15 [2023-04-02 14:13:15,715 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 14:13:15,715 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:13:15,785 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 14:13:15,785 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2084474602] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:13:15,785 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [382213875] [2023-04-02 14:13:15,786 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 14:13:15,786 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:13:15,786 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:13:15,787 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:13:15,787 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:13:15,800 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:13:16,025 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2023-04-02 14:13:16,038 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:13:16,041 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:13:16,647 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '646#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:13:16,647 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:13:16,647 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:13:16,647 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 17 [2023-04-02 14:13:16,647 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869081259] [2023-04-02 14:13:16,648 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:13:16,648 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-02 14:13:16,648 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:13:16,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-02 14:13:16,649 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=618, Unknown=0, NotChecked=0, Total=702 [2023-04-02 14:13:16,649 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 15 states have internal predecessors, (31), 4 states have call successors, (5), 4 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 14:13:16,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:13:16,744 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2023-04-02 14:13:16,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-02 14:13:16,745 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 15 states have internal predecessors, (31), 4 states have call successors, (5), 4 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 19 [2023-04-02 14:13:16,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:13:16,745 INFO L225 Difference]: With dead ends: 39 [2023-04-02 14:13:16,745 INFO L226 Difference]: Without dead ends: 25 [2023-04-02 14:13:16,746 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=113, Invalid=817, Unknown=0, NotChecked=0, Total=930 [2023-04-02 14:13:16,747 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 6 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:13:16,747 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 50 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:13:16,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-04-02 14:13:16,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2023-04-02 14:13:16,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.1) internal successors, (22), 20 states have internal predecessors, (22), 3 states have call successors, (3), 3 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 14:13:16,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2023-04-02 14:13:16,752 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 19 [2023-04-02 14:13:16,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:13:16,752 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2023-04-02 14:13:16,753 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 15 states have internal predecessors, (31), 4 states have call successors, (5), 4 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 14:13:16,753 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2023-04-02 14:13:16,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-04-02 14:13:16,753 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:13:16,753 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:13:16,760 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-04-02 14:13:16,953 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:13:16,954 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:13:16,954 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:13:16,954 INFO L85 PathProgramCache]: Analyzing trace with hash 1049979741, now seen corresponding path program 3 times [2023-04-02 14:13:16,954 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:13:16,954 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1150597709] [2023-04-02 14:13:16,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:13:16,954 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:13:16,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:13:17,021 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 14:13:17,022 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:13:17,022 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1150597709] [2023-04-02 14:13:17,022 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1150597709] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:13:17,022 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [737994906] [2023-04-02 14:13:17,022 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:13:17,022 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:13:17,022 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:13:17,044 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 14:13:17,104 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 14:13:17,147 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:13:17,147 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:13:17,147 INFO L262 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 7 conjunts are in the unsatisfiable core [2023-04-02 14:13:17,148 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:13:17,160 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 14:13:17,160 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:13:17,219 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 14:13:17,220 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [737994906] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:13:17,220 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [804564467] [2023-04-02 14:13:17,221 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 14:13:17,221 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:13:17,221 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:13:17,222 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:13:17,222 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:13:17,235 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:13:17,375 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2023-04-02 14:13:17,384 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:13:17,385 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:13:17,901 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '923#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:13:17,901 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:13:17,901 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:13:17,901 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2023-04-02 14:13:17,901 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424072160] [2023-04-02 14:13:17,901 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:13:17,902 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-04-02 14:13:17,902 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:13:17,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-04-02 14:13:17,902 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=461, Unknown=0, NotChecked=0, Total=600 [2023-04-02 14:13:17,902 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 states have internal predecessors, (24), 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 14:13:17,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:13:17,934 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2023-04-02 14:13:17,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-02 14:13:17,935 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 states have internal predecessors, (24), 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 24 [2023-04-02 14:13:17,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:13:17,936 INFO L225 Difference]: With dead ends: 46 [2023-04-02 14:13:17,936 INFO L226 Difference]: Without dead ends: 32 [2023-04-02 14:13:17,936 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 51 SyntacticMatches, 5 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=139, Invalid=461, Unknown=0, NotChecked=0, Total=600 [2023-04-02 14:13:17,938 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:13:17,938 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:13:17,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-04-02 14:13:17,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2023-04-02 14:13:17,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 27 states have internal predecessors, (29), 3 states have call successors, (3), 3 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 14:13:17,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2023-04-02 14:13:17,947 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 24 [2023-04-02 14:13:17,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:13:17,947 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2023-04-02 14:13:17,947 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 states have internal predecessors, (24), 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 14:13:17,947 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2023-04-02 14:13:17,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-04-02 14:13:17,947 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:13:17,948 INFO L195 NwaCegarLoop]: trace histogram [12, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:13:17,970 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 14:13:18,167 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:13:18,167 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:13:18,168 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:13:18,168 INFO L85 PathProgramCache]: Analyzing trace with hash 331303289, now seen corresponding path program 4 times [2023-04-02 14:13:18,168 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:13:18,168 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902219358] [2023-04-02 14:13:18,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:13:18,168 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:13:18,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:13:18,460 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 14:13:18,461 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:13:18,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902219358] [2023-04-02 14:13:18,461 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [902219358] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:13:18,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1348100043] [2023-04-02 14:13:18,461 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:13:18,461 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:13:18,461 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:13:18,463 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 14:13:18,464 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 14:13:18,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:13:18,509 INFO L262 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 14 conjunts are in the unsatisfiable core [2023-04-02 14:13:18,510 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:13:18,530 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 14:13:18,530 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:13:18,689 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 14:13:18,689 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1348100043] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:13:18,689 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1957987281] [2023-04-02 14:13:18,690 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 14:13:18,691 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:13:18,691 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:13:18,691 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:13:18,691 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:13:18,718 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:13:18,829 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2023-04-02 14:13:18,840 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:13:18,861 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:13:19,519 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1275#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:13:19,520 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:13:19,520 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:13:19,520 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2023-04-02 14:13:19,520 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967038929] [2023-04-02 14:13:19,520 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:13:19,520 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-04-02 14:13:19,520 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:13:19,521 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-04-02 14:13:19,521 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=440, Invalid=1042, Unknown=0, NotChecked=0, Total=1482 [2023-04-02 14:13:19,521 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 29 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 29 states have internal predecessors, (38), 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 14:13:19,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:13:19,558 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2023-04-02 14:13:19,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-04-02 14:13:19,559 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 29 states have internal predecessors, (38), 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 31 [2023-04-02 14:13:19,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:13:19,559 INFO L225 Difference]: With dead ends: 60 [2023-04-02 14:13:19,559 INFO L226 Difference]: Without dead ends: 46 [2023-04-02 14:13:19,560 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 65 SyntacticMatches, 5 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 648 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=440, Invalid=1042, Unknown=0, NotChecked=0, Total=1482 [2023-04-02 14:13:19,560 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:13:19,560 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 45 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:13:19,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-04-02 14:13:19,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2023-04-02 14:13:19,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.048780487804878) internal successors, (43), 41 states have internal predecessors, (43), 3 states have call successors, (3), 3 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 14:13:19,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2023-04-02 14:13:19,569 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 31 [2023-04-02 14:13:19,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:13:19,569 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2023-04-02 14:13:19,569 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 29 states have internal predecessors, (38), 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 14:13:19,569 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2023-04-02 14:13:19,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-04-02 14:13:19,570 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:13:19,570 INFO L195 NwaCegarLoop]: trace histogram [26, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:13:19,577 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 14:13:19,775 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:13:19,775 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:13:19,775 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:13:19,775 INFO L85 PathProgramCache]: Analyzing trace with hash -1551003399, now seen corresponding path program 5 times [2023-04-02 14:13:19,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:13:19,775 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1935478111] [2023-04-02 14:13:19,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:13:19,776 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:13:19,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:13:20,262 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 14:13:20,262 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:13:20,263 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1935478111] [2023-04-02 14:13:20,263 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1935478111] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:13:20,263 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [900219014] [2023-04-02 14:13:20,263 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:13:20,263 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:13:20,263 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:13:20,264 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 14:13:20,266 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 14:13:20,334 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-02 14:13:20,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:13:20,335 INFO L262 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 26 conjunts are in the unsatisfiable core [2023-04-02 14:13:20,336 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:13:20,340 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 14:13:20,496 INFO L321 Elim1Store]: treesize reduction 8, result has 80.5 percent of original size [2023-04-02 14:13:20,496 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 41 treesize of output 47 [2023-04-02 14:13:20,618 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2023-04-02 14:13:20,619 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:13:20,897 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2023-04-02 14:13:20,897 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [900219014] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:13:20,897 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1845736062] [2023-04-02 14:13:20,899 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 14:13:20,899 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:13:20,899 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:13:20,899 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:13:20,899 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:13:20,908 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:13:21,047 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2023-04-02 14:13:21,058 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:13:21,060 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:13:22,092 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1785#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:13:22,092 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:13:22,092 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:13:22,092 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 11, 11] total 47 [2023-04-02 14:13:22,093 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791369369] [2023-04-02 14:13:22,093 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:13:22,093 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2023-04-02 14:13:22,093 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:13:22,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2023-04-02 14:13:22,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=512, Invalid=2680, Unknown=0, NotChecked=0, Total=3192 [2023-04-02 14:13:22,095 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand has 47 states, 47 states have (on average 1.297872340425532) internal successors, (61), 45 states have internal predecessors, (61), 4 states have call successors, (5), 4 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 14:13:22,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:13:22,681 INFO L93 Difference]: Finished difference Result 75 states and 81 transitions. [2023-04-02 14:13:22,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2023-04-02 14:13:22,681 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.297872340425532) internal successors, (61), 45 states have internal predecessors, (61), 4 states have call successors, (5), 4 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 45 [2023-04-02 14:13:22,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:13:22,683 INFO L225 Difference]: With dead ends: 75 [2023-04-02 14:13:22,683 INFO L226 Difference]: Without dead ends: 55 [2023-04-02 14:13:22,684 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 103 SyntacticMatches, 5 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1247 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=601, Invalid=3559, Unknown=0, NotChecked=0, Total=4160 [2023-04-02 14:13:22,684 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 14 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 243 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:13:22,685 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 99 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 243 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:13:22,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2023-04-02 14:13:22,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2023-04-02 14:13:22,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.04) internal successors, (52), 50 states have internal predecessors, (52), 3 states have call successors, (3), 3 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 14:13:22,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2023-04-02 14:13:22,698 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 45 [2023-04-02 14:13:22,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:13:22,699 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2023-04-02 14:13:22,699 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.297872340425532) internal successors, (61), 45 states have internal predecessors, (61), 4 states have call successors, (5), 4 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 14:13:22,699 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2023-04-02 14:13:22,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-04-02 14:13:22,700 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:13:22,700 INFO L195 NwaCegarLoop]: trace histogram [27, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:13:22,707 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-04-02 14:13:22,904 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:13:22,905 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:13:22,905 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:13:22,905 INFO L85 PathProgramCache]: Analyzing trace with hash -2052108687, now seen corresponding path program 6 times [2023-04-02 14:13:22,905 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:13:22,905 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1468587166] [2023-04-02 14:13:22,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:13:22,905 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:13:22,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:13:23,365 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-04-02 14:13:23,365 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:13:23,365 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1468587166] [2023-04-02 14:13:23,365 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1468587166] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:13:23,366 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [873311703] [2023-04-02 14:13:23,366 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:13:23,366 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:13:23,366 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:13:23,367 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 14:13:23,369 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 14:13:23,459 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:13:23,459 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:13:23,460 INFO L262 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 29 conjunts are in the unsatisfiable core [2023-04-02 14:13:23,462 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:13:23,505 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-04-02 14:13:23,505 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:13:24,251 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-04-02 14:13:24,251 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [873311703] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:13:24,251 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [482458659] [2023-04-02 14:13:24,253 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 14:13:24,253 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:13:24,253 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:13:24,253 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:13:24,253 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:13:24,263 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:13:24,360 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2023-04-02 14:13:24,369 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:13:24,370 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:13:25,424 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2416#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:13:25,424 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:13:25,425 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:13:25,425 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 59 [2023-04-02 14:13:25,427 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192040515] [2023-04-02 14:13:25,427 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:13:25,428 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2023-04-02 14:13:25,428 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:13:25,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2023-04-02 14:13:25,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1745, Invalid=2947, Unknown=0, NotChecked=0, Total=4692 [2023-04-02 14:13:25,429 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand has 59 states, 59 states have (on average 1.152542372881356) internal successors, (68), 59 states have internal predecessors, (68), 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 14:13:25,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:13:25,507 INFO L93 Difference]: Finished difference Result 106 states and 136 transitions. [2023-04-02 14:13:25,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2023-04-02 14:13:25,507 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.152542372881356) internal successors, (68), 59 states have internal predecessors, (68), 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 54 [2023-04-02 14:13:25,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:13:25,510 INFO L225 Difference]: With dead ends: 106 [2023-04-02 14:13:25,510 INFO L226 Difference]: Without dead ends: 84 [2023-04-02 14:13:25,511 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 115 SyntacticMatches, 9 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1723 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1745, Invalid=2947, Unknown=0, NotChecked=0, Total=4692 [2023-04-02 14:13:25,512 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:13:25,512 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:13:25,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2023-04-02 14:13:25,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2023-04-02 14:13:25,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 79 states have (on average 1.0253164556962024) internal successors, (81), 79 states have internal predecessors, (81), 3 states have call successors, (3), 3 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 14:13:25,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2023-04-02 14:13:25,532 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 54 [2023-04-02 14:13:25,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:13:25,532 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2023-04-02 14:13:25,532 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.152542372881356) internal successors, (68), 59 states have internal predecessors, (68), 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 14:13:25,532 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2023-04-02 14:13:25,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2023-04-02 14:13:25,535 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:13:25,535 INFO L195 NwaCegarLoop]: trace histogram [56, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:13:25,542 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 14:13:25,740 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:13:25,741 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:13:25,741 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:13:25,741 INFO L85 PathProgramCache]: Analyzing trace with hash 945351949, now seen corresponding path program 7 times [2023-04-02 14:13:25,741 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:13:25,741 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1199741519] [2023-04-02 14:13:25,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:13:25,741 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:13:25,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:13:28,045 INFO L134 CoverageAnalysis]: Checked inductivity of 1652 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-04-02 14:13:28,045 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:13:28,045 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1199741519] [2023-04-02 14:13:28,045 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1199741519] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:13:28,045 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [641341977] [2023-04-02 14:13:28,045 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:13:28,046 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:13:28,046 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:13:28,046 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 14:13:28,049 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 14:13:28,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:13:28,206 INFO L262 TraceCheckSpWp]: Trace formula consists of 617 conjuncts, 58 conjunts are in the unsatisfiable core [2023-04-02 14:13:28,210 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:13:28,287 INFO L134 CoverageAnalysis]: Checked inductivity of 1652 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-04-02 14:13:28,287 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:13:31,139 INFO L134 CoverageAnalysis]: Checked inductivity of 1652 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-04-02 14:13:31,140 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [641341977] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:13:31,140 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2055723122] [2023-04-02 14:13:31,141 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 14:13:31,141 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:13:31,141 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:13:31,141 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:13:31,141 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:13:31,155 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:13:31,270 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2023-04-02 14:13:31,278 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:13:31,279 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:13:32,701 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3380#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:13:32,701 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:13:32,701 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:13:32,702 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 117 [2023-04-02 14:13:32,702 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369620652] [2023-04-02 14:13:32,702 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:13:32,703 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 117 states [2023-04-02 14:13:32,703 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:13:32,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2023-04-02 14:13:32,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6820, Invalid=9182, Unknown=0, NotChecked=0, Total=16002 [2023-04-02 14:13:32,709 INFO L87 Difference]: Start difference. First operand 84 states and 85 transitions. Second operand has 117 states, 117 states have (on average 1.0769230769230769) internal successors, (126), 117 states have internal predecessors, (126), 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 14:13:32,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:13:32,915 INFO L93 Difference]: Finished difference Result 164 states and 223 transitions. [2023-04-02 14:13:32,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2023-04-02 14:13:32,915 INFO L78 Accepts]: Start accepts. Automaton has has 117 states, 117 states have (on average 1.0769230769230769) internal successors, (126), 117 states have internal predecessors, (126), 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 83 [2023-04-02 14:13:32,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:13:32,917 INFO L225 Difference]: With dead ends: 164 [2023-04-02 14:13:32,917 INFO L226 Difference]: Without dead ends: 142 [2023-04-02 14:13:32,920 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 173 SyntacticMatches, 9 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3492 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=6820, Invalid=9182, Unknown=0, NotChecked=0, Total=16002 [2023-04-02 14:13:32,920 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:13:32,920 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 78 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:13:32,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2023-04-02 14:13:32,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2023-04-02 14:13:32,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 137 states have (on average 1.0145985401459854) internal successors, (139), 137 states have internal predecessors, (139), 3 states have call successors, (3), 3 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 14:13:32,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 143 transitions. [2023-04-02 14:13:32,955 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 143 transitions. Word has length 83 [2023-04-02 14:13:32,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:13:32,956 INFO L495 AbstractCegarLoop]: Abstraction has 142 states and 143 transitions. [2023-04-02 14:13:32,956 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 117 states, 117 states have (on average 1.0769230769230769) internal successors, (126), 117 states have internal predecessors, (126), 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 14:13:32,956 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 143 transitions. [2023-04-02 14:13:32,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2023-04-02 14:13:32,962 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:13:32,963 INFO L195 NwaCegarLoop]: trace histogram [114, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:13:32,987 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 14:13:33,168 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,SelfDestructingSolverStorable9 [2023-04-02 14:13:33,168 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:13:33,169 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:13:33,169 INFO L85 PathProgramCache]: Analyzing trace with hash -838498419, now seen corresponding path program 8 times [2023-04-02 14:13:33,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:13:33,169 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [434856585] [2023-04-02 14:13:33,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:13:33,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:13:33,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:13:37,543 INFO L134 CoverageAnalysis]: Checked inductivity of 6611 backedges. 0 proven. 6555 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-04-02 14:13:37,544 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:13:37,544 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [434856585] [2023-04-02 14:13:37,544 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [434856585] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:13:37,544 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1784644380] [2023-04-02 14:13:37,544 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:13:37,544 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:13:37,544 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:13:37,545 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 14:13:37,547 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 14:13:37,855 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2023-04-02 14:13:37,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:13:37,857 INFO L262 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 62 conjunts are in the unsatisfiable core [2023-04-02 14:13:37,860 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:13:38,022 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 14:13:38,917 INFO L321 Elim1Store]: treesize reduction 24, result has 77.1 percent of original size [2023-04-02 14:13:38,917 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 15 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 67 treesize of output 111 [2023-04-02 14:13:39,201 INFO L134 CoverageAnalysis]: Checked inductivity of 6611 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 6105 trivial. 0 not checked. [2023-04-02 14:13:39,202 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:13:40,744 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 113 treesize of output 99 [2023-04-02 14:13:40,751 INFO L321 Elim1Store]: treesize reduction 48, result has 2.0 percent of original size [2023-04-02 14:13:40,752 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 106 treesize of output 1 [2023-04-02 14:13:40,757 INFO L134 CoverageAnalysis]: Checked inductivity of 6611 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 6555 trivial. 0 not checked. [2023-04-02 14:13:40,757 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1784644380] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:13:40,757 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [343361453] [2023-04-02 14:13:40,758 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 14:13:40,758 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:13:40,758 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:13:40,758 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:13:40,758 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:13:40,768 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:13:40,876 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2023-04-02 14:13:40,885 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:13:40,886 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:13:43,605 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4963#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:13:43,605 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:13:43,605 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:13:43,605 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [117, 24, 19] total 156 [2023-04-02 14:13:43,605 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206102432] [2023-04-02 14:13:43,605 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:13:43,606 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 156 states [2023-04-02 14:13:43,606 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:13:43,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 156 interpolants. [2023-04-02 14:13:43,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7532, Invalid=19858, Unknown=0, NotChecked=0, Total=27390 [2023-04-02 14:13:43,610 INFO L87 Difference]: Start difference. First operand 142 states and 143 transitions. Second operand has 156 states, 156 states have (on average 1.1025641025641026) internal successors, (172), 154 states have internal predecessors, (172), 4 states have call successors, (5), 4 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 14:13:51,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:13:51,733 INFO L93 Difference]: Finished difference Result 191 states and 201 transitions. [2023-04-02 14:13:51,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 149 states. [2023-04-02 14:13:51,733 INFO L78 Accepts]: Start accepts. Automaton has has 156 states, 156 states have (on average 1.1025641025641026) internal successors, (172), 154 states have internal predecessors, (172), 4 states have call successors, (5), 4 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 141 [2023-04-02 14:13:51,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:13:51,734 INFO L225 Difference]: With dead ends: 191 [2023-04-02 14:13:51,734 INFO L226 Difference]: Without dead ends: 159 [2023-04-02 14:13:51,739 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 667 GetRequests, 366 SyntacticMatches, 9 SemanticMatches, 292 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18713 ImplicationChecksByTransitivity, 15.1s TimeCoverageRelationStatistics Valid=21030, Invalid=65112, Unknown=0, NotChecked=0, Total=86142 [2023-04-02 14:13:51,739 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 77 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 740 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 748 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 740 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-02 14:13:51,739 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [77 Valid, 144 Invalid, 748 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 740 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-02 14:13:51,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2023-04-02 14:13:51,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2023-04-02 14:13:51,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 154 states have (on average 1.0129870129870129) internal successors, (156), 154 states have internal predecessors, (156), 3 states have call successors, (3), 3 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 14:13:51,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 160 transitions. [2023-04-02 14:13:51,776 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 160 transitions. Word has length 141 [2023-04-02 14:13:51,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:13:51,777 INFO L495 AbstractCegarLoop]: Abstraction has 159 states and 160 transitions. [2023-04-02 14:13:51,778 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 156 states, 156 states have (on average 1.1025641025641026) internal successors, (172), 154 states have internal predecessors, (172), 4 states have call successors, (5), 4 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 14:13:51,778 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 160 transitions. [2023-04-02 14:13:51,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2023-04-02 14:13:51,779 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:13:51,779 INFO L195 NwaCegarLoop]: trace histogram [115, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:13:51,788 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 14:13:51,985 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:13:51,986 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:13:51,986 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:13:51,986 INFO L85 PathProgramCache]: Analyzing trace with hash -1416477287, now seen corresponding path program 9 times [2023-04-02 14:13:51,986 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:13:51,986 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1423829534] [2023-04-02 14:13:51,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:13:51,986 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:13:52,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:13:57,386 INFO L134 CoverageAnalysis]: Checked inductivity of 6910 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2023-04-02 14:13:57,386 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:13:57,386 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1423829534] [2023-04-02 14:13:57,386 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1423829534] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:13:57,386 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1144503762] [2023-04-02 14:13:57,386 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:13:57,386 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:13:57,386 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:13:57,387 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 14:13:57,389 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 14:13:57,691 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:13:57,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:13:57,695 INFO L262 TraceCheckSpWp]: Trace formula consists of 1188 conjuncts, 117 conjunts are in the unsatisfiable core [2023-04-02 14:13:57,699 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:13:57,842 INFO L134 CoverageAnalysis]: Checked inductivity of 6910 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2023-04-02 14:13:57,842 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:14:09,838 INFO L134 CoverageAnalysis]: Checked inductivity of 6910 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2023-04-02 14:14:09,839 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1144503762] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:14:09,839 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1065549541] [2023-04-02 14:14:09,840 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 14:14:09,840 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:14:09,840 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:14:09,840 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:14:09,840 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:14:09,849 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:14:09,929 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2023-04-02 14:14:09,935 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:14:09,937 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:14:13,190 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7054#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:14:13,190 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:14:13,190 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:14:13,190 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [118, 118, 118] total 235 [2023-04-02 14:14:13,191 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589051989] [2023-04-02 14:14:13,191 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:14:13,191 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 235 states [2023-04-02 14:14:13,191 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:14:13,196 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 235 interpolants. [2023-04-02 14:14:13,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27529, Invalid=32251, Unknown=0, NotChecked=0, Total=59780 [2023-04-02 14:14:13,198 INFO L87 Difference]: Start difference. First operand 159 states and 160 transitions. Second operand has 235 states, 235 states have (on average 1.0382978723404255) internal successors, (244), 235 states have internal predecessors, (244), 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 14:14:13,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:14:13,610 INFO L93 Difference]: Finished difference Result 314 states and 432 transitions. [2023-04-02 14:14:13,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 234 states. [2023-04-02 14:14:13,610 INFO L78 Accepts]: Start accepts. Automaton has has 235 states, 235 states have (on average 1.0382978723404255) internal successors, (244), 235 states have internal predecessors, (244), 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 158 [2023-04-02 14:14:13,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:14:13,611 INFO L225 Difference]: With dead ends: 314 [2023-04-02 14:14:13,611 INFO L226 Difference]: Without dead ends: 276 [2023-04-02 14:14:13,613 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 331 SyntacticMatches, 17 SemanticMatches, 243 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9883 ImplicationChecksByTransitivity, 18.7s TimeCoverageRelationStatistics Valid=27529, Invalid=32251, Unknown=0, NotChecked=0, Total=59780 [2023-04-02 14:14:13,614 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:14:13,614 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 111 Invalid, 255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:14:13,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2023-04-02 14:14:13,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 276. [2023-04-02 14:14:13,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 276 states, 271 states have (on average 1.007380073800738) internal successors, (273), 271 states have internal predecessors, (273), 3 states have call successors, (3), 3 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 14:14:13,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 277 transitions. [2023-04-02 14:14:13,661 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 277 transitions. Word has length 158 [2023-04-02 14:14:13,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:14:13,661 INFO L495 AbstractCegarLoop]: Abstraction has 276 states and 277 transitions. [2023-04-02 14:14:13,661 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 235 states, 235 states have (on average 1.0382978723404255) internal successors, (244), 235 states have internal predecessors, (244), 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 14:14:13,661 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 277 transitions. [2023-04-02 14:14:13,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2023-04-02 14:14:13,663 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:14:13,663 INFO L195 NwaCegarLoop]: trace histogram [232, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:14:13,669 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 14:14:13,869 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,SelfDestructingSolverStorable11 [2023-04-02 14:14:13,869 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:14:13,869 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:14:13,869 INFO L85 PathProgramCache]: Analyzing trace with hash 2037341749, now seen corresponding path program 10 times [2023-04-02 14:14:13,870 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:14:13,870 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [787257130] [2023-04-02 14:14:13,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:14:13,870 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:14:14,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:14:32,605 INFO L134 CoverageAnalysis]: Checked inductivity of 27268 backedges. 0 proven. 27028 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2023-04-02 14:14:32,605 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:14:32,605 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [787257130] [2023-04-02 14:14:32,605 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [787257130] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:14:32,605 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [328153181] [2023-04-02 14:14:32,605 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:14:32,605 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:14:32,606 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:14:32,606 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 14:14:32,609 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 14:14:33,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:14:33,110 INFO L262 TraceCheckSpWp]: Trace formula consists of 2241 conjuncts, 234 conjunts are in the unsatisfiable core [2023-04-02 14:14:33,116 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:14:33,324 INFO L134 CoverageAnalysis]: Checked inductivity of 27268 backedges. 0 proven. 27028 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2023-04-02 14:14:33,324 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:15:07,531 INFO L134 CoverageAnalysis]: Checked inductivity of 27268 backedges. 0 proven. 27028 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2023-04-02 14:15:07,531 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [328153181] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:15:07,531 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [823855840] [2023-04-02 14:15:07,532 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 14:15:07,532 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:15:07,533 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:15:07,533 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:15:07,533 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:15:07,561 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:15:07,641 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2023-04-02 14:15:07,648 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:15:07,649 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:15:12,808 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10298#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:15:12,809 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:15:12,809 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:15:12,809 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [235, 235, 235] total 469 [2023-04-02 14:15:12,810 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225588141] [2023-04-02 14:15:12,810 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:15:12,811 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 469 states [2023-04-02 14:15:12,811 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:15:12,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 469 interpolants. [2023-04-02 14:15:12,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109780, Invalid=119182, Unknown=0, NotChecked=0, Total=228962 [2023-04-02 14:15:12,831 INFO L87 Difference]: Start difference. First operand 276 states and 277 transitions. Second operand has 469 states, 469 states have (on average 1.019189765458422) internal successors, (478), 469 states have internal predecessors, (478), 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 14:15:14,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:15:14,852 INFO L93 Difference]: Finished difference Result 548 states and 783 transitions. [2023-04-02 14:15:14,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 468 states. [2023-04-02 14:15:14,853 INFO L78 Accepts]: Start accepts. Automaton has has 469 states, 469 states have (on average 1.019189765458422) internal successors, (478), 469 states have internal predecessors, (478), 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 275 [2023-04-02 14:15:14,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:15:14,855 INFO L225 Difference]: With dead ends: 548 [2023-04-02 14:15:14,855 INFO L226 Difference]: Without dead ends: 510 [2023-04-02 14:15:14,862 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1059 GetRequests, 565 SyntacticMatches, 17 SemanticMatches, 477 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19828 ImplicationChecksByTransitivity, 50.5s TimeCoverageRelationStatistics Valid=109780, Invalid=119182, Unknown=0, NotChecked=0, Total=228962 [2023-04-02 14:15:14,862 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 486 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 487 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 486 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 14:15:14,862 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 100 Invalid, 487 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 486 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 14:15:14,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 510 states. [2023-04-02 14:15:14,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 510 to 510. [2023-04-02 14:15:14,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 510 states, 505 states have (on average 1.003960396039604) internal successors, (507), 505 states have internal predecessors, (507), 3 states have call successors, (3), 3 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 14:15:14,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 510 states to 510 states and 511 transitions. [2023-04-02 14:15:14,947 INFO L78 Accepts]: Start accepts. Automaton has 510 states and 511 transitions. Word has length 275 [2023-04-02 14:15:14,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:15:14,947 INFO L495 AbstractCegarLoop]: Abstraction has 510 states and 511 transitions. [2023-04-02 14:15:14,948 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 469 states, 469 states have (on average 1.019189765458422) internal successors, (478), 469 states have internal predecessors, (478), 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 14:15:14,948 INFO L276 IsEmpty]: Start isEmpty. Operand 510 states and 511 transitions. [2023-04-02 14:15:14,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 510 [2023-04-02 14:15:14,953 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:15:14,953 INFO L195 NwaCegarLoop]: trace histogram [466, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:15:14,963 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-04-02 14:15:15,161 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,SelfDestructingSolverStorable12 [2023-04-02 14:15:15,161 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:15:15,161 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:15:15,162 INFO L85 PathProgramCache]: Analyzing trace with hash -1345895243, now seen corresponding path program 11 times [2023-04-02 14:15:15,162 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:15:15,162 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [661789275] [2023-04-02 14:15:15,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:15:15,162 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:15:15,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:16:40,203 INFO L134 CoverageAnalysis]: Checked inductivity of 109051 backedges. 0 proven. 108811 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2023-04-02 14:16:40,203 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:16:40,203 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [661789275] [2023-04-02 14:16:40,203 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [661789275] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:16:40,203 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1624842384] [2023-04-02 14:16:40,203 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:16:40,203 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:16:40,204 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:16:40,206 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 14:16:40,206 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 14:16:48,222 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2023-04-02 14:16:48,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:16:48,236 INFO L262 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 134 conjunts are in the unsatisfiable core [2023-04-02 14:16:48,243 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:16:49,044 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 14:16:58,288 INFO L321 Elim1Store]: treesize reduction 60, result has 53.5 percent of original size [2023-04-02 14:16:58,288 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 17 select indices, 17 select index equivalence classes, 120 disjoint index pairs (out of 136 index pairs), introduced 17 new quantified variables, introduced 136 case distinctions, treesize of input 137 treesize of output 135 [2023-04-02 14:16:59,017 WARN L667 sPolynomialRelations]: Constructing 32768(two to the power of 15 dual juncts. [2023-04-02 14:17:00,226 INFO L134 CoverageAnalysis]: Checked inductivity of 109051 backedges. 0 proven. 4855 refuted. 0 times theorem prover too weak. 104196 trivial. 0 not checked. [2023-04-02 14:17:00,226 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:17:11,865 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 256 treesize of output 224 [2023-04-02 14:17:11,874 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 14:17:11,875 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 16 select indices, 16 select index equivalence classes, 0 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 120 case distinctions, treesize of input 241 treesize of output 1 [2023-04-02 14:17:11,885 INFO L134 CoverageAnalysis]: Checked inductivity of 109051 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 108811 trivial. 0 not checked. [2023-04-02 14:17:11,885 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1624842384] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:17:11,885 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [597538260] [2023-04-02 14:17:11,886 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 14:17:11,886 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:17:11,886 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:17:11,886 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:17:11,886 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:17:11,894 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:17:11,973 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2023-04-02 14:17:11,980 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:17:11,981 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:17:25,449 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15964#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:17:25,450 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:17:25,450 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:17:25,450 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [469, 49, 37] total 551 [2023-04-02 14:17:25,450 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617352765] [2023-04-02 14:17:25,450 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:17:25,464 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 551 states [2023-04-02 14:17:25,465 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:17:25,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 551 interpolants. [2023-04-02 14:17:25,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115425, Invalid=198735, Unknown=0, NotChecked=0, Total=314160 [2023-04-02 14:17:25,504 INFO L87 Difference]: Start difference. First operand 510 states and 511 transitions. Second operand has 551 states, 548 states have (on average 1.0273722627737227) internal successors, (563), 549 states have internal predecessors, (563), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2)