/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/array-lopstr16/flag_loopdep_simple.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 15:19:50,509 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 15:19:50,511 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 15:19:50,528 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2023-04-02 15:19:50,533 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 15:19:50,534 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 15:19:50,535 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 15:19:50,535 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 15:19:50,536 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 15:19:50,536 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 15:19:50,537 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 15:19:50,538 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 15:19:50,539 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 15:19:50,540 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 15:19:50,540 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 15:19:50,541 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 15:19:50,542 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-04-02 15:19:50,544 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 15:19:50,545 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 15:19:50,545 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 15:19:50,545 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 15:19:50,546 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 15:19:50,546 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 15:19:50,546 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 15:19:50,547 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 15:19:50,547 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 15:19:50,547 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 15:19:50,548 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 15:19:50,550 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-02 15:19:50,571 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 15:19:50,571 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 15:19:50,571 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 15:19:50,572 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 15:19:50,572 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 15:19:50,572 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 15:19:50,572 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 15:19:50,573 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 15:19:50,573 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 15:19:50,573 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 15:19:50,573 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 15:19:50,573 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 15:19:50,574 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 15:19:50,574 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 15:19:50,574 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 15:19:50,574 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 15:19:50,574 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 15:19:50,574 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 15:19:50,575 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 15:19:50,575 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 15:19:50,575 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 15:19:50,575 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 15:19:50,575 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 15:19:50,575 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 15:19:50,575 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 15:19:50,575 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 15:19:50,576 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 15:19:50,576 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 15:19:50,576 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 15:19:50,576 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 15:19:50,576 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 15:19:50,576 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 15:19:50,576 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 15:19:50,576 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 15:19:50,577 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 15:19:50,577 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 15:19:50,577 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 15:19:50,577 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 15:19:50,577 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 15:19:50,577 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 15:19:50,577 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 15:19:50,577 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 15:19:50,738 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 15:19:50,752 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 15:19:50,754 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 15:19:50,755 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 15:19:50,755 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 15:19:50,756 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-lopstr16/flag_loopdep_simple.i [2023-04-02 15:19:51,788 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 15:19:51,963 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 15:19:51,963 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-lopstr16/flag_loopdep_simple.i [2023-04-02 15:19:51,967 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/642960862/9d13a931b11044d4812945d5fd528455/FLAGfed3d0d6e [2023-04-02 15:19:51,979 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/642960862/9d13a931b11044d4812945d5fd528455 [2023-04-02 15:19:51,981 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 15:19:51,982 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 15:19:51,983 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 15:19:51,983 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 15:19:51,985 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 15:19:51,985 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 03:19:51" (1/1) ... [2023-04-02 15:19:51,986 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@61d0c6f3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:19:51, skipping insertion in model container [2023-04-02 15:19:51,986 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 03:19:51" (1/1) ... [2023-04-02 15:19:51,991 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 15:19:51,999 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 15:19:52,084 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-lopstr16/flag_loopdep_simple.i[812,825] [2023-04-02 15:19:52,095 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 15:19:52,101 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 15:19:52,109 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-lopstr16/flag_loopdep_simple.i[812,825] [2023-04-02 15:19:52,113 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 15:19:52,122 INFO L208 MainTranslator]: Completed translation [2023-04-02 15:19:52,122 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:19:52 WrapperNode [2023-04-02 15:19:52,122 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 15:19:52,123 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 15:19:52,123 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 15:19:52,123 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 15:19:52,130 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:19:52" (1/1) ... [2023-04-02 15:19:52,131 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:19:52" (1/1) ... [2023-04-02 15:19:52,135 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:19:52" (1/1) ... [2023-04-02 15:19:52,135 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:19:52" (1/1) ... [2023-04-02 15:19:52,139 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:19:52" (1/1) ... [2023-04-02 15:19:52,141 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:19:52" (1/1) ... [2023-04-02 15:19:52,142 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:19:52" (1/1) ... [2023-04-02 15:19:52,142 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:19:52" (1/1) ... [2023-04-02 15:19:52,143 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 15:19:52,144 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 15:19:52,144 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 15:19:52,144 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 15:19:52,145 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:19:52" (1/1) ... [2023-04-02 15:19:52,149 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 15:19:52,155 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:19:52,165 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-02 15:19:52,171 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-02 15:19:52,191 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 15:19:52,192 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 15:19:52,192 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 15:19:52,192 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 15:19:52,192 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2023-04-02 15:19:52,194 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 15:19:52,194 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 15:19:52,194 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 15:19:52,194 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-02 15:19:52,194 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-02 15:19:52,195 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 15:19:52,195 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 15:19:52,195 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 15:19:52,195 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 15:19:52,195 INFO L130 BoogieDeclarations]: Found specification of procedure init [2023-04-02 15:19:52,195 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 15:19:52,195 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 15:19:52,195 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-02 15:19:52,195 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 15:19:52,195 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 15:19:52,195 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 15:19:52,195 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 15:19:52,195 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 15:19:52,243 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 15:19:52,245 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 15:19:52,344 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 15:19:52,401 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 15:19:52,402 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-04-02 15:19:52,403 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 03:19:52 BoogieIcfgContainer [2023-04-02 15:19:52,404 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 15:19:52,405 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 15:19:52,405 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 15:19:52,407 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 15:19:52,407 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 03:19:51" (1/3) ... [2023-04-02 15:19:52,408 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@10aca7ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 03:19:52, skipping insertion in model container [2023-04-02 15:19:52,408 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:19:52" (2/3) ... [2023-04-02 15:19:52,408 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@10aca7ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 03:19:52, skipping insertion in model container [2023-04-02 15:19:52,408 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 03:19:52" (3/3) ... [2023-04-02 15:19:52,409 INFO L112 eAbstractionObserver]: Analyzing ICFG flag_loopdep_simple.i [2023-04-02 15:19:52,421 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 15:19:52,421 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 15:19:52,480 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 15:19:52,486 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;@7fd7cb63, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 15:19:52,486 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 15:19:52,490 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 15 states have (on average 1.4) internal successors, (21), 16 states have internal predecessors, (21), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 15:19:52,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-04-02 15:19:52,495 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:19:52,495 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:19:52,496 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:19:52,502 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:19:52,502 INFO L85 PathProgramCache]: Analyzing trace with hash -1473372044, now seen corresponding path program 1 times [2023-04-02 15:19:52,509 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:19:52,510 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [230828228] [2023-04-02 15:19:52,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:19:52,511 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:19:52,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:19:52,751 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:19:52,751 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:19:52,751 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [230828228] [2023-04-02 15:19:52,752 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [230828228] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 15:19:52,752 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 15:19:52,752 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-02 15:19:52,753 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990472399] [2023-04-02 15:19:52,754 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 15:19:52,756 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 15:19:52,756 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:19:52,774 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 15:19:52,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 15:19:52,776 INFO L87 Difference]: Start difference. First operand has 25 states, 15 states have (on average 1.4) internal successors, (21), 16 states have internal predecessors, (21), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:19:52,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:19:52,810 INFO L93 Difference]: Finished difference Result 45 states and 57 transitions. [2023-04-02 15:19:52,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 15:19:52,814 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2023-04-02 15:19:52,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:19:52,819 INFO L225 Difference]: With dead ends: 45 [2023-04-02 15:19:52,819 INFO L226 Difference]: Without dead ends: 28 [2023-04-02 15:19:52,821 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 15:19:52,823 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 4 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 15:19:52,824 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 36 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 15:19:52,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-04-02 15:19:52,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 23. [2023-04-02 15:19:52,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 15:19:52,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2023-04-02 15:19:52,847 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 17 [2023-04-02 15:19:52,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:19:52,847 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2023-04-02 15:19:52,847 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:19:52,848 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2023-04-02 15:19:52,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-02 15:19:52,848 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:19:52,848 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:19:52,848 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 15:19:52,848 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:19:52,849 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:19:52,849 INFO L85 PathProgramCache]: Analyzing trace with hash 2054628661, now seen corresponding path program 1 times [2023-04-02 15:19:52,849 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:19:52,849 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1783747888] [2023-04-02 15:19:52,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:19:52,850 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:19:52,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:19:52,906 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 15:19:52,907 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:19:52,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1783747888] [2023-04-02 15:19:52,907 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1783747888] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:19:52,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [719763570] [2023-04-02 15:19:52,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:19:52,908 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:19:52,908 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:19:52,910 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:19:52,915 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-02 15:19:52,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:19:52,969 INFO L262 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-02 15:19:52,973 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:19:53,015 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 15:19:53,015 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 15:19:53,015 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [719763570] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 15:19:53,015 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-02 15:19:53,016 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2023-04-02 15:19:53,016 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822315540] [2023-04-02 15:19:53,016 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 15:19:53,017 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-02 15:19:53,017 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:19:53,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-02 15:19:53,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-04-02 15:19:53,019 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 4 states, 3 states have (on average 4.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:19:53,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:19:53,044 INFO L93 Difference]: Finished difference Result 39 states and 45 transitions. [2023-04-02 15:19:53,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-02 15:19:53,045 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2023-04-02 15:19:53,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:19:53,045 INFO L225 Difference]: With dead ends: 39 [2023-04-02 15:19:53,045 INFO L226 Difference]: Without dead ends: 24 [2023-04-02 15:19:53,046 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2023-04-02 15:19:53,047 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 1 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 15:19:53,047 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 56 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 15:19:53,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-04-02 15:19:53,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-04-02 15:19:53,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.25) internal successors, (20), 16 states have internal predecessors, (20), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 15:19:53,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2023-04-02 15:19:53,051 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 18 [2023-04-02 15:19:53,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:19:53,051 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2023-04-02 15:19:53,051 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:19:53,052 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2023-04-02 15:19:53,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-04-02 15:19:53,052 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:19:53,052 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:19:53,057 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-02 15:19:53,256 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:19:53,257 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:19:53,258 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:19:53,258 INFO L85 PathProgramCache]: Analyzing trace with hash -118040639, now seen corresponding path program 1 times [2023-04-02 15:19:53,258 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:19:53,258 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1139406459] [2023-04-02 15:19:53,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:19:53,258 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:19:53,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:19:53,340 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 15:19:53,341 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:19:53,341 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1139406459] [2023-04-02 15:19:53,342 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1139406459] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:19:53,344 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1629072025] [2023-04-02 15:19:53,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:19:53,344 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:19:53,344 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:19:53,346 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:19:53,349 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-02 15:19:53,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:19:53,391 INFO L262 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 5 conjunts are in the unsatisfiable core [2023-04-02 15:19:53,392 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:19:53,420 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 15:19:53,421 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:19:53,503 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 15:19:53,503 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1629072025] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:19:53,504 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [150593969] [2023-04-02 15:19:53,520 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 15:19:53,520 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:19:53,522 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:19:53,525 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:19:53,526 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:19:53,601 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:19:53,800 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2023-04-02 15:19:53,819 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:19:53,824 INFO L197 IcfgInterpreter]: Interpreting procedure init with input of size 35 for LOIs [2023-04-02 15:19:53,896 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:19:54,426 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '402#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_main_~#a~0.base_BEFORE_CALL_3| Int)) (and (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_3|) (<= 2 |v_main_~#a~0.base_BEFORE_CALL_3|) (not (= (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_3|) 0) 0)) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_3|)))) (= |#NULL.base| 0))' at error location [2023-04-02 15:19:54,426 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:19:54,426 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:19:54,427 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5, 5] total 10 [2023-04-02 15:19:54,427 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892245443] [2023-04-02 15:19:54,427 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:19:54,427 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-04-02 15:19:54,427 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:19:54,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-04-02 15:19:54,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=516, Unknown=0, NotChecked=0, Total=600 [2023-04-02 15:19:54,429 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 10 states, 8 states have (on average 2.75) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-04-02 15:19:54,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:19:54,516 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2023-04-02 15:19:54,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-02 15:19:54,516 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.75) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 19 [2023-04-02 15:19:54,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:19:54,517 INFO L225 Difference]: With dead ends: 54 [2023-04-02 15:19:54,517 INFO L226 Difference]: Without dead ends: 38 [2023-04-02 15:19:54,518 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=91, Invalid=559, Unknown=0, NotChecked=0, Total=650 [2023-04-02 15:19:54,518 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 9 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:19:54,519 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 106 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:19:54,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-04-02 15:19:54,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 28. [2023-04-02 15:19:54,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.2) internal successors, (24), 20 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 15:19:54,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2023-04-02 15:19:54,524 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 19 [2023-04-02 15:19:54,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:19:54,524 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2023-04-02 15:19:54,526 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.75) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-04-02 15:19:54,526 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2023-04-02 15:19:54,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-04-02 15:19:54,526 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:19:54,527 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:19:54,533 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-04-02 15:19:54,731 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-04-02 15:19:54,734 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:19:54,734 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:19:54,734 INFO L85 PathProgramCache]: Analyzing trace with hash -377956972, now seen corresponding path program 2 times [2023-04-02 15:19:54,734 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:19:54,736 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1661230509] [2023-04-02 15:19:54,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:19:54,737 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:19:54,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:19:54,829 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 15:19:54,829 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:19:54,829 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1661230509] [2023-04-02 15:19:54,829 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1661230509] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:19:54,829 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [736006011] [2023-04-02 15:19:54,829 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:19:54,830 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:19:54,830 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:19:54,831 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:19:54,855 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-02 15:19:54,888 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-02 15:19:54,889 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:19:54,889 INFO L262 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-02 15:19:54,891 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:19:54,900 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 15:19:54,900 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:19:54,920 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 15:19:54,920 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [736006011] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:19:54,920 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1584437531] [2023-04-02 15:19:54,922 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 15:19:54,922 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:19:54,922 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:19:54,922 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:19:54,922 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:19:54,944 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:19:55,039 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2023-04-02 15:19:55,049 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:19:55,054 INFO L197 IcfgInterpreter]: Interpreting procedure init with input of size 35 for LOIs [2023-04-02 15:19:55,095 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:19:55,481 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '688#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_main_~#a~0.base_BEFORE_CALL_7| Int)) (and (not (= (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_7|) 0) 0)) (<= 2 |v_main_~#a~0.base_BEFORE_CALL_7|) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_7|) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_7|)))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:19:55,481 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:19:55,481 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:19:55,481 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2023-04-02 15:19:55,481 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [648928205] [2023-04-02 15:19:55,481 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:19:55,482 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-02 15:19:55,482 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:19:55,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-02 15:19:55,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=451, Unknown=0, NotChecked=0, Total=552 [2023-04-02 15:19:55,483 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:19:55,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:19:55,553 INFO L93 Difference]: Finished difference Result 69 states and 87 transitions. [2023-04-02 15:19:55,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-02 15:19:55,553 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 23 [2023-04-02 15:19:55,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:19:55,555 INFO L225 Difference]: With dead ends: 69 [2023-04-02 15:19:55,556 INFO L226 Difference]: Without dead ends: 58 [2023-04-02 15:19:55,556 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=101, Invalid=451, Unknown=0, NotChecked=0, Total=552 [2023-04-02 15:19:55,558 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 38 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:19:55,559 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 56 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:19:55,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-04-02 15:19:55,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 32. [2023-04-02 15:19:55,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 24 states have internal predecessors, (28), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 15:19:55,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2023-04-02 15:19:55,570 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 23 [2023-04-02 15:19:55,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:19:55,570 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2023-04-02 15:19:55,570 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:19:55,570 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2023-04-02 15:19:55,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-04-02 15:19:55,570 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:19:55,570 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:19:55,577 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 15:19:55,771 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:19:55,771 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:19:55,772 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:19:55,772 INFO L85 PathProgramCache]: Analyzing trace with hash -111874604, now seen corresponding path program 3 times [2023-04-02 15:19:55,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:19:55,772 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063721119] [2023-04-02 15:19:55,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:19:55,772 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:19:55,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:19:55,884 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 15:19:55,884 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:19:55,884 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063721119] [2023-04-02 15:19:55,884 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1063721119] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:19:55,885 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1414463778] [2023-04-02 15:19:55,885 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:19:55,885 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:19:55,885 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:19:55,886 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:19:55,888 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-02 15:19:55,931 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:19:55,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:19:55,932 INFO L262 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-02 15:19:55,933 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:19:55,992 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-02 15:19:55,992 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:19:56,107 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-02 15:19:56,107 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1414463778] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:19:56,107 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1248588329] [2023-04-02 15:19:56,109 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 15:19:56,109 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:19:56,109 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:19:56,109 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:19:56,109 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:19:56,120 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:19:56,176 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2023-04-02 15:19:56,184 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:19:56,186 INFO L197 IcfgInterpreter]: Interpreting procedure init with input of size 35 for LOIs [2023-04-02 15:19:56,214 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:19:56,703 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1040#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_main_~#a~0.base_BEFORE_CALL_11| Int)) (and (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_11|) (<= 3 (+ |v_main_~#a~0.base_BEFORE_CALL_11| |#StackHeapBarrier|)) (<= 2 |v_main_~#a~0.base_BEFORE_CALL_11|) (not (= (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_11|) 0) 0)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:19:56,703 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:19:56,703 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:19:56,703 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 21 [2023-04-02 15:19:56,703 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072000761] [2023-04-02 15:19:56,703 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:19:56,704 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-04-02 15:19:56,704 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:19:56,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-04-02 15:19:56,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=1079, Unknown=0, NotChecked=0, Total=1260 [2023-04-02 15:19:56,705 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand has 21 states, 19 states have (on average 1.736842105263158) internal successors, (33), 21 states have internal predecessors, (33), 2 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-04-02 15:19:56,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:19:56,812 INFO L93 Difference]: Finished difference Result 95 states and 121 transitions. [2023-04-02 15:19:56,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-04-02 15:19:56,813 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 1.736842105263158) internal successors, (33), 21 states have internal predecessors, (33), 2 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 27 [2023-04-02 15:19:56,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:19:56,815 INFO L225 Difference]: With dead ends: 95 [2023-04-02 15:19:56,815 INFO L226 Difference]: Without dead ends: 74 [2023-04-02 15:19:56,816 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 429 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=191, Invalid=1141, Unknown=0, NotChecked=0, Total=1332 [2023-04-02 15:19:56,817 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 40 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:19:56,817 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 128 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:19:56,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2023-04-02 15:19:56,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 39. [2023-04-02 15:19:56,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 31 states have (on average 1.1290322580645162) internal successors, (35), 31 states have internal predecessors, (35), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 15:19:56,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2023-04-02 15:19:56,830 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 27 [2023-04-02 15:19:56,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:19:56,830 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2023-04-02 15:19:56,830 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 1.736842105263158) internal successors, (33), 21 states have internal predecessors, (33), 2 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-04-02 15:19:56,830 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2023-04-02 15:19:56,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-04-02 15:19:56,831 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:19:56,831 INFO L195 NwaCegarLoop]: trace histogram [10, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:19:56,836 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-02 15:19:57,032 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:19:57,032 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:19:57,032 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:19:57,032 INFO L85 PathProgramCache]: Analyzing trace with hash 987379797, now seen corresponding path program 4 times [2023-04-02 15:19:57,032 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:19:57,033 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1820860205] [2023-04-02 15:19:57,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:19:57,033 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:19:57,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:19:57,137 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-04-02 15:19:57,138 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:19:57,138 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1820860205] [2023-04-02 15:19:57,138 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1820860205] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:19:57,138 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [735906059] [2023-04-02 15:19:57,138 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:19:57,139 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:19:57,139 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:19:57,144 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:19:57,173 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-02 15:19:57,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:19:57,207 INFO L262 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 14 conjunts are in the unsatisfiable core [2023-04-02 15:19:57,209 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:19:57,359 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-04-02 15:19:57,359 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:19:57,660 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-04-02 15:19:57,661 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [735906059] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:19:57,661 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [245768504] [2023-04-02 15:19:57,662 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 15:19:57,662 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:19:57,662 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:19:57,663 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:19:57,663 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:19:57,684 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:19:57,754 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2023-04-02 15:19:57,765 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:19:57,767 INFO L197 IcfgInterpreter]: Interpreting procedure init with input of size 35 for LOIs [2023-04-02 15:19:57,800 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:19:58,314 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1506#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_main_~#a~0.base_BEFORE_CALL_15| Int)) (and (not (= (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_15|) 0) 0)) (<= 3 (+ |v_main_~#a~0.base_BEFORE_CALL_15| |#StackHeapBarrier|)) (<= 2 |v_main_~#a~0.base_BEFORE_CALL_15|) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_15|))) (= |#NULL.base| 0))' at error location [2023-04-02 15:19:58,314 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:19:58,314 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:19:58,314 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14, 14] total 34 [2023-04-02 15:19:58,314 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381402922] [2023-04-02 15:19:58,314 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:19:58,315 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2023-04-02 15:19:58,315 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:19:58,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2023-04-02 15:19:58,316 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=414, Invalid=1938, Unknown=0, NotChecked=0, Total=2352 [2023-04-02 15:19:58,316 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand has 34 states, 32 states have (on average 1.4375) internal successors, (46), 34 states have internal predecessors, (46), 2 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-04-02 15:19:58,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:19:58,435 INFO L93 Difference]: Finished difference Result 114 states and 148 transitions. [2023-04-02 15:19:58,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2023-04-02 15:19:58,436 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 32 states have (on average 1.4375) internal successors, (46), 34 states have internal predecessors, (46), 2 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 34 [2023-04-02 15:19:58,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:19:58,437 INFO L225 Difference]: With dead ends: 114 [2023-04-02 15:19:58,437 INFO L226 Difference]: Without dead ends: 92 [2023-04-02 15:19:58,437 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 824 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=430, Invalid=2020, Unknown=0, NotChecked=0, Total=2450 [2023-04-02 15:19:58,438 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 69 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:19:58,438 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [77 Valid, 107 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:19:58,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2023-04-02 15:19:58,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 52. [2023-04-02 15:19:58,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 44 states have (on average 1.0909090909090908) internal successors, (48), 44 states have internal predecessors, (48), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 15:19:58,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2023-04-02 15:19:58,443 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 34 [2023-04-02 15:19:58,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:19:58,443 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2023-04-02 15:19:58,443 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 32 states have (on average 1.4375) internal successors, (46), 34 states have internal predecessors, (46), 2 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-04-02 15:19:58,443 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2023-04-02 15:19:58,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-04-02 15:19:58,444 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:19:58,444 INFO L195 NwaCegarLoop]: trace histogram [22, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:19:58,449 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-02 15:19:58,649 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:19:58,651 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:19:58,651 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:19:58,651 INFO L85 PathProgramCache]: Analyzing trace with hash -2055544716, now seen corresponding path program 5 times [2023-04-02 15:19:58,652 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:19:58,652 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [403500418] [2023-04-02 15:19:58,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:19:58,652 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:19:58,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:19:58,783 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2023-04-02 15:19:58,784 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:19:58,784 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [403500418] [2023-04-02 15:19:58,784 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [403500418] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:19:58,784 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [177583226] [2023-04-02 15:19:58,784 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:19:58,784 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:19:58,784 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:19:58,785 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:19:58,799 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-02 15:19:58,874 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-04-02 15:19:58,875 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:19:58,876 INFO L262 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-02 15:19:58,879 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:19:58,897 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2023-04-02 15:19:58,897 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:19:58,991 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2023-04-02 15:19:58,991 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [177583226] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:19:58,991 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2096413342] [2023-04-02 15:19:58,992 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 15:19:58,992 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:19:58,993 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:19:58,993 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:19:58,993 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:19:59,003 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:19:59,075 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2023-04-02 15:19:59,083 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:19:59,085 INFO L197 IcfgInterpreter]: Interpreting procedure init with input of size 35 for LOIs [2023-04-02 15:19:59,131 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:19:59,564 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2098#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_main_~#a~0.base_BEFORE_CALL_19| Int)) (and (<= 3 (+ |v_main_~#a~0.base_BEFORE_CALL_19| |#StackHeapBarrier|)) (<= 2 |v_main_~#a~0.base_BEFORE_CALL_19|) (not (= (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_19|) 0) 0)) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_19|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:19:59,564 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:19:59,564 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:19:59,564 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2023-04-02 15:19:59,564 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077390748] [2023-04-02 15:19:59,564 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:19:59,565 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-04-02 15:19:59,565 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:19:59,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-04-02 15:19:59,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=299, Invalid=961, Unknown=0, NotChecked=0, Total=1260 [2023-04-02 15:19:59,566 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand has 21 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:19:59,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:19:59,685 INFO L93 Difference]: Finished difference Result 159 states and 207 transitions. [2023-04-02 15:19:59,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-04-02 15:19:59,685 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 47 [2023-04-02 15:19:59,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:19:59,686 INFO L225 Difference]: With dead ends: 159 [2023-04-02 15:19:59,687 INFO L226 Difference]: Without dead ends: 148 [2023-04-02 15:19:59,687 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 481 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=299, Invalid=961, Unknown=0, NotChecked=0, Total=1260 [2023-04-02 15:19:59,687 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 200 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:19:59,688 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [218 Valid, 95 Invalid, 192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:19:59,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2023-04-02 15:19:59,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 62. [2023-04-02 15:19:59,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 54 states have (on average 1.0740740740740742) internal successors, (58), 54 states have internal predecessors, (58), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 15:19:59,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 65 transitions. [2023-04-02 15:19:59,694 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 65 transitions. Word has length 47 [2023-04-02 15:19:59,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:19:59,695 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 65 transitions. [2023-04-02 15:19:59,695 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:19:59,695 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 65 transitions. [2023-04-02 15:19:59,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-04-02 15:19:59,696 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:19:59,696 INFO L195 NwaCegarLoop]: trace histogram [22, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:19:59,701 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-04-02 15:19:59,901 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:19:59,901 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:19:59,901 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:19:59,902 INFO L85 PathProgramCache]: Analyzing trace with hash 1451919636, now seen corresponding path program 6 times [2023-04-02 15:19:59,902 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:19:59,902 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1737037379] [2023-04-02 15:19:59,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:19:59,902 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:19:59,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:20:00,267 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2023-04-02 15:20:00,267 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:20:00,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1737037379] [2023-04-02 15:20:00,267 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1737037379] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:20:00,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1966045541] [2023-04-02 15:20:00,267 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:20:00,268 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:20:00,268 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:20:00,269 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:20:00,296 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-02 15:20:00,358 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:20:00,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:20:00,360 INFO L262 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 26 conjunts are in the unsatisfiable core [2023-04-02 15:20:00,362 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:20:00,822 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2023-04-02 15:20:00,822 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:20:01,781 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2023-04-02 15:20:01,781 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1966045541] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:20:01,781 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2084431332] [2023-04-02 15:20:01,782 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 15:20:01,783 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:20:01,783 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:20:01,783 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:20:01,783 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:20:01,806 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:20:01,880 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2023-04-02 15:20:01,887 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:20:01,888 INFO L197 IcfgInterpreter]: Interpreting procedure init with input of size 35 for LOIs [2023-04-02 15:20:01,921 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:20:02,540 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2882#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_main_~#a~0.base_BEFORE_CALL_23| Int)) (and (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_23|) (<= 2 |v_main_~#a~0.base_BEFORE_CALL_23|) (<= 3 (+ |v_main_~#a~0.base_BEFORE_CALL_23| |#StackHeapBarrier|)) (not (= (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_23|) 0) 0)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:20:02,540 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:20:02,540 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:20:02,540 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 26, 26] total 69 [2023-04-02 15:20:02,540 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188476730] [2023-04-02 15:20:02,541 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:20:02,541 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2023-04-02 15:20:02,541 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:20:02,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2023-04-02 15:20:02,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1477, Invalid=5495, Unknown=0, NotChecked=0, Total=6972 [2023-04-02 15:20:02,543 INFO L87 Difference]: Start difference. First operand 62 states and 65 transitions. Second operand has 69 states, 67 states have (on average 1.208955223880597) internal successors, (81), 69 states have internal predecessors, (81), 2 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-04-02 15:20:02,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:20:02,744 INFO L93 Difference]: Finished difference Result 215 states and 283 transitions. [2023-04-02 15:20:02,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2023-04-02 15:20:02,745 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 67 states have (on average 1.208955223880597) internal successors, (81), 69 states have internal predecessors, (81), 2 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 57 [2023-04-02 15:20:02,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:20:02,746 INFO L225 Difference]: With dead ends: 215 [2023-04-02 15:20:02,746 INFO L226 Difference]: Without dead ends: 182 [2023-04-02 15:20:02,747 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2271 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1505, Invalid=5635, Unknown=0, NotChecked=0, Total=7140 [2023-04-02 15:20:02,747 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 170 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 189 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:20:02,748 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [189 Valid, 156 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 209 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:20:02,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2023-04-02 15:20:02,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 87. [2023-04-02 15:20:02,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 79 states have (on average 1.0506329113924051) internal successors, (83), 79 states have internal predecessors, (83), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 15:20:02,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2023-04-02 15:20:02,756 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 57 [2023-04-02 15:20:02,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:20:02,756 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2023-04-02 15:20:02,756 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 67 states have (on average 1.208955223880597) internal successors, (81), 69 states have internal predecessors, (81), 2 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-04-02 15:20:02,756 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2023-04-02 15:20:02,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2023-04-02 15:20:02,757 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:20:02,757 INFO L195 NwaCegarLoop]: trace histogram [46, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:20:02,762 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-04-02 15:20:02,962 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:20:02,962 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:20:02,963 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:20:02,963 INFO L85 PathProgramCache]: Analyzing trace with hash -1381703019, now seen corresponding path program 7 times [2023-04-02 15:20:02,963 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:20:02,963 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1703285377] [2023-04-02 15:20:02,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:20:02,963 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:20:02,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:20:03,408 INFO L134 CoverageAnalysis]: Checked inductivity of 1271 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2023-04-02 15:20:03,408 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:20:03,408 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1703285377] [2023-04-02 15:20:03,408 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1703285377] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:20:03,408 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [334768437] [2023-04-02 15:20:03,409 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:20:03,409 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:20:03,409 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:20:03,410 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:20:03,412 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-02 15:20:03,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:20:03,557 INFO L262 TraceCheckSpWp]: Trace formula consists of 579 conjuncts, 50 conjunts are in the unsatisfiable core [2023-04-02 15:20:03,562 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:20:04,887 INFO L134 CoverageAnalysis]: Checked inductivity of 1271 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2023-04-02 15:20:04,887 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:20:07,899 INFO L134 CoverageAnalysis]: Checked inductivity of 1271 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2023-04-02 15:20:07,899 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [334768437] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:20:07,899 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1700832010] [2023-04-02 15:20:07,909 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 15:20:07,910 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:20:07,910 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:20:07,910 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:20:07,910 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:20:07,921 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:20:07,980 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2023-04-02 15:20:07,989 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:20:07,991 INFO L197 IcfgInterpreter]: Interpreting procedure init with input of size 35 for LOIs [2023-04-02 15:20:08,036 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:20:08,838 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4020#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_main_~#a~0.base_BEFORE_CALL_27| Int)) (and (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_27|) (not (= (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_27|) 0) 0)) (<= 2 |v_main_~#a~0.base_BEFORE_CALL_27|) (<= 3 (+ |v_main_~#a~0.base_BEFORE_CALL_27| |#StackHeapBarrier|)))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:20:08,839 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:20:08,839 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:20:08,839 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 50, 50] total 118 [2023-04-02 15:20:08,839 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791177541] [2023-04-02 15:20:08,839 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:20:08,839 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 118 states [2023-04-02 15:20:08,840 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:20:08,841 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2023-04-02 15:20:08,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4980, Invalid=12576, Unknown=0, NotChecked=0, Total=17556 [2023-04-02 15:20:08,844 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand has 118 states, 116 states have (on average 1.1206896551724137) internal successors, (130), 118 states have internal predecessors, (130), 2 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-04-02 15:20:09,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:20:09,227 INFO L93 Difference]: Finished difference Result 270 states and 364 transitions. [2023-04-02 15:20:09,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2023-04-02 15:20:09,228 INFO L78 Accepts]: Start accepts. Automaton has has 118 states, 116 states have (on average 1.1206896551724137) internal successors, (130), 118 states have internal predecessors, (130), 2 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 82 [2023-04-02 15:20:09,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:20:09,229 INFO L225 Difference]: With dead ends: 270 [2023-04-02 15:20:09,229 INFO L226 Difference]: Without dead ends: 236 [2023-04-02 15:20:09,232 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4376 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=5032, Invalid=12790, Unknown=0, NotChecked=0, Total=17822 [2023-04-02 15:20:09,232 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 178 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 299 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 198 SdHoareTripleChecker+Valid, 248 SdHoareTripleChecker+Invalid, 359 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 299 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 15:20:09,232 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [198 Valid, 248 Invalid, 359 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 299 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 15:20:09,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2023-04-02 15:20:09,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 136. [2023-04-02 15:20:09,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 128 states have (on average 1.03125) internal successors, (132), 128 states have internal predecessors, (132), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 15:20:09,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 139 transitions. [2023-04-02 15:20:09,242 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 139 transitions. Word has length 82 [2023-04-02 15:20:09,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:20:09,243 INFO L495 AbstractCegarLoop]: Abstraction has 136 states and 139 transitions. [2023-04-02 15:20:09,243 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 118 states, 116 states have (on average 1.1206896551724137) internal successors, (130), 118 states have internal predecessors, (130), 2 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-04-02 15:20:09,243 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 139 transitions. [2023-04-02 15:20:09,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2023-04-02 15:20:09,244 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:20:09,244 INFO L195 NwaCegarLoop]: trace histogram [94, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:20:09,254 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-04-02 15:20:09,449 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-04-02 15:20:09,452 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:20:09,452 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:20:09,452 INFO L85 PathProgramCache]: Analyzing trace with hash -1046150348, now seen corresponding path program 8 times [2023-04-02 15:20:09,452 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:20:09,452 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1621085248] [2023-04-02 15:20:09,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:20:09,452 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:20:09,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:20:10,158 INFO L134 CoverageAnalysis]: Checked inductivity of 4675 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 4465 trivial. 0 not checked. [2023-04-02 15:20:10,158 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:20:10,158 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1621085248] [2023-04-02 15:20:10,158 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1621085248] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:20:10,158 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1619601568] [2023-04-02 15:20:10,158 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:20:10,159 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:20:10,159 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:20:10,161 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:20:10,182 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-04-02 15:20:10,447 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2023-04-02 15:20:10,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:20:10,450 INFO L262 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 22 conjunts are in the unsatisfiable core [2023-04-02 15:20:10,452 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:20:10,487 INFO L134 CoverageAnalysis]: Checked inductivity of 4675 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 4465 trivial. 0 not checked. [2023-04-02 15:20:10,487 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:20:10,894 INFO L134 CoverageAnalysis]: Checked inductivity of 4675 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 4465 trivial. 0 not checked. [2023-04-02 15:20:10,894 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1619601568] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:20:10,894 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1077583656] [2023-04-02 15:20:10,896 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 15:20:10,896 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:20:10,896 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:20:10,896 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:20:10,896 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:20:10,905 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:20:10,972 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2023-04-02 15:20:10,978 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:20:10,980 INFO L197 IcfgInterpreter]: Interpreting procedure init with input of size 35 for LOIs [2023-04-02 15:20:11,005 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:20:11,456 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5584#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_main_~#a~0.base_BEFORE_CALL_31| Int)) (and (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_31|) (<= 2 |v_main_~#a~0.base_BEFORE_CALL_31|) (<= 3 (+ |v_main_~#a~0.base_BEFORE_CALL_31| |#StackHeapBarrier|)) (not (= (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_31|) 0) 0)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:20:11,457 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:20:11,457 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:20:11,457 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2023-04-02 15:20:11,457 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2030193493] [2023-04-02 15:20:11,457 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:20:11,458 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2023-04-02 15:20:11,458 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:20:11,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2023-04-02 15:20:11,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1127, Invalid=2413, Unknown=0, NotChecked=0, Total=3540 [2023-04-02 15:20:11,459 INFO L87 Difference]: Start difference. First operand 136 states and 139 transitions. Second operand has 45 states, 45 states have (on average 1.2444444444444445) internal successors, (56), 45 states have internal predecessors, (56), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:20:11,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:20:11,784 INFO L93 Difference]: Finished difference Result 375 states and 483 transitions. [2023-04-02 15:20:11,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2023-04-02 15:20:11,784 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.2444444444444445) internal successors, (56), 45 states have internal predecessors, (56), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 131 [2023-04-02 15:20:11,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:20:11,786 INFO L225 Difference]: With dead ends: 375 [2023-04-02 15:20:11,787 INFO L226 Difference]: Without dead ends: 364 [2023-04-02 15:20:11,788 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 415 GetRequests, 357 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1093 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1127, Invalid=2413, Unknown=0, NotChecked=0, Total=3540 [2023-04-02 15:20:11,788 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 434 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 272 mSolverCounterSat, 146 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 476 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 418 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 146 IncrementalHoareTripleChecker+Valid, 272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 15:20:11,789 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [476 Valid, 204 Invalid, 418 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [146 Valid, 272 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 15:20:11,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 364 states. [2023-04-02 15:20:11,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 364 to 158. [2023-04-02 15:20:11,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 150 states have (on average 1.0266666666666666) internal successors, (154), 150 states have internal predecessors, (154), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 15:20:11,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 161 transitions. [2023-04-02 15:20:11,814 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 161 transitions. Word has length 131 [2023-04-02 15:20:11,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:20:11,815 INFO L495 AbstractCegarLoop]: Abstraction has 158 states and 161 transitions. [2023-04-02 15:20:11,815 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.2444444444444445) internal successors, (56), 45 states have internal predecessors, (56), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:20:11,815 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 161 transitions. [2023-04-02 15:20:11,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2023-04-02 15:20:11,817 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:20:11,817 INFO L195 NwaCegarLoop]: trace histogram [94, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:20:11,825 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-04-02 15:20:12,021 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-04-02 15:20:12,021 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:20:12,021 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:20:12,021 INFO L85 PathProgramCache]: Analyzing trace with hash -685587308, now seen corresponding path program 9 times [2023-04-02 15:20:12,021 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:20:12,021 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927160771] [2023-04-02 15:20:12,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:20:12,022 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:20:12,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:20:13,382 INFO L134 CoverageAnalysis]: Checked inductivity of 5368 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 4465 trivial. 0 not checked. [2023-04-02 15:20:13,382 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:20:13,382 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927160771] [2023-04-02 15:20:13,382 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1927160771] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:20:13,383 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [646921969] [2023-04-02 15:20:13,383 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:20:13,383 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:20:13,383 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:20:13,384 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:20:13,408 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-04-02 15:20:13,625 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:20:13,625 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:20:13,630 INFO L262 TraceCheckSpWp]: Trace formula consists of 1103 conjuncts, 98 conjunts are in the unsatisfiable core [2023-04-02 15:20:13,634 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:20:18,061 INFO L134 CoverageAnalysis]: Checked inductivity of 5368 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 903 trivial. 0 not checked. [2023-04-02 15:20:18,062 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:20:29,344 INFO L134 CoverageAnalysis]: Checked inductivity of 5368 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 903 trivial. 0 not checked. [2023-04-02 15:20:29,345 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [646921969] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:20:29,345 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [966943107] [2023-04-02 15:20:29,346 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 15:20:29,346 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:20:29,346 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:20:29,346 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:20:29,346 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:20:29,357 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:20:29,405 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2023-04-02 15:20:29,415 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:20:29,417 INFO L197 IcfgInterpreter]: Interpreting procedure init with input of size 35 for LOIs [2023-04-02 15:20:29,448 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:20:30,713 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7664#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_main_~#a~0.base_BEFORE_CALL_35| Int)) (and (not (= (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_35|) 0) 0)) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_35|) (<= 3 (+ |v_main_~#a~0.base_BEFORE_CALL_35| |#StackHeapBarrier|)) (<= 2 |v_main_~#a~0.base_BEFORE_CALL_35|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:20:30,713 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:20:30,713 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:20:30,713 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 98, 98] total 237 [2023-04-02 15:20:30,713 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311296820] [2023-04-02 15:20:30,713 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:20:30,714 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 237 states [2023-04-02 15:20:30,714 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:20:30,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 237 interpolants. [2023-04-02 15:20:30,722 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19657, Invalid=43595, Unknown=0, NotChecked=0, Total=63252 [2023-04-02 15:20:30,722 INFO L87 Difference]: Start difference. First operand 158 states and 161 transitions. Second operand has 237 states, 235 states have (on average 1.0595744680851065) internal successors, (249), 237 states have internal predecessors, (249), 2 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-04-02 15:20:32,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:20:32,421 INFO L93 Difference]: Finished difference Result 527 states and 715 transitions. [2023-04-02 15:20:32,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 237 states. [2023-04-02 15:20:32,422 INFO L78 Accepts]: Start accepts. Automaton has has 237 states, 235 states have (on average 1.0595744680851065) internal successors, (249), 237 states have internal predecessors, (249), 2 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 153 [2023-04-02 15:20:32,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:20:32,424 INFO L225 Difference]: With dead ends: 527 [2023-04-02 15:20:32,424 INFO L226 Difference]: Without dead ends: 470 [2023-04-02 15:20:32,427 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 253 SyntacticMatches, 0 SemanticMatches, 251 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13263 ImplicationChecksByTransitivity, 16.3s TimeCoverageRelationStatistics Valid=19757, Invalid=43999, Unknown=0, NotChecked=0, Total=63756 [2023-04-02 15:20:32,427 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 488 mSDsluCounter, 236 mSDsCounter, 0 mSdLazyCounter, 503 mSolverCounterSat, 165 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 531 SdHoareTripleChecker+Valid, 253 SdHoareTripleChecker+Invalid, 668 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 165 IncrementalHoareTripleChecker+Valid, 503 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 15:20:32,427 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [531 Valid, 253 Invalid, 668 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [165 Valid, 503 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 15:20:32,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 470 states. [2023-04-02 15:20:32,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 255. [2023-04-02 15:20:32,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255 states, 247 states have (on average 1.0161943319838056) internal successors, (251), 247 states have internal predecessors, (251), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 15:20:32,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 258 transitions. [2023-04-02 15:20:32,442 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 258 transitions. Word has length 153 [2023-04-02 15:20:32,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:20:32,443 INFO L495 AbstractCegarLoop]: Abstraction has 255 states and 258 transitions. [2023-04-02 15:20:32,443 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 237 states, 235 states have (on average 1.0595744680851065) internal successors, (249), 237 states have internal predecessors, (249), 2 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-04-02 15:20:32,443 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 258 transitions. [2023-04-02 15:20:32,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2023-04-02 15:20:32,445 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:20:32,445 INFO L195 NwaCegarLoop]: trace histogram [190, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:20:32,451 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-04-02 15:20:32,652 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-04-02 15:20:32,652 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:20:32,653 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:20:32,653 INFO L85 PathProgramCache]: Analyzing trace with hash 1193757973, now seen corresponding path program 10 times [2023-04-02 15:20:32,653 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:20:32,653 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1748831353] [2023-04-02 15:20:32,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:20:32,653 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:20:32,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:20:34,776 INFO L134 CoverageAnalysis]: Checked inductivity of 19091 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 18145 trivial. 0 not checked. [2023-04-02 15:20:34,776 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:20:34,777 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1748831353] [2023-04-02 15:20:34,777 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1748831353] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:20:34,777 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1047359862] [2023-04-02 15:20:34,777 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:20:34,777 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:20:34,777 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:20:34,778 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:20:34,778 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-04-02 15:20:35,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:20:35,186 INFO L262 TraceCheckSpWp]: Trace formula consists of 1971 conjuncts, 194 conjunts are in the unsatisfiable core [2023-04-02 15:20:35,192 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:20:49,775 INFO L134 CoverageAnalysis]: Checked inductivity of 19091 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2023-04-02 15:20:49,775 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:21:31,904 INFO L134 CoverageAnalysis]: Checked inductivity of 19091 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2023-04-02 15:21:31,905 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1047359862] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:21:31,905 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [368372890] [2023-04-02 15:21:31,906 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 15:21:31,906 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:21:31,906 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:21:31,906 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:21:31,906 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:21:31,916 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:21:31,961 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2023-04-02 15:21:31,967 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:21:31,969 INFO L197 IcfgInterpreter]: Interpreting procedure init with input of size 35 for LOIs [2023-04-02 15:21:31,995 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:21:33,951 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11010#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_main_~#a~0.base_BEFORE_CALL_39| Int)) (and (<= 2 |v_main_~#a~0.base_BEFORE_CALL_39|) (<= 3 (+ |v_main_~#a~0.base_BEFORE_CALL_39| |#StackHeapBarrier|)) (not (= (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_39|) 0) 0)) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_39|))) (= |#NULL.base| 0))' at error location [2023-04-02 15:21:33,952 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:21:33,952 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:21:33,952 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 194, 194] total 430 [2023-04-02 15:21:33,952 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2030166863] [2023-04-02 15:21:33,952 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:21:33,953 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 430 states [2023-04-02 15:21:33,953 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:21:33,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 430 interpolants. [2023-04-02 15:21:33,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75096, Invalid=122484, Unknown=0, NotChecked=0, Total=197580 [2023-04-02 15:21:33,970 INFO L87 Difference]: Start difference. First operand 255 states and 258 transitions. Second operand has 430 states, 428 states have (on average 1.0327102803738317) internal successors, (442), 430 states have internal predecessors, (442), 2 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-04-02 15:21:50,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:21:50,823 INFO L93 Difference]: Finished difference Result 726 states and 1012 transitions. [2023-04-02 15:21:50,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 430 states. [2023-04-02 15:21:50,824 INFO L78 Accepts]: Start accepts. Automaton has has 430 states, 428 states have (on average 1.0327102803738317) internal successors, (442), 430 states have internal predecessors, (442), 2 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 250 [2023-04-02 15:21:50,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:21:50,826 INFO L225 Difference]: With dead ends: 726 [2023-04-02 15:21:50,826 INFO L226 Difference]: Without dead ends: 668 [2023-04-02 15:21:50,835 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 796 GetRequests, 352 SyntacticMatches, 0 SemanticMatches, 444 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26240 ImplicationChecksByTransitivity, 55.5s TimeCoverageRelationStatistics Valid=75292, Invalid=123178, Unknown=0, NotChecked=0, Total=198470 [2023-04-02 15:21:50,835 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 600 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 714 mSolverCounterSat, 202 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 644 SdHoareTripleChecker+Valid, 285 SdHoareTripleChecker+Invalid, 916 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 202 IncrementalHoareTripleChecker+Valid, 714 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-02 15:21:50,836 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [644 Valid, 285 Invalid, 916 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [202 Valid, 714 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-04-02 15:21:50,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 668 states. [2023-04-02 15:21:50,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 668 to 448. [2023-04-02 15:21:50,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 448 states, 440 states have (on average 1.009090909090909) internal successors, (444), 440 states have internal predecessors, (444), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 15:21:50,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 448 states to 448 states and 451 transitions. [2023-04-02 15:21:50,859 INFO L78 Accepts]: Start accepts. Automaton has 448 states and 451 transitions. Word has length 250 [2023-04-02 15:21:50,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:21:50,860 INFO L495 AbstractCegarLoop]: Abstraction has 448 states and 451 transitions. [2023-04-02 15:21:50,860 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 430 states, 428 states have (on average 1.0327102803738317) internal successors, (442), 430 states have internal predecessors, (442), 2 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-04-02 15:21:50,860 INFO L276 IsEmpty]: Start isEmpty. Operand 448 states and 451 transitions. [2023-04-02 15:21:50,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 444 [2023-04-02 15:21:50,864 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:21:50,864 INFO L195 NwaCegarLoop]: trace histogram [382, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:21:50,872 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 15:21:51,072 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-04-02 15:21:51,072 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:21:51,073 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:21:51,073 INFO L85 PathProgramCache]: Analyzing trace with hash 1823800500, now seen corresponding path program 11 times [2023-04-02 15:21:51,073 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:21:51,073 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2064563567] [2023-04-02 15:21:51,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:21:51,073 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:21:51,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:21:54,119 INFO L134 CoverageAnalysis]: Checked inductivity of 74143 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 73153 trivial. 0 not checked. [2023-04-02 15:21:54,119 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:21:54,119 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2064563567] [2023-04-02 15:21:54,119 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2064563567] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:21:54,119 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [459385635] [2023-04-02 15:21:54,119 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:21:54,120 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:21:54,120 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:21:54,121 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:21:54,122 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-04-02 15:22:09,616 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2023-04-02 15:22:09,616 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:22:09,629 INFO L262 TraceCheckSpWp]: Trace formula consists of 661 conjuncts, 46 conjunts are in the unsatisfiable core [2023-04-02 15:22:09,635 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:22:09,695 INFO L134 CoverageAnalysis]: Checked inductivity of 74143 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 73153 trivial. 0 not checked. [2023-04-02 15:22:09,696 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:22:11,488 INFO L134 CoverageAnalysis]: Checked inductivity of 74143 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 73153 trivial. 0 not checked. [2023-04-02 15:22:11,488 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [459385635] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:22:11,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [977675245] [2023-04-02 15:22:11,491 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 15:22:11,492 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:22:11,492 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:22:11,492 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:22:11,492 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:22:11,501 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:22:11,551 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2023-04-02 15:22:11,557 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:22:11,558 INFO L197 IcfgInterpreter]: Interpreting procedure init with input of size 35 for LOIs [2023-04-02 15:22:11,584 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:22:12,205 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15958#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_main_~#a~0.base_BEFORE_CALL_43| Int)) (and (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_43|) (<= 3 (+ |v_main_~#a~0.base_BEFORE_CALL_43| |#StackHeapBarrier|)) (<= 2 |v_main_~#a~0.base_BEFORE_CALL_43|) (not (= (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_43|) 0) 0)))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:22:12,205 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:22:12,205 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:22:12,206 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2023-04-02 15:22:12,206 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [68956412] [2023-04-02 15:22:12,206 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:22:12,206 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2023-04-02 15:22:12,206 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:22:12,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2023-04-02 15:22:12,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4511, Invalid=7045, Unknown=0, NotChecked=0, Total=11556 [2023-04-02 15:22:12,209 INFO L87 Difference]: Start difference. First operand 448 states and 451 transitions. Second operand has 93 states, 93 states have (on average 1.118279569892473) internal successors, (104), 93 states have internal predecessors, (104), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:22:13,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:22:13,870 INFO L93 Difference]: Finished difference Result 951 states and 1179 transitions. [2023-04-02 15:22:13,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2023-04-02 15:22:13,870 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 1.118279569892473) internal successors, (104), 93 states have internal predecessors, (104), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 443 [2023-04-02 15:22:13,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:22:13,873 INFO L225 Difference]: With dead ends: 951 [2023-04-02 15:22:13,873 INFO L226 Difference]: Without dead ends: 940 [2023-04-02 15:22:13,874 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1375 GetRequests, 1269 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2317 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=4511, Invalid=7045, Unknown=0, NotChecked=0, Total=11556 [2023-04-02 15:22:13,875 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 1135 mSDsluCounter, 327 mSDsCounter, 0 mSdLazyCounter, 540 mSolverCounterSat, 385 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1225 SdHoareTripleChecker+Valid, 344 SdHoareTripleChecker+Invalid, 925 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 385 IncrementalHoareTripleChecker+Valid, 540 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-02 15:22:13,875 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1225 Valid, 344 Invalid, 925 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [385 Valid, 540 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-04-02 15:22:13,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 940 states. [2023-04-02 15:22:13,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 940 to 494. [2023-04-02 15:22:13,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 494 states, 486 states have (on average 1.008230452674897) internal successors, (490), 486 states have internal predecessors, (490), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 15:22:13,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 494 states to 494 states and 497 transitions. [2023-04-02 15:22:13,906 INFO L78 Accepts]: Start accepts. Automaton has 494 states and 497 transitions. Word has length 443 [2023-04-02 15:22:13,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:22:13,906 INFO L495 AbstractCegarLoop]: Abstraction has 494 states and 497 transitions. [2023-04-02 15:22:13,906 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 1.118279569892473) internal successors, (104), 93 states have internal predecessors, (104), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:22:13,906 INFO L276 IsEmpty]: Start isEmpty. Operand 494 states and 497 transitions. [2023-04-02 15:22:13,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2023-04-02 15:22:13,911 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:22:13,911 INFO L195 NwaCegarLoop]: trace histogram [382, 90, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:22:13,922 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-04-02 15:22:14,122 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-04-02 15:22:14,122 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:22:14,123 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:22:14,123 INFO L85 PathProgramCache]: Analyzing trace with hash 359255956, now seen corresponding path program 12 times [2023-04-02 15:22:14,123 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:22:14,123 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [195729425] [2023-04-02 15:22:14,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:22:14,123 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:22:14,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:22:21,647 INFO L134 CoverageAnalysis]: Checked inductivity of 77248 backedges. 0 proven. 4095 refuted. 0 times theorem prover too weak. 73153 trivial. 0 not checked. [2023-04-02 15:22:21,647 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:22:21,647 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [195729425] [2023-04-02 15:22:21,647 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [195729425] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:22:21,647 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [441669533] [2023-04-02 15:22:21,647 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:22:21,648 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:22:21,648 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:22:21,649 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:22:21,650 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-04-02 15:22:22,519 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:22:22,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:22:22,548 INFO L262 TraceCheckSpWp]: Trace formula consists of 3887 conjuncts, 386 conjunts are in the unsatisfiable core [2023-04-02 15:22:22,558 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:23:20,183 INFO L134 CoverageAnalysis]: Checked inductivity of 77248 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 4095 trivial. 0 not checked. [2023-04-02 15:23:20,183 INFO L327 TraceCheckSpWp]: Computing backward predicates...