/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/loop-acceleration/phases_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 22:05:55,816 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 22:05:55,817 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 22:05:55,838 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 22:05:55,838 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 22:05:55,840 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 22:05:55,841 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 22:05:55,842 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 22:05:55,843 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 22:05:55,843 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 22:05:55,844 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 22:05:55,844 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 22:05:55,845 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 22:05:55,845 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 22:05:55,846 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 22:05:55,846 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 22:05:55,847 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 22:05:55,847 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 22:05:55,848 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 22:05:55,850 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 22:05:55,850 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 22:05:55,851 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 22:05:55,852 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 22:05:55,852 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 22:05:55,854 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-04-02 22:05:55,857 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 22:05:55,857 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 22:05:55,858 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 22:05:55,858 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 22:05:55,859 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 22:05:55,859 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 22:05:55,859 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 22:05:55,859 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 22:05:55,859 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 22:05:55,860 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 22:05:55,860 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 22:05:55,861 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 22:05:55,875 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 22:05:55,875 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 22:05:55,876 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 22:05:55,876 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 22:05:55,876 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 22:05:55,876 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 22:05:55,880 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 22:05:55,881 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 22:05:55,881 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 22:05:55,881 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 22:05:55,881 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 22:05:55,882 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 22:05:55,882 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 22:05:55,882 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 22:05:55,882 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 22:05:55,882 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 22:05:55,882 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 22:05:55,882 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 22:05:55,883 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 22:05:55,883 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 22:05:55,883 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 22:05:55,883 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 22:05:55,883 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 22:05:55,883 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 22:05:55,883 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 22:05:55,884 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 22:05:55,884 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 22:05:55,884 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 22:05:55,884 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 22:05:55,884 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 22:05:55,884 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 22:05:55,884 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 22:05:55,884 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:05:55,884 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 22:05:55,885 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 22:05:55,885 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 22:05:55,885 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 22:05:55,885 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 22:05:55,885 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 22:05:55,885 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 22:05:55,885 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 22:05:55,885 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 22:05:56,052 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 22:05:56,066 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 22:05:56,068 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 22:05:56,068 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 22:05:56,069 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 22:05:56,070 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-acceleration/phases_1-2.c [2023-04-02 22:05:57,102 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 22:05:57,235 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 22:05:57,236 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-acceleration/phases_1-2.c [2023-04-02 22:05:57,240 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ac097f243/125d24196ccc44e49b29308a6c8b5567/FLAG6411111e3 [2023-04-02 22:05:57,254 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ac097f243/125d24196ccc44e49b29308a6c8b5567 [2023-04-02 22:05:57,256 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 22:05:57,257 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 22:05:57,261 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 22:05:57,261 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 22:05:57,263 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 22:05:57,264 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:05:57" (1/1) ... [2023-04-02 22:05:57,265 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@43ac99f8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:05:57, skipping insertion in model container [2023-04-02 22:05:57,265 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:05:57" (1/1) ... [2023-04-02 22:05:57,269 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 22:05:57,282 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 22:05:57,372 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/loop-acceleration/phases_1-2.c[322,335] [2023-04-02 22:05:57,379 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:05:57,385 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 22:05:57,393 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/loop-acceleration/phases_1-2.c[322,335] [2023-04-02 22:05:57,394 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:05:57,402 INFO L208 MainTranslator]: Completed translation [2023-04-02 22:05:57,402 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:05:57 WrapperNode [2023-04-02 22:05:57,403 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 22:05:57,403 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 22:05:57,403 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 22:05:57,403 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 22:05:57,410 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:05:57" (1/1) ... [2023-04-02 22:05:57,410 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:05:57" (1/1) ... [2023-04-02 22:05:57,413 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:05:57" (1/1) ... [2023-04-02 22:05:57,414 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:05:57" (1/1) ... [2023-04-02 22:05:57,416 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:05:57" (1/1) ... [2023-04-02 22:05:57,418 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:05:57" (1/1) ... [2023-04-02 22:05:57,418 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:05:57" (1/1) ... [2023-04-02 22:05:57,419 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:05:57" (1/1) ... [2023-04-02 22:05:57,419 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 22:05:57,420 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 22:05:57,420 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 22:05:57,420 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 22:05:57,421 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:05:57" (1/1) ... [2023-04-02 22:05:57,424 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:05:57,433 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:05:57,445 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 22:05:57,450 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 22:05:57,470 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 22:05:57,470 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 22:05:57,470 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 22:05:57,470 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 22:05:57,470 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 22:05:57,471 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 22:05:57,471 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 22:05:57,471 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 22:05:57,471 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 22:05:57,471 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 22:05:57,471 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 22:05:57,471 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 22:05:57,471 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 22:05:57,471 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 22:05:57,471 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 22:05:57,471 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 22:05:57,471 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 22:05:57,526 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 22:05:57,528 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 22:05:57,600 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 22:05:57,624 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 22:05:57,624 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-04-02 22:05:57,626 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:05:57 BoogieIcfgContainer [2023-04-02 22:05:57,626 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 22:05:57,627 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 22:05:57,627 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 22:05:57,629 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 22:05:57,630 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 10:05:57" (1/3) ... [2023-04-02 22:05:57,630 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79f39318 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:05:57, skipping insertion in model container [2023-04-02 22:05:57,630 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:05:57" (2/3) ... [2023-04-02 22:05:57,630 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79f39318 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:05:57, skipping insertion in model container [2023-04-02 22:05:57,631 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:05:57" (3/3) ... [2023-04-02 22:05:57,631 INFO L112 eAbstractionObserver]: Analyzing ICFG phases_1-2.c [2023-04-02 22:05:57,646 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 22:05:57,646 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 22:05:57,682 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 22:05:57,687 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;@62d19ea5, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 22:05:57,687 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 22:05:57,690 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 22:05:57,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-04-02 22:05:57,694 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:05:57,695 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:05:57,695 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:05:57,698 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:05:57,698 INFO L85 PathProgramCache]: Analyzing trace with hash 856397540, now seen corresponding path program 1 times [2023-04-02 22:05:57,704 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:05:57,705 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [476112207] [2023-04-02 22:05:57,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:05:57,705 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:05:57,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:05:57,861 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 22:05:57,861 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:05:57,862 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [476112207] [2023-04-02 22:05:57,862 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [476112207] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:05:57,862 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:05:57,862 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-02 22:05:57,863 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689867085] [2023-04-02 22:05:57,864 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:05:57,867 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 22:05:57,867 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:05:57,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 22:05:57,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 22:05:57,886 INFO L87 Difference]: Start difference. First operand has 17 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:05:57,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:05:57,907 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2023-04-02 22:05:57,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 22:05:57,909 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2023-04-02 22:05:57,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:05:57,913 INFO L225 Difference]: With dead ends: 29 [2023-04-02 22:05:57,914 INFO L226 Difference]: Without dead ends: 12 [2023-04-02 22:05:57,916 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 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 22:05:57,918 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:05:57,918 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 26 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:05:57,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-04-02 22:05:57,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2023-04-02 22:05:57,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:05:57,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2023-04-02 22:05:57,941 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2023-04-02 22:05:57,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:05:57,942 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2023-04-02 22:05:57,942 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:05:57,942 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2023-04-02 22:05:57,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-04-02 22:05:57,943 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:05:57,948 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:05:57,949 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 22:05:57,949 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:05:57,950 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:05:57,950 INFO L85 PathProgramCache]: Analyzing trace with hash 839916303, now seen corresponding path program 1 times [2023-04-02 22:05:57,950 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:05:57,950 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1714916614] [2023-04-02 22:05:57,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:05:57,950 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:05:57,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:05:58,138 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 22:05:58,138 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:05:58,138 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1714916614] [2023-04-02 22:05:58,138 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1714916614] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:05:58,138 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1201796019] [2023-04-02 22:05:58,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:05:58,139 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:05:58,139 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:05:58,150 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 22:05:58,152 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 22:05:58,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:05:58,198 INFO L262 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-02 22:05:58,202 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:05:58,239 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 22:05:58,239 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:05:58,527 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 22:05:58,527 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1201796019] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:05:58,527 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1781878020] [2023-04-02 22:05:58,544 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-04-02 22:05:58,545 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:05:58,554 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:05:58,558 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:05:58,558 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:05:58,628 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:05:58,678 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2023-04-02 22:05:58,703 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:05:58,711 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:05:58,928 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '155#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:05:58,931 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:05:58,931 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:05:58,931 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 7] total 10 [2023-04-02 22:05:58,932 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414865589] [2023-04-02 22:05:58,932 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:05:58,933 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-04-02 22:05:58,933 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:05:58,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-04-02 22:05:58,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2023-04-02 22:05:58,934 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand has 10 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 9 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:05:59,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:05:59,013 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2023-04-02 22:05:59,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-02 22:05:59,014 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 9 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2023-04-02 22:05:59,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:05:59,015 INFO L225 Difference]: With dead ends: 24 [2023-04-02 22:05:59,015 INFO L226 Difference]: Without dead ends: 16 [2023-04-02 22:05:59,016 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=66, Invalid=314, Unknown=0, NotChecked=0, Total=380 [2023-04-02 22:05:59,019 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 1 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:05:59,020 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 28 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:05:59,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-04-02 22:05:59,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2023-04-02 22:05:59,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 11 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:05:59,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2023-04-02 22:05:59,028 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 11 [2023-04-02 22:05:59,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:05:59,028 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2023-04-02 22:05:59,028 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 9 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:05:59,029 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2023-04-02 22:05:59,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-04-02 22:05:59,029 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:05:59,029 INFO L195 NwaCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:05:59,037 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 22:05:59,236 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 22:05:59,236 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:05:59,237 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:05:59,237 INFO L85 PathProgramCache]: Analyzing trace with hash 899760207, now seen corresponding path program 2 times [2023-04-02 22:05:59,237 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:05:59,237 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2069935106] [2023-04-02 22:05:59,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:05:59,237 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:05:59,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:05:59,548 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:05:59,548 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:05:59,548 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2069935106] [2023-04-02 22:05:59,549 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2069935106] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:05:59,550 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1160485794] [2023-04-02 22:05:59,550 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:05:59,550 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:05:59,550 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:05:59,551 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 22:05:59,553 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 22:05:59,596 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-02 22:05:59,596 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:05:59,597 INFO L262 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 16 conjunts are in the unsatisfiable core [2023-04-02 22:05:59,599 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:05:59,707 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:05:59,707 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:06:00,341 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:06:00,341 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1160485794] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:06:00,342 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1321468074] [2023-04-02 22:06:00,343 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-04-02 22:06:00,343 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:06:00,343 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:06:00,343 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:06:00,343 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:06:00,364 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:06:00,388 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2023-04-02 22:06:00,402 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:06:00,406 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:06:00,744 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '340#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:06:00,744 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:06:00,744 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:06:00,744 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 18 [2023-04-02 22:06:00,745 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849802215] [2023-04-02 22:06:00,745 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:06:00,745 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-04-02 22:06:00,745 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:06:00,746 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-04-02 22:06:00,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=532, Unknown=0, NotChecked=0, Total=650 [2023-04-02 22:06:00,746 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand has 18 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:06:02,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:06:02,308 INFO L93 Difference]: Finished difference Result 32 states and 39 transitions. [2023-04-02 22:06:02,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-04-02 22:06:02,310 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2023-04-02 22:06:02,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:06:02,311 INFO L225 Difference]: With dead ends: 32 [2023-04-02 22:06:02,311 INFO L226 Difference]: Without dead ends: 24 [2023-04-02 22:06:02,311 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 178 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=235, Invalid=887, Unknown=0, NotChecked=0, Total=1122 [2023-04-02 22:06:02,312 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 1 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:06:02,312 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 48 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:06:02,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-04-02 22:06:02,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-04-02 22:06:02,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.0526315789473684) internal successors, (20), 19 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:06:02,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2023-04-02 22:06:02,319 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 15 [2023-04-02 22:06:02,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:06:02,319 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2023-04-02 22:06:02,319 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:06:02,319 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2023-04-02 22:06:02,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-04-02 22:06:02,320 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:06:02,320 INFO L195 NwaCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:06:02,328 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-02 22:06:02,525 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 22:06:02,526 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:06:02,526 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:06:02,527 INFO L85 PathProgramCache]: Analyzing trace with hash -313152817, now seen corresponding path program 3 times [2023-04-02 22:06:02,527 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:06:02,527 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [116860583] [2023-04-02 22:06:02,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:06:02,527 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:06:02,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:06:03,167 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:06:03,168 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:06:03,168 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [116860583] [2023-04-02 22:06:03,168 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [116860583] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:06:03,168 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2103279153] [2023-04-02 22:06:03,168 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:06:03,168 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:06:03,168 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:06:03,169 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 22:06:03,171 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 22:06:03,222 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:06:03,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:06:03,223 INFO L262 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 34 conjunts are in the unsatisfiable core [2023-04-02 22:06:03,225 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:06:03,432 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:06:03,432 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:06:19,212 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:06:19,213 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2103279153] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:06:19,213 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1082890372] [2023-04-02 22:06:19,214 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-04-02 22:06:19,214 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:06:19,214 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:06:19,215 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:06:19,215 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:06:19,225 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:06:19,237 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2023-04-02 22:06:19,245 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:06:19,247 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:06:23,892 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '633#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:06:23,893 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:06:23,893 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:06:23,893 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 19] total 34 [2023-04-02 22:06:23,893 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573049587] [2023-04-02 22:06:23,893 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:06:23,893 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2023-04-02 22:06:23,893 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:06:23,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2023-04-02 22:06:23,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=346, Invalid=1371, Unknown=5, NotChecked=0, Total=1722 [2023-04-02 22:06:23,896 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand has 34 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 33 states have internal predecessors, (38), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:10:17,535 WARN L223 SmtUtils]: Spent 3.75m on a formula simplification. DAG size of input: 243 DAG size of output: 80 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)