/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 EqDomain -i ../sv-benchmarks/c/loop-acceleration/const_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 11:03:20,443 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 11:03:20,445 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 11:03:20,476 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 11:03:20,476 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 11:03:20,478 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 11:03:20,482 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 11:03:20,484 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 11:03:20,485 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 11:03:20,488 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 11:03:20,490 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 11:03:20,491 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 11:03:20,491 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 11:03:20,493 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 11:03:20,494 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 11:03:20,495 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 11:03:20,495 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 11:03:20,496 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 11:03:20,497 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 11:03:20,501 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 11:03:20,501 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 11:03:20,502 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 11:03:20,503 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 11:03:20,504 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 11:03:20,510 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-04-01 11:03:20,512 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 11:03:20,513 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 11:03:20,514 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 11:03:20,514 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 11:03:20,514 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 11:03:20,515 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 11:03:20,515 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 11:03:20,515 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 11:03:20,515 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 11:03:20,516 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 11:03:20,516 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 11:03:20,517 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 [2023-04-01 11:03:20,539 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 11:03:20,539 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 11:03:20,539 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 11:03:20,539 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 11:03:20,540 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 11:03:20,540 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 11:03:20,540 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 11:03:20,540 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 11:03:20,540 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 11:03:20,540 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 11:03:20,541 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 11:03:20,541 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 11:03:20,541 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 11:03:20,541 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 11:03:20,541 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 11:03:20,541 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 11:03:20,541 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 11:03:20,542 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 11:03:20,542 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 11:03:20,542 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 11:03:20,542 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 11:03:20,542 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 11:03:20,542 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 11:03:20,542 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 11:03:20,543 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 11:03:20,543 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 11:03:20,543 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 11:03:20,543 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 11:03:20,543 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 11:03:20,543 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 11:03:20,543 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 11:03:20,543 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 11:03:20,543 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 11:03:20,543 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 11:03:20,544 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 11:03:20,544 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 11:03:20,544 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 11:03:20,544 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 11:03:20,544 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 11:03:20,544 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 11:03:20,544 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 11:03:20,544 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 11:03:20,719 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 11:03:20,736 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 11:03:20,738 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 11:03:20,739 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 11:03:20,740 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 11:03:20,741 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-acceleration/const_1-2.c [2023-04-01 11:03:21,733 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 11:03:21,862 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 11:03:21,862 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-acceleration/const_1-2.c [2023-04-01 11:03:21,866 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1eb08ddeb/d2eaa907ab3d4b5e87f8b1ea4f91d9c3/FLAG7f13396d1 [2023-04-01 11:03:21,878 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1eb08ddeb/d2eaa907ab3d4b5e87f8b1ea4f91d9c3 [2023-04-01 11:03:21,880 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 11:03:21,881 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 11:03:21,883 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 11:03:21,883 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 11:03:21,885 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 11:03:21,886 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 11:03:21" (1/1) ... [2023-04-01 11:03:21,887 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@167517d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:21, skipping insertion in model container [2023-04-01 11:03:21,887 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 11:03:21" (1/1) ... [2023-04-01 11:03:21,891 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 11:03:21,904 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 11:03:21,984 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/const_1-2.c[321,334] [2023-04-01 11:03:21,990 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 11:03:21,996 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 11:03:22,003 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/const_1-2.c[321,334] [2023-04-01 11:03:22,005 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 11:03:22,014 INFO L208 MainTranslator]: Completed translation [2023-04-01 11:03:22,014 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:22 WrapperNode [2023-04-01 11:03:22,015 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 11:03:22,015 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 11:03:22,015 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 11:03:22,015 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 11:03:22,022 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:22" (1/1) ... [2023-04-01 11:03:22,022 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:22" (1/1) ... [2023-04-01 11:03:22,026 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:22" (1/1) ... [2023-04-01 11:03:22,027 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:22" (1/1) ... [2023-04-01 11:03:22,030 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:22" (1/1) ... [2023-04-01 11:03:22,033 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:22" (1/1) ... [2023-04-01 11:03:22,037 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:22" (1/1) ... [2023-04-01 11:03:22,037 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:22" (1/1) ... [2023-04-01 11:03:22,039 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 11:03:22,040 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 11:03:22,040 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 11:03:22,040 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 11:03:22,041 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:22" (1/1) ... [2023-04-01 11:03:22,046 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 11:03:22,052 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:03:22,070 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) [2023-04-01 11:03:22,078 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 [2023-04-01 11:03:22,101 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 11:03:22,101 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 11:03:22,101 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 11:03:22,101 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 11:03:22,101 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 11:03:22,101 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 11:03:22,101 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 11:03:22,101 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 11:03:22,101 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 11:03:22,101 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 11:03:22,101 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 11:03:22,102 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 11:03:22,102 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 11:03:22,102 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 11:03:22,102 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 11:03:22,102 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 11:03:22,102 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 11:03:22,144 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 11:03:22,145 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 11:03:22,214 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 11:03:22,226 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 11:03:22,226 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-04-01 11:03:22,227 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 11:03:22 BoogieIcfgContainer [2023-04-01 11:03:22,227 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 11:03:22,229 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 11:03:22,229 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 11:03:22,231 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 11:03:22,231 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 11:03:21" (1/3) ... [2023-04-01 11:03:22,231 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ce590c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 11:03:22, skipping insertion in model container [2023-04-01 11:03:22,231 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:22" (2/3) ... [2023-04-01 11:03:22,232 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ce590c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 11:03:22, skipping insertion in model container [2023-04-01 11:03:22,232 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 11:03:22" (3/3) ... [2023-04-01 11:03:22,233 INFO L112 eAbstractionObserver]: Analyzing ICFG const_1-2.c [2023-04-01 11:03:22,245 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 11:03:22,245 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 11:03:22,275 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 11:03:22,279 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;@7ef20883, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 11:03:22,280 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 11:03:22,283 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) [2023-04-01 11:03:22,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-04-01 11:03:22,287 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:03:22,288 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:03:22,289 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:03:22,295 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:03:22,295 INFO L85 PathProgramCache]: Analyzing trace with hash 1387562718, now seen corresponding path program 1 times [2023-04-01 11:03:22,301 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:03:22,301 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1214396002] [2023-04-01 11:03:22,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:03:22,302 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:03:22,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:03:22,454 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:03:22,454 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:03:22,455 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1214396002] [2023-04-01 11:03:22,455 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1214396002] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 11:03:22,455 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 11:03:22,455 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 11:03:22,456 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022934497] [2023-04-01 11:03:22,457 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 11:03:22,459 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 11:03:22,460 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:03:22,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 11:03:22,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 11:03:22,512 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) [2023-04-01 11:03:22,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:03:22,552 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2023-04-01 11:03:22,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 11:03:22,554 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 [2023-04-01 11:03:22,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:03:22,558 INFO L225 Difference]: With dead ends: 29 [2023-04-01 11:03:22,558 INFO L226 Difference]: Without dead ends: 12 [2023-04-01 11:03:22,560 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 [2023-04-01 11:03:22,562 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 11:03:22,563 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 27 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 11:03:22,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-04-01 11:03:22,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2023-04-01 11:03:22,582 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) [2023-04-01 11:03:22,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2023-04-01 11:03:22,584 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2023-04-01 11:03:22,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:03:22,584 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2023-04-01 11:03:22,584 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) [2023-04-01 11:03:22,584 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2023-04-01 11:03:22,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-04-01 11:03:22,585 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:03:22,585 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:03:22,585 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 11:03:22,585 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:03:22,586 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:03:22,586 INFO L85 PathProgramCache]: Analyzing trace with hash -646819446, now seen corresponding path program 1 times [2023-04-01 11:03:22,586 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:03:22,586 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1853392968] [2023-04-01 11:03:22,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:03:22,586 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:03:22,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:03:22,694 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:03:22,695 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:03:22,695 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1853392968] [2023-04-01 11:03:22,695 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1853392968] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:03:22,695 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1195068887] [2023-04-01 11:03:22,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:03:22,695 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:03:22,696 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:03:22,700 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) [2023-04-01 11:03:22,701 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-01 11:03:22,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:03:22,759 INFO L262 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 5 conjunts are in the unsatisfiable core [2023-04-01 11:03:22,762 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:03:22,787 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:03:22,788 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:03:22,829 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:03:22,829 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1195068887] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:03:22,830 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1443164970] [2023-04-01 11:03:22,862 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-04-01 11:03:22,863 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:03:22,866 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:03:22,870 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:03:22,870 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:03:22,999 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 42 for LOIs [2023-04-01 11:03:23,228 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 68 for LOIs [2023-04-01 11:03:23,284 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:03:23,290 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:03:23,845 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '152#(and (= (select |#length| 3) 12) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= 12 (select |#length| 2)) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (= |#NULL.base| 0))' at error location [2023-04-01 11:03:23,845 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:03:23,845 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:03:23,845 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-01 11:03:23,846 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435621443] [2023-04-01 11:03:23,846 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:03:23,847 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-01 11:03:23,847 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:03:23,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-01 11:03:23,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2023-04-01 11:03:23,848 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 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) [2023-04-01 11:03:23,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:03:23,874 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2023-04-01 11:03:23,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-01 11:03:23,875 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 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 11 [2023-04-01 11:03:23,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:03:23,876 INFO L225 Difference]: With dead ends: 20 [2023-04-01 11:03:23,876 INFO L226 Difference]: Without dead ends: 15 [2023-04-01 11:03:23,877 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2023-04-01 11:03:23,879 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 11:03:23,879 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 22 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 11:03:23,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-04-01 11:03:23,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-04-01 11:03:23,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:03:23,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2023-04-01 11:03:23,885 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2023-04-01 11:03:23,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:03:23,886 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2023-04-01 11:03:23,886 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 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) [2023-04-01 11:03:23,886 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2023-04-01 11:03:23,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-04-01 11:03:23,886 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:03:23,886 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:03:23,893 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-04-01 11:03:24,090 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 [2023-04-01 11:03:24,091 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:03:24,091 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:03:24,091 INFO L85 PathProgramCache]: Analyzing trace with hash -114830882, now seen corresponding path program 2 times [2023-04-01 11:03:24,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:03:24,095 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1576425833] [2023-04-01 11:03:24,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:03:24,095 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:03:24,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:03:24,247 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:03:24,248 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:03:24,248 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1576425833] [2023-04-01 11:03:24,248 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1576425833] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:03:24,248 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [287471375] [2023-04-01 11:03:24,248 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 11:03:24,248 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:03:24,248 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:03:24,250 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) [2023-04-01 11:03:24,252 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 11:03:24,289 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 11:03:24,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:03:24,290 INFO L262 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 11 conjunts are in the unsatisfiable core [2023-04-01 11:03:24,291 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:03:24,318 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:03:24,318 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:03:24,375 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:03:24,375 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [287471375] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:03:24,376 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [785312088] [2023-04-01 11:03:24,377 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-04-01 11:03:24,377 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:03:24,377 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:03:24,377 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:03:24,377 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:03:24,411 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 42 for LOIs [2023-04-01 11:03:24,504 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 68 for LOIs [2023-04-01 11:03:24,530 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:03:24,534 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:03:25,014 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '315#(and (= (select |#length| 3) 12) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= 12 (select |#length| 2)) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (= |#NULL.base| 0))' at error location [2023-04-01 11:03:25,015 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:03:25,015 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:03:25,015 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2023-04-01 11:03:25,015 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606531440] [2023-04-01 11:03:25,015 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:03:25,015 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-04-01 11:03:25,016 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:03:25,016 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-04-01 11:03:25,016 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2023-04-01 11:03:25,017 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 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) [2023-04-01 11:03:25,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:03:25,243 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2023-04-01 11:03:25,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-01 11:03:25,244 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 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 14 [2023-04-01 11:03:25,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:03:25,244 INFO L225 Difference]: With dead ends: 26 [2023-04-01 11:03:25,245 INFO L226 Difference]: Without dead ends: 21 [2023-04-01 11:03:25,245 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=136, Invalid=464, Unknown=0, NotChecked=0, Total=600 [2023-04-01 11:03:25,246 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 11:03:25,246 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 57 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 11:03:25,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-04-01 11:03:25,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-04-01 11:03:25,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.0625) internal successors, (17), 16 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:03:25,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2023-04-01 11:03:25,249 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 14 [2023-04-01 11:03:25,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:03:25,250 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2023-04-01 11:03:25,250 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 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) [2023-04-01 11:03:25,250 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2023-04-01 11:03:25,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-04-01 11:03:25,250 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:03:25,250 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:03:25,260 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-01 11:03:25,461 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 [2023-04-01 11:03:25,461 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:03:25,461 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:03:25,461 INFO L85 PathProgramCache]: Analyzing trace with hash 952726110, now seen corresponding path program 3 times [2023-04-01 11:03:25,462 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:03:25,462 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1483979374] [2023-04-01 11:03:25,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:03:25,462 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:03:25,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:03:25,672 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:03:25,672 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:03:25,672 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1483979374] [2023-04-01 11:03:25,672 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1483979374] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:03:25,672 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [666398960] [2023-04-01 11:03:25,673 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 11:03:25,673 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:03:25,673 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:03:25,677 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) [2023-04-01 11:03:25,679 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-01 11:03:25,715 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 11:03:25,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:03:25,717 INFO L262 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 23 conjunts are in the unsatisfiable core [2023-04-01 11:03:25,719 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:03:25,776 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:03:25,778 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:03:25,985 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:03:25,986 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [666398960] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:03:25,986 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [524912834] [2023-04-01 11:03:25,987 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-04-01 11:03:25,987 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:03:25,987 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:03:25,987 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:03:25,987 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:03:26,016 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 42 for LOIs [2023-04-01 11:03:26,101 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 68 for LOIs [2023-04-01 11:03:26,122 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:03:26,126 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:03:26,672 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '556#(and (= (select |#length| 3) 12) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= 12 (select |#length| 2)) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (= |#NULL.base| 0))' at error location [2023-04-01 11:03:26,673 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:03:26,673 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:03:26,673 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2023-04-01 11:03:26,673 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638619399] [2023-04-01 11:03:26,673 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:03:26,673 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-04-01 11:03:26,674 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:03:26,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-04-01 11:03:26,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=840, Unknown=0, NotChecked=0, Total=1056 [2023-04-01 11:03:26,675 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand has 25 states, 25 states have (on average 1.2) internal successors, (30), 25 states have internal predecessors, (30), 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) [2023-04-01 11:03:29,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:03:29,587 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2023-04-01 11:03:29,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-04-01 11:03:29,588 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.2) internal successors, (30), 25 states have internal predecessors, (30), 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 20 [2023-04-01 11:03:29,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:03:29,589 INFO L225 Difference]: With dead ends: 38 [2023-04-01 11:03:29,589 INFO L226 Difference]: Without dead ends: 33 [2023-04-01 11:03:29,590 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=466, Invalid=1340, Unknown=0, NotChecked=0, Total=1806 [2023-04-01 11:03:29,591 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 11:03:29,591 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 92 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 162 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 11:03:29,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-04-01 11:03:29,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2023-04-01 11:03:29,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.0357142857142858) internal successors, (29), 28 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:03:29,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2023-04-01 11:03:29,595 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 20 [2023-04-01 11:03:29,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:03:29,595 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2023-04-01 11:03:29,595 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.2) internal successors, (30), 25 states have internal predecessors, (30), 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) [2023-04-01 11:03:29,595 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2023-04-01 11:03:29,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-04-01 11:03:29,596 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:03:29,596 INFO L195 NwaCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:03:29,603 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-01 11:03:29,800 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 [2023-04-01 11:03:29,801 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:03:29,801 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:03:29,801 INFO L85 PathProgramCache]: Analyzing trace with hash -813329570, now seen corresponding path program 4 times [2023-04-01 11:03:29,801 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:03:29,801 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1206613467] [2023-04-01 11:03:29,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:03:29,802 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:03:29,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:03:30,246 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:03:30,246 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:03:30,246 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1206613467] [2023-04-01 11:03:30,247 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1206613467] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:03:30,247 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2004907234] [2023-04-01 11:03:30,247 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 11:03:30,247 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:03:30,247 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:03:30,248 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) [2023-04-01 11:03:30,249 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-01 11:03:30,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:03:30,303 INFO L262 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 47 conjunts are in the unsatisfiable core [2023-04-01 11:03:30,305 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:03:30,382 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:03:30,382 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:03:31,190 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:03:31,190 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2004907234] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:03:31,190 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [667287332] [2023-04-01 11:03:31,191 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-04-01 11:03:31,191 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:03:31,191 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:03:31,191 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:03:31,191 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:03:31,216 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 42 for LOIs [2023-04-01 11:03:31,278 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 68 for LOIs [2023-04-01 11:03:31,295 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:03:31,298 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:03:32,004 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '953#(and (= (select |#length| 3) 12) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= 12 (select |#length| 2)) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (= |#NULL.base| 0))' at error location [2023-04-01 11:03:32,005 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:03:32,005 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:03:32,005 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2023-04-01 11:03:32,005 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78578605] [2023-04-01 11:03:32,005 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:03:32,005 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-04-01 11:03:32,005 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:03:32,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-04-01 11:03:32,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=696, Invalid=2496, Unknown=0, NotChecked=0, Total=3192 [2023-04-01 11:03:32,007 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand has 49 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 49 states have internal predecessors, (54), 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)