/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 IntervalDomain -i ../sv-benchmarks/c/loop-acceleration/simple_4-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-03-31 23:00:38,017 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-03-31 23:00:38,020 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-03-31 23:00:38,055 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-03-31 23:00:38,056 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-03-31 23:00:38,058 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-03-31 23:00:38,062 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-03-31 23:00:38,064 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-03-31 23:00:38,066 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-03-31 23:00:38,069 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-03-31 23:00:38,070 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-03-31 23:00:38,072 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-03-31 23:00:38,072 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-03-31 23:00:38,074 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-03-31 23:00:38,075 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-03-31 23:00:38,076 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-03-31 23:00:38,077 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-03-31 23:00:38,077 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-03-31 23:00:38,079 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-03-31 23:00:38,083 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-03-31 23:00:38,084 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-03-31 23:00:38,085 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-03-31 23:00:38,086 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-03-31 23:00:38,087 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-03-31 23:00:38,094 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-03-31 23:00:38,097 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-03-31 23:00:38,098 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-03-31 23:00:38,099 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-03-31 23:00:38,100 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-03-31 23:00:38,100 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-03-31 23:00:38,101 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-03-31 23:00:38,101 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-03-31 23:00:38,101 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-03-31 23:00:38,101 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-03-31 23:00:38,102 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-03-31 23:00:38,102 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-03-31 23:00:38,104 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 [2023-03-31 23:00:38,130 INFO L113 SettingsManager]: Loading preferences was successful [2023-03-31 23:00:38,130 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-03-31 23:00:38,131 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-03-31 23:00:38,131 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-03-31 23:00:38,131 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-03-31 23:00:38,132 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-03-31 23:00:38,132 INFO L138 SettingsManager]: * User list type=DISABLED [2023-03-31 23:00:38,132 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-03-31 23:00:38,132 INFO L138 SettingsManager]: * Explicit value domain=true [2023-03-31 23:00:38,132 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-03-31 23:00:38,133 INFO L138 SettingsManager]: * Octagon Domain=false [2023-03-31 23:00:38,133 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-03-31 23:00:38,133 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-03-31 23:00:38,133 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-03-31 23:00:38,133 INFO L138 SettingsManager]: * Interval Domain=false [2023-03-31 23:00:38,133 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-03-31 23:00:38,134 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-03-31 23:00:38,134 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-03-31 23:00:38,134 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-03-31 23:00:38,134 INFO L138 SettingsManager]: * sizeof long=4 [2023-03-31 23:00:38,135 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-03-31 23:00:38,135 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-03-31 23:00:38,135 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-03-31 23:00:38,135 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-03-31 23:00:38,135 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-03-31 23:00:38,135 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-03-31 23:00:38,135 INFO L138 SettingsManager]: * sizeof long double=12 [2023-03-31 23:00:38,136 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-03-31 23:00:38,136 INFO L138 SettingsManager]: * Use constant arrays=true [2023-03-31 23:00:38,136 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-03-31 23:00:38,136 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-03-31 23:00:38,136 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-03-31 23:00:38,136 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 23:00:38,136 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-03-31 23:00:38,136 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-03-31 23:00:38,137 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-03-31 23:00:38,137 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-03-31 23:00:38,137 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-03-31 23:00:38,137 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-03-31 23:00:38,137 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-03-31 23:00:38,137 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-03-31 23:00:38,137 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> IntervalDomain [2023-03-31 23:00:38,291 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-03-31 23:00:38,306 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-03-31 23:00:38,308 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-03-31 23:00:38,309 INFO L271 PluginConnector]: Initializing CDTParser... [2023-03-31 23:00:38,309 INFO L275 PluginConnector]: CDTParser initialized [2023-03-31 23:00:38,310 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-acceleration/simple_4-1.c [2023-03-31 23:00:39,376 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-03-31 23:00:39,482 INFO L351 CDTParser]: Found 1 translation units. [2023-03-31 23:00:39,482 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-acceleration/simple_4-1.c [2023-03-31 23:00:39,486 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6e86c0130/45c847a31f374039b2c52dad3dcfefd5/FLAG6947e60fe [2023-03-31 23:00:39,498 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6e86c0130/45c847a31f374039b2c52dad3dcfefd5 [2023-03-31 23:00:39,500 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-03-31 23:00:39,501 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-03-31 23:00:39,504 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-03-31 23:00:39,504 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-03-31 23:00:39,506 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-03-31 23:00:39,506 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 11:00:39" (1/1) ... [2023-03-31 23:00:39,508 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@52d8d601 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:00:39, skipping insertion in model container [2023-03-31 23:00:39,508 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 11:00:39" (1/1) ... [2023-03-31 23:00:39,512 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-03-31 23:00:39,520 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-03-31 23:00:39,639 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/simple_4-1.c[322,335] [2023-03-31 23:00:39,647 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 23:00:39,656 INFO L203 MainTranslator]: Completed pre-run [2023-03-31 23:00:39,665 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/simple_4-1.c[322,335] [2023-03-31 23:00:39,667 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 23:00:39,677 INFO L208 MainTranslator]: Completed translation [2023-03-31 23:00:39,677 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:00:39 WrapperNode [2023-03-31 23:00:39,677 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-03-31 23:00:39,678 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-03-31 23:00:39,678 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-03-31 23:00:39,678 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-03-31 23:00:39,685 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:00:39" (1/1) ... [2023-03-31 23:00:39,685 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:00:39" (1/1) ... [2023-03-31 23:00:39,689 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:00:39" (1/1) ... [2023-03-31 23:00:39,690 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:00:39" (1/1) ... [2023-03-31 23:00:39,693 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:00:39" (1/1) ... [2023-03-31 23:00:39,695 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:00:39" (1/1) ... [2023-03-31 23:00:39,698 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:00:39" (1/1) ... [2023-03-31 23:00:39,699 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:00:39" (1/1) ... [2023-03-31 23:00:39,700 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-03-31 23:00:39,701 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-03-31 23:00:39,701 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-03-31 23:00:39,702 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-03-31 23:00:39,702 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:00:39" (1/1) ... [2023-03-31 23:00:39,708 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 23:00:39,716 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:00:39,743 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) [2023-03-31 23:00:39,763 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 [2023-03-31 23:00:39,776 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-03-31 23:00:39,776 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-03-31 23:00:39,776 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-03-31 23:00:39,776 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-03-31 23:00:39,776 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-03-31 23:00:39,777 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-03-31 23:00:39,777 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-03-31 23:00:39,777 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-03-31 23:00:39,777 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-03-31 23:00:39,777 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-03-31 23:00:39,777 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-03-31 23:00:39,777 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-03-31 23:00:39,777 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-03-31 23:00:39,777 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-03-31 23:00:39,777 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-03-31 23:00:39,777 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-03-31 23:00:39,778 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-03-31 23:00:39,825 INFO L236 CfgBuilder]: Building ICFG [2023-03-31 23:00:39,826 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-03-31 23:00:39,897 INFO L277 CfgBuilder]: Performing block encoding [2023-03-31 23:00:39,909 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-03-31 23:00:39,909 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-03-31 23:00:39,911 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 11:00:39 BoogieIcfgContainer [2023-03-31 23:00:39,911 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-03-31 23:00:39,912 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-03-31 23:00:39,912 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-03-31 23:00:39,914 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-03-31 23:00:39,914 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.03 11:00:39" (1/3) ... [2023-03-31 23:00:39,915 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52dc9ac7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 11:00:39, skipping insertion in model container [2023-03-31 23:00:39,915 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:00:39" (2/3) ... [2023-03-31 23:00:39,915 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52dc9ac7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 11:00:39, skipping insertion in model container [2023-03-31 23:00:39,915 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 11:00:39" (3/3) ... [2023-03-31 23:00:39,916 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_4-1.c [2023-03-31 23:00:39,927 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-03-31 23:00:39,927 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-03-31 23:00:39,962 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-03-31 23:00:39,967 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;@83d6a2e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-03-31 23:00:39,968 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-03-31 23:00:39,970 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) [2023-03-31 23:00:39,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-03-31 23:00:39,975 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:00:39,975 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:00:39,976 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:00:39,981 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:00:39,981 INFO L85 PathProgramCache]: Analyzing trace with hash 1387562718, now seen corresponding path program 1 times [2023-03-31 23:00:39,988 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:00:39,988 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1656793969] [2023-03-31 23:00:39,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:00:39,988 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:00:40,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:00:40,206 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:00:40,207 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:00:40,207 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1656793969] [2023-03-31 23:00:40,207 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1656793969] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 23:00:40,208 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 23:00:40,208 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-03-31 23:00:40,221 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [901870313] [2023-03-31 23:00:40,222 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 23:00:40,225 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 23:00:40,225 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:00:40,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 23:00:40,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 23:00:40,252 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) [2023-03-31 23:00:40,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:00:40,305 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2023-03-31 23:00:40,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 23:00:40,308 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 [2023-03-31 23:00:40,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:00:40,316 INFO L225 Difference]: With dead ends: 29 [2023-03-31 23:00:40,317 INFO L226 Difference]: Without dead ends: 12 [2023-03-31 23:00:40,319 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 [2023-03-31 23:00:40,322 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 [2023-03-31 23:00:40,322 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] [2023-03-31 23:00:40,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-03-31 23:00:40,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2023-03-31 23:00:40,369 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) [2023-03-31 23:00:40,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2023-03-31 23:00:40,370 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2023-03-31 23:00:40,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:00:40,371 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2023-03-31 23:00:40,371 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) [2023-03-31 23:00:40,371 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2023-03-31 23:00:40,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-03-31 23:00:40,371 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:00:40,371 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:00:40,371 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-03-31 23:00:40,372 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:00:40,372 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:00:40,372 INFO L85 PathProgramCache]: Analyzing trace with hash -646819446, now seen corresponding path program 1 times [2023-03-31 23:00:40,372 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:00:40,372 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305949275] [2023-03-31 23:00:40,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:00:40,373 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:00:40,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:00:40,526 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:00:40,526 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:00:40,527 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305949275] [2023-03-31 23:00:40,527 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [305949275] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:00:40,527 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1723068182] [2023-03-31 23:00:40,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:00:40,527 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:00:40,527 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:00:40,529 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) [2023-03-31 23:00:40,567 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-03-31 23:00:40,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:00:40,606 INFO L262 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 5 conjunts are in the unsatisfiable core [2023-03-31 23:00:40,612 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:00:40,692 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:00:40,692 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:00:40,735 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:00:40,735 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1723068182] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:00:40,736 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [989916463] [2023-03-31 23:00:40,753 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-03-31 23:00:40,753 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:00:40,756 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:00:40,759 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:00:40,761 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:00:40,837 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:00:40,860 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2023-03-31 23:00:40,899 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:00:40,912 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:00:41,098 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '152#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:00:41,101 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:00:41,101 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:00:41,105 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-03-31 23:00:41,106 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184668470] [2023-03-31 23:00:41,106 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:00:41,107 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-03-31 23:00:41,107 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:00:41,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-03-31 23:00:41,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2023-03-31 23:00:41,109 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) [2023-03-31 23:00:41,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:00:41,143 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2023-03-31 23:00:41,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-03-31 23:00:41,144 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 [2023-03-31 23:00:41,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:00:41,144 INFO L225 Difference]: With dead ends: 20 [2023-03-31 23:00:41,145 INFO L226 Difference]: Without dead ends: 15 [2023-03-31 23:00:41,145 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2023-03-31 23:00:41,147 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 23:00:41,147 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 20 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 23:00:41,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-03-31 23:00:41,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-03-31 23:00:41,155 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) [2023-03-31 23:00:41,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2023-03-31 23:00:41,156 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2023-03-31 23:00:41,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:00:41,156 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2023-03-31 23:00:41,156 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) [2023-03-31 23:00:41,157 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2023-03-31 23:00:41,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-03-31 23:00:41,157 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:00:41,157 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:00:41,162 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-03-31 23:00:41,362 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 [2023-03-31 23:00:41,363 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:00:41,363 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:00:41,363 INFO L85 PathProgramCache]: Analyzing trace with hash -114830882, now seen corresponding path program 2 times [2023-03-31 23:00:41,363 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:00:41,364 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [700860860] [2023-03-31 23:00:41,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:00:41,364 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:00:41,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:00:41,460 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:00:41,461 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:00:41,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [700860860] [2023-03-31 23:00:41,461 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [700860860] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:00:41,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1381586240] [2023-03-31 23:00:41,461 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 23:00:41,461 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:00:41,461 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:00:41,462 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) [2023-03-31 23:00:41,464 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-03-31 23:00:41,543 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-03-31 23:00:41,543 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:00:41,544 INFO L262 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 11 conjunts are in the unsatisfiable core [2023-03-31 23:00:41,545 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:00:41,584 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:00:41,584 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:00:41,659 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:00:41,660 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1381586240] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:00:41,660 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1872922079] [2023-03-31 23:00:41,663 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-03-31 23:00:41,663 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:00:41,663 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:00:41,664 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:00:41,664 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:00:41,703 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:00:41,726 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2023-03-31 23:00:41,769 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:00:41,776 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:00:41,964 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '315#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:00:41,964 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:00:41,964 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:00:41,964 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2023-03-31 23:00:41,964 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852521841] [2023-03-31 23:00:41,964 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:00:41,965 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-03-31 23:00:41,965 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:00:41,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-03-31 23:00:41,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=332, Unknown=0, NotChecked=0, Total=420 [2023-03-31 23:00:41,965 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) [2023-03-31 23:00:42,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:00:42,248 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2023-03-31 23:00:42,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-03-31 23:00:42,248 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 [2023-03-31 23:00:42,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:00:42,249 INFO L225 Difference]: With dead ends: 26 [2023-03-31 23:00:42,249 INFO L226 Difference]: Without dead ends: 21 [2023-03-31 23:00:42,249 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=154, Invalid=496, Unknown=0, NotChecked=0, Total=650 [2023-03-31 23:00:42,250 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 23:00:42,250 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 50 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 23:00:42,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-03-31 23:00:42,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-03-31 23:00:42,254 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) [2023-03-31 23:00:42,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2023-03-31 23:00:42,254 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 14 [2023-03-31 23:00:42,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:00:42,254 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2023-03-31 23:00:42,255 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) [2023-03-31 23:00:42,255 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2023-03-31 23:00:42,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-03-31 23:00:42,255 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:00:42,255 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:00:42,273 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-03-31 23:00:42,460 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 [2023-03-31 23:00:42,460 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:00:42,460 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:00:42,461 INFO L85 PathProgramCache]: Analyzing trace with hash 952726110, now seen corresponding path program 3 times [2023-03-31 23:00:42,461 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:00:42,461 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1224567688] [2023-03-31 23:00:42,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:00:42,461 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:00:42,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:00:42,662 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:00:42,662 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:00:42,662 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1224567688] [2023-03-31 23:00:42,663 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1224567688] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:00:42,663 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [521497226] [2023-03-31 23:00:42,663 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 23:00:42,663 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:00:42,663 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:00:42,664 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) [2023-03-31 23:00:42,682 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-03-31 23:00:42,716 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 23:00:42,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:00:42,717 INFO L262 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 23 conjunts are in the unsatisfiable core [2023-03-31 23:00:42,718 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:00:42,760 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:00:42,760 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:00:42,985 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:00:42,985 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [521497226] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:00:42,985 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [510644245] [2023-03-31 23:00:42,986 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-03-31 23:00:42,986 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:00:42,987 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:00:42,987 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:00:42,987 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:00:43,005 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:00:43,017 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2023-03-31 23:00:43,028 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:00:43,032 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:00:43,336 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '558#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:00:43,336 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:00:43,336 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:00:43,336 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2023-03-31 23:00:43,337 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589277186] [2023-03-31 23:00:43,337 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:00:43,337 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-03-31 23:00:43,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:00:43,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-03-31 23:00:43,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=830, Unknown=0, NotChecked=0, Total=1056 [2023-03-31 23:00:43,339 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) [2023-03-31 23:00:53,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:00:53,524 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2023-03-31 23:00:53,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-03-31 23:00:53,530 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 [2023-03-31 23:00:53,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:00:53,530 INFO L225 Difference]: With dead ends: 38 [2023-03-31 23:00:53,530 INFO L226 Difference]: Without dead ends: 33 [2023-03-31 23:00:53,531 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=502, Invalid=1390, Unknown=0, NotChecked=0, Total=1892 [2023-03-31 23:00:53,532 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-03-31 23:00:53,532 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 92 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-03-31 23:00:53,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-03-31 23:00:53,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2023-03-31 23:00:53,538 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) [2023-03-31 23:00:53,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2023-03-31 23:00:53,539 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 20 [2023-03-31 23:00:53,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:00:53,539 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2023-03-31 23:00:53,539 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) [2023-03-31 23:00:53,539 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2023-03-31 23:00:53,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-03-31 23:00:53,540 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:00:53,540 INFO L195 NwaCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:00:53,544 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-03-31 23:00:53,740 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 [2023-03-31 23:00:53,740 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:00:53,741 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:00:53,741 INFO L85 PathProgramCache]: Analyzing trace with hash -813329570, now seen corresponding path program 4 times [2023-03-31 23:00:53,741 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:00:53,741 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [107143120] [2023-03-31 23:00:53,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:00:53,741 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:00:53,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:00:54,226 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:00:54,226 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:00:54,226 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [107143120] [2023-03-31 23:00:54,226 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [107143120] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:00:54,226 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [91880348] [2023-03-31 23:00:54,226 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 23:00:54,226 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:00:54,227 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:00:54,227 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) [2023-03-31 23:00:54,229 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-03-31 23:00:54,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:00:54,261 INFO L262 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 47 conjunts are in the unsatisfiable core [2023-03-31 23:00:54,263 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:00:54,339 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:00:54,339 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:00:55,203 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:00:55,203 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [91880348] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:00:55,203 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1521344156] [2023-03-31 23:00:55,204 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-03-31 23:00:55,204 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:00:55,205 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:00:55,205 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:00:55,205 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:00:55,231 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:00:55,241 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2023-03-31 23:00:55,258 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:00:55,261 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:00:55,654 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '957#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:00:55,654 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:00:55,654 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:00:55,654 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2023-03-31 23:00:55,654 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388557039] [2023-03-31 23:00:55,654 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:00:55,655 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-03-31 23:00:55,655 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:00:55,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-03-31 23:00:55,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=718, Invalid=2474, Unknown=0, NotChecked=0, Total=3192 [2023-03-31 23:00:55,657 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) [2023-03-31 23:00:57,885 WARN L839 $PredicateComparison]: unable to prove that (and (< 1 (mod (+ c_main_~x~0 4294967256) 4294967296)) (< 1 (mod (+ c_main_~x~0 4294967280) 4294967296)) (< 1 (mod (+ 4294967274 c_main_~x~0) 4294967296)) (< 1 (mod c_main_~x~0 4294967296)) (< 1 (mod (+ 4294967294 c_main_~x~0) 4294967296)) (< 1 (mod (+ 4294967254 c_main_~x~0) 4294967296)) (< 1 (mod (+ 4294967258 c_main_~x~0) 4294967296)) (< 1 (mod (+ 4294967292 c_main_~x~0) 4294967296)) (< 1 (mod (+ 4294967286 c_main_~x~0) 4294967296)) (< 1 (mod (+ 4294967272 c_main_~x~0) 4294967296)) (< 1 (mod (+ 4294967270 c_main_~x~0) 4294967296)) (< 1 (mod (+ c_main_~x~0 4294967264) 4294967296)) (< 1 (mod (+ 4294967260 c_main_~x~0) 4294967296)) (< 1 (mod (+ 4294967288 c_main_~x~0) 4294967296)) (< 1 (mod (+ 4294967290 c_main_~x~0) 4294967296)) (< 1 (mod (+ c_main_~x~0 4294967284) 4294967296)) (< 1 (mod (+ 4294967252 c_main_~x~0) 4294967296)) (< 1 (mod (+ 4294967262 c_main_~x~0) 4294967296)) (< 1 (mod (+ 4294967276 c_main_~x~0) 4294967296)) (< 1 (mod (+ 4294967278 c_main_~x~0) 4294967296)) (< 1 (mod (+ 4294967268 c_main_~x~0) 4294967296)) (< 1 (mod (+ 4294967282 c_main_~x~0) 4294967296)) (< 1 (mod (+ 4294967266 c_main_~x~0) 4294967296))) is different from false [2023-03-31 23:01:51,166 WARN L223 SmtUtils]: Spent 31.38s on a formula simplification that was a NOOP. DAG size: 90 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)