./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/loops/nec20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 20ed64ec Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/loops/nec20.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash b24dfa0dd4504b10530e4ddbc9574e106897fa2d .................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-20ed64e [2021-08-26 03:10:01,699 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-26 03:10:01,701 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-26 03:10:01,748 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-08-26 03:10:01,748 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-08-26 03:10:01,749 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-08-26 03:10:01,750 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-08-26 03:10:01,752 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-08-26 03:10:01,753 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-08-26 03:10:01,754 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-08-26 03:10:01,754 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-08-26 03:10:01,755 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-08-26 03:10:01,755 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-08-26 03:10:01,756 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-08-26 03:10:01,757 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-08-26 03:10:01,758 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-08-26 03:10:01,758 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-08-26 03:10:01,759 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-08-26 03:10:01,760 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-08-26 03:10:01,763 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-08-26 03:10:01,764 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-08-26 03:10:01,771 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-08-26 03:10:01,772 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-08-26 03:10:01,773 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-08-26 03:10:01,775 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-08-26 03:10:01,779 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-08-26 03:10:01,779 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-08-26 03:10:01,780 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-08-26 03:10:01,781 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-08-26 03:10:01,781 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-08-26 03:10:01,782 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-08-26 03:10:01,782 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-08-26 03:10:01,783 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-08-26 03:10:01,785 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-08-26 03:10:01,786 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-08-26 03:10:01,786 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-08-26 03:10:01,787 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-08-26 03:10:01,787 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-08-26 03:10:01,787 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-08-26 03:10:01,788 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-08-26 03:10:01,789 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-08-26 03:10:01,790 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-08-26 03:10:01,814 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-26 03:10:01,816 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-26 03:10:01,816 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-08-26 03:10:01,817 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-08-26 03:10:01,818 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-26 03:10:01,818 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-26 03:10:01,818 INFO L138 SettingsManager]: * Use SBE=true [2021-08-26 03:10:01,819 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-26 03:10:01,819 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-26 03:10:01,819 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-26 03:10:01,819 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-26 03:10:01,820 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-26 03:10:01,820 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-08-26 03:10:01,820 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-26 03:10:01,820 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-08-26 03:10:01,820 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-26 03:10:01,821 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-08-26 03:10:01,821 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-26 03:10:01,821 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-08-26 03:10:01,821 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-26 03:10:01,821 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-26 03:10:01,821 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-26 03:10:01,821 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-26 03:10:01,822 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-26 03:10:01,822 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-26 03:10:01,822 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-08-26 03:10:01,822 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-26 03:10:01,822 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-26 03:10:01,822 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-08-26 03:10:01,822 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-08-26 03:10:01,823 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b24dfa0dd4504b10530e4ddbc9574e106897fa2d [2021-08-26 03:10:02,093 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-26 03:10:02,119 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-26 03:10:02,121 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-26 03:10:02,122 INFO L271 PluginConnector]: Initializing CDTParser... [2021-08-26 03:10:02,123 INFO L275 PluginConnector]: CDTParser initialized [2021-08-26 03:10:02,124 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops/nec20.c [2021-08-26 03:10:02,178 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6d1a9f6b3/3c370614b8ef4189947372d1b60441e6/FLAG5d7eceebc [2021-08-26 03:10:02,572 INFO L306 CDTParser]: Found 1 translation units. [2021-08-26 03:10:02,573 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops/nec20.c [2021-08-26 03:10:02,577 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6d1a9f6b3/3c370614b8ef4189947372d1b60441e6/FLAG5d7eceebc [2021-08-26 03:10:02,589 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6d1a9f6b3/3c370614b8ef4189947372d1b60441e6 [2021-08-26 03:10:02,591 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-26 03:10:02,592 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-08-26 03:10:02,593 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-08-26 03:10:02,593 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-08-26 03:10:02,595 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-08-26 03:10:02,596 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 03:10:02" (1/1) ... [2021-08-26 03:10:02,597 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@49c0f51d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:10:02, skipping insertion in model container [2021-08-26 03:10:02,597 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 03:10:02" (1/1) ... [2021-08-26 03:10:02,601 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-08-26 03:10:02,611 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-08-26 03:10:02,713 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops/nec20.c[356,369] [2021-08-26 03:10:02,726 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-26 03:10:02,731 INFO L203 MainTranslator]: Completed pre-run [2021-08-26 03:10:02,745 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops/nec20.c[356,369] [2021-08-26 03:10:02,775 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-26 03:10:02,787 INFO L208 MainTranslator]: Completed translation [2021-08-26 03:10:02,788 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:10:02 WrapperNode [2021-08-26 03:10:02,789 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-08-26 03:10:02,790 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-08-26 03:10:02,791 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-08-26 03:10:02,791 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-08-26 03:10:02,796 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:10:02" (1/1) ... [2021-08-26 03:10:02,801 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:10:02" (1/1) ... [2021-08-26 03:10:02,817 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-08-26 03:10:02,818 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-26 03:10:02,818 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-26 03:10:02,818 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-26 03:10:02,824 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:10:02" (1/1) ... [2021-08-26 03:10:02,824 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:10:02" (1/1) ... [2021-08-26 03:10:02,831 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:10:02" (1/1) ... [2021-08-26 03:10:02,831 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:10:02" (1/1) ... [2021-08-26 03:10:02,839 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:10:02" (1/1) ... [2021-08-26 03:10:02,843 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:10:02" (1/1) ... [2021-08-26 03:10:02,846 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:10:02" (1/1) ... [2021-08-26 03:10:02,849 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-26 03:10:02,850 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-26 03:10:02,850 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-26 03:10:02,850 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-26 03:10:02,851 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:10:02" (1/1) ... [2021-08-26 03:10:02,857 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-26 03:10:02,862 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 03:10:02,878 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) [2021-08-26 03:10:02,907 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 [2021-08-26 03:10:02,925 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-08-26 03:10:02,926 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-08-26 03:10:02,926 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-26 03:10:02,926 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-26 03:10:03,174 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-26 03:10:03,174 INFO L299 CfgBuilder]: Removed 7 assume(true) statements. [2021-08-26 03:10:03,175 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 03:10:03 BoogieIcfgContainer [2021-08-26 03:10:03,175 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-26 03:10:03,176 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-26 03:10:03,177 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-26 03:10:03,179 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-26 03:10:03,179 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 03:10:02" (1/3) ... [2021-08-26 03:10:03,179 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4669e1ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 03:10:03, skipping insertion in model container [2021-08-26 03:10:03,179 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 03:10:02" (2/3) ... [2021-08-26 03:10:03,179 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4669e1ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 03:10:03, skipping insertion in model container [2021-08-26 03:10:03,180 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 03:10:03" (3/3) ... [2021-08-26 03:10:03,181 INFO L111 eAbstractionObserver]: Analyzing ICFG nec20.c [2021-08-26 03:10:03,184 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-26 03:10:03,184 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-08-26 03:10:03,232 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-08-26 03:10:03,239 INFO L339 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, mConcurrency=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, mLoopAccelerationTechnique=FAST_UPR [2021-08-26 03:10:03,239 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-08-26 03:10:03,251 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 14 states have (on average 1.5) internal successors, (21), 15 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 03:10:03,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-08-26 03:10:03,254 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 03:10:03,255 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 03:10:03,256 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 03:10:03,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 03:10:03,264 INFO L82 PathProgramCache]: Analyzing trace with hash -592064849, now seen corresponding path program 1 times [2021-08-26 03:10:03,271 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 03:10:03,271 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812871152] [2021-08-26 03:10:03,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 03:10:03,273 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 03:10:03,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 03:10:03,493 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 03:10:03,493 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 03:10:03,494 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1812871152] [2021-08-26 03:10:03,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1812871152] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 03:10:03,494 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 03:10:03,494 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-08-26 03:10:03,496 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998032114] [2021-08-26 03:10:03,498 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-08-26 03:10:03,499 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 03:10:03,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-08-26 03:10:03,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-08-26 03:10:03,511 INFO L87 Difference]: Start difference. First operand has 16 states, 14 states have (on average 1.5) internal successors, (21), 15 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 03:10:03,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 03:10:03,528 INFO L93 Difference]: Finished difference Result 30 states and 37 transitions. [2021-08-26 03:10:03,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-08-26 03:10:03,529 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-08-26 03:10:03,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 03:10:03,534 INFO L225 Difference]: With dead ends: 30 [2021-08-26 03:10:03,534 INFO L226 Difference]: Without dead ends: 11 [2021-08-26 03:10:03,536 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-08-26 03:10:03,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2021-08-26 03:10:03,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2021-08-26 03:10:03,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 03:10:03,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2021-08-26 03:10:03,554 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 9 [2021-08-26 03:10:03,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 03:10:03,555 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2021-08-26 03:10:03,555 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 03:10:03,555 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2021-08-26 03:10:03,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-08-26 03:10:03,556 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 03:10:03,556 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 03:10:03,556 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-26 03:10:03,556 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 03:10:03,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 03:10:03,557 INFO L82 PathProgramCache]: Analyzing trace with hash -1172475752, now seen corresponding path program 1 times [2021-08-26 03:10:03,557 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 03:10:03,557 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [184766354] [2021-08-26 03:10:03,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 03:10:03,558 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 03:10:03,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-26 03:10:03,576 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-26 03:10:03,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-26 03:10:03,621 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-26 03:10:03,621 INFO L626 BasicCegarLoop]: Counterexample is feasible [2021-08-26 03:10:03,622 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-08-26 03:10:03,624 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-08-26 03:10:03,627 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-08-26 03:10:03,644 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 26.08 03:10:03 BoogieIcfgContainer [2021-08-26 03:10:03,645 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-26 03:10:03,645 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-08-26 03:10:03,645 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-08-26 03:10:03,645 INFO L275 PluginConnector]: Witness Printer initialized [2021-08-26 03:10:03,646 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 03:10:03" (3/4) ... [2021-08-26 03:10:03,647 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-08-26 03:10:03,671 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-08-26 03:10:03,671 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-08-26 03:10:03,672 INFO L168 Benchmark]: Toolchain (without parser) took 1080.22 ms. Allocated memory was 62.9 MB in the beginning and 75.5 MB in the end (delta: 12.6 MB). Free memory was 43.9 MB in the beginning and 53.5 MB in the end (delta: -9.6 MB). Peak memory consumption was 3.0 MB. Max. memory is 16.1 GB. [2021-08-26 03:10:03,673 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 62.9 MB. Free memory is still 45.3 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-08-26 03:10:03,673 INFO L168 Benchmark]: CACSL2BoogieTranslator took 197.04 ms. Allocated memory is still 62.9 MB. Free memory was 43.7 MB in the beginning and 46.4 MB in the end (delta: -2.7 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2021-08-26 03:10:03,673 INFO L168 Benchmark]: Boogie Procedure Inliner took 26.78 ms. Allocated memory is still 62.9 MB. Free memory was 46.2 MB in the beginning and 44.9 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-26 03:10:03,674 INFO L168 Benchmark]: Boogie Preprocessor took 31.19 ms. Allocated memory is still 62.9 MB. Free memory was 44.7 MB in the beginning and 43.7 MB in the end (delta: 1.0 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-26 03:10:03,674 INFO L168 Benchmark]: RCFGBuilder took 325.82 ms. Allocated memory is still 62.9 MB. Free memory was 43.7 MB in the beginning and 31.2 MB in the end (delta: 12.5 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2021-08-26 03:10:03,674 INFO L168 Benchmark]: TraceAbstraction took 468.19 ms. Allocated memory was 62.9 MB in the beginning and 75.5 MB in the end (delta: 12.6 MB). Free memory was 30.8 MB in the beginning and 55.6 MB in the end (delta: -24.8 MB). Peak memory consumption was 12.7 MB. Max. memory is 16.1 GB. [2021-08-26 03:10:03,675 INFO L168 Benchmark]: Witness Printer took 26.28 ms. Allocated memory is still 75.5 MB. Free memory was 55.6 MB in the beginning and 53.5 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-08-26 03:10:03,676 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 62.9 MB. Free memory is still 45.3 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 197.04 ms. Allocated memory is still 62.9 MB. Free memory was 43.7 MB in the beginning and 46.4 MB in the end (delta: -2.7 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 26.78 ms. Allocated memory is still 62.9 MB. Free memory was 46.2 MB in the beginning and 44.9 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 31.19 ms. Allocated memory is still 62.9 MB. Free memory was 44.7 MB in the beginning and 43.7 MB in the end (delta: 1.0 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 325.82 ms. Allocated memory is still 62.9 MB. Free memory was 43.7 MB in the beginning and 31.2 MB in the end (delta: 12.5 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 468.19 ms. Allocated memory was 62.9 MB in the beginning and 75.5 MB in the end (delta: 12.6 MB). Free memory was 30.8 MB in the beginning and 55.6 MB in the end (delta: -24.8 MB). Peak memory consumption was 12.7 MB. Max. memory is 16.1 GB. * Witness Printer took 26.28 ms. Allocated memory is still 75.5 MB. Free memory was 55.6 MB in the beginning and 53.5 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 8]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L12] int b; VAL [b=0] [L15] _Bool k=__VERIFIER_nondet_bool(); [L16] unsigned int i,n,j; [L17] int a[1025]; VAL [b=0] [L19] COND TRUE \read(k) [L20] n=0 VAL [b=0] [L25] i=0 [L26] j=__VERIFIER_nondet_uint() [L27] COND FALSE !(j > 10000) VAL [b=0] [L30] COND TRUE i <= n [L31] i++ [L32] j= j +2 VAL [b=0] [L30] COND FALSE !(i <= n) VAL [b=0] [L35] a[i]=0 [L7] COND TRUE !(cond) VAL [b=0] [L8] reach_error() VAL [b=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 16 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 395.7ms, OverallIterations: 2, TraceHistogramMax: 1, EmptinessCheckTime: 6.6ms, AutomataDifference: 36.5ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 8.8ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 18 SDtfs, 3 SDslu, 12 SDs, 0 SdLazy, 5 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 4.7ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.0ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=16occurred in iteration=0, InterpolantAutomatonStates: 3, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 9.9ms AutomataMinimizationTime, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 10.0ms SsaConstructionTime, 67.8ms SatisfiabilityAnalysisTime, 115.2ms InterpolantComputationTime, 19 NumberOfCodeBlocks, 19 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 8 ConstructedInterpolants, 0 QuantifiedInterpolants, 12 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-08-26 03:10:03,705 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...