./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/loop-simple/nested_1b.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 54858612 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/loop-simple/nested_1b.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 c1836be5ce35667bc02ed393f2cbc8396b48b5bb .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 0.2.0-5485861 [2020-10-25 22:31:10,863 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-25 22:31:10,866 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-25 22:31:10,902 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-25 22:31:10,902 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-25 22:31:10,904 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-25 22:31:10,906 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-25 22:31:10,908 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-25 22:31:10,910 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-25 22:31:10,911 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-25 22:31:10,912 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-25 22:31:10,914 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-25 22:31:10,914 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-25 22:31:10,915 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-25 22:31:10,917 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-25 22:31:10,918 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-25 22:31:10,919 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-25 22:31:10,923 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-25 22:31:10,925 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-25 22:31:10,930 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-25 22:31:10,931 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-25 22:31:10,935 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-25 22:31:10,937 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-25 22:31:10,938 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-25 22:31:10,941 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-25 22:31:10,942 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-25 22:31:10,948 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-25 22:31:10,950 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-25 22:31:10,951 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-25 22:31:10,952 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-25 22:31:10,952 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-25 22:31:10,953 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-25 22:31:10,954 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-25 22:31:10,955 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-25 22:31:10,957 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-25 22:31:10,958 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-25 22:31:10,961 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-25 22:31:10,961 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-25 22:31:10,962 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-25 22:31:10,964 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-25 22:31:10,964 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-25 22:31:10,965 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-25 22:31:11,018 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-25 22:31:11,019 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-25 22:31:11,022 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-25 22:31:11,022 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-25 22:31:11,023 INFO L138 SettingsManager]: * Use SBE=true [2020-10-25 22:31:11,023 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-25 22:31:11,023 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-25 22:31:11,023 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-25 22:31:11,023 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-25 22:31:11,024 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-25 22:31:11,025 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-25 22:31:11,025 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-25 22:31:11,025 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-25 22:31:11,025 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-25 22:31:11,026 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-25 22:31:11,026 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-25 22:31:11,026 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-25 22:31:11,026 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-25 22:31:11,026 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-25 22:31:11,027 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-25 22:31:11,027 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-25 22:31:11,027 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-25 22:31:11,027 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-25 22:31:11,028 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-25 22:31:11,028 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-25 22:31:11,028 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-25 22:31:11,028 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-25 22:31:11,028 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-25 22:31:11,029 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-25 22:31:11,029 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c1836be5ce35667bc02ed393f2cbc8396b48b5bb [2020-10-25 22:31:11,413 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-25 22:31:11,443 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-25 22:31:11,448 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-25 22:31:11,449 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-25 22:31:11,451 INFO L275 PluginConnector]: CDTParser initialized [2020-10-25 22:31:11,452 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-simple/nested_1b.c [2020-10-25 22:31:11,550 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3e0a71c67/9bbe6664a4f045ebb9b9ed0f061a0286/FLAGd6fd8318e [2020-10-25 22:31:12,161 INFO L306 CDTParser]: Found 1 translation units. [2020-10-25 22:31:12,162 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-simple/nested_1b.c [2020-10-25 22:31:12,169 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3e0a71c67/9bbe6664a4f045ebb9b9ed0f061a0286/FLAGd6fd8318e [2020-10-25 22:31:12,537 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3e0a71c67/9bbe6664a4f045ebb9b9ed0f061a0286 [2020-10-25 22:31:12,540 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-25 22:31:12,547 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-10-25 22:31:12,549 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-25 22:31:12,549 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-25 22:31:12,553 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-25 22:31:12,554 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.10 10:31:12" (1/1) ... [2020-10-25 22:31:12,558 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@e8f7b25 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:31:12, skipping insertion in model container [2020-10-25 22:31:12,558 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.10 10:31:12" (1/1) ... [2020-10-25 22:31:12,566 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-25 22:31:12,579 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-25 22:31:12,770 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-25 22:31:12,780 INFO L203 MainTranslator]: Completed pre-run [2020-10-25 22:31:12,794 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-25 22:31:12,809 INFO L208 MainTranslator]: Completed translation [2020-10-25 22:31:12,810 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:31:12 WrapperNode [2020-10-25 22:31:12,810 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-25 22:31:12,811 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-10-25 22:31:12,812 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-10-25 22:31:12,812 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-10-25 22:31:12,820 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:31:12" (1/1) ... [2020-10-25 22:31:12,828 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:31:12" (1/1) ... [2020-10-25 22:31:12,844 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-10-25 22:31:12,845 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-25 22:31:12,846 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-25 22:31:12,846 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-25 22:31:12,855 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:31:12" (1/1) ... [2020-10-25 22:31:12,855 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:31:12" (1/1) ... [2020-10-25 22:31:12,856 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:31:12" (1/1) ... [2020-10-25 22:31:12,857 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:31:12" (1/1) ... [2020-10-25 22:31:12,860 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:31:12" (1/1) ... [2020-10-25 22:31:12,863 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:31:12" (1/1) ... [2020-10-25 22:31:12,865 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:31:12" (1/1) ... [2020-10-25 22:31:12,866 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-25 22:31:12,867 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-25 22:31:12,867 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-25 22:31:12,868 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-25 22:31:12,868 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:31:12" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-25 22:31:12,943 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-25 22:31:12,943 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-25 22:31:12,943 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-25 22:31:12,943 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-25 22:31:13,138 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-25 22:31:13,138 INFO L298 CfgBuilder]: Removed 7 assume(true) statements. [2020-10-25 22:31:13,140 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.10 10:31:13 BoogieIcfgContainer [2020-10-25 22:31:13,140 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-25 22:31:13,142 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-25 22:31:13,143 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-25 22:31:13,146 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-25 22:31:13,147 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.10 10:31:12" (1/3) ... [2020-10-25 22:31:13,148 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@547ef24 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.10 10:31:13, skipping insertion in model container [2020-10-25 22:31:13,148 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:31:12" (2/3) ... [2020-10-25 22:31:13,148 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@547ef24 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.10 10:31:13, skipping insertion in model container [2020-10-25 22:31:13,149 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.10 10:31:13" (3/3) ... [2020-10-25 22:31:13,150 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_1b.c [2020-10-25 22:31:13,164 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-25 22:31:13,169 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-25 22:31:13,184 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-25 22:31:13,250 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-25 22:31:13,254 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-25 22:31:13,255 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-25 22:31:13,255 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-25 22:31:13,255 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-25 22:31:13,255 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-25 22:31:13,255 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-25 22:31:13,256 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-25 22:31:13,290 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states. [2020-10-25 22:31:13,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2020-10-25 22:31:13,297 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 22:31:13,298 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2020-10-25 22:31:13,298 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 22:31:13,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 22:31:13,307 INFO L82 PathProgramCache]: Analyzing trace with hash 28696998, now seen corresponding path program 1 times [2020-10-25 22:31:13,320 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 22:31:13,321 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1849515851] [2020-10-25 22:31:13,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 22:31:13,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 22:31:13,563 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-25 22:31:13,564 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1849515851] [2020-10-25 22:31:13,565 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-25 22:31:13,565 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-25 22:31:13,566 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988939864] [2020-10-25 22:31:13,571 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-25 22:31:13,572 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 22:31:13,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-25 22:31:13,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-25 22:31:13,590 INFO L87 Difference]: Start difference. First operand 11 states. Second operand 3 states. [2020-10-25 22:31:13,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 22:31:13,626 INFO L93 Difference]: Finished difference Result 20 states and 24 transitions. [2020-10-25 22:31:13,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-25 22:31:13,628 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 5 [2020-10-25 22:31:13,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 22:31:13,637 INFO L225 Difference]: With dead ends: 20 [2020-10-25 22:31:13,638 INFO L226 Difference]: Without dead ends: 9 [2020-10-25 22:31:13,641 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-25 22:31:13,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2020-10-25 22:31:13,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 8. [2020-10-25 22:31:13,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2020-10-25 22:31:13,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2020-10-25 22:31:13,676 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 5 [2020-10-25 22:31:13,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 22:31:13,677 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2020-10-25 22:31:13,677 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-25 22:31:13,677 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2020-10-25 22:31:13,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-10-25 22:31:13,678 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 22:31:13,678 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-10-25 22:31:13,679 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-25 22:31:13,679 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 22:31:13,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 22:31:13,680 INFO L82 PathProgramCache]: Analyzing trace with hash 1809669604, now seen corresponding path program 1 times [2020-10-25 22:31:13,680 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 22:31:13,681 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [6696376] [2020-10-25 22:31:13,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 22:31:13,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 22:31:13,727 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-25 22:31:13,727 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [6696376] [2020-10-25 22:31:13,727 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470741970] [2020-10-25 22:31:13,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-25 22:31:13,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 22:31:13,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 3 conjunts are in the unsatisfiable core [2020-10-25 22:31:13,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-25 22:31:13,832 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-25 22:31:13,832 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-25 22:31:13,833 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-10-25 22:31:13,834 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1737472924] [2020-10-25 22:31:13,834 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-25 22:31:13,835 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 22:31:13,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-25 22:31:13,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-10-25 22:31:13,837 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 5 states. [2020-10-25 22:31:13,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 22:31:13,869 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2020-10-25 22:31:13,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-25 22:31:13,870 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 7 [2020-10-25 22:31:13,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 22:31:13,870 INFO L225 Difference]: With dead ends: 14 [2020-10-25 22:31:13,871 INFO L226 Difference]: Without dead ends: 11 [2020-10-25 22:31:13,872 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-10-25 22:31:13,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2020-10-25 22:31:13,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 10. [2020-10-25 22:31:13,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2020-10-25 22:31:13,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2020-10-25 22:31:13,875 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 7 [2020-10-25 22:31:13,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 22:31:13,876 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2020-10-25 22:31:13,876 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-25 22:31:13,876 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2020-10-25 22:31:13,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-10-25 22:31:13,877 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 22:31:13,877 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1] [2020-10-25 22:31:14,086 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-10-25 22:31:14,087 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 22:31:14,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 22:31:14,090 INFO L82 PathProgramCache]: Analyzing trace with hash -367607134, now seen corresponding path program 2 times [2020-10-25 22:31:14,090 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 22:31:14,090 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [911177348] [2020-10-25 22:31:14,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 22:31:14,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 22:31:14,171 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-25 22:31:14,172 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [911177348] [2020-10-25 22:31:14,172 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1554214954] [2020-10-25 22:31:14,172 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-25 22:31:14,218 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-10-25 22:31:14,218 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-25 22:31:14,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2020-10-25 22:31:14,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-25 22:31:14,250 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-25 22:31:14,250 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-25 22:31:14,250 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-10-25 22:31:14,251 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [196883611] [2020-10-25 22:31:14,251 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-25 22:31:14,251 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 22:31:14,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-25 22:31:14,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-10-25 22:31:14,253 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 6 states. [2020-10-25 22:31:14,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 22:31:14,278 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2020-10-25 22:31:14,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-25 22:31:14,278 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 9 [2020-10-25 22:31:14,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 22:31:14,279 INFO L225 Difference]: With dead ends: 16 [2020-10-25 22:31:14,279 INFO L226 Difference]: Without dead ends: 13 [2020-10-25 22:31:14,280 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-10-25 22:31:14,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-10-25 22:31:14,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 12. [2020-10-25 22:31:14,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-10-25 22:31:14,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-10-25 22:31:14,283 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 9 [2020-10-25 22:31:14,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 22:31:14,284 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-10-25 22:31:14,284 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-25 22:31:14,284 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-10-25 22:31:14,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-10-25 22:31:14,285 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 22:31:14,285 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1] [2020-10-25 22:31:14,494 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-25 22:31:14,495 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 22:31:14,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 22:31:14,497 INFO L82 PathProgramCache]: Analyzing trace with hash -1081479200, now seen corresponding path program 3 times [2020-10-25 22:31:14,497 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 22:31:14,498 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1201779844] [2020-10-25 22:31:14,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 22:31:14,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 22:31:14,554 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-25 22:31:14,554 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1201779844] [2020-10-25 22:31:14,555 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1762052254] [2020-10-25 22:31:14,555 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-25 22:31:14,621 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-10-25 22:31:14,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-25 22:31:14,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 5 conjunts are in the unsatisfiable core [2020-10-25 22:31:14,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-25 22:31:14,673 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-25 22:31:14,674 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-25 22:31:14,674 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-10-25 22:31:14,679 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43322353] [2020-10-25 22:31:14,679 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-25 22:31:14,680 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 22:31:14,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-25 22:31:14,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-10-25 22:31:14,681 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 7 states. [2020-10-25 22:31:14,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 22:31:14,717 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-10-25 22:31:14,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-25 22:31:14,718 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 11 [2020-10-25 22:31:14,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 22:31:14,719 INFO L225 Difference]: With dead ends: 18 [2020-10-25 22:31:14,719 INFO L226 Difference]: Without dead ends: 15 [2020-10-25 22:31:14,720 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-10-25 22:31:14,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-10-25 22:31:14,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2020-10-25 22:31:14,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-10-25 22:31:14,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-10-25 22:31:14,724 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2020-10-25 22:31:14,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 22:31:14,724 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-10-25 22:31:14,724 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-25 22:31:14,724 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-10-25 22:31:14,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-10-25 22:31:14,725 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 22:31:14,725 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1] [2020-10-25 22:31:14,936 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-25 22:31:14,936 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 22:31:14,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 22:31:14,937 INFO L82 PathProgramCache]: Analyzing trace with hash 82232734, now seen corresponding path program 4 times [2020-10-25 22:31:14,937 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 22:31:14,938 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1576427933] [2020-10-25 22:31:14,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 22:31:14,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 22:31:14,997 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-25 22:31:14,997 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1576427933] [2020-10-25 22:31:14,998 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [835932720] [2020-10-25 22:31:14,998 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2020-10-25 22:31:15,026 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-10-25 22:31:15,026 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-25 22:31:15,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 20 conjuncts, 6 conjunts are in the unsatisfiable core [2020-10-25 22:31:15,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-25 22:31:15,065 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-25 22:31:15,065 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-25 22:31:15,066 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-10-25 22:31:15,066 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936471471] [2020-10-25 22:31:15,066 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-25 22:31:15,067 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 22:31:15,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-25 22:31:15,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-10-25 22:31:15,068 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 8 states. [2020-10-25 22:31:15,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 22:31:15,099 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-10-25 22:31:15,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-25 22:31:15,099 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 13 [2020-10-25 22:31:15,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 22:31:15,100 INFO L225 Difference]: With dead ends: 20 [2020-10-25 22:31:15,100 INFO L226 Difference]: Without dead ends: 17 [2020-10-25 22:31:15,101 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-10-25 22:31:15,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-10-25 22:31:15,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2020-10-25 22:31:15,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-10-25 22:31:15,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-10-25 22:31:15,105 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2020-10-25 22:31:15,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 22:31:15,105 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-10-25 22:31:15,105 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-25 22:31:15,106 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-10-25 22:31:15,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-10-25 22:31:15,106 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 22:31:15,107 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1] [2020-10-25 22:31:15,317 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-25 22:31:15,318 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 22:31:15,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 22:31:15,319 INFO L82 PathProgramCache]: Analyzing trace with hash 1717904348, now seen corresponding path program 5 times [2020-10-25 22:31:15,319 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 22:31:15,320 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1977385504] [2020-10-25 22:31:15,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 22:31:15,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 22:31:15,402 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-25 22:31:15,402 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1977385504] [2020-10-25 22:31:15,403 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [645887449] [2020-10-25 22:31:15,403 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-25 22:31:15,442 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-10-25 22:31:15,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-25 22:31:15,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-25 22:31:15,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-25 22:31:15,470 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-25 22:31:15,471 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-25 22:31:15,471 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-10-25 22:31:15,471 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332330676] [2020-10-25 22:31:15,471 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-25 22:31:15,472 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 22:31:15,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-25 22:31:15,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-10-25 22:31:15,473 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 9 states. [2020-10-25 22:31:15,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 22:31:15,504 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-10-25 22:31:15,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-25 22:31:15,505 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 15 [2020-10-25 22:31:15,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 22:31:15,506 INFO L225 Difference]: With dead ends: 21 [2020-10-25 22:31:15,506 INFO L226 Difference]: Without dead ends: 18 [2020-10-25 22:31:15,506 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-10-25 22:31:15,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-10-25 22:31:15,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-10-25 22:31:15,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-10-25 22:31:15,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-10-25 22:31:15,511 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2020-10-25 22:31:15,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 22:31:15,511 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-10-25 22:31:15,511 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-25 22:31:15,511 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-10-25 22:31:15,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-10-25 22:31:15,512 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 22:31:15,512 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1] [2020-10-25 22:31:15,728 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-10-25 22:31:15,728 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 22:31:15,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 22:31:15,729 INFO L82 PathProgramCache]: Analyzing trace with hash 1640295066, now seen corresponding path program 6 times [2020-10-25 22:31:15,729 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 22:31:15,729 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [412389546] [2020-10-25 22:31:15,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 22:31:15,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-25 22:31:15,746 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-25 22:31:15,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-25 22:31:15,760 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-25 22:31:15,781 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-25 22:31:15,782 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-25 22:31:15,782 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-25 22:31:15,811 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.10 10:31:15 BoogieIcfgContainer [2020-10-25 22:31:15,811 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-25 22:31:15,812 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-10-25 22:31:15,812 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-10-25 22:31:15,812 INFO L275 PluginConnector]: Witness Printer initialized [2020-10-25 22:31:15,813 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.10 10:31:13" (3/4) ... [2020-10-25 22:31:15,815 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-10-25 22:31:15,861 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2020-10-25 22:31:15,861 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-10-25 22:31:15,864 INFO L168 Benchmark]: Toolchain (without parser) took 3320.33 ms. Allocated memory was 48.2 MB in the beginning and 75.5 MB in the end (delta: 27.3 MB). Free memory was 25.0 MB in the beginning and 51.7 MB in the end (delta: -26.7 MB). Peak memory consumption was 3.3 MB. Max. memory is 16.1 GB. [2020-10-25 22:31:15,864 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 48.2 MB. Free memory was 30.0 MB in the beginning and 30.0 MB in the end (delta: 34.4 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-10-25 22:31:15,865 INFO L168 Benchmark]: CACSL2BoogieTranslator took 261.54 ms. Allocated memory is still 48.2 MB. Free memory was 24.4 MB in the beginning and 26.9 MB in the end (delta: -2.5 MB). Peak memory consumption was 5.3 MB. Max. memory is 16.1 GB. [2020-10-25 22:31:15,866 INFO L168 Benchmark]: Boogie Procedure Inliner took 33.42 ms. Allocated memory is still 48.2 MB. Free memory was 26.9 MB in the beginning and 25.6 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-10-25 22:31:15,866 INFO L168 Benchmark]: Boogie Preprocessor took 20.80 ms. Allocated memory is still 48.2 MB. Free memory was 25.5 MB in the beginning and 24.6 MB in the end (delta: 947.8 kB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-10-25 22:31:15,867 INFO L168 Benchmark]: RCFGBuilder took 273.23 ms. Allocated memory was 48.2 MB in the beginning and 62.9 MB in the end (delta: 14.7 MB). Free memory was 24.6 MB in the beginning and 41.0 MB in the end (delta: -16.4 MB). Peak memory consumption was 7.4 MB. Max. memory is 16.1 GB. [2020-10-25 22:31:15,868 INFO L168 Benchmark]: TraceAbstraction took 2669.01 ms. Allocated memory was 62.9 MB in the beginning and 75.5 MB in the end (delta: 12.6 MB). Free memory was 40.6 MB in the beginning and 53.9 MB in the end (delta: -13.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-10-25 22:31:15,869 INFO L168 Benchmark]: Witness Printer took 49.57 ms. Allocated memory is still 75.5 MB. Free memory was 53.9 MB in the beginning and 51.7 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-10-25 22:31:15,873 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 48.2 MB. Free memory was 30.0 MB in the beginning and 30.0 MB in the end (delta: 34.4 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 261.54 ms. Allocated memory is still 48.2 MB. Free memory was 24.4 MB in the beginning and 26.9 MB in the end (delta: -2.5 MB). Peak memory consumption was 5.3 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 33.42 ms. Allocated memory is still 48.2 MB. Free memory was 26.9 MB in the beginning and 25.6 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 20.80 ms. Allocated memory is still 48.2 MB. Free memory was 25.5 MB in the beginning and 24.6 MB in the end (delta: 947.8 kB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * RCFGBuilder took 273.23 ms. Allocated memory was 48.2 MB in the beginning and 62.9 MB in the end (delta: 14.7 MB). Free memory was 24.6 MB in the beginning and 41.0 MB in the end (delta: -16.4 MB). Peak memory consumption was 7.4 MB. Max. memory is 16.1 GB. * TraceAbstraction took 2669.01 ms. Allocated memory was 62.9 MB in the beginning and 75.5 MB in the end (delta: 12.6 MB). Free memory was 40.6 MB in the beginning and 53.9 MB in the end (delta: -13.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * Witness Printer took 49.57 ms. Allocated memory is still 75.5 MB. Free memory was 53.9 MB in the beginning and 51.7 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: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L16] int a = 6; [L19] a = 0 [L19] COND TRUE a < 6 [L19] ++a [L19] COND TRUE a < 6 [L19] ++a [L19] COND TRUE a < 6 [L19] ++a [L19] COND TRUE a < 6 [L19] ++a [L19] COND TRUE a < 6 [L19] ++a [L19] COND TRUE a < 6 [L19] ++a [L19] COND FALSE !(a < 6) [L22] COND TRUE a == 6 [L13] __assert_fail("0", "nested_1b.c", 13, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 11 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.5s, OverallIterations: 7, TraceHistogramMax: 6, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 34 SDtfs, 21 SDslu, 45 SDs, 0 SdLazy, 98 SolverSat, 6 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 83 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=18occurred in iteration=6, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 5 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 132 NumberOfCodeBlocks, 131 NumberOfCodeBlocksAsserted, 21 NumberOfCheckSat, 104 ConstructedInterpolants, 0 QuantifiedInterpolants, 2664 SizeOfPredicates, 5 NumberOfNonLiveVariables, 201 ConjunctsInSsa, 25 ConjunctsInUnsatCore, 11 InterpolantComputations, 1 PerfectInterpolantSequences, 0/110 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! Received shutdown request...