./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/id_i20_o20-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5fbdf5bf 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/recursive-simple/id_i20_o20-2.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 25ea15f5ff8abe515b4cb496a6d70ce27fd2ceb9 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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-wip.dd.seqcomp-5fbdf5b [2021-08-29 16:32:28,707 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-29 16:32:28,709 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-29 16:32:28,738 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-08-29 16:32:28,739 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-08-29 16:32:28,741 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-08-29 16:32:28,742 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-08-29 16:32:28,746 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-08-29 16:32:28,748 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-08-29 16:32:28,751 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-08-29 16:32:28,751 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-08-29 16:32:28,759 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-08-29 16:32:28,759 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-08-29 16:32:28,761 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-08-29 16:32:28,762 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-08-29 16:32:28,781 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-08-29 16:32:28,781 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-08-29 16:32:28,782 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-08-29 16:32:28,783 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-08-29 16:32:28,784 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-08-29 16:32:28,785 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-08-29 16:32:28,786 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-08-29 16:32:28,787 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-08-29 16:32:28,788 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-08-29 16:32:28,789 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-08-29 16:32:28,789 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-08-29 16:32:28,789 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-08-29 16:32:28,790 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-08-29 16:32:28,790 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-08-29 16:32:28,791 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-08-29 16:32:28,791 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-08-29 16:32:28,791 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-08-29 16:32:28,792 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-08-29 16:32:28,796 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-08-29 16:32:28,797 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-08-29 16:32:28,798 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-08-29 16:32:28,798 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-08-29 16:32:28,798 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-08-29 16:32:28,799 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-08-29 16:32:28,800 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-08-29 16:32:28,800 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-08-29 16:32:28,819 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-08-29 16:32:28,841 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-29 16:32:28,856 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-29 16:32:28,857 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-08-29 16:32:28,857 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-08-29 16:32:28,859 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-29 16:32:28,859 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-29 16:32:28,859 INFO L138 SettingsManager]: * Use SBE=true [2021-08-29 16:32:28,859 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-29 16:32:28,859 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-29 16:32:28,860 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-29 16:32:28,860 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-29 16:32:28,860 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-29 16:32:28,860 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-08-29 16:32:28,861 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-29 16:32:28,861 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-08-29 16:32:28,861 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-29 16:32:28,861 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-08-29 16:32:28,861 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-29 16:32:28,861 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-08-29 16:32:28,861 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-29 16:32:28,862 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-29 16:32:28,862 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-29 16:32:28,862 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-29 16:32:28,862 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-29 16:32:28,862 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-29 16:32:28,862 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-08-29 16:32:28,863 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-29 16:32:28,863 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-29 16:32:28,863 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-08-29 16:32:28,863 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-08-29 16:32:28,863 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 25ea15f5ff8abe515b4cb496a6d70ce27fd2ceb9 [2021-08-29 16:32:29,237 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-29 16:32:29,268 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-29 16:32:29,270 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-29 16:32:29,271 INFO L271 PluginConnector]: Initializing CDTParser... [2021-08-29 16:32:29,271 INFO L275 PluginConnector]: CDTParser initialized [2021-08-29 16:32:29,272 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/id_i20_o20-2.c [2021-08-29 16:32:29,316 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/59c954694/8edfc97cce51464c86b7aeb34433bdb1/FLAGd328f5f5e [2021-08-29 16:32:29,694 INFO L306 CDTParser]: Found 1 translation units. [2021-08-29 16:32:29,695 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id_i20_o20-2.c [2021-08-29 16:32:29,699 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/59c954694/8edfc97cce51464c86b7aeb34433bdb1/FLAGd328f5f5e [2021-08-29 16:32:29,708 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/59c954694/8edfc97cce51464c86b7aeb34433bdb1 [2021-08-29 16:32:29,710 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-29 16:32:29,711 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-08-29 16:32:29,712 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-08-29 16:32:29,712 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-08-29 16:32:29,714 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-08-29 16:32:29,715 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.08 04:32:29" (1/1) ... [2021-08-29 16:32:29,716 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@365fead4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:29, skipping insertion in model container [2021-08-29 16:32:29,716 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.08 04:32:29" (1/1) ... [2021-08-29 16:32:29,720 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-08-29 16:32:29,727 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-08-29 16:32:29,833 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/recursive-simple/id_i20_o20-2.c[454,467] [2021-08-29 16:32:29,836 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-29 16:32:29,843 INFO L203 MainTranslator]: Completed pre-run [2021-08-29 16:32:29,854 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/recursive-simple/id_i20_o20-2.c[454,467] [2021-08-29 16:32:29,854 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-29 16:32:29,863 INFO L208 MainTranslator]: Completed translation [2021-08-29 16:32:29,864 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:29 WrapperNode [2021-08-29 16:32:29,865 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-08-29 16:32:29,866 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-08-29 16:32:29,866 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-08-29 16:32:29,866 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-08-29 16:32:29,874 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:29" (1/1) ... [2021-08-29 16:32:29,880 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:29" (1/1) ... [2021-08-29 16:32:29,897 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-08-29 16:32:29,898 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-29 16:32:29,898 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-29 16:32:29,898 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-29 16:32:29,903 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:29" (1/1) ... [2021-08-29 16:32:29,903 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:29" (1/1) ... [2021-08-29 16:32:29,904 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:29" (1/1) ... [2021-08-29 16:32:29,905 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:29" (1/1) ... [2021-08-29 16:32:29,908 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:29" (1/1) ... [2021-08-29 16:32:29,909 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:29" (1/1) ... [2021-08-29 16:32:29,912 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:29" (1/1) ... [2021-08-29 16:32:29,914 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-29 16:32:29,915 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-29 16:32:29,915 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-29 16:32:29,915 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-29 16:32:29,916 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:29" (1/1) ... [2021-08-29 16:32:29,921 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-29 16:32:29,927 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:32:29,970 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) [2021-08-29 16:32:30,010 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 [2021-08-29 16:32:30,030 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-29 16:32:30,031 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-29 16:32:30,031 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-08-29 16:32:30,031 INFO L130 BoogieDeclarations]: Found specification of procedure id [2021-08-29 16:32:30,031 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2021-08-29 16:32:30,031 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-08-29 16:32:30,146 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-29 16:32:30,146 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-08-29 16:32:30,148 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.08 04:32:30 BoogieIcfgContainer [2021-08-29 16:32:30,148 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-29 16:32:30,150 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-29 16:32:30,151 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-29 16:32:30,153 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-29 16:32:30,153 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 29.08 04:32:29" (1/3) ... [2021-08-29 16:32:30,154 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2e1ffac1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.08 04:32:30, skipping insertion in model container [2021-08-29 16:32:30,154 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:29" (2/3) ... [2021-08-29 16:32:30,154 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2e1ffac1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.08 04:32:30, skipping insertion in model container [2021-08-29 16:32:30,155 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.08 04:32:30" (3/3) ... [2021-08-29 16:32:30,156 INFO L111 eAbstractionObserver]: Analyzing ICFG id_i20_o20-2.c [2021-08-29 16:32:30,159 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-29 16:32:30,159 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-08-29 16:32:30,192 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-08-29 16:32:30,204 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 [2021-08-29 16:32:30,205 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-08-29 16:32:30,218 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-08-29 16:32:30,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-08-29 16:32:30,223 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:32:30,224 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:32:30,224 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:32:30,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:32:30,228 INFO L82 PathProgramCache]: Analyzing trace with hash -358017204, now seen corresponding path program 1 times [2021-08-29 16:32:30,234 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:32:30,235 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1994981925] [2021-08-29 16:32:30,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:30,236 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:32:30,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:30,428 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:30,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:30,458 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 16:32:30,459 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:32:30,459 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1994981925] [2021-08-29 16:32:30,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1994981925] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-29 16:32:30,460 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-29 16:32:30,460 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-29 16:32:30,461 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762200023] [2021-08-29 16:32:30,464 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-29 16:32:30,464 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:32:30,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-29 16:32:30,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-29 16:32:30,495 INFO L87 Difference]: Start difference. First operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-29 16:32:30,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:32:30,577 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2021-08-29 16:32:30,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-29 16:32:30,579 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-08-29 16:32:30,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:32:30,583 INFO L225 Difference]: With dead ends: 28 [2021-08-29 16:32:30,587 INFO L226 Difference]: Without dead ends: 15 [2021-08-29 16:32:30,589 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 35.15ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-29 16:32:30,593 INFO L928 BasicCegarLoop]: 4 mSDtfsCounter, 3 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 53.64ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.14ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 67.28ms IncrementalHoareTripleChecker+Time [2021-08-29 16:32:30,595 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 16 Invalid, 51 Unknown, 0 Unchecked, 1.14ms Time], IncrementalHoareTripleChecker [0 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 67.28ms Time] [2021-08-29 16:32:30,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-08-29 16:32:30,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-08-29 16:32:30,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.1) internal successors, (11), 11 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-08-29 16:32:30,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-08-29 16:32:30,625 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2021-08-29 16:32:30,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:32:30,625 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-08-29 16:32:30,626 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-29 16:32:30,626 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-08-29 16:32:30,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-08-29 16:32:30,627 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:32:30,627 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:32:30,627 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-29 16:32:30,628 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:32:30,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:32:30,631 INFO L82 PathProgramCache]: Analyzing trace with hash 679465686, now seen corresponding path program 1 times [2021-08-29 16:32:30,632 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:32:30,632 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [709252670] [2021-08-29 16:32:30,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:30,632 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:32:30,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:30,690 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:30,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:30,719 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:30,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:30,743 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-08-29 16:32:30,743 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:32:30,743 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [709252670] [2021-08-29 16:32:30,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [709252670] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:32:30,744 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [944048918] [2021-08-29 16:32:30,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:30,744 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:30,744 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:32:30,748 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:32:30,749 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-08-29 16:32:30,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:30,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 6 conjunts are in the unsatisfiable core [2021-08-29 16:32:30,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:32:30,867 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-08-29 16:32:30,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:32:31,007 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-29 16:32:31,008 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [944048918] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:32:31,010 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:32:31,010 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 11 [2021-08-29 16:32:31,011 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794998498] [2021-08-29 16:32:31,012 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-08-29 16:32:31,012 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:32:31,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-08-29 16:32:31,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2021-08-29 16:32:31,012 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 11 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 11 states have internal predecessors, (20), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 2 states have call predecessors, (5), 5 states have call successors, (5) [2021-08-29 16:32:31,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:32:31,086 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2021-08-29 16:32:31,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-08-29 16:32:31,086 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 11 states have internal predecessors, (20), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 2 states have call predecessors, (5), 5 states have call successors, (5) Word has length 16 [2021-08-29 16:32:31,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:32:31,087 INFO L225 Difference]: With dead ends: 22 [2021-08-29 16:32:31,087 INFO L226 Difference]: Without dead ends: 18 [2021-08-29 16:32:31,087 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 50.34ms TimeCoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2021-08-29 16:32:31,088 INFO L928 BasicCegarLoop]: 2 mSDtfsCounter, 19 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 52.17ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.78ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 57.71ms IncrementalHoareTripleChecker+Time [2021-08-29 16:32:31,088 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 3 Invalid, 51 Unknown, 0 Unchecked, 0.78ms Time], IncrementalHoareTripleChecker [5 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 57.71ms Time] [2021-08-29 16:32:31,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-08-29 16:32:31,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-08-29 16:32:31,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 13 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-08-29 16:32:31,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-08-29 16:32:31,105 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 16 [2021-08-29 16:32:31,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:32:31,105 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-08-29 16:32:31,105 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 11 states have internal predecessors, (20), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 2 states have call predecessors, (5), 5 states have call successors, (5) [2021-08-29 16:32:31,106 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-08-29 16:32:31,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-08-29 16:32:31,106 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:32:31,106 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:32:31,126 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-08-29 16:32:31,320 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:31,321 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:32:31,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:32:31,321 INFO L82 PathProgramCache]: Analyzing trace with hash -41010676, now seen corresponding path program 2 times [2021-08-29 16:32:31,322 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:32:31,322 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1144902492] [2021-08-29 16:32:31,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:31,322 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:32:31,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:31,360 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:31,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:31,395 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:31,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:31,441 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:31,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:31,451 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-08-29 16:32:31,452 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:32:31,452 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1144902492] [2021-08-29 16:32:31,452 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1144902492] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:32:31,452 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087736640] [2021-08-29 16:32:31,452 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-29 16:32:31,452 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:31,452 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:32:31,469 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:32:31,470 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-08-29 16:32:31,498 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-29 16:32:31,498 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-29 16:32:31,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 8 conjunts are in the unsatisfiable core [2021-08-29 16:32:31,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:32:31,585 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-08-29 16:32:31,585 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:32:31,813 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-08-29 16:32:31,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087736640] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:32:31,813 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:32:31,813 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 13 [2021-08-29 16:32:31,813 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891181790] [2021-08-29 16:32:31,814 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-08-29 16:32:31,814 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:32:31,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-08-29 16:32:31,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2021-08-29 16:32:31,814 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 13 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 13 states have internal predecessors, (24), 6 states have call successors, (6), 1 states have call predecessors, (6), 4 states have return successors, (8), 3 states have call predecessors, (8), 6 states have call successors, (8) [2021-08-29 16:32:31,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:32:31,869 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2021-08-29 16:32:31,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-08-29 16:32:31,870 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 13 states have internal predecessors, (24), 6 states have call successors, (6), 1 states have call predecessors, (6), 4 states have return successors, (8), 3 states have call predecessors, (8), 6 states have call successors, (8) Word has length 22 [2021-08-29 16:32:31,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:32:31,870 INFO L225 Difference]: With dead ends: 25 [2021-08-29 16:32:31,870 INFO L226 Difference]: Without dead ends: 21 [2021-08-29 16:32:31,871 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 58.12ms TimeCoverageRelationStatistics Valid=77, Invalid=163, Unknown=0, NotChecked=0, Total=240 [2021-08-29 16:32:31,871 INFO L928 BasicCegarLoop]: 2 mSDtfsCounter, 35 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 29.16ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.12ms SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 36.32ms IncrementalHoareTripleChecker+Time [2021-08-29 16:32:31,872 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 4 Invalid, 91 Unknown, 0 Unchecked, 1.12ms Time], IncrementalHoareTripleChecker [13 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 36.32ms Time] [2021-08-29 16:32:31,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-08-29 16:32:31,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-08-29 16:32:31,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 15 states have internal predecessors, (15), 2 states have call successors, (2), 1 states have call predecessors, (2), 4 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-08-29 16:32:31,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2021-08-29 16:32:31,875 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 22 [2021-08-29 16:32:31,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:32:31,875 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2021-08-29 16:32:31,876 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 13 states have internal predecessors, (24), 6 states have call successors, (6), 1 states have call predecessors, (6), 4 states have return successors, (8), 3 states have call predecessors, (8), 6 states have call successors, (8) [2021-08-29 16:32:31,876 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2021-08-29 16:32:31,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-08-29 16:32:31,876 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:32:31,876 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:32:31,910 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-08-29 16:32:32,095 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-08-29 16:32:32,095 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:32:32,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:32:32,095 INFO L82 PathProgramCache]: Analyzing trace with hash 1769866774, now seen corresponding path program 3 times [2021-08-29 16:32:32,096 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:32:32,096 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1396085806] [2021-08-29 16:32:32,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:32,096 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:32:32,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:32,119 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:32,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:32,143 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:32,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:32,156 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:32,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:32,167 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:32,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:32,176 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-08-29 16:32:32,176 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:32:32,176 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1396085806] [2021-08-29 16:32:32,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1396085806] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:32:32,176 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [180414488] [2021-08-29 16:32:32,176 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-08-29 16:32:32,176 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:32,176 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:32:32,177 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:32:32,178 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-08-29 16:32:32,208 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-08-29 16:32:32,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-29 16:32:32,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 10 conjunts are in the unsatisfiable core [2021-08-29 16:32:32,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:32:32,309 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-08-29 16:32:32,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:32:32,625 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-08-29 16:32:32,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [180414488] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:32:32,625 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:32:32,625 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11, 11] total 26 [2021-08-29 16:32:32,626 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873985593] [2021-08-29 16:32:32,626 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-08-29 16:32:32,626 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:32:32,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-08-29 16:32:32,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=550, Unknown=0, NotChecked=0, Total=650 [2021-08-29 16:32:32,627 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 26 states, 25 states have (on average 1.52) internal successors, (38), 18 states have internal predecessors, (38), 3 states have call successors, (4), 1 states have call predecessors, (4), 12 states have return successors, (12), 12 states have call predecessors, (12), 3 states have call successors, (12) [2021-08-29 16:32:32,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:32:32,831 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2021-08-29 16:32:32,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-08-29 16:32:32,832 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.52) internal successors, (38), 18 states have internal predecessors, (38), 3 states have call successors, (4), 1 states have call predecessors, (4), 12 states have return successors, (12), 12 states have call predecessors, (12), 3 states have call successors, (12) Word has length 28 [2021-08-29 16:32:32,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:32:32,833 INFO L225 Difference]: With dead ends: 39 [2021-08-29 16:32:32,833 INFO L226 Difference]: Without dead ends: 33 [2021-08-29 16:32:32,833 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 311 ImplicationChecksByTransitivity, 289.80ms TimeCoverageRelationStatistics Valid=252, Invalid=1388, Unknown=0, NotChecked=0, Total=1640 [2021-08-29 16:32:32,834 INFO L928 BasicCegarLoop]: 2 mSDtfsCounter, 13 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 56.23ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.54ms SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 67.49ms IncrementalHoareTripleChecker+Time [2021-08-29 16:32:32,834 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 11 Invalid, 178 Unknown, 0 Unchecked, 1.54ms Time], IncrementalHoareTripleChecker [14 Valid, 164 Invalid, 0 Unknown, 0 Unchecked, 67.49ms Time] [2021-08-29 16:32:32,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-08-29 16:32:32,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-08-29 16:32:32,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 22 states have (on average 1.0454545454545454) internal successors, (23), 23 states have internal predecessors, (23), 2 states have call successors, (2), 1 states have call predecessors, (2), 8 states have return successors, (9), 8 states have call predecessors, (9), 2 states have call successors, (9) [2021-08-29 16:32:32,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2021-08-29 16:32:32,838 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 28 [2021-08-29 16:32:32,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:32:32,839 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2021-08-29 16:32:32,839 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 1.52) internal successors, (38), 18 states have internal predecessors, (38), 3 states have call successors, (4), 1 states have call predecessors, (4), 12 states have return successors, (12), 12 states have call predecessors, (12), 3 states have call successors, (12) [2021-08-29 16:32:32,839 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2021-08-29 16:32:32,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-08-29 16:32:32,840 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:32:32,840 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:32:32,859 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-08-29 16:32:33,052 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:33,053 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:32:33,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:32:33,053 INFO L82 PathProgramCache]: Analyzing trace with hash -626238314, now seen corresponding path program 4 times [2021-08-29 16:32:33,053 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:32:33,053 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1071440259] [2021-08-29 16:32:33,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:33,054 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:32:33,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:33,082 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:33,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:33,105 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:33,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:33,122 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:33,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:33,137 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:33,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:33,153 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:33,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:33,166 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:33,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:33,177 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:33,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:33,188 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:33,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:33,199 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-08-29 16:32:33,199 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:32:33,199 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1071440259] [2021-08-29 16:32:33,199 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1071440259] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:32:33,199 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [484983141] [2021-08-29 16:32:33,199 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-08-29 16:32:33,199 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:33,199 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:32:33,200 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:32:33,216 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-08-29 16:32:33,252 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-08-29 16:32:33,252 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-29 16:32:33,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 18 conjunts are in the unsatisfiable core [2021-08-29 16:32:33,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:32:33,374 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-08-29 16:32:33,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:32:34,802 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-08-29 16:32:34,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [484983141] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:32:34,802 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:32:34,802 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 19] total 23 [2021-08-29 16:32:34,803 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701552738] [2021-08-29 16:32:34,803 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-08-29 16:32:34,803 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:32:34,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-08-29 16:32:34,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=365, Unknown=0, NotChecked=0, Total=506 [2021-08-29 16:32:34,804 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 23 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 23 states have internal predecessors, (44), 11 states have call successors, (11), 1 states have call predecessors, (11), 9 states have return successors, (23), 8 states have call predecessors, (23), 11 states have call successors, (23) [2021-08-29 16:32:34,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:32:34,918 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2021-08-29 16:32:34,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-08-29 16:32:34,919 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 23 states have internal predecessors, (44), 11 states have call successors, (11), 1 states have call predecessors, (11), 9 states have return successors, (23), 8 states have call predecessors, (23), 11 states have call successors, (23) Word has length 52 [2021-08-29 16:32:34,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:32:34,919 INFO L225 Difference]: With dead ends: 40 [2021-08-29 16:32:34,919 INFO L226 Difference]: Without dead ends: 36 [2021-08-29 16:32:34,920 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 148.29ms TimeCoverageRelationStatistics Valid=302, Invalid=628, Unknown=0, NotChecked=0, Total=930 [2021-08-29 16:32:34,920 INFO L928 BasicCegarLoop]: 2 mSDtfsCounter, 92 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 56.45ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.47ms SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 68.54ms IncrementalHoareTripleChecker+Time [2021-08-29 16:32:34,921 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [102 Valid, 4 Invalid, 187 Unknown, 0 Unchecked, 1.47ms Time], IncrementalHoareTripleChecker [37 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 68.54ms Time] [2021-08-29 16:32:34,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-08-29 16:32:34,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-08-29 16:32:34,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 25 states have internal predecessors, (25), 2 states have call successors, (2), 1 states have call predecessors, (2), 9 states have return successors, (10), 9 states have call predecessors, (10), 2 states have call successors, (10) [2021-08-29 16:32:34,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2021-08-29 16:32:34,925 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 52 [2021-08-29 16:32:34,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:32:34,925 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2021-08-29 16:32:34,925 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 23 states have internal predecessors, (44), 11 states have call successors, (11), 1 states have call predecessors, (11), 9 states have return successors, (23), 8 states have call predecessors, (23), 11 states have call successors, (23) [2021-08-29 16:32:34,925 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2021-08-29 16:32:34,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-08-29 16:32:34,926 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:32:34,926 INFO L513 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:32:34,945 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-08-29 16:32:35,142 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:35,143 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:32:35,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:32:35,143 INFO L82 PathProgramCache]: Analyzing trace with hash -960511412, now seen corresponding path program 5 times [2021-08-29 16:32:35,143 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:32:35,143 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [968580073] [2021-08-29 16:32:35,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:35,143 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:32:35,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:35,162 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:35,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:35,178 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:35,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:35,191 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:35,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:35,217 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:35,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:35,230 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:35,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:35,242 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:35,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:35,253 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:35,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:35,265 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:35,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:35,280 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:35,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:35,302 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-08-29 16:32:35,303 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:32:35,303 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [968580073] [2021-08-29 16:32:35,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [968580073] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:32:35,303 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [291193934] [2021-08-29 16:32:35,303 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-08-29 16:32:35,303 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:35,303 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:32:35,305 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:32:35,321 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-08-29 16:32:35,386 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2021-08-29 16:32:35,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-29 16:32:35,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 20 conjunts are in the unsatisfiable core [2021-08-29 16:32:35,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:32:35,699 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-08-29 16:32:35,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:32:37,161 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-08-29 16:32:37,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [291193934] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:32:37,161 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:32:37,161 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21, 21] total 51 [2021-08-29 16:32:37,161 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965569079] [2021-08-29 16:32:37,162 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-08-29 16:32:37,162 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:32:37,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-08-29 16:32:37,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=410, Invalid=2140, Unknown=0, NotChecked=0, Total=2550 [2021-08-29 16:32:37,164 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 51 states, 50 states have (on average 1.36) internal successors, (68), 33 states have internal predecessors, (68), 3 states have call successors, (4), 1 states have call predecessors, (4), 27 states have return successors, (27), 27 states have call predecessors, (27), 3 states have call successors, (27) [2021-08-29 16:32:37,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:32:37,569 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2021-08-29 16:32:37,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-08-29 16:32:37,570 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 50 states have (on average 1.36) internal successors, (68), 33 states have internal predecessors, (68), 3 states have call successors, (4), 1 states have call predecessors, (4), 27 states have return successors, (27), 27 states have call predecessors, (27), 3 states have call successors, (27) Word has length 58 [2021-08-29 16:32:37,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:32:37,571 INFO L225 Difference]: With dead ends: 69 [2021-08-29 16:32:37,571 INFO L226 Difference]: Without dead ends: 63 [2021-08-29 16:32:37,573 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1831 ImplicationChecksByTransitivity, 742.94ms TimeCoverageRelationStatistics Valid=1152, Invalid=6158, Unknown=0, NotChecked=0, Total=7310 [2021-08-29 16:32:37,574 INFO L928 BasicCegarLoop]: 2 mSDtfsCounter, 23 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 331 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 81.77ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.01ms SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 331 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 95.57ms IncrementalHoareTripleChecker+Time [2021-08-29 16:32:37,574 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 20 Invalid, 362 Unknown, 0 Unchecked, 2.01ms Time], IncrementalHoareTripleChecker [31 Valid, 331 Invalid, 0 Unknown, 0 Unchecked, 95.57ms Time] [2021-08-29 16:32:37,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-08-29 16:32:37,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-08-29 16:32:37,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 42 states have (on average 1.0238095238095237) internal successors, (43), 43 states have internal predecessors, (43), 2 states have call successors, (2), 1 states have call predecessors, (2), 18 states have return successors, (19), 18 states have call predecessors, (19), 2 states have call successors, (19) [2021-08-29 16:32:37,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2021-08-29 16:32:37,582 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 58 [2021-08-29 16:32:37,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:32:37,582 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2021-08-29 16:32:37,582 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 50 states have (on average 1.36) internal successors, (68), 33 states have internal predecessors, (68), 3 states have call successors, (4), 1 states have call predecessors, (4), 27 states have return successors, (27), 27 states have call predecessors, (27), 3 states have call successors, (27) [2021-08-29 16:32:37,583 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2021-08-29 16:32:37,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-08-29 16:32:37,594 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:32:37,595 INFO L513 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:32:37,614 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-08-29 16:32:37,811 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:37,812 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:32:37,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:32:37,812 INFO L82 PathProgramCache]: Analyzing trace with hash -2122437418, now seen corresponding path program 6 times [2021-08-29 16:32:37,812 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:32:37,812 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [459337626] [2021-08-29 16:32:37,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:37,812 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:32:37,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:37,860 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:37,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:37,894 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:37,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:37,938 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:37,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:37,964 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:37,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:37,986 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:37,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:38,012 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:38,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:38,035 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:38,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:38,057 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:38,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:38,081 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:38,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:38,101 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:38,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:38,123 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:38,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:38,153 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:38,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:38,171 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:38,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:38,205 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:38,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:38,224 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:38,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:38,242 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:38,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:38,258 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:38,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:38,275 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:38,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:38,291 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2021-08-29 16:32:38,292 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:32:38,292 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [459337626] [2021-08-29 16:32:38,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [459337626] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:32:38,292 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [675494017] [2021-08-29 16:32:38,292 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-08-29 16:32:38,292 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:38,292 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:32:38,309 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:32:38,369 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-08-29 16:32:38,488 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 18 check-sat command(s) [2021-08-29 16:32:38,488 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-29 16:32:38,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 38 conjunts are in the unsatisfiable core [2021-08-29 16:32:38,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:32:39,183 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2021-08-29 16:32:39,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:32:48,257 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2021-08-29 16:32:48,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [675494017] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:32:48,258 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:32:48,258 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 39, 39] total 65 [2021-08-29 16:32:48,258 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728495800] [2021-08-29 16:32:48,272 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-08-29 16:32:48,273 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:32:48,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-08-29 16:32:48,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=643, Invalid=3517, Unknown=0, NotChecked=0, Total=4160 [2021-08-29 16:32:48,274 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 65 states, 64 states have (on average 1.421875) internal successors, (91), 44 states have internal predecessors, (91), 3 states have call successors, (4), 1 states have call predecessors, (4), 38 states have return successors, (39), 39 states have call predecessors, (39), 3 states have call successors, (39) [2021-08-29 16:32:48,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:32:48,805 INFO L93 Difference]: Finished difference Result 78 states and 81 transitions. [2021-08-29 16:32:48,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-08-29 16:32:48,806 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 64 states have (on average 1.421875) internal successors, (91), 44 states have internal predecessors, (91), 3 states have call successors, (4), 1 states have call predecessors, (4), 38 states have return successors, (39), 39 states have call predecessors, (39), 3 states have call successors, (39) Word has length 112 [2021-08-29 16:32:48,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:32:48,807 INFO L225 Difference]: With dead ends: 78 [2021-08-29 16:32:48,807 INFO L226 Difference]: Without dead ends: 72 [2021-08-29 16:32:48,810 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 215 SyntacticMatches, 1 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2489 ImplicationChecksByTransitivity, 1197.25ms TimeCoverageRelationStatistics Valid=1853, Invalid=9277, Unknown=0, NotChecked=0, Total=11130 [2021-08-29 16:32:48,811 INFO L928 BasicCegarLoop]: 2 mSDtfsCounter, 26 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 74.29ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.31ms SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 86.38ms IncrementalHoareTripleChecker+Time [2021-08-29 16:32:48,811 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 11 Invalid, 304 Unknown, 0 Unchecked, 1.31ms Time], IncrementalHoareTripleChecker [29 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 86.38ms Time] [2021-08-29 16:32:48,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-08-29 16:32:48,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2021-08-29 16:32:48,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 48 states have (on average 1.0208333333333333) internal successors, (49), 49 states have internal predecessors, (49), 2 states have call successors, (2), 1 states have call predecessors, (2), 21 states have return successors, (22), 21 states have call predecessors, (22), 2 states have call successors, (22) [2021-08-29 16:32:48,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2021-08-29 16:32:48,824 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 112 [2021-08-29 16:32:48,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:32:48,825 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2021-08-29 16:32:48,825 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 64 states have (on average 1.421875) internal successors, (91), 44 states have internal predecessors, (91), 3 states have call successors, (4), 1 states have call predecessors, (4), 38 states have return successors, (39), 39 states have call predecessors, (39), 3 states have call successors, (39) [2021-08-29 16:32:48,825 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2021-08-29 16:32:48,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-08-29 16:32:48,829 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:32:48,830 INFO L513 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:32:48,849 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-08-29 16:32:49,030 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:49,030 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:32:49,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:32:49,031 INFO L82 PathProgramCache]: Analyzing trace with hash -1807457588, now seen corresponding path program 7 times [2021-08-29 16:32:49,031 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:32:49,031 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1525125801] [2021-08-29 16:32:49,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:49,031 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:32:49,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-29 16:32:49,061 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-29 16:32:49,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-29 16:32:49,107 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-29 16:32:49,108 INFO L627 BasicCegarLoop]: Counterexample is feasible [2021-08-29 16:32:49,108 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-08-29 16:32:49,109 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-08-29 16:32:49,113 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-08-29 16:32:49,171 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 29.08 04:32:49 BoogieIcfgContainer [2021-08-29 16:32:49,171 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-29 16:32:49,172 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-08-29 16:32:49,172 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-08-29 16:32:49,172 INFO L275 PluginConnector]: Witness Printer initialized [2021-08-29 16:32:49,172 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.08 04:32:30" (3/4) ... [2021-08-29 16:32:49,173 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-08-29 16:32:49,218 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-08-29 16:32:49,218 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-08-29 16:32:49,219 INFO L158 Benchmark]: Toolchain (without parser) took 19508.18ms. Allocated memory was 52.4MB in the beginning and 211.8MB in the end (delta: 159.4MB). Free memory was 30.4MB in the beginning and 78.1MB in the end (delta: -47.7MB). Peak memory consumption was 109.7MB. Max. memory is 16.1GB. [2021-08-29 16:32:49,219 INFO L158 Benchmark]: CDTParser took 0.14ms. Allocated memory is still 52.4MB. Free memory is still 34.0MB. There was no memory consumed. Max. memory is 16.1GB. [2021-08-29 16:32:49,219 INFO L158 Benchmark]: CACSL2BoogieTranslator took 153.68ms. Allocated memory is still 52.4MB. Free memory was 30.1MB in the beginning and 32.4MB in the end (delta: -2.3MB). Peak memory consumption was 5.2MB. Max. memory is 16.1GB. [2021-08-29 16:32:49,219 INFO L158 Benchmark]: Boogie Procedure Inliner took 31.08ms. Allocated memory was 52.4MB in the beginning and 69.2MB in the end (delta: 16.8MB). Free memory was 32.4MB in the beginning and 53.4MB in the end (delta: -20.9MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-08-29 16:32:49,219 INFO L158 Benchmark]: Boogie Preprocessor took 16.23ms. Allocated memory is still 69.2MB. Free memory was 53.1MB in the beginning and 52.5MB in the end (delta: 647.0kB). There was no memory consumed. Max. memory is 16.1GB. [2021-08-29 16:32:49,220 INFO L158 Benchmark]: RCFGBuilder took 233.03ms. Allocated memory is still 69.2MB. Free memory was 52.2MB in the beginning and 44.2MB in the end (delta: 8.1MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-08-29 16:32:49,220 INFO L158 Benchmark]: TraceAbstraction took 19020.97ms. Allocated memory was 69.2MB in the beginning and 211.8MB in the end (delta: 142.6MB). Free memory was 43.6MB in the beginning and 84.4MB in the end (delta: -40.8MB). Peak memory consumption was 104.4MB. Max. memory is 16.1GB. [2021-08-29 16:32:49,221 INFO L158 Benchmark]: Witness Printer took 46.60ms. Allocated memory is still 211.8MB. Free memory was 84.4MB in the beginning and 78.1MB in the end (delta: 6.3MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2021-08-29 16:32:49,222 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14ms. Allocated memory is still 52.4MB. Free memory is still 34.0MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 153.68ms. Allocated memory is still 52.4MB. Free memory was 30.1MB in the beginning and 32.4MB in the end (delta: -2.3MB). Peak memory consumption was 5.2MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 31.08ms. Allocated memory was 52.4MB in the beginning and 69.2MB in the end (delta: 16.8MB). Free memory was 32.4MB in the beginning and 53.4MB in the end (delta: -20.9MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 16.23ms. Allocated memory is still 69.2MB. Free memory was 53.1MB in the beginning and 52.5MB in the end (delta: 647.0kB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 233.03ms. Allocated memory is still 69.2MB. Free memory was 52.2MB in the beginning and 44.2MB in the end (delta: 8.1MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * TraceAbstraction took 19020.97ms. Allocated memory was 69.2MB in the beginning and 211.8MB in the end (delta: 142.6MB). Free memory was 43.6MB in the beginning and 84.4MB in the end (delta: -40.8MB). Peak memory consumption was 104.4MB. Max. memory is 16.1GB. * Witness Printer took 46.60ms. Allocated memory is still 211.8MB. Free memory was 84.4MB in the beginning and 78.1MB in the end (delta: 6.3MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.00ms ErrorAutomatonConstructionTimeTotal, 0.00ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.00ms ErrorAutomatonConstructionTimeAvg, 0.00ms ErrorAutomatonDifferenceTimeAvg, 0.00ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 15]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L12] int input = 20; [L13] CALL, EXPR id(input) VAL [\old(x)=20] [L7] COND FALSE !(x==0) VAL [\old(x)=20, x=20] [L8] CALL, EXPR id(x-1) VAL [\old(x)=19] [L7] COND FALSE !(x==0) VAL [\old(x)=19, x=19] [L8] CALL, EXPR id(x-1) VAL [\old(x)=18] [L7] COND FALSE !(x==0) VAL [\old(x)=18, x=18] [L8] CALL, EXPR id(x-1) VAL [\old(x)=17] [L7] COND FALSE !(x==0) VAL [\old(x)=17, x=17] [L8] CALL, EXPR id(x-1) VAL [\old(x)=16] [L7] COND FALSE !(x==0) VAL [\old(x)=16, x=16] [L8] CALL, EXPR id(x-1) VAL [\old(x)=15] [L7] COND FALSE !(x==0) VAL [\old(x)=15, x=15] [L8] CALL, EXPR id(x-1) VAL [\old(x)=14] [L7] COND FALSE !(x==0) VAL [\old(x)=14, x=14] [L8] CALL, EXPR id(x-1) VAL [\old(x)=13] [L7] COND FALSE !(x==0) VAL [\old(x)=13, x=13] [L8] CALL, EXPR id(x-1) VAL [\old(x)=12] [L7] COND FALSE !(x==0) VAL [\old(x)=12, x=12] [L8] CALL, EXPR id(x-1) VAL [\old(x)=11] [L7] COND FALSE !(x==0) VAL [\old(x)=11, x=11] [L8] CALL, EXPR id(x-1) VAL [\old(x)=10] [L7] COND FALSE !(x==0) VAL [\old(x)=10, x=10] [L8] CALL, EXPR id(x-1) VAL [\old(x)=9] [L7] COND FALSE !(x==0) VAL [\old(x)=9, x=9] [L8] CALL, EXPR id(x-1) VAL [\old(x)=8] [L7] COND FALSE !(x==0) VAL [\old(x)=8, x=8] [L8] CALL, EXPR id(x-1) VAL [\old(x)=7] [L7] COND FALSE !(x==0) VAL [\old(x)=7, x=7] [L8] CALL, EXPR id(x-1) VAL [\old(x)=6] [L7] COND FALSE !(x==0) VAL [\old(x)=6, x=6] [L8] CALL, EXPR id(x-1) VAL [\old(x)=5] [L7] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L8] CALL, EXPR id(x-1) VAL [\old(x)=4] [L7] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L8] CALL, EXPR id(x-1) VAL [\old(x)=3] [L7] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L8] CALL, EXPR id(x-1) VAL [\old(x)=2] [L7] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L8] CALL, EXPR id(x-1) VAL [\old(x)=1] [L7] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L8] CALL, EXPR id(x-1) VAL [\old(x)=0] [L7] COND TRUE x==0 [L7] return 0; VAL [\old(x)=0, \result=0, x=0] [L8] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=6, id(x-1)=5, x=6] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=7, id(x-1)=6, x=7] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=8, id(x-1)=7, x=8] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=9, id(x-1)=8, x=9] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=10, id(x-1)=9, x=10] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=11, id(x-1)=10, x=11] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=12, id(x-1)=11, x=12] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=13, id(x-1)=12, x=13] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=14, id(x-1)=13, x=14] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=15, id(x-1)=14, x=15] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=16, id(x-1)=15, x=16] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=17, id(x-1)=16, x=17] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=18, id(x-1)=17, x=18] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=19, id(x-1)=18, x=19] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=20, id(x-1)=19, x=20] [L8] return id(x-1) + 1; [L13] RET, EXPR id(input) [L13] int result = id(input); [L14] COND TRUE result == 20 [L15] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 16 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 18920.91ms, OverallIterations: 8, TraceHistogramMax: 21, EmptinessCheckTime: 29.36ms, AutomataDifference: 1545.19ms, DeadEndRemovalTime: 0.00ms, HoareAnnotationTime: 0.00ms, InitialAbstractionConstructionTime: 8.09ms, PartialOrderReductionTime: 0.00ms, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 293 SdHoareTripleChecker+Valid, 479.28ms IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 211 mSDsluCounter, 69 SdHoareTripleChecker+Invalid, 403.70ms Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 515 mSDsCounter, 129 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 1095 IncrementalHoareTripleChecker+Invalid, 1224 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 129 mSolverCounterUnsat, 16 mSDtfsCounter, 1095 mSolverCounterSat, 9.37ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 825 GetRequests, 540 SyntacticMatches, 1 SemanticMatches, 284 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4888 ImplicationChecksByTransitivity, 2521.88ms Time, 0.00ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=72occurred in iteration=7, InterpolantAutomatonStates: 133, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.00ms DumpTime, AutomataMinimizationStatistics: 66.28ms AutomataMinimizationTime, 7 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 53.91ms SsaConstructionTime, 218.27ms SatisfiabilityAnalysisTime, 15194.17ms InterpolantComputationTime, 716 NumberOfCodeBlocks, 716 NumberOfCodeBlocksAsserted, 44 NumberOfCheckSat, 855 ConstructedInterpolants, 0 QuantifiedInterpolants, 2015 SizeOfPredicates, 13 NumberOfNonLiveVariables, 850 ConjunctsInSsa, 100 ConjunctsInUnsatCore, 19 InterpolantComputations, 1 PerfectInterpolantSequences, 1875/3858 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! [2021-08-29 16:32:49,260 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...