./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/id_o3.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 20ed64ec Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/recursive-simple/id_o3.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 02fc4bd1d36800792ed4ab31b3ee599492a65576 .................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-20ed64e [2021-08-26 09:01:12,473 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-26 09:01:12,476 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-26 09:01:12,508 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-08-26 09:01:12,509 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-08-26 09:01:12,510 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-08-26 09:01:12,510 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-08-26 09:01:12,512 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-08-26 09:01:12,518 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-08-26 09:01:12,521 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-08-26 09:01:12,522 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-08-26 09:01:12,523 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-08-26 09:01:12,524 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-08-26 09:01:12,525 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-08-26 09:01:12,527 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-08-26 09:01:12,528 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-08-26 09:01:12,529 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-08-26 09:01:12,530 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-08-26 09:01:12,533 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-08-26 09:01:12,535 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-08-26 09:01:12,541 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-08-26 09:01:12,542 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-08-26 09:01:12,542 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-08-26 09:01:12,544 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-08-26 09:01:12,546 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-08-26 09:01:12,549 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-08-26 09:01:12,550 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-08-26 09:01:12,550 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-08-26 09:01:12,551 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-08-26 09:01:12,551 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-08-26 09:01:12,551 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-08-26 09:01:12,552 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-08-26 09:01:12,553 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-08-26 09:01:12,553 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-08-26 09:01:12,554 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-08-26 09:01:12,554 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-08-26 09:01:12,555 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-08-26 09:01:12,555 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-08-26 09:01:12,555 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-08-26 09:01:12,556 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-08-26 09:01:12,556 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-08-26 09:01:12,558 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-08-26 09:01:12,584 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-26 09:01:12,584 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-26 09:01:12,585 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-08-26 09:01:12,585 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-08-26 09:01:12,587 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-26 09:01:12,587 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-26 09:01:12,587 INFO L138 SettingsManager]: * Use SBE=true [2021-08-26 09:01:12,587 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-26 09:01:12,588 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-26 09:01:12,588 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-26 09:01:12,588 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-26 09:01:12,589 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-26 09:01:12,589 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-08-26 09:01:12,589 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-26 09:01:12,589 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-08-26 09:01:12,589 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-26 09:01:12,589 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-08-26 09:01:12,589 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-26 09:01:12,590 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-08-26 09:01:12,590 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-26 09:01:12,590 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-26 09:01:12,590 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-26 09:01:12,590 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-26 09:01:12,590 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-26 09:01:12,591 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-26 09:01:12,591 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-08-26 09:01:12,591 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-26 09:01:12,591 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-26 09:01:12,591 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-08-26 09:01:12,591 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-08-26 09:01:12,592 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 02fc4bd1d36800792ed4ab31b3ee599492a65576 [2021-08-26 09:01:12,882 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-26 09:01:12,903 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-26 09:01:12,905 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-26 09:01:12,906 INFO L271 PluginConnector]: Initializing CDTParser... [2021-08-26 09:01:12,906 INFO L275 PluginConnector]: CDTParser initialized [2021-08-26 09:01:12,907 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/id_o3.c [2021-08-26 09:01:12,965 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/92c9605ab/eadc6df3e826429fa9d6ba07aec03479/FLAG05cb38e51 [2021-08-26 09:01:13,318 INFO L306 CDTParser]: Found 1 translation units. [2021-08-26 09:01:13,318 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id_o3.c [2021-08-26 09:01:13,322 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/92c9605ab/eadc6df3e826429fa9d6ba07aec03479/FLAG05cb38e51 [2021-08-26 09:01:13,765 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/92c9605ab/eadc6df3e826429fa9d6ba07aec03479 [2021-08-26 09:01:13,768 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-26 09:01:13,769 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-08-26 09:01:13,771 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-08-26 09:01:13,771 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-08-26 09:01:13,787 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-08-26 09:01:13,788 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 09:01:13" (1/1) ... [2021-08-26 09:01:13,789 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@26e79f83 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:13, skipping insertion in model container [2021-08-26 09:01:13,789 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 09:01:13" (1/1) ... [2021-08-26 09:01:13,794 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-08-26 09:01:13,801 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-08-26 09:01:13,883 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_o3.c[514,527] [2021-08-26 09:01:13,886 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-26 09:01:13,891 INFO L203 MainTranslator]: Completed pre-run [2021-08-26 09:01:13,912 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_o3.c[514,527] [2021-08-26 09:01:13,912 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-26 09:01:13,920 INFO L208 MainTranslator]: Completed translation [2021-08-26 09:01:13,921 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:13 WrapperNode [2021-08-26 09:01:13,921 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-08-26 09:01:13,922 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-08-26 09:01:13,922 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-08-26 09:01:13,922 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-08-26 09:01:13,948 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:13" (1/1) ... [2021-08-26 09:01:13,962 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:13" (1/1) ... [2021-08-26 09:01:13,974 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-08-26 09:01:13,975 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-26 09:01:13,975 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-26 09:01:13,975 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-26 09:01:13,980 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:13" (1/1) ... [2021-08-26 09:01:13,980 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:13" (1/1) ... [2021-08-26 09:01:13,982 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:13" (1/1) ... [2021-08-26 09:01:13,982 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:13" (1/1) ... [2021-08-26 09:01:13,986 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:13" (1/1) ... [2021-08-26 09:01:13,987 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:13" (1/1) ... [2021-08-26 09:01:13,991 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:13" (1/1) ... [2021-08-26 09:01:13,993 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-26 09:01:13,995 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-26 09:01:13,995 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-26 09:01:13,995 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-26 09:01:13,996 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:13" (1/1) ... [2021-08-26 09:01:14,001 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-26 09:01:14,007 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:14,054 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-08-26 09:01:14,061 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-08-26 09:01:14,105 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-26 09:01:14,106 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-26 09:01:14,106 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-08-26 09:01:14,106 INFO L130 BoogieDeclarations]: Found specification of procedure id [2021-08-26 09:01:14,106 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2021-08-26 09:01:14,107 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-08-26 09:01:14,287 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-26 09:01:14,288 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-08-26 09:01:14,289 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 09:01:14 BoogieIcfgContainer [2021-08-26 09:01:14,289 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-26 09:01:14,290 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-26 09:01:14,291 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-26 09:01:14,293 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-26 09:01:14,293 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 09:01:13" (1/3) ... [2021-08-26 09:01:14,294 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33017c66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 09:01:14, skipping insertion in model container [2021-08-26 09:01:14,294 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:13" (2/3) ... [2021-08-26 09:01:14,294 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33017c66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 09:01:14, skipping insertion in model container [2021-08-26 09:01:14,294 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 09:01:14" (3/3) ... [2021-08-26 09:01:14,295 INFO L111 eAbstractionObserver]: Analyzing ICFG id_o3.c [2021-08-26 09:01:14,299 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-26 09:01:14,300 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-08-26 09:01:14,340 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-08-26 09:01:14,346 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-08-26 09:01:14,346 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-08-26 09:01:14,360 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) [2021-08-26 09:01:14,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-08-26 09:01:14,364 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:14,365 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:14,365 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:14,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:14,370 INFO L82 PathProgramCache]: Analyzing trace with hash -358017204, now seen corresponding path program 1 times [2021-08-26 09:01:14,378 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:14,379 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1559183007] [2021-08-26 09:01:14,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:14,380 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:14,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:14,577 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:14,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:14,624 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 09:01:14,624 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:14,625 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1559183007] [2021-08-26 09:01:14,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1559183007] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 09:01:14,625 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 09:01:14,625 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-26 09:01:14,628 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1792541755] [2021-08-26 09:01:14,633 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-26 09:01:14,634 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:14,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-26 09:01:14,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-26 09:01:14,642 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) [2021-08-26 09:01:14,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:14,673 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2021-08-26 09:01:14,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-26 09:01:14,674 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 [2021-08-26 09:01:14,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:14,687 INFO L225 Difference]: With dead ends: 28 [2021-08-26 09:01:14,687 INFO L226 Difference]: Without dead ends: 15 [2021-08-26 09:01:14,689 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 29.0ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-26 09:01:14,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-08-26 09:01:14,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-08-26 09:01:14,709 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) [2021-08-26 09:01:14,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-08-26 09:01:14,711 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2021-08-26 09:01:14,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:14,711 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-08-26 09:01:14,711 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) [2021-08-26 09:01:14,711 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-08-26 09:01:14,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-08-26 09:01:14,712 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:14,712 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:14,712 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-26 09:01:14,712 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:14,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:14,713 INFO L82 PathProgramCache]: Analyzing trace with hash 679465686, now seen corresponding path program 1 times [2021-08-26 09:01:14,713 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:14,713 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1252611812] [2021-08-26 09:01:14,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:14,713 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:14,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:14,826 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:14,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:14,893 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:14,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:14,961 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-08-26 09:01:14,961 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:14,961 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1252611812] [2021-08-26 09:01:14,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1252611812] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:14,962 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1462235438] [2021-08-26 09:01:14,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:14,962 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:14,962 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:14,963 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) [2021-08-26 09:01:14,982 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-08-26 09:01:15,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:15,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 12 conjunts are in the unsatisfiable core [2021-08-26 09:01:15,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:15,316 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-08-26 09:01:15,316 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1462235438] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:15,317 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:15,317 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2021-08-26 09:01:15,318 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483452670] [2021-08-26 09:01:15,319 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-08-26 09:01:15,320 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:15,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-08-26 09:01:15,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-08-26 09:01:15,322 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 8 states, 8 states have (on average 1.625) internal successors, (13), 6 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-26 09:01:15,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:15,379 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2021-08-26 09:01:15,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-08-26 09:01:15,380 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 6 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 16 [2021-08-26 09:01:15,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:15,381 INFO L225 Difference]: With dead ends: 22 [2021-08-26 09:01:15,381 INFO L226 Difference]: Without dead ends: 18 [2021-08-26 09:01:15,381 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 136.5ms TimeCoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-08-26 09:01:15,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-08-26 09:01:15,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-08-26 09:01:15,384 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) [2021-08-26 09:01:15,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-08-26 09:01:15,384 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 16 [2021-08-26 09:01:15,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:15,384 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-08-26 09:01:15,384 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 6 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-26 09:01:15,385 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-08-26 09:01:15,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-08-26 09:01:15,385 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:15,385 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:15,421 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:15,586 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 [2021-08-26 09:01:15,586 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:15,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:15,586 INFO L82 PathProgramCache]: Analyzing trace with hash -41010676, now seen corresponding path program 2 times [2021-08-26 09:01:15,587 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:15,587 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [810516719] [2021-08-26 09:01:15,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:15,587 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:15,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:15,670 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:15,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:15,742 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:15,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:15,832 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:15,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:15,860 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-08-26 09:01:15,860 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:15,860 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [810516719] [2021-08-26 09:01:15,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [810516719] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:15,860 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2103802436] [2021-08-26 09:01:15,861 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-26 09:01:15,861 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:15,861 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:15,877 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) [2021-08-26 09:01:15,878 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-08-26 09:01:15,950 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-26 09:01:15,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:15,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 16 conjunts are in the unsatisfiable core [2021-08-26 09:01:15,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:16,154 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-08-26 09:01:16,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2103802436] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:16,154 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:16,155 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2021-08-26 09:01:16,155 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620609259] [2021-08-26 09:01:16,155 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-08-26 09:01:16,155 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:16,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-08-26 09:01:16,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-08-26 09:01:16,156 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 10 states, 10 states have (on average 1.5) internal successors, (15), 7 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-08-26 09:01:16,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:16,197 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2021-08-26 09:01:16,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-08-26 09:01:16,198 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.5) internal successors, (15), 7 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) Word has length 22 [2021-08-26 09:01:16,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:16,198 INFO L225 Difference]: With dead ends: 25 [2021-08-26 09:01:16,198 INFO L226 Difference]: Without dead ends: 21 [2021-08-26 09:01:16,199 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 114.0ms TimeCoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-08-26 09:01:16,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-08-26 09:01:16,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-08-26 09:01:16,201 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) [2021-08-26 09:01:16,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2021-08-26 09:01:16,201 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 22 [2021-08-26 09:01:16,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:16,202 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2021-08-26 09:01:16,202 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.5) internal successors, (15), 7 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-08-26 09:01:16,202 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2021-08-26 09:01:16,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-08-26 09:01:16,202 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:16,203 INFO L512 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:16,221 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-08-26 09:01:16,403 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 [2021-08-26 09:01:16,403 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:16,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:16,404 INFO L82 PathProgramCache]: Analyzing trace with hash 1769866774, now seen corresponding path program 3 times [2021-08-26 09:01:16,404 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:16,404 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [961444233] [2021-08-26 09:01:16,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:16,404 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:16,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-26 09:01:16,421 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-26 09:01:16,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-26 09:01:16,460 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-26 09:01:16,464 INFO L626 BasicCegarLoop]: Counterexample is feasible [2021-08-26 09:01:16,465 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-08-26 09:01:16,466 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-08-26 09:01:16,470 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-08-26 09:01:16,504 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 26.08 09:01:16 BoogieIcfgContainer [2021-08-26 09:01:16,505 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-26 09:01:16,505 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-08-26 09:01:16,505 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-08-26 09:01:16,505 INFO L275 PluginConnector]: Witness Printer initialized [2021-08-26 09:01:16,506 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 09:01:14" (3/4) ... [2021-08-26 09:01:16,508 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-08-26 09:01:16,557 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-08-26 09:01:16,557 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-08-26 09:01:16,558 INFO L168 Benchmark]: Toolchain (without parser) took 2788.33 ms. Allocated memory was 52.4 MB in the beginning and 75.5 MB in the end (delta: 23.1 MB). Free memory was 29.4 MB in the beginning and 55.4 MB in the end (delta: -26.0 MB). Peak memory consumption was 26.8 MB. Max. memory is 16.1 GB. [2021-08-26 09:01:16,558 INFO L168 Benchmark]: CDTParser took 0.15 ms. Allocated memory is still 52.4 MB. Free memory was 34.3 MB in the beginning and 34.3 MB in the end (delta: 38.1 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-26 09:01:16,562 INFO L168 Benchmark]: CACSL2BoogieTranslator took 149.94 ms. Allocated memory is still 52.4 MB. Free memory was 29.2 MB in the beginning and 35.6 MB in the end (delta: -6.4 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-08-26 09:01:16,562 INFO L168 Benchmark]: Boogie Procedure Inliner took 52.15 ms. Allocated memory was 52.4 MB in the beginning and 62.9 MB in the end (delta: 10.5 MB). Free memory was 35.6 MB in the beginning and 46.0 MB in the end (delta: -10.4 MB). Peak memory consumption was 4.1 MB. Max. memory is 16.1 GB. [2021-08-26 09:01:16,562 INFO L168 Benchmark]: Boogie Preprocessor took 18.91 ms. Allocated memory is still 62.9 MB. Free memory was 46.0 MB in the beginning and 45.2 MB in the end (delta: 790.7 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-26 09:01:16,562 INFO L168 Benchmark]: RCFGBuilder took 294.81 ms. Allocated memory is still 62.9 MB. Free memory was 45.0 MB in the beginning and 34.0 MB in the end (delta: 11.0 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-08-26 09:01:16,563 INFO L168 Benchmark]: TraceAbstraction took 2214.24 ms. Allocated memory was 62.9 MB in the beginning and 75.5 MB in the end (delta: 12.6 MB). Free memory was 33.4 MB in the beginning and 29.0 MB in the end (delta: 4.4 MB). Peak memory consumption was 17.2 MB. Max. memory is 16.1 GB. [2021-08-26 09:01:16,563 INFO L168 Benchmark]: Witness Printer took 51.79 ms. Allocated memory is still 75.5 MB. Free memory was 29.0 MB in the beginning and 55.4 MB in the end (delta: -26.4 MB). Peak memory consumption was 2.4 MB. Max. memory is 16.1 GB. [2021-08-26 09:01:16,564 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.15 ms. Allocated memory is still 52.4 MB. Free memory was 34.3 MB in the beginning and 34.3 MB in the end (delta: 38.1 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 149.94 ms. Allocated memory is still 52.4 MB. Free memory was 29.2 MB in the beginning and 35.6 MB in the end (delta: -6.4 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 52.15 ms. Allocated memory was 52.4 MB in the beginning and 62.9 MB in the end (delta: 10.5 MB). Free memory was 35.6 MB in the beginning and 46.0 MB in the end (delta: -10.4 MB). Peak memory consumption was 4.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 18.91 ms. Allocated memory is still 62.9 MB. Free memory was 46.0 MB in the beginning and 45.2 MB in the end (delta: 790.7 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 294.81 ms. Allocated memory is still 62.9 MB. Free memory was 45.0 MB in the beginning and 34.0 MB in the end (delta: 11.0 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 2214.24 ms. Allocated memory was 62.9 MB in the beginning and 75.5 MB in the end (delta: 12.6 MB). Free memory was 33.4 MB in the beginning and 29.0 MB in the end (delta: 4.4 MB). Peak memory consumption was 17.2 MB. Max. memory is 16.1 GB. * Witness Printer took 51.79 ms. Allocated memory is still 75.5 MB. Free memory was 29.0 MB in the beginning and 55.4 MB in the end (delta: -26.4 MB). Peak memory consumption was 2.4 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 15]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L12] unsigned int input = __VERIFIER_nondet_uint(); [L13] CALL, EXPR id(input) 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; [L13] RET, EXPR id(input) [L13] unsigned int result = id(input); [L14] COND TRUE result == 3 [L15] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 16 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 2131.0ms, OverallIterations: 4, TraceHistogramMax: 4, EmptinessCheckTime: 9.5ms, AutomataDifference: 159.4ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 10.1ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 45 SDtfs, 3 SDslu, 224 SDs, 0 SdLazy, 69 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 65.5ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 69 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 279.5ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=21occurred in iteration=3, InterpolantAutomatonStates: 21, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 18.4ms AutomataMinimizationTime, 3 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 28.2ms SsaConstructionTime, 135.3ms SatisfiabilityAnalysisTime, 1106.6ms InterpolantComputationTime, 114 NumberOfCodeBlocks, 114 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 81 ConstructedInterpolants, 0 QuantifiedInterpolants, 309 SizeOfPredicates, 2 NumberOfNonLiveVariables, 138 ConjunctsInSsa, 28 ConjunctsInUnsatCore, 5 InterpolantComputations, 1 PerfectInterpolantSequences, 18/36 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-08-26 09:01:16,592 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...