./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/id2_b3_o2.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/id2_b3_o2.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 22bfff7e0bc9ff374f4201c2281f2aec36cb181e ....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 09:00:25,908 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-26 09:00:25,911 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-26 09:00:25,963 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-08-26 09:00:25,963 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-08-26 09:00:25,967 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-08-26 09:00:25,968 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-08-26 09:00:25,974 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-08-26 09:00:25,976 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-08-26 09:00:25,980 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-08-26 09:00:25,982 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-08-26 09:00:25,986 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-08-26 09:00:25,986 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-08-26 09:00:25,989 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-08-26 09:00:25,990 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-08-26 09:00:25,993 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-08-26 09:00:25,994 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-08-26 09:00:25,995 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-08-26 09:00:25,997 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-08-26 09:00:26,003 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-08-26 09:00:26,004 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-08-26 09:00:26,006 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-08-26 09:00:26,008 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-08-26 09:00:26,008 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-08-26 09:00:26,015 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-08-26 09:00:26,015 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-08-26 09:00:26,015 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-08-26 09:00:26,017 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-08-26 09:00:26,018 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-08-26 09:00:26,018 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-08-26 09:00:26,019 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-08-26 09:00:26,019 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-08-26 09:00:26,021 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-08-26 09:00:26,021 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-08-26 09:00:26,023 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-08-26 09:00:26,023 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-08-26 09:00:26,024 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-08-26 09:00:26,024 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-08-26 09:00:26,024 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-08-26 09:00:26,025 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-08-26 09:00:26,026 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-08-26 09:00:26,030 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-08-26 09:00:26,065 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-26 09:00:26,066 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-26 09:00:26,067 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-08-26 09:00:26,067 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-08-26 09:00:26,069 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-26 09:00:26,069 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-26 09:00:26,069 INFO L138 SettingsManager]: * Use SBE=true [2021-08-26 09:00:26,070 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-26 09:00:26,070 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-26 09:00:26,070 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-26 09:00:26,071 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-26 09:00:26,071 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-26 09:00:26,071 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-08-26 09:00:26,071 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-26 09:00:26,072 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-08-26 09:00:26,072 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-26 09:00:26,072 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-08-26 09:00:26,072 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-26 09:00:26,072 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-08-26 09:00:26,073 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-26 09:00:26,073 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-26 09:00:26,073 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-26 09:00:26,073 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-26 09:00:26,074 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-26 09:00:26,074 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-26 09:00:26,074 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-08-26 09:00:26,074 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-26 09:00:26,074 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-26 09:00:26,075 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-08-26 09:00:26,075 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-08-26 09:00:26,075 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 22bfff7e0bc9ff374f4201c2281f2aec36cb181e [2021-08-26 09:00:26,390 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-26 09:00:26,416 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-26 09:00:26,419 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-26 09:00:26,420 INFO L271 PluginConnector]: Initializing CDTParser... [2021-08-26 09:00:26,421 INFO L275 PluginConnector]: CDTParser initialized [2021-08-26 09:00:26,422 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/id2_b3_o2.c [2021-08-26 09:00:26,475 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2d54895f7/7f19e3ec45a54bbd8676417cc281b06e/FLAG91a0a2b3e [2021-08-26 09:00:26,914 INFO L306 CDTParser]: Found 1 translation units. [2021-08-26 09:00:26,914 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id2_b3_o2.c [2021-08-26 09:00:26,920 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2d54895f7/7f19e3ec45a54bbd8676417cc281b06e/FLAG91a0a2b3e [2021-08-26 09:00:26,931 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2d54895f7/7f19e3ec45a54bbd8676417cc281b06e [2021-08-26 09:00:26,935 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-26 09:00:26,936 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-08-26 09:00:26,937 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-08-26 09:00:26,937 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-08-26 09:00:26,943 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-08-26 09:00:26,944 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 09:00:26" (1/1) ... [2021-08-26 09:00:26,945 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@473f2a4f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:26, skipping insertion in model container [2021-08-26 09:00:26,945 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 09:00:26" (1/1) ... [2021-08-26 09:00:26,950 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-08-26 09:00:26,962 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-08-26 09:00:27,057 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/id2_b3_o2.c[771,784] [2021-08-26 09:00:27,062 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-26 09:00:27,070 INFO L203 MainTranslator]: Completed pre-run [2021-08-26 09:00:27,092 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/id2_b3_o2.c[771,784] [2021-08-26 09:00:27,093 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-26 09:00:27,106 INFO L208 MainTranslator]: Completed translation [2021-08-26 09:00:27,106 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:27 WrapperNode [2021-08-26 09:00:27,128 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-08-26 09:00:27,130 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-08-26 09:00:27,130 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-08-26 09:00:27,130 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-08-26 09:00:27,142 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:27" (1/1) ... [2021-08-26 09:00:27,148 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:27" (1/1) ... [2021-08-26 09:00:27,161 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-08-26 09:00:27,162 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-26 09:00:27,162 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-26 09:00:27,162 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-26 09:00:27,168 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:27" (1/1) ... [2021-08-26 09:00:27,169 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:27" (1/1) ... [2021-08-26 09:00:27,180 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:27" (1/1) ... [2021-08-26 09:00:27,180 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:27" (1/1) ... [2021-08-26 09:00:27,185 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:27" (1/1) ... [2021-08-26 09:00:27,187 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:27" (1/1) ... [2021-08-26 09:00:27,192 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:27" (1/1) ... [2021-08-26 09:00:27,193 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-26 09:00:27,194 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-26 09:00:27,195 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-26 09:00:27,195 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-26 09:00:27,196 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:27" (1/1) ... [2021-08-26 09:00:27,202 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-26 09:00:27,209 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:00:27,222 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 09:00:27,252 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 09:00:27,263 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-08-26 09:00:27,266 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-08-26 09:00:27,267 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2021-08-26 09:00:27,267 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2021-08-26 09:00:27,267 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-26 09:00:27,268 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-26 09:00:27,268 INFO L130 BoogieDeclarations]: Found specification of procedure id [2021-08-26 09:00:27,268 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2021-08-26 09:00:27,533 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-26 09:00:27,533 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-08-26 09:00:27,534 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 09:00:27 BoogieIcfgContainer [2021-08-26 09:00:27,535 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-26 09:00:27,536 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-26 09:00:27,536 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-26 09:00:27,538 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-26 09:00:27,538 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 09:00:26" (1/3) ... [2021-08-26 09:00:27,539 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@267e5c81 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 09:00:27, skipping insertion in model container [2021-08-26 09:00:27,539 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:27" (2/3) ... [2021-08-26 09:00:27,539 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@267e5c81 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 09:00:27, skipping insertion in model container [2021-08-26 09:00:27,540 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 09:00:27" (3/3) ... [2021-08-26 09:00:27,541 INFO L111 eAbstractionObserver]: Analyzing ICFG id2_b3_o2.c [2021-08-26 09:00:27,545 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-26 09:00:27,545 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-08-26 09:00:27,605 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-08-26 09:00:27,614 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 09:00:27,615 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-08-26 09:00:27,631 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-08-26 09:00:27,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-08-26 09:00:27,641 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:00:27,641 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:00:27,642 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:00:27,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:00:27,651 INFO L82 PathProgramCache]: Analyzing trace with hash 794002500, now seen corresponding path program 1 times [2021-08-26 09:00:27,662 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:00:27,663 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478632495] [2021-08-26 09:00:27,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:00:27,664 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:00:27,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:27,866 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:27,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:27,913 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 09:00:27,913 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:00:27,914 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478632495] [2021-08-26 09:00:27,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [478632495] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 09:00:27,915 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 09:00:27,915 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-26 09:00:27,924 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956612062] [2021-08-26 09:00:27,930 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-26 09:00:27,930 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:00:27,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-26 09:00:27,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-26 09:00:27,945 INFO L87 Difference]: Start difference. First operand has 24 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) 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 09:00:28,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:00:28,003 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2021-08-26 09:00:28,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-26 09:00:28,005 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 09:00:28,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:00:28,012 INFO L225 Difference]: With dead ends: 36 [2021-08-26 09:00:28,012 INFO L226 Difference]: Without dead ends: 23 [2021-08-26 09:00:28,015 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 32.9ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-26 09:00:28,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-08-26 09:00:28,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-08-26 09:00:28,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 3 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-08-26 09:00:28,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2021-08-26 09:00:28,050 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 10 [2021-08-26 09:00:28,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:00:28,051 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2021-08-26 09:00:28,051 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 09:00:28,052 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2021-08-26 09:00:28,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-08-26 09:00:28,053 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:00:28,053 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:00:28,054 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-26 09:00:28,054 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:00:28,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:00:28,056 INFO L82 PathProgramCache]: Analyzing trace with hash 1040166181, now seen corresponding path program 1 times [2021-08-26 09:00:28,056 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:00:28,056 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1485086921] [2021-08-26 09:00:28,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:00:28,056 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:00:28,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:28,151 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:28,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:28,206 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:28,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:28,238 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 09:00:28,238 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:00:28,239 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1485086921] [2021-08-26 09:00:28,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1485086921] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 09:00:28,239 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 09:00:28,239 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-26 09:00:28,239 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390350012] [2021-08-26 09:00:28,241 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-26 09:00:28,244 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:00:28,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-26 09:00:28,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-26 09:00:28,245 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 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 09:00:28,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:00:28,270 INFO L93 Difference]: Finished difference Result 41 states and 49 transitions. [2021-08-26 09:00:28,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-26 09:00:28,271 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 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 17 [2021-08-26 09:00:28,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:00:28,272 INFO L225 Difference]: With dead ends: 41 [2021-08-26 09:00:28,273 INFO L226 Difference]: Without dead ends: 29 [2021-08-26 09:00:28,274 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 29.8ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-26 09:00:28,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-08-26 09:00:28,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2021-08-26 09:00:28,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 2 states have call predecessors, (3), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-08-26 09:00:28,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2021-08-26 09:00:28,285 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 17 [2021-08-26 09:00:28,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:00:28,285 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2021-08-26 09:00:28,286 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 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 09:00:28,286 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2021-08-26 09:00:28,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-08-26 09:00:28,287 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:00:28,288 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:00:28,288 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-08-26 09:00:28,289 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:00:28,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:00:28,290 INFO L82 PathProgramCache]: Analyzing trace with hash 1068795332, now seen corresponding path program 1 times [2021-08-26 09:00:28,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:00:28,292 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [447378244] [2021-08-26 09:00:28,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:00:28,294 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:00:28,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:28,363 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:28,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:28,420 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:28,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:28,453 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 09:00:28,453 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:00:28,453 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [447378244] [2021-08-26 09:00:28,454 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [447378244] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 09:00:28,454 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 09:00:28,454 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-08-26 09:00:28,454 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268303148] [2021-08-26 09:00:28,455 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-08-26 09:00:28,455 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:00:28,455 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-08-26 09:00:28,455 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-08-26 09:00:28,456 INFO L87 Difference]: Start difference. First operand 27 states and 31 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 09:00:28,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:00:28,499 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2021-08-26 09:00:28,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-08-26 09:00:28,500 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 17 [2021-08-26 09:00:28,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:00:28,501 INFO L225 Difference]: With dead ends: 33 [2021-08-26 09:00:28,501 INFO L226 Difference]: Without dead ends: 29 [2021-08-26 09:00:28,502 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 69.0ms TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-08-26 09:00:28,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-08-26 09:00:28,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2021-08-26 09:00:28,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 2 states have call predecessors, (3), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-08-26 09:00:28,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2021-08-26 09:00:28,506 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 17 [2021-08-26 09:00:28,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:00:28,506 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2021-08-26 09:00:28,506 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 09:00:28,507 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2021-08-26 09:00:28,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-08-26 09:00:28,507 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:00:28,508 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:00:28,508 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-08-26 09:00:28,508 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:00:28,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:00:28,524 INFO L82 PathProgramCache]: Analyzing trace with hash 1632008158, now seen corresponding path program 1 times [2021-08-26 09:00:28,525 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:00:28,525 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1675225710] [2021-08-26 09:00:28,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:00:28,525 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:00:28,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:28,575 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:28,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:28,614 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:28,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:28,696 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:28,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:28,717 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-08-26 09:00:28,717 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:00:28,717 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1675225710] [2021-08-26 09:00:28,718 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1675225710] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 09:00:28,718 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 09:00:28,718 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-26 09:00:28,718 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043139016] [2021-08-26 09:00:28,718 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-26 09:00:28,718 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:00:28,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-26 09:00:28,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-26 09:00:28,719 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-08-26 09:00:28,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:00:28,734 INFO L93 Difference]: Finished difference Result 45 states and 52 transitions. [2021-08-26 09:00:28,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-26 09:00:28,734 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 24 [2021-08-26 09:00:28,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:00:28,735 INFO L225 Difference]: With dead ends: 45 [2021-08-26 09:00:28,735 INFO L226 Difference]: Without dead ends: 33 [2021-08-26 09:00:28,738 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 19.2ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-26 09:00:28,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-08-26 09:00:28,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2021-08-26 09:00:28,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 23 states have internal predecessors, (26), 3 states have call successors, (3), 2 states have call predecessors, (3), 5 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) [2021-08-26 09:00:28,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2021-08-26 09:00:28,743 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 24 [2021-08-26 09:00:28,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:00:28,744 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2021-08-26 09:00:28,745 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-08-26 09:00:28,745 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2021-08-26 09:00:28,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-08-26 09:00:28,745 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:00:28,745 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:00:28,745 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-08-26 09:00:28,746 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:00:28,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:00:28,746 INFO L82 PathProgramCache]: Analyzing trace with hash 1435494653, now seen corresponding path program 1 times [2021-08-26 09:00:28,746 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:00:28,746 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1070570048] [2021-08-26 09:00:28,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:00:28,746 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:00:28,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:28,813 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:28,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:28,897 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:28,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:28,948 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:28,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:28,969 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-08-26 09:00:28,970 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:00:28,970 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1070570048] [2021-08-26 09:00:28,970 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1070570048] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 09:00:28,970 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 09:00:28,970 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-08-26 09:00:28,970 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462351213] [2021-08-26 09:00:28,971 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-08-26 09:00:28,971 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:00:28,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-08-26 09:00:28,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-08-26 09:00:28,972 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 6 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-08-26 09:00:29,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:00:29,021 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2021-08-26 09:00:29,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-08-26 09:00:29,022 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 6 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) Word has length 24 [2021-08-26 09:00:29,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:00:29,024 INFO L225 Difference]: With dead ends: 49 [2021-08-26 09:00:29,025 INFO L226 Difference]: Without dead ends: 37 [2021-08-26 09:00:29,025 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 55.5ms TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-08-26 09:00:29,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-08-26 09:00:29,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2021-08-26 09:00:29,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 25 states have (on average 1.16) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 2 states have call predecessors, (3), 6 states have return successors, (7), 6 states have call predecessors, (7), 3 states have call successors, (7) [2021-08-26 09:00:29,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2021-08-26 09:00:29,029 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 24 [2021-08-26 09:00:29,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:00:29,029 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2021-08-26 09:00:29,029 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 6 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-08-26 09:00:29,029 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2021-08-26 09:00:29,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-08-26 09:00:29,030 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:00:29,030 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:00:29,030 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-08-26 09:00:29,030 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:00:29,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:00:29,031 INFO L82 PathProgramCache]: Analyzing trace with hash 1464123804, now seen corresponding path program 1 times [2021-08-26 09:00:29,031 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:00:29,031 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [879894695] [2021-08-26 09:00:29,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:00:29,031 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:00:29,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-26 09:00:29,043 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-26 09:00:29,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-26 09:00:29,071 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-26 09:00:29,071 INFO L626 BasicCegarLoop]: Counterexample is feasible [2021-08-26 09:00:29,072 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-08-26 09:00:29,073 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-08-26 09:00:29,078 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-08-26 09:00:29,101 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 26.08 09:00:29 BoogieIcfgContainer [2021-08-26 09:00:29,101 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-26 09:00:29,102 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-08-26 09:00:29,102 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-08-26 09:00:29,102 INFO L275 PluginConnector]: Witness Printer initialized [2021-08-26 09:00:29,103 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 09:00:27" (3/4) ... [2021-08-26 09:00:29,104 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-08-26 09:00:29,147 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-08-26 09:00:29,147 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-08-26 09:00:29,148 INFO L168 Benchmark]: Toolchain (without parser) took 2211.15 ms. Allocated memory was 62.9 MB in the beginning and 92.3 MB in the end (delta: 29.4 MB). Free memory was 43.7 MB in the beginning and 73.7 MB in the end (delta: -29.9 MB). Peak memory consumption was 32.4 MB. Max. memory is 16.1 GB. [2021-08-26 09:00:29,149 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 62.9 MB. Free memory was 45.1 MB in the beginning and 45.0 MB in the end (delta: 84.0 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-26 09:00:29,149 INFO L168 Benchmark]: CACSL2BoogieTranslator took 191.96 ms. Allocated memory is still 62.9 MB. Free memory was 43.5 MB in the beginning and 47.6 MB in the end (delta: -4.0 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-08-26 09:00:29,150 INFO L168 Benchmark]: Boogie Procedure Inliner took 31.01 ms. Allocated memory is still 62.9 MB. Free memory was 47.6 MB in the beginning and 46.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-08-26 09:00:29,150 INFO L168 Benchmark]: Boogie Preprocessor took 31.90 ms. Allocated memory is still 62.9 MB. Free memory was 46.2 MB in the beginning and 45.3 MB in the end (delta: 847.4 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-26 09:00:29,150 INFO L168 Benchmark]: RCFGBuilder took 340.43 ms. Allocated memory is still 62.9 MB. Free memory was 45.3 MB in the beginning and 32.5 MB in the end (delta: 12.8 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2021-08-26 09:00:29,151 INFO L168 Benchmark]: TraceAbstraction took 1565.41 ms. Allocated memory was 62.9 MB in the beginning and 75.5 MB in the end (delta: 12.6 MB). Free memory was 32.1 MB in the beginning and 25.5 MB in the end (delta: 6.6 MB). Peak memory consumption was 21.1 MB. Max. memory is 16.1 GB. [2021-08-26 09:00:29,151 INFO L168 Benchmark]: Witness Printer took 45.20 ms. Allocated memory was 75.5 MB in the beginning and 92.3 MB in the end (delta: 16.8 MB). Free memory was 25.5 MB in the beginning and 73.7 MB in the end (delta: -48.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-08-26 09:00:29,154 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 62.9 MB. Free memory was 45.1 MB in the beginning and 45.0 MB in the end (delta: 84.0 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 191.96 ms. Allocated memory is still 62.9 MB. Free memory was 43.5 MB in the beginning and 47.6 MB in the end (delta: -4.0 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 31.01 ms. Allocated memory is still 62.9 MB. Free memory was 47.6 MB in the beginning and 46.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 31.90 ms. Allocated memory is still 62.9 MB. Free memory was 46.2 MB in the beginning and 45.3 MB in the end (delta: 847.4 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 340.43 ms. Allocated memory is still 62.9 MB. Free memory was 45.3 MB in the beginning and 32.5 MB in the end (delta: 12.8 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 1565.41 ms. Allocated memory was 62.9 MB in the beginning and 75.5 MB in the end (delta: 12.6 MB). Free memory was 32.1 MB in the beginning and 25.5 MB in the end (delta: 6.6 MB). Peak memory consumption was 21.1 MB. Max. memory is 16.1 GB. * Witness Printer took 45.20 ms. Allocated memory was 75.5 MB in the beginning and 92.3 MB in the end (delta: 16.8 MB). Free memory was 25.5 MB in the beginning and 73.7 MB in the end (delta: -48.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 27]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L24] unsigned int input = __VERIFIER_nondet_uint(); [L25] CALL, EXPR id(input) VAL [\old(x)=2] [L10] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=1] [L17] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L18] CALL, EXPR id(x-1) VAL [\old(x)=0] [L10] COND TRUE x==0 [L10] return 0; VAL [\old(x)=0, \result=0, x=0] [L18] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L18] unsigned int ret = id(x-1) + 1; [L19] COND FALSE !(ret > 3) [L20] return ret; VAL [\old(x)=1, \result=1, ret=1, x=1] [L11] RET, EXPR id2(x-1) VAL [\old(x)=2, id2(x-1)=1, x=2] [L11] unsigned int ret = id2(x-1) + 1; [L12] COND FALSE !(ret > 3) [L13] return ret; VAL [\old(x)=2, \result=2, ret=2, x=2] [L25] RET, EXPR id(input) [L25] unsigned int result = id(input); [L26] COND TRUE result == 2 [L27] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 1473.5ms, OverallIterations: 6, TraceHistogramMax: 2, EmptinessCheckTime: 18.4ms, AutomataDifference: 233.6ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 12.4ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 127 SDtfs, 13 SDslu, 492 SDs, 0 SdLazy, 99 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 85.7ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 59 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 206.5ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=35occurred in iteration=5, InterpolantAutomatonStates: 31, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 47.5ms AutomataMinimizationTime, 5 MinimizatonAttempts, 8 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 20.7ms SsaConstructionTime, 113.9ms SatisfiabilityAnalysisTime, 815.7ms InterpolantComputationTime, 116 NumberOfCodeBlocks, 116 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 87 ConstructedInterpolants, 0 QuantifiedInterpolants, 263 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 5 InterpolantComputations, 5 PerfectInterpolantSequences, 8/8 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 09:00:29,189 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...