./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5fbdf5bf Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/recursive-simple/id2_i5_o5-1.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 990c50250359c7452ab1ceec7da37e6f04bc6511 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.1-wip.dd.seqcomp-5fbdf5b [2021-08-29 16:32:14,048 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-29 16:32:14,051 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-29 16:32:14,095 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-08-29 16:32:14,095 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-08-29 16:32:14,099 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-08-29 16:32:14,100 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-08-29 16:32:14,105 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-08-29 16:32:14,107 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-08-29 16:32:14,113 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-08-29 16:32:14,114 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-08-29 16:32:14,118 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-08-29 16:32:14,118 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-08-29 16:32:14,120 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-08-29 16:32:14,121 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-08-29 16:32:14,121 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-08-29 16:32:14,122 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-08-29 16:32:14,123 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-08-29 16:32:14,124 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-08-29 16:32:14,125 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-08-29 16:32:14,127 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-08-29 16:32:14,130 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-08-29 16:32:14,134 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-08-29 16:32:14,135 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-08-29 16:32:14,151 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-08-29 16:32:14,151 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-08-29 16:32:14,152 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-08-29 16:32:14,153 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-08-29 16:32:14,154 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-08-29 16:32:14,154 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-08-29 16:32:14,154 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-08-29 16:32:14,155 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-08-29 16:32:14,156 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-08-29 16:32:14,157 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-08-29 16:32:14,158 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-08-29 16:32:14,158 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-08-29 16:32:14,159 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-08-29 16:32:14,159 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-08-29 16:32:14,159 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-08-29 16:32:14,160 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-08-29 16:32:14,161 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-08-29 16:32:14,165 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-08-29 16:32:14,188 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-29 16:32:14,188 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-29 16:32:14,189 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-08-29 16:32:14,189 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-08-29 16:32:14,191 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-29 16:32:14,191 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-29 16:32:14,191 INFO L138 SettingsManager]: * Use SBE=true [2021-08-29 16:32:14,192 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-29 16:32:14,192 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-29 16:32:14,192 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-29 16:32:14,193 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-29 16:32:14,193 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-29 16:32:14,193 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-08-29 16:32:14,193 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-29 16:32:14,193 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-08-29 16:32:14,193 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-29 16:32:14,194 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-08-29 16:32:14,194 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-29 16:32:14,194 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-08-29 16:32:14,194 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-29 16:32:14,194 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-29 16:32:14,194 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-29 16:32:14,194 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-29 16:32:14,195 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-29 16:32:14,195 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-29 16:32:14,195 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-08-29 16:32:14,195 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-29 16:32:14,195 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-29 16:32:14,196 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-08-29 16:32:14,196 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-08-29 16:32:14,196 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 990c50250359c7452ab1ceec7da37e6f04bc6511 [2021-08-29 16:32:14,498 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-29 16:32:14,529 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-29 16:32:14,532 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-29 16:32:14,533 INFO L271 PluginConnector]: Initializing CDTParser... [2021-08-29 16:32:14,534 INFO L275 PluginConnector]: CDTParser initialized [2021-08-29 16:32:14,535 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c [2021-08-29 16:32:14,589 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b03c626c3/eb5762b9e94845fbb68adc22eea3ba09/FLAG017c987fc [2021-08-29 16:32:15,035 INFO L306 CDTParser]: Found 1 translation units. [2021-08-29 16:32:15,036 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c [2021-08-29 16:32:15,040 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b03c626c3/eb5762b9e94845fbb68adc22eea3ba09/FLAG017c987fc [2021-08-29 16:32:15,055 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b03c626c3/eb5762b9e94845fbb68adc22eea3ba09 [2021-08-29 16:32:15,057 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-29 16:32:15,058 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-08-29 16:32:15,059 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-08-29 16:32:15,059 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-08-29 16:32:15,064 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-08-29 16:32:15,065 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.08 04:32:15" (1/1) ... [2021-08-29 16:32:15,066 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7aa06994 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:15, skipping insertion in model container [2021-08-29 16:32:15,066 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.08 04:32:15" (1/1) ... [2021-08-29 16:32:15,071 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-08-29 16:32:15,080 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-08-29 16:32:15,220 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_i5_o5-1.c[548,561] [2021-08-29 16:32:15,226 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-29 16:32:15,235 INFO L203 MainTranslator]: Completed pre-run [2021-08-29 16:32:15,250 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_i5_o5-1.c[548,561] [2021-08-29 16:32:15,251 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-29 16:32:15,285 INFO L208 MainTranslator]: Completed translation [2021-08-29 16:32:15,300 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:15 WrapperNode [2021-08-29 16:32:15,302 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-08-29 16:32:15,305 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-08-29 16:32:15,305 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-08-29 16:32:15,305 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-08-29 16:32:15,311 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:15" (1/1) ... [2021-08-29 16:32:15,317 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:15" (1/1) ... [2021-08-29 16:32:15,329 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-08-29 16:32:15,330 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-29 16:32:15,330 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-29 16:32:15,331 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-29 16:32:15,336 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:15" (1/1) ... [2021-08-29 16:32:15,337 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:15" (1/1) ... [2021-08-29 16:32:15,347 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:15" (1/1) ... [2021-08-29 16:32:15,348 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:15" (1/1) ... [2021-08-29 16:32:15,356 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:15" (1/1) ... [2021-08-29 16:32:15,358 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:15" (1/1) ... [2021-08-29 16:32:15,358 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:15" (1/1) ... [2021-08-29 16:32:15,359 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-29 16:32:15,360 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-29 16:32:15,360 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-29 16:32:15,360 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-29 16:32:15,361 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:15" (1/1) ... [2021-08-29 16:32:15,369 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-29 16:32:15,378 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:32:15,394 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-08-29 16:32:15,423 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-08-29 16:32:15,438 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-08-29 16:32:15,438 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-08-29 16:32:15,439 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2021-08-29 16:32:15,439 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2021-08-29 16:32:15,439 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-29 16:32:15,439 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-29 16:32:15,439 INFO L130 BoogieDeclarations]: Found specification of procedure id [2021-08-29 16:32:15,439 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2021-08-29 16:32:15,600 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-29 16:32:15,600 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-08-29 16:32:15,602 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.08 04:32:15 BoogieIcfgContainer [2021-08-29 16:32:15,602 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-29 16:32:15,604 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-29 16:32:15,604 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-29 16:32:15,607 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-29 16:32:15,607 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 29.08 04:32:15" (1/3) ... [2021-08-29 16:32:15,608 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37edc22e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.08 04:32:15, skipping insertion in model container [2021-08-29 16:32:15,608 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:15" (2/3) ... [2021-08-29 16:32:15,609 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37edc22e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.08 04:32:15, skipping insertion in model container [2021-08-29 16:32:15,609 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.08 04:32:15" (3/3) ... [2021-08-29 16:32:15,610 INFO L111 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-1.c [2021-08-29 16:32:15,615 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-29 16:32:15,616 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-08-29 16:32:15,666 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-08-29 16:32:15,676 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-08-29 16:32:15,677 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-08-29 16:32:15,692 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 16 states have internal predecessors, (19), 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) [2021-08-29 16:32:15,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-08-29 16:32:15,697 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:32:15,698 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:32:15,699 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:32:15,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:32:15,704 INFO L82 PathProgramCache]: Analyzing trace with hash -214835512, now seen corresponding path program 1 times [2021-08-29 16:32:15,711 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:32:15,711 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [520994864] [2021-08-29 16:32:15,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:15,712 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:32:15,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:15,915 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:15,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:15,955 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 16:32:15,957 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:32:15,957 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [520994864] [2021-08-29 16:32:15,958 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [520994864] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-29 16:32:15,969 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-29 16:32:15,970 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-29 16:32:15,971 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98707640] [2021-08-29 16:32:15,975 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-29 16:32:15,976 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:32:16,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-29 16:32:16,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-29 16:32:16,027 INFO L87 Difference]: Start difference. First operand has 22 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 16 states have internal predecessors, (19), 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) [2021-08-29 16:32:16,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:32:16,154 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2021-08-29 16:32:16,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-29 16:32:16,159 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-08-29 16:32:16,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:32:16,166 INFO L225 Difference]: With dead ends: 34 [2021-08-29 16:32:16,166 INFO L226 Difference]: Without dead ends: 21 [2021-08-29 16:32:16,169 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 42.85ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-29 16:32:16,174 INFO L928 BasicCegarLoop]: 6 mSDtfsCounter, 3 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 61.97ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.10ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 103.72ms IncrementalHoareTripleChecker+Time [2021-08-29 16:32:16,176 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 24 Invalid, 71 Unknown, 0 Unchecked, 2.10ms Time], IncrementalHoareTripleChecker [0 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 103.72ms Time] [2021-08-29 16:32:16,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-08-29 16:32:16,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-08-29 16:32:16,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 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) [2021-08-29 16:32:16,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2021-08-29 16:32:16,204 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 10 [2021-08-29 16:32:16,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:32:16,205 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2021-08-29 16:32:16,205 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-29 16:32:16,205 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2021-08-29 16:32:16,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-08-29 16:32:16,206 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:32:16,206 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:32:16,207 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-29 16:32:16,207 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:32:16,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:32:16,207 INFO L82 PathProgramCache]: Analyzing trace with hash 1901198062, now seen corresponding path program 1 times [2021-08-29 16:32:16,208 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:32:16,208 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [41605952] [2021-08-29 16:32:16,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:16,208 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:32:16,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:16,254 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:16,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:16,280 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:16,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:16,316 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 16:32:16,316 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:32:16,316 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [41605952] [2021-08-29 16:32:16,317 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [41605952] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-29 16:32:16,317 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-29 16:32:16,317 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-08-29 16:32:16,317 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555242874] [2021-08-29 16:32:16,318 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-08-29 16:32:16,318 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:32:16,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-08-29 16:32:16,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-08-29 16:32:16,319 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 7 states, 6 states have (on average 2.0) internal successors, (12), 7 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-08-29 16:32:16,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:32:16,407 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2021-08-29 16:32:16,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-08-29 16:32:16,407 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.0) internal successors, (12), 7 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 16 [2021-08-29 16:32:16,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:32:16,408 INFO L225 Difference]: With dead ends: 30 [2021-08-29 16:32:16,408 INFO L226 Difference]: Without dead ends: 26 [2021-08-29 16:32:16,409 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 32.07ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-08-29 16:32:16,410 INFO L928 BasicCegarLoop]: 3 mSDtfsCounter, 13 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 53.05ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.66ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 64.31ms IncrementalHoareTripleChecker+Time [2021-08-29 16:32:16,411 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 12 Invalid, 96 Unknown, 0 Unchecked, 1.66ms Time], IncrementalHoareTripleChecker [1 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 64.31ms Time] [2021-08-29 16:32:16,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-08-29 16:32:16,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2021-08-29 16:32:16,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.125) internal successors, (18), 17 states have internal predecessors, (18), 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) [2021-08-29 16:32:16,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2021-08-29 16:32:16,417 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 16 [2021-08-29 16:32:16,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:32:16,417 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2021-08-29 16:32:16,417 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.0) internal successors, (12), 7 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-08-29 16:32:16,417 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2021-08-29 16:32:16,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-08-29 16:32:16,418 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:32:16,418 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:32:16,418 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-08-29 16:32:16,419 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:32:16,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:32:16,419 INFO L82 PathProgramCache]: Analyzing trace with hash 1593669520, now seen corresponding path program 1 times [2021-08-29 16:32:16,419 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:32:16,420 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [963446982] [2021-08-29 16:32:16,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:16,420 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:32:16,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:16,465 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:16,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:16,517 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:16,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:16,557 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:16,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:16,597 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-08-29 16:32:16,597 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:32:16,598 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [963446982] [2021-08-29 16:32:16,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [963446982] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:32:16,598 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2070824761] [2021-08-29 16:32:16,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:16,598 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:16,599 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:32:16,600 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:32:16,605 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-08-29 16:32:16,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:16,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 8 conjunts are in the unsatisfiable core [2021-08-29 16:32:16,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:32:16,839 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-08-29 16:32:16,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:32:17,206 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-29 16:32:17,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2070824761] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:32:17,207 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:32:17,207 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 15 [2021-08-29 16:32:17,208 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759110338] [2021-08-29 16:32:17,210 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-08-29 16:32:17,212 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:32:17,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-08-29 16:32:17,214 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-08-29 16:32:17,214 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 15 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 15 states have internal predecessors, (28), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 3 states have call predecessors, (8), 8 states have call successors, (8) [2021-08-29 16:32:17,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:32:17,326 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2021-08-29 16:32:17,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-08-29 16:32:17,327 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 15 states have internal predecessors, (28), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 3 states have call predecessors, (8), 8 states have call successors, (8) Word has length 22 [2021-08-29 16:32:17,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:32:17,330 INFO L225 Difference]: With dead ends: 36 [2021-08-29 16:32:17,330 INFO L226 Difference]: Without dead ends: 32 [2021-08-29 16:32:17,331 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 114.45ms TimeCoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2021-08-29 16:32:17,333 INFO L928 BasicCegarLoop]: 3 mSDtfsCounter, 25 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 57.09ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.95ms SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 72.50ms IncrementalHoareTripleChecker+Time [2021-08-29 16:32:17,336 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 18 Invalid, 148 Unknown, 0 Unchecked, 5.95ms Time], IncrementalHoareTripleChecker [7 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 72.50ms Time] [2021-08-29 16:32:17,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-08-29 16:32:17,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 27. [2021-08-29 16:32:17,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 19 states have internal predecessors, (20), 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) [2021-08-29 16:32:17,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2021-08-29 16:32:17,347 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 22 [2021-08-29 16:32:17,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:32:17,348 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2021-08-29 16:32:17,348 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 15 states have internal predecessors, (28), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 3 states have call predecessors, (8), 8 states have call successors, (8) [2021-08-29 16:32:17,348 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2021-08-29 16:32:17,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-08-29 16:32:17,349 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:32:17,349 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:32:17,376 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-08-29 16:32:17,564 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:17,565 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:32:17,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:32:17,566 INFO L82 PathProgramCache]: Analyzing trace with hash 545848374, now seen corresponding path program 1 times [2021-08-29 16:32:17,566 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:32:17,566 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [389312858] [2021-08-29 16:32:17,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:17,566 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:32:17,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:17,598 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:17,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:17,632 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:17,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:17,662 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:17,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:17,678 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:17,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:17,691 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-08-29 16:32:17,691 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:32:17,692 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [389312858] [2021-08-29 16:32:17,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [389312858] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:32:17,692 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1311518235] [2021-08-29 16:32:17,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:17,692 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:17,700 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:32:17,711 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:32:17,712 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-08-29 16:32:17,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:17,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 10 conjunts are in the unsatisfiable core [2021-08-29 16:32:17,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:32:17,861 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-08-29 16:32:17,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:32:18,320 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-08-29 16:32:18,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1311518235] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:32:18,320 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:32:18,321 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 11] total 17 [2021-08-29 16:32:18,321 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144540222] [2021-08-29 16:32:18,321 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-08-29 16:32:18,322 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:32:18,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-08-29 16:32:18,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-08-29 16:32:18,322 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand has 17 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 17 states have internal predecessors, (32), 9 states have call successors, (9), 1 states have call predecessors, (9), 5 states have return successors, (11), 4 states have call predecessors, (11), 9 states have call successors, (11) [2021-08-29 16:32:18,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:32:18,446 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2021-08-29 16:32:18,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-08-29 16:32:18,447 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 17 states have internal predecessors, (32), 9 states have call successors, (9), 1 states have call predecessors, (9), 5 states have return successors, (11), 4 states have call predecessors, (11), 9 states have call successors, (11) Word has length 28 [2021-08-29 16:32:18,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:32:18,448 INFO L225 Difference]: With dead ends: 42 [2021-08-29 16:32:18,448 INFO L226 Difference]: Without dead ends: 38 [2021-08-29 16:32:18,449 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 118.95ms TimeCoverageRelationStatistics Valid=87, Invalid=333, Unknown=0, NotChecked=0, Total=420 [2021-08-29 16:32:18,449 INFO L928 BasicCegarLoop]: 3 mSDtfsCounter, 34 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 59.94ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.46ms SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 88.15ms IncrementalHoareTripleChecker+Time [2021-08-29 16:32:18,450 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 18 Invalid, 153 Unknown, 0 Unchecked, 1.46ms Time], IncrementalHoareTripleChecker [9 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 88.15ms Time] [2021-08-29 16:32:18,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-08-29 16:32:18,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 30. [2021-08-29 16:32:18,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.1) internal successors, (22), 21 states have internal predecessors, (22), 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) [2021-08-29 16:32:18,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2021-08-29 16:32:18,455 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 28 [2021-08-29 16:32:18,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:32:18,455 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2021-08-29 16:32:18,455 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 17 states have internal predecessors, (32), 9 states have call successors, (9), 1 states have call predecessors, (9), 5 states have return successors, (11), 4 states have call predecessors, (11), 9 states have call successors, (11) [2021-08-29 16:32:18,455 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2021-08-29 16:32:18,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-08-29 16:32:18,456 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:32:18,456 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:32:18,475 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-08-29 16:32:18,668 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,SelfDestructingSolverStorable3 [2021-08-29 16:32:18,669 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:32:18,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:32:18,669 INFO L82 PathProgramCache]: Analyzing trace with hash 120771672, now seen corresponding path program 2 times [2021-08-29 16:32:18,670 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:32:18,670 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [144965458] [2021-08-29 16:32:18,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:18,670 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:32:18,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:18,699 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:18,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:18,745 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:18,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:18,780 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:18,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:18,802 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:18,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:18,815 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:18,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:18,828 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-08-29 16:32:18,829 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:32:18,829 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [144965458] [2021-08-29 16:32:18,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [144965458] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:32:18,829 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1536251432] [2021-08-29 16:32:18,829 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-29 16:32:18,829 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:18,830 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:32:18,830 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:32:18,840 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-08-29 16:32:18,878 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-29 16:32:18,879 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-29 16:32:18,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 12 conjunts are in the unsatisfiable core [2021-08-29 16:32:18,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:32:18,986 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-08-29 16:32:18,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:32:19,617 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-08-29 16:32:19,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1536251432] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:32:19,617 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:32:19,617 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13] total 18 [2021-08-29 16:32:19,618 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1734984599] [2021-08-29 16:32:19,618 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-08-29 16:32:19,618 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:32:19,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-08-29 16:32:19,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2021-08-29 16:32:19,619 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 18 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 18 states have internal predecessors, (35), 9 states have call successors, (9), 1 states have call predecessors, (9), 6 states have return successors, (13), 5 states have call predecessors, (13), 9 states have call successors, (13) [2021-08-29 16:32:19,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:32:19,755 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-08-29 16:32:19,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-08-29 16:32:19,756 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 18 states have internal predecessors, (35), 9 states have call successors, (9), 1 states have call predecessors, (9), 6 states have return successors, (13), 5 states have call predecessors, (13), 9 states have call successors, (13) Word has length 34 [2021-08-29 16:32:19,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:32:19,758 INFO L225 Difference]: With dead ends: 48 [2021-08-29 16:32:19,758 INFO L226 Difference]: Without dead ends: 44 [2021-08-29 16:32:19,760 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 141.28ms TimeCoverageRelationStatistics Valid=111, Invalid=395, Unknown=0, NotChecked=0, Total=506 [2021-08-29 16:32:19,761 INFO L928 BasicCegarLoop]: 3 mSDtfsCounter, 62 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 61.41ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.83ms SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 87.83ms IncrementalHoareTripleChecker+Time [2021-08-29 16:32:19,761 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 15 Invalid, 161 Unknown, 0 Unchecked, 1.83ms Time], IncrementalHoareTripleChecker [23 Valid, 138 Invalid, 0 Unknown, 0 Unchecked, 87.83ms Time] [2021-08-29 16:32:19,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-08-29 16:32:19,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 33. [2021-08-29 16:32:19,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 23 states have internal predecessors, (24), 3 states have call successors, (3), 2 states have call predecessors, (3), 7 states have return successors, (8), 7 states have call predecessors, (8), 3 states have call successors, (8) [2021-08-29 16:32:19,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2021-08-29 16:32:19,766 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 34 [2021-08-29 16:32:19,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:32:19,767 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2021-08-29 16:32:19,767 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 18 states have internal predecessors, (35), 9 states have call successors, (9), 1 states have call predecessors, (9), 6 states have return successors, (13), 5 states have call predecessors, (13), 9 states have call successors, (13) [2021-08-29 16:32:19,767 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2021-08-29 16:32:19,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-08-29 16:32:19,768 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:32:19,768 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:32:19,788 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-08-29 16:32:19,980 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:19,981 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:32:19,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:32:19,982 INFO L82 PathProgramCache]: Analyzing trace with hash -644488834, now seen corresponding path program 2 times [2021-08-29 16:32:19,982 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:32:19,982 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1892433325] [2021-08-29 16:32:19,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:19,982 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:32:20,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-29 16:32:20,023 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-29 16:32:20,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-29 16:32:20,067 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-29 16:32:20,067 INFO L627 BasicCegarLoop]: Counterexample is feasible [2021-08-29 16:32:20,068 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-08-29 16:32:20,070 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-08-29 16:32:20,075 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-08-29 16:32:20,124 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 29.08 04:32:20 BoogieIcfgContainer [2021-08-29 16:32:20,125 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-29 16:32:20,126 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-08-29 16:32:20,126 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-08-29 16:32:20,126 INFO L275 PluginConnector]: Witness Printer initialized [2021-08-29 16:32:20,127 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.08 04:32:15" (3/4) ... [2021-08-29 16:32:20,128 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-08-29 16:32:20,199 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-08-29 16:32:20,200 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-08-29 16:32:20,200 INFO L158 Benchmark]: Toolchain (without parser) took 5142.58ms. Allocated memory was 67.1MB in the beginning and 98.6MB in the end (delta: 31.5MB). Free memory was 47.7MB in the beginning and 72.0MB in the end (delta: -24.3MB). Peak memory consumption was 5.6MB. Max. memory is 16.1GB. [2021-08-29 16:32:20,201 INFO L158 Benchmark]: CDTParser took 0.22ms. Allocated memory is still 67.1MB. Free memory was 47.8MB in the beginning and 47.8MB in the end (delta: 83.9kB). There was no memory consumed. Max. memory is 16.1GB. [2021-08-29 16:32:20,201 INFO L158 Benchmark]: CACSL2BoogieTranslator took 244.14ms. Allocated memory is still 67.1MB. Free memory was 47.5MB in the beginning and 50.9MB in the end (delta: -3.4MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-08-29 16:32:20,201 INFO L158 Benchmark]: Boogie Procedure Inliner took 24.62ms. Allocated memory is still 67.1MB. Free memory was 50.9MB in the beginning and 49.4MB in the end (delta: 1.5MB). There was no memory consumed. Max. memory is 16.1GB. [2021-08-29 16:32:20,201 INFO L158 Benchmark]: Boogie Preprocessor took 28.98ms. Allocated memory is still 67.1MB. Free memory was 49.4MB in the beginning and 48.6MB in the end (delta: 757.2kB). There was no memory consumed. Max. memory is 16.1GB. [2021-08-29 16:32:20,202 INFO L158 Benchmark]: RCFGBuilder took 242.09ms. Allocated memory is still 67.1MB. Free memory was 48.4MB in the beginning and 40.2MB in the end (delta: 8.2MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-08-29 16:32:20,202 INFO L158 Benchmark]: TraceAbstraction took 4521.87ms. Allocated memory was 67.1MB in the beginning and 98.6MB in the end (delta: 31.5MB). Free memory was 39.7MB in the beginning and 74.3MB in the end (delta: -34.6MB). There was no memory consumed. Max. memory is 16.1GB. [2021-08-29 16:32:20,202 INFO L158 Benchmark]: Witness Printer took 73.79ms. Allocated memory is still 98.6MB. Free memory was 74.3MB in the beginning and 72.0MB in the end (delta: 2.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-08-29 16:32:20,205 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22ms. Allocated memory is still 67.1MB. Free memory was 47.8MB in the beginning and 47.8MB in the end (delta: 83.9kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 244.14ms. Allocated memory is still 67.1MB. Free memory was 47.5MB in the beginning and 50.9MB in the end (delta: -3.4MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 24.62ms. Allocated memory is still 67.1MB. Free memory was 50.9MB in the beginning and 49.4MB in the end (delta: 1.5MB). There was no memory consumed. Max. memory is 16.1GB. * Boogie Preprocessor took 28.98ms. Allocated memory is still 67.1MB. Free memory was 49.4MB in the beginning and 48.6MB in the end (delta: 757.2kB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 242.09ms. Allocated memory is still 67.1MB. Free memory was 48.4MB in the beginning and 40.2MB in the end (delta: 8.2MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * TraceAbstraction took 4521.87ms. Allocated memory was 67.1MB in the beginning and 98.6MB in the end (delta: 31.5MB). Free memory was 39.7MB in the beginning and 74.3MB in the end (delta: -34.6MB). There was no memory consumed. Max. memory is 16.1GB. * Witness Printer took 73.79ms. Allocated memory is still 98.6MB. Free memory was 74.3MB in the beginning and 72.0MB in the end (delta: 2.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.00ms ErrorAutomatonConstructionTimeTotal, 0.00ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.00ms ErrorAutomatonConstructionTimeAvg, 0.00ms ErrorAutomatonDifferenceTimeAvg, 0.00ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 23]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L20] int input = 5; [L21] CALL, EXPR id(input) VAL [\old(x)=5] [L10] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=4] [L15] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L16] CALL, EXPR id(x-1) VAL [\old(x)=3] [L10] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=2] [L15] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L16] CALL, EXPR id(x-1) VAL [\old(x)=1] [L10] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=0] [L15] COND TRUE x==0 [L15] return 0; VAL [\old(x)=0, \result=0, x=0] [L11] RET, EXPR id2(x-1) VAL [\old(x)=1, id2(x-1)=0, x=1] [L11] return id2(x-1) + 1; [L16] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L16] return id(x-1) + 1; [L11] RET, EXPR id2(x-1) VAL [\old(x)=3, id2(x-1)=2, x=3] [L11] return id2(x-1) + 1; [L16] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L16] return id(x-1) + 1; [L11] RET, EXPR id2(x-1) VAL [\old(x)=5, id2(x-1)=4, x=5] [L11] return id2(x-1) + 1; [L21] RET, EXPR id(input) [L21] int result = id(input); [L22] COND TRUE result == 5 [L23] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 22 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 4409.72ms, OverallIterations: 6, TraceHistogramMax: 3, EmptinessCheckTime: 12.56ms, AutomataDifference: 694.36ms, DeadEndRemovalTime: 0.00ms, HoareAnnotationTime: 0.00ms, InitialAbstractionConstructionTime: 11.94ms, PartialOrderReductionTime: 0.00ms, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 163 SdHoareTripleChecker+Valid, 416.51ms IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 137 mSDsluCounter, 87 SdHoareTripleChecker+Invalid, 293.47ms Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 363 mSDsCounter, 40 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 589 IncrementalHoareTripleChecker+Invalid, 629 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 40 mSolverCounterUnsat, 18 mSDtfsCounter, 589 mSolverCounterSat, 13.01ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 237 GetRequests, 169 SyntacticMatches, 2 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 449.61ms Time, 0.00ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=33occurred in iteration=5, InterpolantAutomatonStates: 39, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.00ms DumpTime, AutomataMinimizationStatistics: 41.83ms AutomataMinimizationTime, 5 MinimizatonAttempts, 26 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 26.94ms SsaConstructionTime, 164.50ms SatisfiabilityAnalysisTime, 2528.32ms InterpolantComputationTime, 234 NumberOfCodeBlocks, 234 NumberOfCodeBlocksAsserted, 10 NumberOfCheckSat, 267 ConstructedInterpolants, 0 QuantifiedInterpolants, 719 SizeOfPredicates, 12 NumberOfNonLiveVariables, 285 ConjunctsInSsa, 30 ConjunctsInUnsatCore, 11 InterpolantComputations, 2 PerfectInterpolantSequences, 41/102 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-08-29 16:32:20,251 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...