./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 35987657 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/fibo_2calls_4-2.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 22d9a6832a4080412e38f5d573b63985f3b10b3c2009b6559595c7c0bbda414f --- Real Ultimate output --- This is Ultimate 0.2.2-?-3598765 [2022-07-21 05:07:27,154 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-21 05:07:27,156 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-21 05:07:27,183 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-21 05:07:27,183 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-21 05:07:27,184 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-21 05:07:27,189 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-21 05:07:27,193 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-21 05:07:27,202 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-21 05:07:27,203 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-21 05:07:27,204 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-21 05:07:27,207 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-21 05:07:27,208 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-21 05:07:27,213 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-21 05:07:27,214 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-21 05:07:27,216 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-21 05:07:27,217 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-21 05:07:27,218 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-21 05:07:27,220 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-21 05:07:27,224 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-21 05:07:27,229 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-21 05:07:27,229 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-21 05:07:27,234 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-21 05:07:27,234 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-21 05:07:27,235 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-21 05:07:27,237 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-21 05:07:27,239 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-21 05:07:27,239 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-21 05:07:27,240 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-21 05:07:27,240 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-21 05:07:27,241 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-21 05:07:27,241 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-21 05:07:27,242 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-21 05:07:27,243 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-21 05:07:27,244 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-21 05:07:27,246 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-21 05:07:27,246 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-21 05:07:27,246 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-21 05:07:27,247 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-21 05:07:27,247 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-21 05:07:27,248 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-21 05:07:27,249 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-21 05:07:27,249 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2022-07-21 05:07:27,283 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-21 05:07:27,284 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-21 05:07:27,284 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-21 05:07:27,285 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-21 05:07:27,285 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-21 05:07:27,285 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-21 05:07:27,286 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-21 05:07:27,286 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-21 05:07:27,286 INFO L138 SettingsManager]: * Use SBE=true [2022-07-21 05:07:27,287 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-21 05:07:27,288 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-21 05:07:27,288 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-21 05:07:27,288 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-21 05:07:27,288 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-21 05:07:27,288 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-07-21 05:07:27,288 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-21 05:07:27,289 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-07-21 05:07:27,289 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-21 05:07:27,289 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-07-21 05:07:27,289 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-21 05:07:27,289 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-07-21 05:07:27,290 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-21 05:07:27,290 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-21 05:07:27,290 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-21 05:07:27,290 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-21 05:07:27,290 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-21 05:07:27,290 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-21 05:07:27,291 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-07-21 05:07:27,291 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-07-21 05:07:27,291 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-07-21 05:07:27,291 INFO L138 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2022-07-21 05:07:27,292 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-07-21 05:07:27,292 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-07-21 05:07:27,292 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 22d9a6832a4080412e38f5d573b63985f3b10b3c2009b6559595c7c0bbda414f [2022-07-21 05:07:27,620 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-21 05:07:27,641 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-21 05:07:27,643 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-21 05:07:27,644 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-21 05:07:27,645 INFO L275 PluginConnector]: CDTParser initialized [2022-07-21 05:07:27,646 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c [2022-07-21 05:07:27,701 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e4e1ee5bd/99c958a4d7b54bb395c34550ca02682d/FLAGe6c94a5f5 [2022-07-21 05:07:28,103 INFO L306 CDTParser]: Found 1 translation units. [2022-07-21 05:07:28,104 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c [2022-07-21 05:07:28,109 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e4e1ee5bd/99c958a4d7b54bb395c34550ca02682d/FLAGe6c94a5f5 [2022-07-21 05:07:28,518 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e4e1ee5bd/99c958a4d7b54bb395c34550ca02682d [2022-07-21 05:07:28,521 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-21 05:07:28,523 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-21 05:07:28,524 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-21 05:07:28,524 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-21 05:07:28,527 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-21 05:07:28,527 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 05:07:28" (1/1) ... [2022-07-21 05:07:28,528 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@254e3849 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:07:28, skipping insertion in model container [2022-07-21 05:07:28,528 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 05:07:28" (1/1) ... [2022-07-21 05:07:28,534 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-21 05:07:28,546 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-21 05:07:28,660 WARN L230 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/fibo_2calls_4-2.c[946,959] [2022-07-21 05:07:28,663 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-21 05:07:28,669 INFO L203 MainTranslator]: Completed pre-run [2022-07-21 05:07:28,682 WARN L230 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/fibo_2calls_4-2.c[946,959] [2022-07-21 05:07:28,684 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-21 05:07:28,696 INFO L208 MainTranslator]: Completed translation [2022-07-21 05:07:28,697 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:07:28 WrapperNode [2022-07-21 05:07:28,697 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-21 05:07:28,698 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-07-21 05:07:28,698 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-07-21 05:07:28,699 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-07-21 05:07:28,704 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:07:28" (1/1) ... [2022-07-21 05:07:28,731 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:07:28" (1/1) ... [2022-07-21 05:07:28,761 INFO L137 Inliner]: procedures = 14, calls = 12, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 21 [2022-07-21 05:07:28,761 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-07-21 05:07:28,763 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-07-21 05:07:28,763 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-07-21 05:07:28,763 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-07-21 05:07:28,769 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:07:28" (1/1) ... [2022-07-21 05:07:28,769 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:07:28" (1/1) ... [2022-07-21 05:07:28,777 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:07:28" (1/1) ... [2022-07-21 05:07:28,778 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:07:28" (1/1) ... [2022-07-21 05:07:28,787 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:07:28" (1/1) ... [2022-07-21 05:07:28,788 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:07:28" (1/1) ... [2022-07-21 05:07:28,790 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:07:28" (1/1) ... [2022-07-21 05:07:28,793 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-07-21 05:07:28,795 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-07-21 05:07:28,795 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-07-21 05:07:28,796 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-07-21 05:07:28,796 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:07:28" (1/1) ... [2022-07-21 05:07:28,802 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-21 05:07:28,812 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 05:07:28,829 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) [2022-07-21 05:07:28,855 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 [2022-07-21 05:07:28,868 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-07-21 05:07:28,868 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-07-21 05:07:28,868 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2022-07-21 05:07:28,868 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2022-07-21 05:07:28,869 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2022-07-21 05:07:28,869 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2022-07-21 05:07:28,869 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-07-21 05:07:28,869 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-07-21 05:07:28,922 INFO L234 CfgBuilder]: Building ICFG [2022-07-21 05:07:28,924 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-07-21 05:07:29,065 INFO L275 CfgBuilder]: Performing block encoding [2022-07-21 05:07:29,070 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-07-21 05:07:29,070 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2022-07-21 05:07:29,072 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 05:07:29 BoogieIcfgContainer [2022-07-21 05:07:29,095 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-07-21 05:07:29,097 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-07-21 05:07:29,097 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-07-21 05:07:29,100 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-07-21 05:07:29,115 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 05:07:28" (1/3) ... [2022-07-21 05:07:29,116 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a3abee2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 05:07:29, skipping insertion in model container [2022-07-21 05:07:29,116 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:07:28" (2/3) ... [2022-07-21 05:07:29,117 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a3abee2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 05:07:29, skipping insertion in model container [2022-07-21 05:07:29,117 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 05:07:29" (3/3) ... [2022-07-21 05:07:29,118 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_4-2.c [2022-07-21 05:07:29,130 INFO L201 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-07-21 05:07:29,143 INFO L160 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-07-21 05:07:29,202 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-21 05:07:29,211 INFO L357 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, mAutomataTypeConcurrency=PETRI_NET, 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, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@abb0ee1, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@53018222 [2022-07-21 05:07:29,211 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-07-21 05:07:29,216 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 20 states have (on average 1.3) internal successors, (26), 21 states have internal predecessors, (26), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-07-21 05:07:29,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-07-21 05:07:29,238 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 05:07:29,239 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 05:07:29,240 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 05:07:29,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 05:07:29,247 INFO L85 PathProgramCache]: Analyzing trace with hash 1123300790, now seen corresponding path program 1 times [2022-07-21 05:07:29,254 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 05:07:29,255 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1179870556] [2022-07-21 05:07:29,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 05:07:29,256 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 05:07:29,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:29,421 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-07-21 05:07:29,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:29,465 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 05:07:29,466 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 05:07:29,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1179870556] [2022-07-21 05:07:29,467 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1179870556] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 05:07:29,467 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 05:07:29,467 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-21 05:07:29,468 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553910435] [2022-07-21 05:07:29,470 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 05:07:29,473 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-21 05:07:29,473 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 05:07:29,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-21 05:07:29,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-07-21 05:07:29,507 INFO L87 Difference]: Start difference. First operand has 29 states, 20 states have (on average 1.3) internal successors, (26), 21 states have internal predecessors, (26), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) 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) [2022-07-21 05:07:29,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 05:07:29,565 INFO L93 Difference]: Finished difference Result 43 states and 51 transitions. [2022-07-21 05:07:29,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-21 05:07:29,568 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 [2022-07-21 05:07:29,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 05:07:29,579 INFO L225 Difference]: With dead ends: 43 [2022-07-21 05:07:29,579 INFO L226 Difference]: Without dead ends: 27 [2022-07-21 05:07:29,582 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-07-21 05:07:29,585 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 4 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-21 05:07:29,586 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 123 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-21 05:07:29,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-07-21 05:07:29,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-07-21 05:07:29,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-07-21 05:07:29,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2022-07-21 05:07:29,623 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 10 [2022-07-21 05:07:29,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 05:07:29,624 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2022-07-21 05:07:29,624 INFO L496 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) [2022-07-21 05:07:29,624 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2022-07-21 05:07:29,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-07-21 05:07:29,626 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 05:07:29,626 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 05:07:29,626 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-07-21 05:07:29,626 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 05:07:29,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 05:07:29,627 INFO L85 PathProgramCache]: Analyzing trace with hash 1177745932, now seen corresponding path program 1 times [2022-07-21 05:07:29,627 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 05:07:29,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [980780477] [2022-07-21 05:07:29,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 05:07:29,628 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 05:07:29,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:29,654 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-07-21 05:07:29,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:29,674 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 05:07:29,674 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 05:07:29,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [980780477] [2022-07-21 05:07:29,675 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [980780477] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 05:07:29,675 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 05:07:29,675 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-21 05:07:29,675 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481941387] [2022-07-21 05:07:29,675 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 05:07:29,676 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-21 05:07:29,677 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 05:07:29,677 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-21 05:07:29,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-07-21 05:07:29,678 INFO L87 Difference]: Start difference. First operand 27 states and 34 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 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) [2022-07-21 05:07:29,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 05:07:29,696 INFO L93 Difference]: Finished difference Result 33 states and 41 transitions. [2022-07-21 05:07:29,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-21 05:07:29,697 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 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 11 [2022-07-21 05:07:29,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 05:07:29,698 INFO L225 Difference]: With dead ends: 33 [2022-07-21 05:07:29,698 INFO L226 Difference]: Without dead ends: 29 [2022-07-21 05:07:29,699 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-07-21 05:07:29,700 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 0 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-21 05:07:29,700 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 122 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-21 05:07:29,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-07-21 05:07:29,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2022-07-21 05:07:29,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-07-21 05:07:29,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2022-07-21 05:07:29,708 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 11 [2022-07-21 05:07:29,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 05:07:29,708 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2022-07-21 05:07:29,708 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 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) [2022-07-21 05:07:29,709 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2022-07-21 05:07:29,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-07-21 05:07:29,710 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 05:07:29,710 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 05:07:29,710 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-07-21 05:07:29,710 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 05:07:29,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 05:07:29,711 INFO L85 PathProgramCache]: Analyzing trace with hash 2110588723, now seen corresponding path program 1 times [2022-07-21 05:07:29,711 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 05:07:29,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1907623582] [2022-07-21 05:07:29,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 05:07:29,712 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 05:07:29,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:29,738 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-07-21 05:07:29,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:29,789 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-07-21 05:07:29,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:29,827 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-07-21 05:07:29,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:29,842 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-21 05:07:29,842 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 05:07:29,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1907623582] [2022-07-21 05:07:29,843 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1907623582] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 05:07:29,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [416959967] [2022-07-21 05:07:29,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 05:07:29,844 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 05:07:29,845 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 05:07:29,846 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) [2022-07-21 05:07:29,848 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-07-21 05:07:29,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:29,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 6 conjunts are in the unsatisfiable core [2022-07-21 05:07:29,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 05:07:30,054 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-21 05:07:30,054 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 05:07:30,288 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-21 05:07:30,289 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [416959967] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 05:07:30,289 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 05:07:30,289 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 13 [2022-07-21 05:07:30,292 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805610009] [2022-07-21 05:07:30,293 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 05:07:30,294 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-07-21 05:07:30,294 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 05:07:30,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-07-21 05:07:30,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2022-07-21 05:07:30,295 INFO L87 Difference]: Start difference. First operand 27 states and 34 transitions. Second operand has 13 states, 10 states have (on average 3.2) internal successors, (32), 13 states have internal predecessors, (32), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 2 states have call predecessors, (8), 8 states have call successors, (8) [2022-07-21 05:07:30,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 05:07:30,474 INFO L93 Difference]: Finished difference Result 55 states and 75 transitions. [2022-07-21 05:07:30,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-07-21 05:07:30,475 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 10 states have (on average 3.2) internal successors, (32), 13 states have internal predecessors, (32), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 2 states have call predecessors, (8), 8 states have call successors, (8) Word has length 23 [2022-07-21 05:07:30,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 05:07:30,476 INFO L225 Difference]: With dead ends: 55 [2022-07-21 05:07:30,476 INFO L226 Difference]: Without dead ends: 31 [2022-07-21 05:07:30,477 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 43 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2022-07-21 05:07:30,478 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 32 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 158 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 05:07:30,478 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 112 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 158 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 05:07:30,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-07-21 05:07:30,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2022-07-21 05:07:30,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 21 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-07-21 05:07:30,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2022-07-21 05:07:30,485 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 23 [2022-07-21 05:07:30,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 05:07:30,485 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2022-07-21 05:07:30,486 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 10 states have (on average 3.2) internal successors, (32), 13 states have internal predecessors, (32), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 2 states have call predecessors, (8), 8 states have call successors, (8) [2022-07-21 05:07:30,486 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2022-07-21 05:07:30,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-07-21 05:07:30,487 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 05:07:30,487 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 05:07:30,513 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-07-21 05:07:30,710 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 05:07:30,711 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 05:07:30,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 05:07:30,711 INFO L85 PathProgramCache]: Analyzing trace with hash 1277869167, now seen corresponding path program 1 times [2022-07-21 05:07:30,711 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 05:07:30,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [27735354] [2022-07-21 05:07:30,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 05:07:30,712 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 05:07:30,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:30,742 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-07-21 05:07:30,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:30,774 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-07-21 05:07:30,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:30,793 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-07-21 05:07:30,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:30,799 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-21 05:07:30,799 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 05:07:30,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [27735354] [2022-07-21 05:07:30,799 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [27735354] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 05:07:30,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1696353446] [2022-07-21 05:07:30,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 05:07:30,802 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 05:07:30,803 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 05:07:30,805 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) [2022-07-21 05:07:30,808 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-07-21 05:07:30,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:30,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2022-07-21 05:07:30,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 05:07:30,912 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-21 05:07:30,912 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 05:07:31,070 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-21 05:07:31,071 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1696353446] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 05:07:31,071 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 05:07:31,071 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 13 [2022-07-21 05:07:31,072 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225905661] [2022-07-21 05:07:31,072 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 05:07:31,072 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-07-21 05:07:31,073 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 05:07:31,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-07-21 05:07:31,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2022-07-21 05:07:31,074 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand has 13 states, 11 states have (on average 2.909090909090909) internal successors, (32), 13 states have internal predecessors, (32), 7 states have call successors, (7), 1 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 7 states have call successors, (7) [2022-07-21 05:07:31,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 05:07:31,206 INFO L93 Difference]: Finished difference Result 51 states and 71 transitions. [2022-07-21 05:07:31,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-21 05:07:31,207 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 2.909090909090909) internal successors, (32), 13 states have internal predecessors, (32), 7 states have call successors, (7), 1 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 7 states have call successors, (7) Word has length 24 [2022-07-21 05:07:31,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 05:07:31,210 INFO L225 Difference]: With dead ends: 51 [2022-07-21 05:07:31,210 INFO L226 Difference]: Without dead ends: 47 [2022-07-21 05:07:31,210 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2022-07-21 05:07:31,211 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 32 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 05:07:31,212 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 92 Invalid, 222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 199 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 05:07:31,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-07-21 05:07:31,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 45. [2022-07-21 05:07:31,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 31 states have internal predecessors, (38), 9 states have call successors, (9), 4 states have call predecessors, (9), 5 states have return successors, (15), 9 states have call predecessors, (15), 9 states have call successors, (15) [2022-07-21 05:07:31,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 62 transitions. [2022-07-21 05:07:31,221 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 62 transitions. Word has length 24 [2022-07-21 05:07:31,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 05:07:31,222 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 62 transitions. [2022-07-21 05:07:31,222 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 2.909090909090909) internal successors, (32), 13 states have internal predecessors, (32), 7 states have call successors, (7), 1 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 7 states have call successors, (7) [2022-07-21 05:07:31,222 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 62 transitions. [2022-07-21 05:07:31,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-07-21 05:07:31,224 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 05:07:31,224 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 05:07:31,257 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-07-21 05:07:31,447 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2022-07-21 05:07:31,448 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 05:07:31,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 05:07:31,448 INFO L85 PathProgramCache]: Analyzing trace with hash -2061621832, now seen corresponding path program 1 times [2022-07-21 05:07:31,448 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 05:07:31,448 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [815422436] [2022-07-21 05:07:31,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 05:07:31,449 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 05:07:31,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:31,471 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-07-21 05:07:31,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:31,487 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-07-21 05:07:31,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:31,513 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-07-21 05:07:31,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:31,530 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-07-21 05:07:31,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:31,534 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2022-07-21 05:07:31,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:31,539 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-07-21 05:07:31,540 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 05:07:31,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [815422436] [2022-07-21 05:07:31,540 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [815422436] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 05:07:31,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [704305345] [2022-07-21 05:07:31,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 05:07:31,541 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 05:07:31,541 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 05:07:31,542 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) [2022-07-21 05:07:31,543 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-07-21 05:07:31,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:31,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 8 conjunts are in the unsatisfiable core [2022-07-21 05:07:31,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 05:07:31,654 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-07-21 05:07:31,654 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 05:07:31,962 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-07-21 05:07:31,962 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [704305345] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 05:07:31,962 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 05:07:31,963 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 9] total 15 [2022-07-21 05:07:31,963 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382104171] [2022-07-21 05:07:31,963 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 05:07:31,964 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-07-21 05:07:31,965 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 05:07:31,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-07-21 05:07:31,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2022-07-21 05:07:31,965 INFO L87 Difference]: Start difference. First operand 45 states and 62 transitions. Second operand has 15 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 15 states have internal predecessors, (47), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) [2022-07-21 05:07:32,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 05:07:32,216 INFO L93 Difference]: Finished difference Result 105 states and 167 transitions. [2022-07-21 05:07:32,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-07-21 05:07:32,217 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 15 states have internal predecessors, (47), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) Word has length 36 [2022-07-21 05:07:32,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 05:07:32,222 INFO L225 Difference]: With dead ends: 105 [2022-07-21 05:07:32,223 INFO L226 Difference]: Without dead ends: 63 [2022-07-21 05:07:32,226 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 75 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2022-07-21 05:07:32,228 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 65 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 05:07:32,228 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 95 Invalid, 243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 193 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-21 05:07:32,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-07-21 05:07:32,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2022-07-21 05:07:32,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 41 states have (on average 1.2439024390243902) internal successors, (51), 44 states have internal predecessors, (51), 12 states have call successors, (12), 5 states have call predecessors, (12), 9 states have return successors, (29), 13 states have call predecessors, (29), 12 states have call successors, (29) [2022-07-21 05:07:32,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 92 transitions. [2022-07-21 05:07:32,243 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 92 transitions. Word has length 36 [2022-07-21 05:07:32,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 05:07:32,243 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 92 transitions. [2022-07-21 05:07:32,244 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 15 states have internal predecessors, (47), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) [2022-07-21 05:07:32,244 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 92 transitions. [2022-07-21 05:07:32,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-07-21 05:07:32,245 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 05:07:32,246 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 05:07:32,265 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-07-21 05:07:32,455 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 05:07:32,456 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 05:07:32,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 05:07:32,456 INFO L85 PathProgramCache]: Analyzing trace with hash 1167294498, now seen corresponding path program 1 times [2022-07-21 05:07:32,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 05:07:32,457 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [921428054] [2022-07-21 05:07:32,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 05:07:32,457 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 05:07:32,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:32,478 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-07-21 05:07:32,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:32,510 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-07-21 05:07:32,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:32,555 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-07-21 05:07:32,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:32,558 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-07-21 05:07:32,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:32,561 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2022-07-21 05:07:32,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:32,571 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-07-21 05:07:32,571 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 05:07:32,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [921428054] [2022-07-21 05:07:32,571 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [921428054] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 05:07:32,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [979390253] [2022-07-21 05:07:32,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 05:07:32,572 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 05:07:32,572 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 05:07:32,573 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 05:07:32,597 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-07-21 05:07:32,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:32,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 8 conjunts are in the unsatisfiable core [2022-07-21 05:07:32,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 05:07:32,695 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-07-21 05:07:32,696 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 05:07:32,975 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-07-21 05:07:32,975 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [979390253] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 05:07:32,975 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 05:07:32,976 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 17 [2022-07-21 05:07:32,976 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244124973] [2022-07-21 05:07:32,976 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 05:07:32,977 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-07-21 05:07:32,977 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 05:07:32,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-07-21 05:07:32,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2022-07-21 05:07:32,978 INFO L87 Difference]: Start difference. First operand 63 states and 92 transitions. Second operand has 17 states, 16 states have (on average 3.0625) internal successors, (49), 17 states have internal predecessors, (49), 10 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (12), 6 states have call predecessors, (12), 10 states have call successors, (12) [2022-07-21 05:07:33,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 05:07:33,325 INFO L93 Difference]: Finished difference Result 177 states and 321 transitions. [2022-07-21 05:07:33,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-07-21 05:07:33,326 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 3.0625) internal successors, (49), 17 states have internal predecessors, (49), 10 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (12), 6 states have call predecessors, (12), 10 states have call successors, (12) Word has length 37 [2022-07-21 05:07:33,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 05:07:33,328 INFO L225 Difference]: With dead ends: 177 [2022-07-21 05:07:33,328 INFO L226 Difference]: Without dead ends: 117 [2022-07-21 05:07:33,329 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=117, Invalid=483, Unknown=0, NotChecked=0, Total=600 [2022-07-21 05:07:33,330 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 53 mSDsluCounter, 179 mSDsCounter, 0 mSdLazyCounter, 437 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 508 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 437 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 05:07:33,330 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 211 Invalid, 508 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 437 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-21 05:07:33,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2022-07-21 05:07:33,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 103. [2022-07-21 05:07:33,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 66 states have (on average 1.2121212121212122) internal successors, (80), 69 states have internal predecessors, (80), 21 states have call successors, (21), 7 states have call predecessors, (21), 15 states have return successors, (65), 26 states have call predecessors, (65), 21 states have call successors, (65) [2022-07-21 05:07:33,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 166 transitions. [2022-07-21 05:07:33,355 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 166 transitions. Word has length 37 [2022-07-21 05:07:33,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 05:07:33,356 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 166 transitions. [2022-07-21 05:07:33,356 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 3.0625) internal successors, (49), 17 states have internal predecessors, (49), 10 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (12), 6 states have call predecessors, (12), 10 states have call successors, (12) [2022-07-21 05:07:33,356 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 166 transitions. [2022-07-21 05:07:33,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-07-21 05:07:33,358 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 05:07:33,358 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 05:07:33,385 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-07-21 05:07:33,559 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 05:07:33,559 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 05:07:33,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 05:07:33,560 INFO L85 PathProgramCache]: Analyzing trace with hash 384535367, now seen corresponding path program 1 times [2022-07-21 05:07:33,560 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 05:07:33,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [128527320] [2022-07-21 05:07:33,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 05:07:33,560 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 05:07:33,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:33,584 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-07-21 05:07:33,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:33,598 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-07-21 05:07:33,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:33,629 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-07-21 05:07:33,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:33,668 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-07-21 05:07:33,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:33,676 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-07-21 05:07:33,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:33,679 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2022-07-21 05:07:33,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:33,689 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2022-07-21 05:07:33,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:33,692 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-07-21 05:07:33,692 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 05:07:33,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [128527320] [2022-07-21 05:07:33,693 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [128527320] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 05:07:33,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1935572708] [2022-07-21 05:07:33,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 05:07:33,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 05:07:33,693 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 05:07:33,694 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 05:07:33,699 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-07-21 05:07:33,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:33,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 8 conjunts are in the unsatisfiable core [2022-07-21 05:07:33,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 05:07:33,821 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-07-21 05:07:33,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 05:07:34,154 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-07-21 05:07:34,155 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1935572708] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 05:07:34,155 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 05:07:34,155 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 16 [2022-07-21 05:07:34,155 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971122210] [2022-07-21 05:07:34,156 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 05:07:34,156 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-07-21 05:07:34,156 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 05:07:34,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-07-21 05:07:34,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2022-07-21 05:07:34,157 INFO L87 Difference]: Start difference. First operand 103 states and 166 transitions. Second operand has 16 states, 15 states have (on average 3.533333333333333) internal successors, (53), 16 states have internal predecessors, (53), 10 states have call successors, (15), 1 states have call predecessors, (15), 6 states have return successors, (17), 9 states have call predecessors, (17), 10 states have call successors, (17) [2022-07-21 05:07:34,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 05:07:34,433 INFO L93 Difference]: Finished difference Result 262 states and 508 transitions. [2022-07-21 05:07:34,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-07-21 05:07:34,434 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 3.533333333333333) internal successors, (53), 16 states have internal predecessors, (53), 10 states have call successors, (15), 1 states have call predecessors, (15), 6 states have return successors, (17), 9 states have call predecessors, (17), 10 states have call successors, (17) Word has length 51 [2022-07-21 05:07:34,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 05:07:34,442 INFO L225 Difference]: With dead ends: 262 [2022-07-21 05:07:34,442 INFO L226 Difference]: Without dead ends: 162 [2022-07-21 05:07:34,443 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 111 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=96, Invalid=366, Unknown=0, NotChecked=0, Total=462 [2022-07-21 05:07:34,444 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 41 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 306 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 306 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 05:07:34,445 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 150 Invalid, 349 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 306 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-21 05:07:34,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2022-07-21 05:07:34,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 139. [2022-07-21 05:07:34,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 89 states have (on average 1.202247191011236) internal successors, (107), 91 states have internal predecessors, (107), 31 states have call successors, (31), 10 states have call predecessors, (31), 18 states have return successors, (103), 37 states have call predecessors, (103), 31 states have call successors, (103) [2022-07-21 05:07:34,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 241 transitions. [2022-07-21 05:07:34,494 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 241 transitions. Word has length 51 [2022-07-21 05:07:34,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 05:07:34,495 INFO L495 AbstractCegarLoop]: Abstraction has 139 states and 241 transitions. [2022-07-21 05:07:34,495 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 3.533333333333333) internal successors, (53), 16 states have internal predecessors, (53), 10 states have call successors, (15), 1 states have call predecessors, (15), 6 states have return successors, (17), 9 states have call predecessors, (17), 10 states have call successors, (17) [2022-07-21 05:07:34,495 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 241 transitions. [2022-07-21 05:07:34,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-07-21 05:07:34,498 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 05:07:34,499 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 05:07:34,525 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-07-21 05:07:34,699 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 05:07:34,699 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 05:07:34,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 05:07:34,700 INFO L85 PathProgramCache]: Analyzing trace with hash -1130362923, now seen corresponding path program 1 times [2022-07-21 05:07:34,700 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 05:07:34,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1745037126] [2022-07-21 05:07:34,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 05:07:34,700 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 05:07:34,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:34,742 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-07-21 05:07:34,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:34,760 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-07-21 05:07:34,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:34,786 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-07-21 05:07:34,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:34,822 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-07-21 05:07:34,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:34,827 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-07-21 05:07:34,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:34,830 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2022-07-21 05:07:34,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:34,833 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2022-07-21 05:07:34,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:34,844 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 19 proven. 11 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-07-21 05:07:34,844 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 05:07:34,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1745037126] [2022-07-21 05:07:34,844 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1745037126] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 05:07:34,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689430911] [2022-07-21 05:07:34,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 05:07:34,845 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 05:07:34,845 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 05:07:34,846 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 05:07:34,851 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-07-21 05:07:34,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:34,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 6 conjunts are in the unsatisfiable core [2022-07-21 05:07:34,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 05:07:34,938 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 18 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-07-21 05:07:34,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 05:07:35,123 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 18 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-07-21 05:07:35,124 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [689430911] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 05:07:35,125 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 05:07:35,125 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7, 7] total 17 [2022-07-21 05:07:35,125 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629690427] [2022-07-21 05:07:35,125 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 05:07:35,126 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-07-21 05:07:35,126 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 05:07:35,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-07-21 05:07:35,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2022-07-21 05:07:35,127 INFO L87 Difference]: Start difference. First operand 139 states and 241 transitions. Second operand has 17 states, 16 states have (on average 3.3125) internal successors, (53), 17 states have internal predecessors, (53), 8 states have call successors, (14), 1 states have call predecessors, (14), 6 states have return successors, (16), 10 states have call predecessors, (16), 8 states have call successors, (16) [2022-07-21 05:07:35,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 05:07:35,360 INFO L93 Difference]: Finished difference Result 301 states and 580 transitions. [2022-07-21 05:07:35,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-07-21 05:07:35,361 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 3.3125) internal successors, (53), 17 states have internal predecessors, (53), 8 states have call successors, (14), 1 states have call predecessors, (14), 6 states have return successors, (16), 10 states have call predecessors, (16), 8 states have call successors, (16) Word has length 52 [2022-07-21 05:07:35,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 05:07:35,364 INFO L225 Difference]: With dead ends: 301 [2022-07-21 05:07:35,364 INFO L226 Difference]: Without dead ends: 98 [2022-07-21 05:07:35,365 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=92, Invalid=370, Unknown=0, NotChecked=0, Total=462 [2022-07-21 05:07:35,366 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 80 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 266 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 345 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 05:07:35,366 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [93 Valid, 119 Invalid, 345 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 266 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-21 05:07:35,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-07-21 05:07:35,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 80. [2022-07-21 05:07:35,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 52 states have (on average 1.1730769230769231) internal successors, (61), 54 states have internal predecessors, (61), 16 states have call successors, (16), 6 states have call predecessors, (16), 11 states have return successors, (46), 19 states have call predecessors, (46), 16 states have call successors, (46) [2022-07-21 05:07:35,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 123 transitions. [2022-07-21 05:07:35,385 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 123 transitions. Word has length 52 [2022-07-21 05:07:35,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 05:07:35,385 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 123 transitions. [2022-07-21 05:07:35,386 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 3.3125) internal successors, (53), 17 states have internal predecessors, (53), 8 states have call successors, (14), 1 states have call predecessors, (14), 6 states have return successors, (16), 10 states have call predecessors, (16), 8 states have call successors, (16) [2022-07-21 05:07:35,386 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 123 transitions. [2022-07-21 05:07:35,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-07-21 05:07:35,388 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 05:07:35,388 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 05:07:35,412 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-07-21 05:07:35,588 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 05:07:35,589 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 05:07:35,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 05:07:35,589 INFO L85 PathProgramCache]: Analyzing trace with hash -492645000, now seen corresponding path program 2 times [2022-07-21 05:07:35,589 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 05:07:35,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [298682891] [2022-07-21 05:07:35,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 05:07:35,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 05:07:35,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:35,617 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-07-21 05:07:35,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:35,641 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-07-21 05:07:35,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:35,676 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-07-21 05:07:35,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:35,716 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-07-21 05:07:35,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:35,731 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-07-21 05:07:35,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:35,735 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2022-07-21 05:07:35,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:35,741 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2022-07-21 05:07:35,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:35,758 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-07-21 05:07:35,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:35,777 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-07-21 05:07:35,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 05:07:35,803 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 37 proven. 23 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-07-21 05:07:35,803 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 05:07:35,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [298682891] [2022-07-21 05:07:35,803 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [298682891] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 05:07:35,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [204448076] [2022-07-21 05:07:35,804 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-21 05:07:35,804 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 05:07:35,804 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 05:07:35,808 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 05:07:35,809 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-07-21 05:07:35,856 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-21 05:07:35,856 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-21 05:07:35,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 8 conjunts are in the unsatisfiable core [2022-07-21 05:07:35,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 05:07:35,923 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 38 proven. 8 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-07-21 05:07:35,923 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 05:07:36,220 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 38 proven. 9 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2022-07-21 05:07:36,220 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [204448076] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 05:07:36,220 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 05:07:36,221 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 8, 9] total 22 [2022-07-21 05:07:36,221 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397025083] [2022-07-21 05:07:36,221 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 05:07:36,222 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-07-21 05:07:36,222 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 05:07:36,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-07-21 05:07:36,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=389, Unknown=0, NotChecked=0, Total=462 [2022-07-21 05:07:36,223 INFO L87 Difference]: Start difference. First operand 80 states and 123 transitions. Second operand has 22 states, 21 states have (on average 3.2857142857142856) internal successors, (69), 22 states have internal predecessors, (69), 12 states have call successors, (19), 1 states have call predecessors, (19), 9 states have return successors, (22), 14 states have call predecessors, (22), 12 states have call successors, (22) [2022-07-21 05:07:36,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 05:07:36,562 INFO L93 Difference]: Finished difference Result 171 states and 290 transitions. [2022-07-21 05:07:36,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-07-21 05:07:36,562 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 3.2857142857142856) internal successors, (69), 22 states have internal predecessors, (69), 12 states have call successors, (19), 1 states have call predecessors, (19), 9 states have return successors, (22), 14 states have call predecessors, (22), 12 states have call successors, (22) Word has length 66 [2022-07-21 05:07:36,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 05:07:36,564 INFO L225 Difference]: With dead ends: 171 [2022-07-21 05:07:36,564 INFO L226 Difference]: Without dead ends: 86 [2022-07-21 05:07:36,565 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 142 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=161, Invalid=769, Unknown=0, NotChecked=0, Total=930 [2022-07-21 05:07:36,565 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 78 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 404 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 476 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 404 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 05:07:36,565 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [94 Valid, 167 Invalid, 476 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 404 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-21 05:07:36,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-07-21 05:07:36,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 77. [2022-07-21 05:07:36,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 53 states have (on average 1.150943396226415) internal successors, (61), 52 states have internal predecessors, (61), 12 states have call successors, (12), 8 states have call predecessors, (12), 11 states have return successors, (31), 16 states have call predecessors, (31), 12 states have call successors, (31) [2022-07-21 05:07:36,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 104 transitions. [2022-07-21 05:07:36,572 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 104 transitions. Word has length 66 [2022-07-21 05:07:36,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 05:07:36,572 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 104 transitions. [2022-07-21 05:07:36,572 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 3.2857142857142856) internal successors, (69), 22 states have internal predecessors, (69), 12 states have call successors, (19), 1 states have call predecessors, (19), 9 states have return successors, (22), 14 states have call predecessors, (22), 12 states have call successors, (22) [2022-07-21 05:07:36,573 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 104 transitions. [2022-07-21 05:07:36,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-07-21 05:07:36,573 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 05:07:36,575 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 05:07:36,600 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-07-21 05:07:36,795 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 05:07:36,795 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-21 05:07:36,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 05:07:36,796 INFO L85 PathProgramCache]: Analyzing trace with hash 780870354, now seen corresponding path program 1 times [2022-07-21 05:07:36,796 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 05:07:36,796 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1320404405] [2022-07-21 05:07:36,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 05:07:36,796 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 05:07:36,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-21 05:07:36,808 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-07-21 05:07:36,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-21 05:07:36,834 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-07-21 05:07:36,834 INFO L271 BasicCegarLoop]: Counterexample is feasible [2022-07-21 05:07:36,835 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-07-21 05:07:36,836 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-07-21 05:07:36,839 INFO L356 BasicCegarLoop]: Path program histogram: [2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 05:07:36,842 INFO L176 ceAbstractionStarter]: Computing trace abstraction results [2022-07-21 05:07:36,871 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 05:07:36 BoogieIcfgContainer [2022-07-21 05:07:36,871 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-07-21 05:07:36,872 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2022-07-21 05:07:36,872 INFO L271 PluginConnector]: Initializing Witness Printer... [2022-07-21 05:07:36,872 INFO L275 PluginConnector]: Witness Printer initialized [2022-07-21 05:07:36,873 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 05:07:29" (3/4) ... [2022-07-21 05:07:36,874 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2022-07-21 05:07:36,912 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2022-07-21 05:07:36,912 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2022-07-21 05:07:36,913 INFO L158 Benchmark]: Toolchain (without parser) took 8389.99ms. Allocated memory was 52.4MB in the beginning and 96.5MB in the end (delta: 44.0MB). Free memory was 29.2MB in the beginning and 38.0MB in the end (delta: -8.8MB). Peak memory consumption was 36.4MB. Max. memory is 16.1GB. [2022-07-21 05:07:36,913 INFO L158 Benchmark]: CDTParser took 0.22ms. Allocated memory is still 52.4MB. Free memory was 34.0MB in the beginning and 33.9MB in the end (delta: 25.1kB). There was no memory consumed. Max. memory is 16.1GB. [2022-07-21 05:07:36,913 INFO L158 Benchmark]: CACSL2BoogieTranslator took 173.77ms. Allocated memory is still 52.4MB. Free memory was 28.9MB in the beginning and 33.0MB in the end (delta: -4.1MB). Peak memory consumption was 7.2MB. Max. memory is 16.1GB. [2022-07-21 05:07:36,914 INFO L158 Benchmark]: Boogie Procedure Inliner took 63.05ms. Allocated memory was 52.4MB in the beginning and 65.0MB in the end (delta: 12.6MB). Free memory was 33.0MB in the beginning and 48.0MB in the end (delta: -15.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-07-21 05:07:36,914 INFO L158 Benchmark]: Boogie Preprocessor took 31.98ms. Allocated memory is still 65.0MB. Free memory was 48.0MB in the beginning and 47.1MB in the end (delta: 891.0kB). There was no memory consumed. Max. memory is 16.1GB. [2022-07-21 05:07:36,914 INFO L158 Benchmark]: RCFGBuilder took 300.36ms. Allocated memory is still 65.0MB. Free memory was 47.0MB in the beginning and 37.9MB in the end (delta: 9.1MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2022-07-21 05:07:36,914 INFO L158 Benchmark]: TraceAbstraction took 7774.59ms. Allocated memory was 65.0MB in the beginning and 96.5MB in the end (delta: 31.5MB). Free memory was 37.4MB in the beginning and 40.1MB in the end (delta: -2.7MB). Peak memory consumption was 31.3MB. Max. memory is 16.1GB. [2022-07-21 05:07:36,915 INFO L158 Benchmark]: Witness Printer took 40.16ms. Allocated memory is still 96.5MB. Free memory was 40.1MB in the beginning and 38.0MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-07-21 05:07:36,916 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 52.4MB. Free memory was 34.0MB in the beginning and 33.9MB in the end (delta: 25.1kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 173.77ms. Allocated memory is still 52.4MB. Free memory was 28.9MB in the beginning and 33.0MB in the end (delta: -4.1MB). Peak memory consumption was 7.2MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 63.05ms. Allocated memory was 52.4MB in the beginning and 65.0MB in the end (delta: 12.6MB). Free memory was 33.0MB in the beginning and 48.0MB in the end (delta: -15.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 31.98ms. Allocated memory is still 65.0MB. Free memory was 48.0MB in the beginning and 47.1MB in the end (delta: 891.0kB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 300.36ms. Allocated memory is still 65.0MB. Free memory was 47.0MB in the beginning and 37.9MB in the end (delta: 9.1MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * TraceAbstraction took 7774.59ms. Allocated memory was 65.0MB in the beginning and 96.5MB in the end (delta: 31.5MB). Free memory was 37.4MB in the beginning and 40.1MB in the end (delta: -2.7MB). Peak memory consumption was 31.3MB. Max. memory is 16.1GB. * Witness Printer took 40.16ms. Allocated memory is still 96.5MB. Free memory was 40.1MB in the beginning and 38.0MB in the end (delta: 2.1MB). 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, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 41]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L38] int x = 4; VAL [x=4] [L39] CALL, EXPR fibo1(x) VAL [\old(n)=4] [L10] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L12] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L20] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L22] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L10] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L12] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L20] COND TRUE n < 1 [L21] return 0; VAL [\old(n)=0, \result=0, n=0] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L10] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L12] COND TRUE n == 1 [L13] return 1; VAL [\old(n)=1, \result=1, n=1] [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L20] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L22] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L10] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L12] COND TRUE n == 1 [L13] return 1; VAL [\old(n)=1, \result=1, n=1] [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L10] COND TRUE n < 1 [L11] return 0; VAL [\old(n)=0, \result=0, n=0] [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L15] return fibo2(n-1) + fibo2(n-2); [L39] RET, EXPR fibo1(x) VAL [fibo1(x)=3, x=4] [L39] int result = fibo1(x); [L40] COND TRUE result == 3 VAL [result=3, x=4] [L41] reach_error() VAL [result=3, x=4] - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 29 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 7.7s, OverallIterations: 10, TraceHistogramMax: 5, PathProgramHistogramMax: 2, EmptinessCheckTime: 0.0s, AutomataDifference: 2.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 447 SdHoareTripleChecker+Valid, 1.2s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 385 mSDsluCounter, 1191 SdHoareTripleChecker+Invalid, 1.0s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 945 mSDsCounter, 352 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 1991 IncrementalHoareTripleChecker+Invalid, 2343 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 352 mSolverCounterUnsat, 246 mSDtfsCounter, 1991 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 781 GetRequests, 618 SyntacticMatches, 17 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 538 ImplicationChecksByTransitivity, 1.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=139occurred in iteration=7, InterpolantAutomatonStates: 111, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 9 MinimizatonAttempts, 70 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 3.3s InterpolantComputationTime, 664 NumberOfCodeBlocks, 664 NumberOfCodeBlocksAsserted, 18 NumberOfCheckSat, 865 ConstructedInterpolants, 0 QuantifiedInterpolants, 1897 SizeOfPredicates, 18 NumberOfNonLiveVariables, 808 ConjunctsInSsa, 50 ConjunctsInUnsatCore, 23 InterpolantComputations, 2 PerfectInterpolantSequences, 494/648 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! [2022-07-21 05:07:36,954 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... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE