./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/id_i15_o15-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5fbdf5bf Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/recursive-simple/id_i15_o15-2.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 81c3a4bcb7df13b97375e2abc10c6fdc1a8edbd3 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.1-wip.dd.seqcomp-5fbdf5b [2021-08-29 16:32:26,009 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-29 16:32:26,010 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-29 16:32:26,035 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-08-29 16:32:26,036 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-08-29 16:32:26,037 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-08-29 16:32:26,038 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-08-29 16:32:26,039 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-08-29 16:32:26,041 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-08-29 16:32:26,041 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-08-29 16:32:26,042 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-08-29 16:32:26,043 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-08-29 16:32:26,043 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-08-29 16:32:26,044 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-08-29 16:32:26,045 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-08-29 16:32:26,046 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-08-29 16:32:26,047 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-08-29 16:32:26,047 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-08-29 16:32:26,049 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-08-29 16:32:26,050 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-08-29 16:32:26,051 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-08-29 16:32:26,052 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-08-29 16:32:26,053 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-08-29 16:32:26,054 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-08-29 16:32:26,056 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-08-29 16:32:26,056 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-08-29 16:32:26,056 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-08-29 16:32:26,064 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-08-29 16:32:26,065 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-08-29 16:32:26,066 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-08-29 16:32:26,066 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-08-29 16:32:26,066 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-08-29 16:32:26,067 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-08-29 16:32:26,068 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-08-29 16:32:26,068 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-08-29 16:32:26,069 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-08-29 16:32:26,069 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-08-29 16:32:26,069 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-08-29 16:32:26,070 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-08-29 16:32:26,070 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-08-29 16:32:26,071 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-08-29 16:32:26,072 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-08-29 16:32:26,093 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-29 16:32:26,093 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-29 16:32:26,094 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-08-29 16:32:26,094 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-08-29 16:32:26,095 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-29 16:32:26,095 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-29 16:32:26,095 INFO L138 SettingsManager]: * Use SBE=true [2021-08-29 16:32:26,095 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-29 16:32:26,095 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-29 16:32:26,096 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-29 16:32:26,096 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-29 16:32:26,096 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-29 16:32:26,096 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-08-29 16:32:26,096 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-29 16:32:26,096 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-08-29 16:32:26,096 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-29 16:32:26,097 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-08-29 16:32:26,097 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-29 16:32:26,097 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-08-29 16:32:26,097 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-29 16:32:26,097 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-29 16:32:26,097 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-29 16:32:26,097 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-29 16:32:26,098 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-29 16:32:26,098 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-29 16:32:26,098 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-08-29 16:32:26,098 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-29 16:32:26,098 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-29 16:32:26,098 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-08-29 16:32:26,098 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-08-29 16:32:26,098 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 81c3a4bcb7df13b97375e2abc10c6fdc1a8edbd3 [2021-08-29 16:32:26,390 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-29 16:32:26,413 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-29 16:32:26,417 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-29 16:32:26,418 INFO L271 PluginConnector]: Initializing CDTParser... [2021-08-29 16:32:26,419 INFO L275 PluginConnector]: CDTParser initialized [2021-08-29 16:32:26,420 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/id_i15_o15-2.c [2021-08-29 16:32:26,480 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e1de9a685/2c1e3f3c278d4e27ba0353ee8b51db23/FLAGaf0104604 [2021-08-29 16:32:26,834 INFO L306 CDTParser]: Found 1 translation units. [2021-08-29 16:32:26,834 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id_i15_o15-2.c [2021-08-29 16:32:26,839 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e1de9a685/2c1e3f3c278d4e27ba0353ee8b51db23/FLAGaf0104604 [2021-08-29 16:32:27,233 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e1de9a685/2c1e3f3c278d4e27ba0353ee8b51db23 [2021-08-29 16:32:27,235 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-29 16:32:27,236 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-08-29 16:32:27,236 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-08-29 16:32:27,236 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-08-29 16:32:27,253 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-08-29 16:32:27,254 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.08 04:32:27" (1/1) ... [2021-08-29 16:32:27,255 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@61c44107 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:27, skipping insertion in model container [2021-08-29 16:32:27,255 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.08 04:32:27" (1/1) ... [2021-08-29 16:32:27,259 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-08-29 16:32:27,267 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-08-29 16:32:27,356 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id_i15_o15-2.c[454,467] [2021-08-29 16:32:27,359 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-29 16:32:27,369 INFO L203 MainTranslator]: Completed pre-run [2021-08-29 16:32:27,379 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id_i15_o15-2.c[454,467] [2021-08-29 16:32:27,382 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-29 16:32:27,394 INFO L208 MainTranslator]: Completed translation [2021-08-29 16:32:27,394 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:27 WrapperNode [2021-08-29 16:32:27,396 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-08-29 16:32:27,397 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-08-29 16:32:27,397 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-08-29 16:32:27,397 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-08-29 16:32:27,404 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:27" (1/1) ... [2021-08-29 16:32:27,412 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:27" (1/1) ... [2021-08-29 16:32:27,425 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-08-29 16:32:27,426 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-29 16:32:27,426 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-29 16:32:27,427 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-29 16:32:27,440 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:27" (1/1) ... [2021-08-29 16:32:27,440 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:27" (1/1) ... [2021-08-29 16:32:27,442 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:27" (1/1) ... [2021-08-29 16:32:27,443 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:27" (1/1) ... [2021-08-29 16:32:27,447 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:27" (1/1) ... [2021-08-29 16:32:27,448 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:27" (1/1) ... [2021-08-29 16:32:27,466 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:27" (1/1) ... [2021-08-29 16:32:27,468 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-29 16:32:27,470 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-29 16:32:27,470 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-29 16:32:27,470 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-29 16:32:27,471 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:27" (1/1) ... [2021-08-29 16:32:27,476 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-29 16:32:27,483 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:32:27,492 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-08-29 16:32:27,494 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-08-29 16:32:27,522 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-29 16:32:27,523 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-29 16:32:27,523 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-08-29 16:32:27,523 INFO L130 BoogieDeclarations]: Found specification of procedure id [2021-08-29 16:32:27,523 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2021-08-29 16:32:27,524 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-08-29 16:32:27,660 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-29 16:32:27,661 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-08-29 16:32:27,665 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.08 04:32:27 BoogieIcfgContainer [2021-08-29 16:32:27,665 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-29 16:32:27,667 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-29 16:32:27,667 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-29 16:32:27,669 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-29 16:32:27,669 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 29.08 04:32:27" (1/3) ... [2021-08-29 16:32:27,670 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f3f227c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.08 04:32:27, skipping insertion in model container [2021-08-29 16:32:27,670 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 04:32:27" (2/3) ... [2021-08-29 16:32:27,671 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f3f227c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.08 04:32:27, skipping insertion in model container [2021-08-29 16:32:27,671 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.08 04:32:27" (3/3) ... [2021-08-29 16:32:27,672 INFO L111 eAbstractionObserver]: Analyzing ICFG id_i15_o15-2.c [2021-08-29 16:32:27,680 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-29 16:32:27,681 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-08-29 16:32:27,727 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-08-29 16:32:27,735 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-08-29 16:32:27,735 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-08-29 16:32:27,750 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-08-29 16:32:27,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-08-29 16:32:27,754 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:32:27,754 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:32:27,755 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:32:27,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:32:27,768 INFO L82 PathProgramCache]: Analyzing trace with hash -358017204, now seen corresponding path program 1 times [2021-08-29 16:32:27,775 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:32:27,775 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1374875765] [2021-08-29 16:32:27,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:27,776 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:32:27,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:27,978 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:27,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:28,034 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-29 16:32:28,035 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:32:28,035 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1374875765] [2021-08-29 16:32:28,035 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1374875765] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-29 16:32:28,036 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-29 16:32:28,036 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-29 16:32:28,037 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692515296] [2021-08-29 16:32:28,040 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-29 16:32:28,040 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:32:28,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-29 16:32:28,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-29 16:32:28,075 INFO L87 Difference]: Start difference. First operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-29 16:32:28,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:32:28,164 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2021-08-29 16:32:28,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-29 16:32:28,166 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-08-29 16:32:28,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:32:28,171 INFO L225 Difference]: With dead ends: 25 [2021-08-29 16:32:28,171 INFO L226 Difference]: Without dead ends: 15 [2021-08-29 16:32:28,174 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 61.65ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-08-29 16:32:28,177 INFO L928 BasicCegarLoop]: 2 mSDtfsCounter, 11 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 47.73ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.09ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 55.94ms IncrementalHoareTripleChecker+Time [2021-08-29 16:32:28,180 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 3 Invalid, 50 Unknown, 0 Unchecked, 1.09ms Time], IncrementalHoareTripleChecker [0 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 55.94ms Time] [2021-08-29 16:32:28,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-08-29 16:32:28,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-08-29 16:32:28,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.1) internal successors, (11), 11 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-08-29 16:32:28,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-08-29 16:32:28,218 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2021-08-29 16:32:28,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:32:28,218 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-08-29 16:32:28,219 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-29 16:32:28,219 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-08-29 16:32:28,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-08-29 16:32:28,220 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:32:28,221 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:32:28,221 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-29 16:32:28,222 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:32:28,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:32:28,224 INFO L82 PathProgramCache]: Analyzing trace with hash 679465686, now seen corresponding path program 1 times [2021-08-29 16:32:28,224 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:32:28,224 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [986072013] [2021-08-29 16:32:28,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:28,225 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:32:28,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:28,283 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:28,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:28,329 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:28,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:28,358 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-08-29 16:32:28,358 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:32:28,359 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [986072013] [2021-08-29 16:32:28,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [986072013] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:32:28,360 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [879954094] [2021-08-29 16:32:28,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:28,361 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:28,361 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:32:28,366 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:32:28,388 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-08-29 16:32:28,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:28,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 6 conjunts are in the unsatisfiable core [2021-08-29 16:32:28,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:32:28,574 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-08-29 16:32:28,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:32:28,809 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-29 16:32:28,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [879954094] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:32:28,814 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:32:28,814 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 12 [2021-08-29 16:32:28,815 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466846941] [2021-08-29 16:32:28,816 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-08-29 16:32:28,816 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:32:28,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-08-29 16:32:28,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-08-29 16:32:28,820 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 12 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 12 states have internal predecessors, (21), 6 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 2 states have call predecessors, (6), 6 states have call successors, (6) [2021-08-29 16:32:28,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:32:28,892 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2021-08-29 16:32:28,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-08-29 16:32:28,892 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 12 states have internal predecessors, (21), 6 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 2 states have call predecessors, (6), 6 states have call successors, (6) Word has length 16 [2021-08-29 16:32:28,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:32:28,894 INFO L225 Difference]: With dead ends: 22 [2021-08-29 16:32:28,894 INFO L226 Difference]: Without dead ends: 18 [2021-08-29 16:32:28,895 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 80.60ms TimeCoverageRelationStatistics Valid=54, Invalid=128, Unknown=0, NotChecked=0, Total=182 [2021-08-29 16:32:28,899 INFO L928 BasicCegarLoop]: 2 mSDtfsCounter, 31 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 35.09ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.70ms SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 42.83ms IncrementalHoareTripleChecker+Time [2021-08-29 16:32:28,900 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 3 Invalid, 57 Unknown, 0 Unchecked, 2.70ms Time], IncrementalHoareTripleChecker [11 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 42.83ms Time] [2021-08-29 16:32:28,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-08-29 16:32:28,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-08-29 16:32:28,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 13 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-08-29 16:32:28,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-08-29 16:32:28,909 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 16 [2021-08-29 16:32:28,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:32:28,910 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-08-29 16:32:28,910 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 12 states have internal predecessors, (21), 6 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 2 states have call predecessors, (6), 6 states have call successors, (6) [2021-08-29 16:32:28,910 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-08-29 16:32:28,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-08-29 16:32:28,915 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:32:28,915 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:32:28,943 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-08-29 16:32:29,138 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:29,139 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:32:29,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:32:29,139 INFO L82 PathProgramCache]: Analyzing trace with hash -41010676, now seen corresponding path program 2 times [2021-08-29 16:32:29,140 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:32:29,140 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [619747351] [2021-08-29 16:32:29,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:29,140 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:32:29,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:29,178 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:29,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:29,199 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:29,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:29,215 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:29,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:29,228 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-08-29 16:32:29,228 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:32:29,228 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [619747351] [2021-08-29 16:32:29,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [619747351] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:32:29,229 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [194177040] [2021-08-29 16:32:29,229 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-29 16:32:29,229 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:29,229 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:32:29,230 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:32:29,248 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-08-29 16:32:29,277 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-29 16:32:29,277 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-29 16:32:29,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 8 conjunts are in the unsatisfiable core [2021-08-29 16:32:29,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:32:29,413 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-08-29 16:32:29,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:32:29,751 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-08-29 16:32:29,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [194177040] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:32:29,752 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:32:29,752 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 14 [2021-08-29 16:32:29,752 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [986647574] [2021-08-29 16:32:29,753 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-08-29 16:32:29,753 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:32:29,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-08-29 16:32:29,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2021-08-29 16:32:29,755 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 14 states, 11 states have (on average 2.272727272727273) internal successors, (25), 14 states have internal predecessors, (25), 7 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (9), 3 states have call predecessors, (9), 7 states have call successors, (9) [2021-08-29 16:32:29,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:32:29,846 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2021-08-29 16:32:29,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-08-29 16:32:29,847 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 2.272727272727273) internal successors, (25), 14 states have internal predecessors, (25), 7 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (9), 3 states have call predecessors, (9), 7 states have call successors, (9) Word has length 22 [2021-08-29 16:32:29,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:32:29,848 INFO L225 Difference]: With dead ends: 25 [2021-08-29 16:32:29,848 INFO L226 Difference]: Without dead ends: 21 [2021-08-29 16:32:29,848 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 84.46ms TimeCoverageRelationStatistics Valid=81, Invalid=191, Unknown=0, NotChecked=0, Total=272 [2021-08-29 16:32:29,851 INFO L928 BasicCegarLoop]: 2 mSDtfsCounter, 27 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 43.50ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.81ms SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 65.04ms IncrementalHoareTripleChecker+Time [2021-08-29 16:32:29,852 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 4 Invalid, 95 Unknown, 0 Unchecked, 1.81ms Time], IncrementalHoareTripleChecker [9 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 65.04ms Time] [2021-08-29 16:32:29,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-08-29 16:32:29,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-08-29 16:32:29,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 15 states have internal predecessors, (15), 2 states have call successors, (2), 1 states have call predecessors, (2), 4 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-08-29 16:32:29,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2021-08-29 16:32:29,863 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 22 [2021-08-29 16:32:29,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:32:29,864 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2021-08-29 16:32:29,864 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 2.272727272727273) internal successors, (25), 14 states have internal predecessors, (25), 7 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (9), 3 states have call predecessors, (9), 7 states have call successors, (9) [2021-08-29 16:32:29,864 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2021-08-29 16:32:29,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-08-29 16:32:29,867 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:32:29,868 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:32:29,888 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-08-29 16:32:30,072 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-08-29 16:32:30,073 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:32:30,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:32:30,074 INFO L82 PathProgramCache]: Analyzing trace with hash 1769866774, now seen corresponding path program 3 times [2021-08-29 16:32:30,074 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:32:30,074 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [950245680] [2021-08-29 16:32:30,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:30,074 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:32:30,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:30,112 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:30,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:30,144 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:30,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:30,160 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:30,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:30,173 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:30,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:30,185 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-08-29 16:32:30,185 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:32:30,185 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [950245680] [2021-08-29 16:32:30,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [950245680] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:32:30,186 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1356110764] [2021-08-29 16:32:30,186 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-08-29 16:32:30,186 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:30,186 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:32:30,190 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:32:30,194 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-08-29 16:32:30,237 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-08-29 16:32:30,237 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-29 16:32:30,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 10 conjunts are in the unsatisfiable core [2021-08-29 16:32:30,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:32:30,410 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-08-29 16:32:30,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:32:30,842 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-08-29 16:32:30,843 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1356110764] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:32:30,843 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:32:30,843 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11, 11] total 26 [2021-08-29 16:32:30,843 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [10759480] [2021-08-29 16:32:30,843 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-08-29 16:32:30,844 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:32:30,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-08-29 16:32:30,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=550, Unknown=0, NotChecked=0, Total=650 [2021-08-29 16:32:30,845 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 26 states, 25 states have (on average 1.52) internal successors, (38), 18 states have internal predecessors, (38), 3 states have call successors, (4), 1 states have call predecessors, (4), 12 states have return successors, (12), 12 states have call predecessors, (12), 3 states have call successors, (12) [2021-08-29 16:32:31,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:32:31,115 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2021-08-29 16:32:31,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-08-29 16:32:31,116 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.52) internal successors, (38), 18 states have internal predecessors, (38), 3 states have call successors, (4), 1 states have call predecessors, (4), 12 states have return successors, (12), 12 states have call predecessors, (12), 3 states have call successors, (12) Word has length 28 [2021-08-29 16:32:31,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:32:31,117 INFO L225 Difference]: With dead ends: 39 [2021-08-29 16:32:31,117 INFO L226 Difference]: Without dead ends: 33 [2021-08-29 16:32:31,118 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 311 ImplicationChecksByTransitivity, 389.14ms TimeCoverageRelationStatistics Valid=252, Invalid=1388, Unknown=0, NotChecked=0, Total=1640 [2021-08-29 16:32:31,119 INFO L928 BasicCegarLoop]: 2 mSDtfsCounter, 13 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 80.57ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.15ms SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 100.14ms IncrementalHoareTripleChecker+Time [2021-08-29 16:32:31,119 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 12 Invalid, 197 Unknown, 0 Unchecked, 2.15ms Time], IncrementalHoareTripleChecker [13 Valid, 184 Invalid, 0 Unknown, 0 Unchecked, 100.14ms Time] [2021-08-29 16:32:31,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-08-29 16:32:31,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-08-29 16:32:31,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 22 states have (on average 1.0454545454545454) internal successors, (23), 23 states have internal predecessors, (23), 2 states have call successors, (2), 1 states have call predecessors, (2), 8 states have return successors, (9), 8 states have call predecessors, (9), 2 states have call successors, (9) [2021-08-29 16:32:31,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2021-08-29 16:32:31,125 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 28 [2021-08-29 16:32:31,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:32:31,125 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2021-08-29 16:32:31,126 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 1.52) internal successors, (38), 18 states have internal predecessors, (38), 3 states have call successors, (4), 1 states have call predecessors, (4), 12 states have return successors, (12), 12 states have call predecessors, (12), 3 states have call successors, (12) [2021-08-29 16:32:31,126 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2021-08-29 16:32:31,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-08-29 16:32:31,127 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:32:31,127 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:32:31,151 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-08-29 16:32:31,340 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:31,341 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:32:31,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:32:31,341 INFO L82 PathProgramCache]: Analyzing trace with hash -626238314, now seen corresponding path program 4 times [2021-08-29 16:32:31,341 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:32:31,342 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [598083554] [2021-08-29 16:32:31,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:31,342 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:32:31,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:31,381 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:31,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:31,420 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:31,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:31,449 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:31,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:31,479 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:31,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:31,505 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:31,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:31,526 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:31,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:31,553 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:31,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:31,570 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:31,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:31,584 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-08-29 16:32:31,585 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:32:31,585 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [598083554] [2021-08-29 16:32:31,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [598083554] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:32:31,585 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1146971817] [2021-08-29 16:32:31,585 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-08-29 16:32:31,585 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:31,585 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:32:31,586 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:32:31,616 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-08-29 16:32:31,644 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-08-29 16:32:31,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-29 16:32:31,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 18 conjunts are in the unsatisfiable core [2021-08-29 16:32:31,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:32:31,830 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-08-29 16:32:31,830 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:32:33,643 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-08-29 16:32:33,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1146971817] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:32:33,644 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:32:33,644 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 19] total 24 [2021-08-29 16:32:33,644 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855135348] [2021-08-29 16:32:33,645 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-08-29 16:32:33,645 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:32:33,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-08-29 16:32:33,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=407, Unknown=0, NotChecked=0, Total=552 [2021-08-29 16:32:33,646 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 24 states, 21 states have (on average 2.142857142857143) internal successors, (45), 24 states have internal predecessors, (45), 12 states have call successors, (12), 1 states have call predecessors, (12), 9 states have return successors, (24), 8 states have call predecessors, (24), 12 states have call successors, (24) [2021-08-29 16:32:33,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:32:33,804 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2021-08-29 16:32:33,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-08-29 16:32:33,805 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 21 states have (on average 2.142857142857143) internal successors, (45), 24 states have internal predecessors, (45), 12 states have call successors, (12), 1 states have call predecessors, (12), 9 states have return successors, (24), 8 states have call predecessors, (24), 12 states have call successors, (24) Word has length 52 [2021-08-29 16:32:33,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:32:33,806 INFO L225 Difference]: With dead ends: 40 [2021-08-29 16:32:33,806 INFO L226 Difference]: Without dead ends: 36 [2021-08-29 16:32:33,806 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 225 ImplicationChecksByTransitivity, 194.15ms TimeCoverageRelationStatistics Valid=306, Invalid=686, Unknown=0, NotChecked=0, Total=992 [2021-08-29 16:32:33,807 INFO L928 BasicCegarLoop]: 2 mSDtfsCounter, 170 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 72.06ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.69ms SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 92.82ms IncrementalHoareTripleChecker+Time [2021-08-29 16:32:33,807 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [180 Valid, 3 Invalid, 192 Unknown, 0 Unchecked, 2.69ms Time], IncrementalHoareTripleChecker [77 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 92.82ms Time] [2021-08-29 16:32:33,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-08-29 16:32:33,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-08-29 16:32:33,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 25 states have internal predecessors, (25), 2 states have call successors, (2), 1 states have call predecessors, (2), 9 states have return successors, (10), 9 states have call predecessors, (10), 2 states have call successors, (10) [2021-08-29 16:32:33,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2021-08-29 16:32:33,812 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 52 [2021-08-29 16:32:33,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:32:33,813 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2021-08-29 16:32:33,813 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 21 states have (on average 2.142857142857143) internal successors, (45), 24 states have internal predecessors, (45), 12 states have call successors, (12), 1 states have call predecessors, (12), 9 states have return successors, (24), 8 states have call predecessors, (24), 12 states have call successors, (24) [2021-08-29 16:32:33,813 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2021-08-29 16:32:33,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-08-29 16:32:33,814 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:32:33,814 INFO L513 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:32:33,841 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-08-29 16:32:34,015 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:34,015 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:32:34,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:32:34,015 INFO L82 PathProgramCache]: Analyzing trace with hash -960511412, now seen corresponding path program 5 times [2021-08-29 16:32:34,015 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:32:34,016 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1899750774] [2021-08-29 16:32:34,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:34,016 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:32:34,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:34,073 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:34,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:34,096 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:34,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:34,116 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:34,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:34,134 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:34,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:34,151 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:34,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:34,167 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:34,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:34,183 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:34,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:34,205 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:34,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:34,222 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-29 16:32:34,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-29 16:32:34,239 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-08-29 16:32:34,240 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-29 16:32:34,240 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1899750774] [2021-08-29 16:32:34,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1899750774] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-29 16:32:34,240 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [989884524] [2021-08-29 16:32:34,240 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-08-29 16:32:34,240 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:34,241 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-29 16:32:34,245 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-29 16:32:34,270 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-08-29 16:32:34,335 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2021-08-29 16:32:34,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-29 16:32:34,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 20 conjunts are in the unsatisfiable core [2021-08-29 16:32:34,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-29 16:32:34,667 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-08-29 16:32:34,667 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-29 16:32:36,731 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-08-29 16:32:36,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [989884524] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-29 16:32:36,731 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-08-29 16:32:36,731 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21, 21] total 46 [2021-08-29 16:32:36,732 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114293128] [2021-08-29 16:32:36,732 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-08-29 16:32:36,733 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-29 16:32:36,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-08-29 16:32:36,734 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=323, Invalid=1747, Unknown=0, NotChecked=0, Total=2070 [2021-08-29 16:32:36,734 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 46 states, 45 states have (on average 1.4) internal successors, (63), 30 states have internal predecessors, (63), 3 states have call successors, (4), 1 states have call predecessors, (4), 24 states have return successors, (25), 25 states have call predecessors, (25), 3 states have call successors, (25) [2021-08-29 16:32:37,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-29 16:32:37,282 INFO L93 Difference]: Finished difference Result 63 states and 70 transitions. [2021-08-29 16:32:37,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-08-29 16:32:37,283 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 1.4) internal successors, (63), 30 states have internal predecessors, (63), 3 states have call successors, (4), 1 states have call predecessors, (4), 24 states have return successors, (25), 25 states have call predecessors, (25), 3 states have call successors, (25) Word has length 58 [2021-08-29 16:32:37,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-29 16:32:37,284 INFO L225 Difference]: With dead ends: 63 [2021-08-29 16:32:37,284 INFO L226 Difference]: Without dead ends: 57 [2021-08-29 16:32:37,287 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 99 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1401 ImplicationChecksByTransitivity, 929.63ms TimeCoverageRelationStatistics Valid=920, Invalid=4932, Unknown=0, NotChecked=0, Total=5852 [2021-08-29 16:32:37,288 INFO L928 BasicCegarLoop]: 2 mSDtfsCounter, 21 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 102.61ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.30ms SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 123.27ms IncrementalHoareTripleChecker+Time [2021-08-29 16:32:37,288 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 13 Invalid, 246 Unknown, 0 Unchecked, 2.30ms Time], IncrementalHoareTripleChecker [19 Valid, 227 Invalid, 0 Unknown, 0 Unchecked, 123.27ms Time] [2021-08-29 16:32:37,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-08-29 16:32:37,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-08-29 16:32:37,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 38 states have (on average 1.0263157894736843) internal successors, (39), 39 states have internal predecessors, (39), 2 states have call successors, (2), 1 states have call predecessors, (2), 16 states have return successors, (17), 16 states have call predecessors, (17), 2 states have call successors, (17) [2021-08-29 16:32:37,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2021-08-29 16:32:37,295 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 58 [2021-08-29 16:32:37,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-29 16:32:37,295 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2021-08-29 16:32:37,296 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 1.4) internal successors, (63), 30 states have internal predecessors, (63), 3 states have call successors, (4), 1 states have call predecessors, (4), 24 states have return successors, (25), 25 states have call predecessors, (25), 3 states have call successors, (25) [2021-08-29 16:32:37,296 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2021-08-29 16:32:37,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-08-29 16:32:37,297 INFO L505 BasicCegarLoop]: Found error trace [2021-08-29 16:32:37,297 INFO L513 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-29 16:32:37,323 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-08-29 16:32:37,520 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-29 16:32:37,520 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-29 16:32:37,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-29 16:32:37,521 INFO L82 PathProgramCache]: Analyzing trace with hash 415287702, now seen corresponding path program 6 times [2021-08-29 16:32:37,521 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-29 16:32:37,521 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1668101800] [2021-08-29 16:32:37,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-29 16:32:37,521 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-29 16:32:37,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-29 16:32:37,552 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-29 16:32:37,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-29 16:32:37,604 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-29 16:32:37,605 INFO L627 BasicCegarLoop]: Counterexample is feasible [2021-08-29 16:32:37,605 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-08-29 16:32:37,607 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-08-29 16:32:37,611 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-08-29 16:32:37,652 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 29.08 04:32:37 BoogieIcfgContainer [2021-08-29 16:32:37,652 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-29 16:32:37,652 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-08-29 16:32:37,653 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-08-29 16:32:37,653 INFO L275 PluginConnector]: Witness Printer initialized [2021-08-29 16:32:37,653 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.08 04:32:27" (3/4) ... [2021-08-29 16:32:37,655 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-08-29 16:32:37,694 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-08-29 16:32:37,695 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-08-29 16:32:37,695 INFO L158 Benchmark]: Toolchain (without parser) took 10459.70ms. Allocated memory was 71.3MB in the beginning and 144.7MB in the end (delta: 73.4MB). Free memory was 53.8MB in the beginning and 105.3MB in the end (delta: -51.4MB). Peak memory consumption was 22.4MB. Max. memory is 16.1GB. [2021-08-29 16:32:37,696 INFO L158 Benchmark]: CDTParser took 0.71ms. Allocated memory is still 71.3MB. Free memory was 52.3MB in the beginning and 52.3MB in the end (delta: 32.2kB). There was no memory consumed. Max. memory is 16.1GB. [2021-08-29 16:32:37,696 INFO L158 Benchmark]: CACSL2BoogieTranslator took 159.79ms. Allocated memory is still 71.3MB. Free memory was 53.7MB in the beginning and 44.5MB in the end (delta: 9.2MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-08-29 16:32:37,696 INFO L158 Benchmark]: Boogie Procedure Inliner took 28.91ms. Allocated memory is still 71.3MB. Free memory was 44.5MB in the beginning and 43.2MB in the end (delta: 1.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-08-29 16:32:37,697 INFO L158 Benchmark]: Boogie Preprocessor took 41.73ms. Allocated memory is still 71.3MB. Free memory was 43.1MB in the beginning and 55.1MB in the end (delta: -12.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-08-29 16:32:37,697 INFO L158 Benchmark]: RCFGBuilder took 195.62ms. Allocated memory is still 71.3MB. Free memory was 55.1MB in the beginning and 46.5MB in the end (delta: 8.6MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-08-29 16:32:37,697 INFO L158 Benchmark]: TraceAbstraction took 9985.46ms. Allocated memory was 71.3MB in the beginning and 144.7MB in the end (delta: 73.4MB). Free memory was 46.0MB in the beginning and 109.4MB in the end (delta: -63.4MB). Peak memory consumption was 11.4MB. Max. memory is 16.1GB. [2021-08-29 16:32:37,698 INFO L158 Benchmark]: Witness Printer took 42.37ms. Allocated memory is still 144.7MB. Free memory was 109.4MB in the beginning and 105.3MB in the end (delta: 4.2MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2021-08-29 16:32:37,699 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.71ms. Allocated memory is still 71.3MB. Free memory was 52.3MB in the beginning and 52.3MB in the end (delta: 32.2kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 159.79ms. Allocated memory is still 71.3MB. Free memory was 53.7MB in the beginning and 44.5MB in the end (delta: 9.2MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 28.91ms. Allocated memory is still 71.3MB. Free memory was 44.5MB in the beginning and 43.2MB in the end (delta: 1.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 41.73ms. Allocated memory is still 71.3MB. Free memory was 43.1MB in the beginning and 55.1MB in the end (delta: -12.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 195.62ms. Allocated memory is still 71.3MB. Free memory was 55.1MB in the beginning and 46.5MB in the end (delta: 8.6MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * TraceAbstraction took 9985.46ms. Allocated memory was 71.3MB in the beginning and 144.7MB in the end (delta: 73.4MB). Free memory was 46.0MB in the beginning and 109.4MB in the end (delta: -63.4MB). Peak memory consumption was 11.4MB. Max. memory is 16.1GB. * Witness Printer took 42.37ms. Allocated memory is still 144.7MB. Free memory was 109.4MB in the beginning and 105.3MB in the end (delta: 4.2MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.00ms ErrorAutomatonConstructionTimeTotal, 0.00ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.00ms ErrorAutomatonConstructionTimeAvg, 0.00ms ErrorAutomatonDifferenceTimeAvg, 0.00ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 15]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L12] int input = 15; [L13] CALL, EXPR id(input) VAL [\old(x)=15] [L7] COND FALSE !(x==0) VAL [\old(x)=15, x=15] [L8] CALL, EXPR id(x-1) VAL [\old(x)=14] [L7] COND FALSE !(x==0) VAL [\old(x)=14, x=14] [L8] CALL, EXPR id(x-1) VAL [\old(x)=13] [L7] COND FALSE !(x==0) VAL [\old(x)=13, x=13] [L8] CALL, EXPR id(x-1) VAL [\old(x)=12] [L7] COND FALSE !(x==0) VAL [\old(x)=12, x=12] [L8] CALL, EXPR id(x-1) VAL [\old(x)=11] [L7] COND FALSE !(x==0) VAL [\old(x)=11, x=11] [L8] CALL, EXPR id(x-1) VAL [\old(x)=10] [L7] COND FALSE !(x==0) VAL [\old(x)=10, x=10] [L8] CALL, EXPR id(x-1) VAL [\old(x)=9] [L7] COND FALSE !(x==0) VAL [\old(x)=9, x=9] [L8] CALL, EXPR id(x-1) VAL [\old(x)=8] [L7] COND FALSE !(x==0) VAL [\old(x)=8, x=8] [L8] CALL, EXPR id(x-1) VAL [\old(x)=7] [L7] COND FALSE !(x==0) VAL [\old(x)=7, x=7] [L8] CALL, EXPR id(x-1) VAL [\old(x)=6] [L7] COND FALSE !(x==0) VAL [\old(x)=6, x=6] [L8] CALL, EXPR id(x-1) VAL [\old(x)=5] [L7] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L8] CALL, EXPR id(x-1) VAL [\old(x)=4] [L7] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L8] CALL, EXPR id(x-1) VAL [\old(x)=3] [L7] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L8] CALL, EXPR id(x-1) VAL [\old(x)=2] [L7] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L8] CALL, EXPR id(x-1) VAL [\old(x)=1] [L7] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L8] CALL, EXPR id(x-1) VAL [\old(x)=0] [L7] COND TRUE x==0 [L7] return 0; VAL [\old(x)=0, \result=0, x=0] [L8] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=6, id(x-1)=5, x=6] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=7, id(x-1)=6, x=7] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=8, id(x-1)=7, x=8] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=9, id(x-1)=8, x=9] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=10, id(x-1)=9, x=10] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=11, id(x-1)=10, x=11] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=12, id(x-1)=11, x=12] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=13, id(x-1)=12, x=13] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=14, id(x-1)=13, x=14] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=15, id(x-1)=14, x=15] [L8] return id(x-1) + 1; [L13] RET, EXPR id(input) [L13] int result = id(input); [L14] COND TRUE result == 15 [L15] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 16 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 9885.32ms, OverallIterations: 7, TraceHistogramMax: 16, EmptinessCheckTime: 20.58ms, AutomataDifference: 1321.25ms, DeadEndRemovalTime: 0.00ms, HoareAnnotationTime: 0.00ms, InitialAbstractionConstructionTime: 11.01ms, PartialOrderReductionTime: 0.00ms, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 330 SdHoareTripleChecker+Valid, 480.05ms IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 273 mSDsluCounter, 38 SdHoareTripleChecker+Invalid, 381.56ms Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 328 mSDsCounter, 129 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 708 IncrementalHoareTripleChecker+Invalid, 837 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 129 mSolverCounterUnsat, 12 mSDtfsCounter, 708 mSolverCounterSat, 12.75ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 501 GetRequests, 325 SyntacticMatches, 1 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1998 ImplicationChecksByTransitivity, 1739.63ms Time, 0.00ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=57occurred in iteration=6, InterpolantAutomatonStates: 84, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.00ms DumpTime, AutomataMinimizationStatistics: 59.26ms AutomataMinimizationTime, 6 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 51.48ms SsaConstructionTime, 228.12ms SatisfiabilityAnalysisTime, 6719.91ms InterpolantComputationTime, 462 NumberOfCodeBlocks, 462 NumberOfCodeBlocksAsserted, 25 NumberOfCheckSat, 522 ConstructedInterpolants, 0 QuantifiedInterpolants, 1284 SizeOfPredicates, 13 NumberOfNonLiveVariables, 559 ConjunctsInSsa, 62 ConjunctsInUnsatCore, 16 InterpolantComputations, 1 PerfectInterpolantSequences, 549/1206 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-08-29 16:32:37,738 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...