./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/goblint-regression/28-race_reach_11-ptr_racing.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6c24879c 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/goblint-regression/28-race_reach_11-ptr_racing.i -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 265daba2b5ad7b4578f16c23ab641f7a5441c3a3894a2482737cba7b750ee6df --- Real Ultimate output --- This is Ultimate 0.2.2-?-6c24879 [2022-07-12 10:16:09,624 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-12 10:16:09,629 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-12 10:16:09,661 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-12 10:16:09,671 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-12 10:16:09,672 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-12 10:16:09,674 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-12 10:16:09,677 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-12 10:16:09,679 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-12 10:16:09,681 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-12 10:16:09,682 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-12 10:16:09,684 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-12 10:16:09,684 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-12 10:16:09,687 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-12 10:16:09,689 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-12 10:16:09,690 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-12 10:16:09,692 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-12 10:16:09,692 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-12 10:16:09,694 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-12 10:16:09,700 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-12 10:16:09,702 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-12 10:16:09,704 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-12 10:16:09,704 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-12 10:16:09,705 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-12 10:16:09,706 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-12 10:16:09,708 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-12 10:16:09,710 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-12 10:16:09,711 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-12 10:16:09,712 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-12 10:16:09,712 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-12 10:16:09,713 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-12 10:16:09,714 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-12 10:16:09,715 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-12 10:16:09,715 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-12 10:16:09,716 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-12 10:16:09,717 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-12 10:16:09,717 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-12 10:16:09,717 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-12 10:16:09,718 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-12 10:16:09,718 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-12 10:16:09,718 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-12 10:16:09,720 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-12 10:16:09,721 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2022-07-12 10:16:09,744 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-12 10:16:09,746 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-12 10:16:09,746 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-12 10:16:09,746 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-12 10:16:09,747 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-12 10:16:09,747 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-12 10:16:09,748 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-12 10:16:09,748 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-12 10:16:09,748 INFO L138 SettingsManager]: * Use SBE=true [2022-07-12 10:16:09,749 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-12 10:16:09,749 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-12 10:16:09,749 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-12 10:16:09,749 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-12 10:16:09,749 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-12 10:16:09,749 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-07-12 10:16:09,749 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-12 10:16:09,750 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-07-12 10:16:09,750 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-12 10:16:09,750 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-07-12 10:16:09,750 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-12 10:16:09,750 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-07-12 10:16:09,750 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-12 10:16:09,751 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-12 10:16:09,752 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-12 10:16:09,752 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-12 10:16:09,752 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-12 10:16:09,752 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-12 10:16:09,752 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-07-12 10:16:09,752 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-07-12 10:16:09,753 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-07-12 10:16:09,753 INFO L138 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2022-07-12 10:16:09,753 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-07-12 10:16:09,753 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-07-12 10:16:09,753 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 265daba2b5ad7b4578f16c23ab641f7a5441c3a3894a2482737cba7b750ee6df [2022-07-12 10:16:09,955 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-12 10:16:09,979 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-12 10:16:09,981 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-12 10:16:09,982 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-12 10:16:09,982 INFO L275 PluginConnector]: CDTParser initialized [2022-07-12 10:16:09,983 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/goblint-regression/28-race_reach_11-ptr_racing.i [2022-07-12 10:16:10,027 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf1cadaac/63c4518f5208405ca316c5a7e18bf9b3/FLAG5c72ae95e [2022-07-12 10:16:10,409 INFO L306 CDTParser]: Found 1 translation units. [2022-07-12 10:16:10,409 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/goblint-regression/28-race_reach_11-ptr_racing.i [2022-07-12 10:16:10,422 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf1cadaac/63c4518f5208405ca316c5a7e18bf9b3/FLAG5c72ae95e [2022-07-12 10:16:10,437 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf1cadaac/63c4518f5208405ca316c5a7e18bf9b3 [2022-07-12 10:16:10,439 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-12 10:16:10,439 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-12 10:16:10,440 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-12 10:16:10,440 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-12 10:16:10,445 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-12 10:16:10,445 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.07 10:16:10" (1/1) ... [2022-07-12 10:16:10,446 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@128cdd52 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 10:16:10, skipping insertion in model container [2022-07-12 10:16:10,446 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.07 10:16:10" (1/1) ... [2022-07-12 10:16:10,450 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-12 10:16:10,477 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-12 10:16:10,697 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/goblint-regression/28-race_reach_11-ptr_racing.i[30176,30189] [2022-07-12 10:16:10,708 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-12 10:16:10,721 INFO L203 MainTranslator]: Completed pre-run [2022-07-12 10:16:10,757 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/goblint-regression/28-race_reach_11-ptr_racing.i[30176,30189] [2022-07-12 10:16:10,762 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-12 10:16:10,789 INFO L208 MainTranslator]: Completed translation [2022-07-12 10:16:10,789 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 10:16:10 WrapperNode [2022-07-12 10:16:10,789 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-12 10:16:10,790 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-07-12 10:16:10,790 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-07-12 10:16:10,790 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-07-12 10:16:10,795 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 10:16:10" (1/1) ... [2022-07-12 10:16:10,819 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 10:16:10" (1/1) ... [2022-07-12 10:16:10,841 INFO L137 Inliner]: procedures = 170, calls = 43, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 83 [2022-07-12 10:16:10,841 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-07-12 10:16:10,842 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-07-12 10:16:10,843 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-07-12 10:16:10,843 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-07-12 10:16:10,847 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 10:16:10" (1/1) ... [2022-07-12 10:16:10,848 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 10:16:10" (1/1) ... [2022-07-12 10:16:10,855 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 10:16:10" (1/1) ... [2022-07-12 10:16:10,855 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 10:16:10" (1/1) ... [2022-07-12 10:16:10,863 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 10:16:10" (1/1) ... [2022-07-12 10:16:10,865 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 10:16:10" (1/1) ... [2022-07-12 10:16:10,866 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 10:16:10" (1/1) ... [2022-07-12 10:16:10,868 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-07-12 10:16:10,869 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-07-12 10:16:10,869 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-07-12 10:16:10,869 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-07-12 10:16:10,870 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 10:16:10" (1/1) ... [2022-07-12 10:16:10,874 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-12 10:16:10,883 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 10:16:10,934 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-07-12 10:16:10,935 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-07-12 10:16:10,961 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-07-12 10:16:10,961 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-07-12 10:16:10,961 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2022-07-12 10:16:10,961 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-07-12 10:16:10,961 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-07-12 10:16:10,962 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2022-07-12 10:16:10,962 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2022-07-12 10:16:10,962 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-07-12 10:16:10,962 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-07-12 10:16:10,962 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-07-12 10:16:10,962 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-07-12 10:16:10,963 WARN L208 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2022-07-12 10:16:11,062 INFO L234 CfgBuilder]: Building ICFG [2022-07-12 10:16:11,064 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-07-12 10:16:11,219 INFO L275 CfgBuilder]: Performing block encoding [2022-07-12 10:16:11,225 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-07-12 10:16:11,225 INFO L299 CfgBuilder]: Removed 10 assume(true) statements. [2022-07-12 10:16:11,227 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.07 10:16:11 BoogieIcfgContainer [2022-07-12 10:16:11,227 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-07-12 10:16:11,228 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-07-12 10:16:11,228 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-07-12 10:16:11,230 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-07-12 10:16:11,231 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.07 10:16:10" (1/3) ... [2022-07-12 10:16:11,231 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77ea6cb5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.07 10:16:11, skipping insertion in model container [2022-07-12 10:16:11,232 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 10:16:10" (2/3) ... [2022-07-12 10:16:11,232 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77ea6cb5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.07 10:16:11, skipping insertion in model container [2022-07-12 10:16:11,233 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.07 10:16:11" (3/3) ... [2022-07-12 10:16:11,233 INFO L111 eAbstractionObserver]: Analyzing ICFG 28-race_reach_11-ptr_racing.i [2022-07-12 10:16:11,237 WARN L143 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2022-07-12 10:16:11,243 INFO L201 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-07-12 10:16:11,244 INFO L160 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-07-12 10:16:11,244 INFO L509 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2022-07-12 10:16:11,336 INFO L135 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2022-07-12 10:16:11,363 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 112 places, 121 transitions, 250 flow [2022-07-12 10:16:11,407 INFO L129 PetriNetUnfolder]: 17/159 cut-off events. [2022-07-12 10:16:11,407 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2022-07-12 10:16:11,412 INFO L84 FinitePrefix]: Finished finitePrefix Result has 165 conditions, 159 events. 17/159 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 383 event pairs, 0 based on Foata normal form. 0/137 useless extension candidates. Maximal degree in co-relation 76. Up to 4 conditions per place. [2022-07-12 10:16:11,413 INFO L82 GeneralOperation]: Start removeDead. Operand has 112 places, 121 transitions, 250 flow [2022-07-12 10:16:11,418 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 108 places, 116 transitions, 237 flow [2022-07-12 10:16:11,424 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-12 10:16:11,429 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@2db21756, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@16dd23c4 [2022-07-12 10:16:11,429 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-07-12 10:16:11,443 INFO L129 PetriNetUnfolder]: 4/87 cut-off events. [2022-07-12 10:16:11,446 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2022-07-12 10:16:11,446 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:11,447 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:11,447 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:11,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:11,454 INFO L85 PathProgramCache]: Analyzing trace with hash 1862898711, now seen corresponding path program 1 times [2022-07-12 10:16:11,460 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:11,461 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [369380174] [2022-07-12 10:16:11,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:11,462 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:11,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:11,638 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:11,639 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:11,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [369380174] [2022-07-12 10:16:11,639 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [369380174] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 10:16:11,640 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 10:16:11,640 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-12 10:16:11,641 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365717824] [2022-07-12 10:16:11,641 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 10:16:11,646 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-07-12 10:16:11,646 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:11,668 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-07-12 10:16:11,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-07-12 10:16:11,671 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 107 out of 121 [2022-07-12 10:16:11,673 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 108 places, 116 transitions, 237 flow. Second operand has 2 states, 2 states have (on average 107.5) internal successors, (215), 2 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:11,673 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:11,673 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 107 of 121 [2022-07-12 10:16:11,674 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:11,701 INFO L129 PetriNetUnfolder]: 0/136 cut-off events. [2022-07-12 10:16:11,701 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2022-07-12 10:16:11,701 INFO L84 FinitePrefix]: Finished finitePrefix Result has 143 conditions, 136 events. 0/136 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 213 event pairs, 0 based on Foata normal form. 16/146 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2022-07-12 10:16:11,702 INFO L132 encePairwiseOnDemand]: 110/121 looper letters, 1 selfloop transitions, 0 changer transitions 16/104 dead transitions. [2022-07-12 10:16:11,702 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 108 places, 104 transitions, 215 flow [2022-07-12 10:16:11,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-07-12 10:16:11,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2022-07-12 10:16:11,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 226 transitions. [2022-07-12 10:16:11,711 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.9338842975206612 [2022-07-12 10:16:11,711 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 226 transitions. [2022-07-12 10:16:11,712 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 226 transitions. [2022-07-12 10:16:11,713 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:11,714 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 226 transitions. [2022-07-12 10:16:11,716 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 113.0) internal successors, (226), 2 states have internal predecessors, (226), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:11,719 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 121.0) internal successors, (363), 3 states have internal predecessors, (363), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:11,719 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 121.0) internal successors, (363), 3 states have internal predecessors, (363), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:11,721 INFO L186 Difference]: Start difference. First operand has 108 places, 116 transitions, 237 flow. Second operand 2 states and 226 transitions. [2022-07-12 10:16:11,721 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 108 places, 104 transitions, 215 flow [2022-07-12 10:16:11,739 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 108 places, 104 transitions, 215 flow, removed 0 selfloop flow, removed 0 redundant places. [2022-07-12 10:16:11,741 INFO L242 Difference]: Finished difference. Result has 108 places, 88 transitions, 181 flow [2022-07-12 10:16:11,746 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=121, PETRI_DIFFERENCE_MINUEND_FLOW=213, PETRI_DIFFERENCE_MINUEND_PLACES=107, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=104, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=104, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=181, PETRI_PLACES=108, PETRI_TRANSITIONS=88} [2022-07-12 10:16:11,748 INFO L279 CegarLoopForPetriNet]: 108 programPoint places, 0 predicate places. [2022-07-12 10:16:11,749 INFO L495 AbstractCegarLoop]: Abstraction has has 108 places, 88 transitions, 181 flow [2022-07-12 10:16:11,749 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 107.5) internal successors, (215), 2 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:11,749 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:11,749 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:11,750 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-07-12 10:16:11,750 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:11,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:11,750 INFO L85 PathProgramCache]: Analyzing trace with hash 1991981430, now seen corresponding path program 1 times [2022-07-12 10:16:11,751 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:11,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977341875] [2022-07-12 10:16:11,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:11,751 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:11,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:11,822 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:11,822 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:11,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [977341875] [2022-07-12 10:16:11,822 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [977341875] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 10:16:11,823 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 10:16:11,823 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-12 10:16:11,823 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613659785] [2022-07-12 10:16:11,823 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 10:16:11,824 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-12 10:16:11,824 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:11,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-12 10:16:11,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-12 10:16:11,826 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 100 out of 121 [2022-07-12 10:16:11,827 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 108 places, 88 transitions, 181 flow. Second operand has 3 states, 3 states have (on average 101.0) internal successors, (303), 3 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:11,827 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:11,827 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 100 of 121 [2022-07-12 10:16:11,827 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:11,851 INFO L129 PetriNetUnfolder]: 0/92 cut-off events. [2022-07-12 10:16:11,853 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2022-07-12 10:16:11,854 INFO L84 FinitePrefix]: Finished finitePrefix Result has 109 conditions, 92 events. 0/92 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 52 event pairs, 0 based on Foata normal form. 0/91 useless extension candidates. Maximal degree in co-relation 0. Up to 6 conditions per place. [2022-07-12 10:16:11,855 INFO L132 encePairwiseOnDemand]: 118/121 looper letters, 8 selfloop transitions, 2 changer transitions 0/90 dead transitions. [2022-07-12 10:16:11,856 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 94 places, 90 transitions, 205 flow [2022-07-12 10:16:11,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-12 10:16:11,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2022-07-12 10:16:11,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 311 transitions. [2022-07-12 10:16:11,860 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.8567493112947658 [2022-07-12 10:16:11,861 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 311 transitions. [2022-07-12 10:16:11,861 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 311 transitions. [2022-07-12 10:16:11,862 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:11,863 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 311 transitions. [2022-07-12 10:16:11,864 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 103.66666666666667) internal successors, (311), 3 states have internal predecessors, (311), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:11,866 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 121.0) internal successors, (484), 4 states have internal predecessors, (484), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:11,866 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 121.0) internal successors, (484), 4 states have internal predecessors, (484), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:11,866 INFO L186 Difference]: Start difference. First operand has 108 places, 88 transitions, 181 flow. Second operand 3 states and 311 transitions. [2022-07-12 10:16:11,867 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 94 places, 90 transitions, 205 flow [2022-07-12 10:16:11,867 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 94 places, 90 transitions, 205 flow, removed 0 selfloop flow, removed 0 redundant places. [2022-07-12 10:16:11,869 INFO L242 Difference]: Finished difference. Result has 95 places, 88 transitions, 189 flow [2022-07-12 10:16:11,869 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=121, PETRI_DIFFERENCE_MINUEND_FLOW=181, PETRI_DIFFERENCE_MINUEND_PLACES=92, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=88, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=86, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=189, PETRI_PLACES=95, PETRI_TRANSITIONS=88} [2022-07-12 10:16:11,870 INFO L279 CegarLoopForPetriNet]: 108 programPoint places, -13 predicate places. [2022-07-12 10:16:11,870 INFO L495 AbstractCegarLoop]: Abstraction has has 95 places, 88 transitions, 189 flow [2022-07-12 10:16:11,870 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 101.0) internal successors, (303), 3 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:11,870 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:11,871 INFO L200 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:11,871 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-07-12 10:16:11,871 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:11,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:11,872 INFO L85 PathProgramCache]: Analyzing trace with hash 153951839, now seen corresponding path program 1 times [2022-07-12 10:16:11,872 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:11,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [465926061] [2022-07-12 10:16:11,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:11,872 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:11,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-12 10:16:11,916 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-07-12 10:16:11,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-12 10:16:11,986 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-07-12 10:16:11,987 INFO L271 BasicCegarLoop]: Counterexample is feasible [2022-07-12 10:16:11,989 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (1 of 2 remaining) [2022-07-12 10:16:11,990 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 2 remaining) [2022-07-12 10:16:11,990 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-07-12 10:16:11,990 INFO L356 BasicCegarLoop]: Path program histogram: [1, 1, 1] [2022-07-12 10:16:11,992 WARN L231 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2022-07-12 10:16:11,992 INFO L509 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2022-07-12 10:16:12,006 INFO L135 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2022-07-12 10:16:12,011 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 142 places, 156 transitions, 330 flow [2022-07-12 10:16:12,048 INFO L129 PetriNetUnfolder]: 31/257 cut-off events. [2022-07-12 10:16:12,049 INFO L130 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2022-07-12 10:16:12,052 INFO L84 FinitePrefix]: Finished finitePrefix Result has 271 conditions, 257 events. 31/257 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 786 event pairs, 0 based on Foata normal form. 0/219 useless extension candidates. Maximal degree in co-relation 161. Up to 8 conditions per place. [2022-07-12 10:16:12,052 INFO L82 GeneralOperation]: Start removeDead. Operand has 142 places, 156 transitions, 330 flow [2022-07-12 10:16:12,054 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 142 places, 156 transitions, 330 flow [2022-07-12 10:16:12,057 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-12 10:16:12,061 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@2db21756, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@16dd23c4 [2022-07-12 10:16:12,061 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-07-12 10:16:12,076 INFO L129 PetriNetUnfolder]: 3/84 cut-off events. [2022-07-12 10:16:12,077 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2022-07-12 10:16:12,077 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:12,077 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:12,077 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:12,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:12,078 INFO L85 PathProgramCache]: Analyzing trace with hash 1742535575, now seen corresponding path program 1 times [2022-07-12 10:16:12,078 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:12,078 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1830949417] [2022-07-12 10:16:12,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:12,078 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:12,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:12,137 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:12,137 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:12,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1830949417] [2022-07-12 10:16:12,138 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1830949417] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 10:16:12,139 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 10:16:12,139 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-12 10:16:12,139 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308881649] [2022-07-12 10:16:12,139 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 10:16:12,140 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-07-12 10:16:12,140 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:12,141 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-07-12 10:16:12,141 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-07-12 10:16:12,144 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 134 out of 156 [2022-07-12 10:16:12,144 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 142 places, 156 transitions, 330 flow. Second operand has 2 states, 2 states have (on average 134.5) internal successors, (269), 2 states have internal predecessors, (269), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:12,145 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:12,145 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 134 of 156 [2022-07-12 10:16:12,145 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:12,181 INFO L129 PetriNetUnfolder]: 3/226 cut-off events. [2022-07-12 10:16:12,181 INFO L130 PetriNetUnfolder]: For 21/27 co-relation queries the response was YES. [2022-07-12 10:16:12,181 INFO L84 FinitePrefix]: Finished finitePrefix Result has 247 conditions, 226 events. 3/226 cut-off events. For 21/27 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 576 event pairs, 0 based on Foata normal form. 42/258 useless extension candidates. Maximal degree in co-relation 145. Up to 7 conditions per place. [2022-07-12 10:16:12,182 INFO L132 encePairwiseOnDemand]: 139/156 looper letters, 2 selfloop transitions, 0 changer transitions 22/138 dead transitions. [2022-07-12 10:16:12,182 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 142 places, 138 transitions, 302 flow [2022-07-12 10:16:12,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-07-12 10:16:12,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2022-07-12 10:16:12,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 289 transitions. [2022-07-12 10:16:12,184 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.9262820512820513 [2022-07-12 10:16:12,184 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 289 transitions. [2022-07-12 10:16:12,184 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 289 transitions. [2022-07-12 10:16:12,184 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:12,184 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 289 transitions. [2022-07-12 10:16:12,185 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 144.5) internal successors, (289), 2 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:12,186 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 156.0) internal successors, (468), 3 states have internal predecessors, (468), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:12,186 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 156.0) internal successors, (468), 3 states have internal predecessors, (468), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:12,186 INFO L186 Difference]: Start difference. First operand has 142 places, 156 transitions, 330 flow. Second operand 2 states and 289 transitions. [2022-07-12 10:16:12,187 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 142 places, 138 transitions, 302 flow [2022-07-12 10:16:12,188 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 142 places, 138 transitions, 302 flow, removed 0 selfloop flow, removed 0 redundant places. [2022-07-12 10:16:12,189 INFO L242 Difference]: Finished difference. Result has 142 places, 116 transitions, 244 flow [2022-07-12 10:16:12,189 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=156, PETRI_DIFFERENCE_MINUEND_FLOW=294, PETRI_DIFFERENCE_MINUEND_PLACES=141, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=138, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=138, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=244, PETRI_PLACES=142, PETRI_TRANSITIONS=116} [2022-07-12 10:16:12,190 INFO L279 CegarLoopForPetriNet]: 142 programPoint places, 0 predicate places. [2022-07-12 10:16:12,190 INFO L495 AbstractCegarLoop]: Abstraction has has 142 places, 116 transitions, 244 flow [2022-07-12 10:16:12,190 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 134.5) internal successors, (269), 2 states have internal predecessors, (269), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:12,191 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:12,191 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:12,191 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-07-12 10:16:12,191 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:12,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:12,192 INFO L85 PathProgramCache]: Analyzing trace with hash 1871618294, now seen corresponding path program 1 times [2022-07-12 10:16:12,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:12,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [12787989] [2022-07-12 10:16:12,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:12,192 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:12,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:12,220 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:12,221 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:12,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [12787989] [2022-07-12 10:16:12,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [12787989] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 10:16:12,221 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 10:16:12,222 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-12 10:16:12,222 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143390232] [2022-07-12 10:16:12,222 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 10:16:12,222 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-12 10:16:12,223 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:12,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-12 10:16:12,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-12 10:16:12,224 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 127 out of 156 [2022-07-12 10:16:12,225 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 142 places, 116 transitions, 244 flow. Second operand has 3 states, 3 states have (on average 128.0) internal successors, (384), 3 states have internal predecessors, (384), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:12,225 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:12,225 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 127 of 156 [2022-07-12 10:16:12,225 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:12,260 INFO L129 PetriNetUnfolder]: 0/141 cut-off events. [2022-07-12 10:16:12,260 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2022-07-12 10:16:12,260 INFO L84 FinitePrefix]: Finished finitePrefix Result has 169 conditions, 141 events. 0/141 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 214 event pairs, 0 based on Foata normal form. 0/139 useless extension candidates. Maximal degree in co-relation 0. Up to 12 conditions per place. [2022-07-12 10:16:12,261 INFO L132 encePairwiseOnDemand]: 153/156 looper letters, 11 selfloop transitions, 2 changer transitions 0/120 dead transitions. [2022-07-12 10:16:12,261 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 124 places, 120 transitions, 278 flow [2022-07-12 10:16:12,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-12 10:16:12,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2022-07-12 10:16:12,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 395 transitions. [2022-07-12 10:16:12,262 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.844017094017094 [2022-07-12 10:16:12,263 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 395 transitions. [2022-07-12 10:16:12,263 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 395 transitions. [2022-07-12 10:16:12,263 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:12,263 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 395 transitions. [2022-07-12 10:16:12,264 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 131.66666666666666) internal successors, (395), 3 states have internal predecessors, (395), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:12,265 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 156.0) internal successors, (624), 4 states have internal predecessors, (624), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:12,266 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 156.0) internal successors, (624), 4 states have internal predecessors, (624), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:12,266 INFO L186 Difference]: Start difference. First operand has 142 places, 116 transitions, 244 flow. Second operand 3 states and 395 transitions. [2022-07-12 10:16:12,266 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 124 places, 120 transitions, 278 flow [2022-07-12 10:16:12,271 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 124 places, 120 transitions, 276 flow, removed 1 selfloop flow, removed 0 redundant places. [2022-07-12 10:16:12,272 INFO L242 Difference]: Finished difference. Result has 125 places, 117 transitions, 254 flow [2022-07-12 10:16:12,272 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=156, PETRI_DIFFERENCE_MINUEND_FLOW=242, PETRI_DIFFERENCE_MINUEND_PLACES=122, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=116, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=114, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=254, PETRI_PLACES=125, PETRI_TRANSITIONS=117} [2022-07-12 10:16:12,274 INFO L279 CegarLoopForPetriNet]: 142 programPoint places, -17 predicate places. [2022-07-12 10:16:12,274 INFO L495 AbstractCegarLoop]: Abstraction has has 125 places, 117 transitions, 254 flow [2022-07-12 10:16:12,275 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 128.0) internal successors, (384), 3 states have internal predecessors, (384), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:12,275 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:12,275 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:12,275 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-07-12 10:16:12,276 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:12,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:12,276 INFO L85 PathProgramCache]: Analyzing trace with hash -1728322615, now seen corresponding path program 1 times [2022-07-12 10:16:12,276 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:12,276 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [468551158] [2022-07-12 10:16:12,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:12,277 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:12,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:12,357 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:12,358 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:12,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [468551158] [2022-07-12 10:16:12,369 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [468551158] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 10:16:12,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1607154538] [2022-07-12 10:16:12,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:12,371 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:12,371 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 10:16:12,372 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 10:16:12,373 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-07-12 10:16:12,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:12,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 4 conjunts are in the unsatisfiable core [2022-07-12 10:16:12,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 10:16:12,543 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:12,544 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 10:16:12,609 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:12,609 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1607154538] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 10:16:12,610 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 10:16:12,610 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2022-07-12 10:16:12,610 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835353014] [2022-07-12 10:16:12,610 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 10:16:12,611 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-12 10:16:12,611 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:12,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-12 10:16:12,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-07-12 10:16:12,613 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 126 out of 156 [2022-07-12 10:16:12,614 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 125 places, 117 transitions, 254 flow. Second operand has 10 states, 10 states have (on average 128.3) internal successors, (1283), 10 states have internal predecessors, (1283), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:12,614 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:12,614 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 126 of 156 [2022-07-12 10:16:12,614 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:12,682 INFO L129 PetriNetUnfolder]: 0/117 cut-off events. [2022-07-12 10:16:12,682 INFO L130 PetriNetUnfolder]: For 4/4 co-relation queries the response was YES. [2022-07-12 10:16:12,683 INFO L84 FinitePrefix]: Finished finitePrefix Result has 150 conditions, 117 events. 0/117 cut-off events. For 4/4 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 93 event pairs, 0 based on Foata normal form. 2/119 useless extension candidates. Maximal degree in co-relation 0. Up to 4 conditions per place. [2022-07-12 10:16:12,683 INFO L132 encePairwiseOnDemand]: 151/156 looper letters, 9 selfloop transitions, 7 changer transitions 0/111 dead transitions. [2022-07-12 10:16:12,683 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 121 places, 111 transitions, 272 flow [2022-07-12 10:16:12,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-12 10:16:12,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2022-07-12 10:16:12,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 1152 transitions. [2022-07-12 10:16:12,686 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.8205128205128205 [2022-07-12 10:16:12,686 INFO L72 ComplementDD]: Start complementDD. Operand 9 states and 1152 transitions. [2022-07-12 10:16:12,686 INFO L73 IsDeterministic]: Start isDeterministic. Operand 9 states and 1152 transitions. [2022-07-12 10:16:12,687 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:12,687 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 9 states and 1152 transitions. [2022-07-12 10:16:12,689 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 10 states, 9 states have (on average 128.0) internal successors, (1152), 9 states have internal predecessors, (1152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:12,691 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 10 states, 10 states have (on average 156.0) internal successors, (1560), 10 states have internal predecessors, (1560), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:12,692 INFO L81 ComplementDD]: Finished complementDD. Result has 10 states, 10 states have (on average 156.0) internal successors, (1560), 10 states have internal predecessors, (1560), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:12,692 INFO L186 Difference]: Start difference. First operand has 125 places, 117 transitions, 254 flow. Second operand 9 states and 1152 transitions. [2022-07-12 10:16:12,692 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 121 places, 111 transitions, 272 flow [2022-07-12 10:16:12,694 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 120 places, 111 transitions, 270 flow, removed 0 selfloop flow, removed 1 redundant places. [2022-07-12 10:16:12,698 INFO L242 Difference]: Finished difference. Result has 120 places, 107 transitions, 244 flow [2022-07-12 10:16:12,698 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=156, PETRI_DIFFERENCE_MINUEND_FLOW=226, PETRI_DIFFERENCE_MINUEND_PLACES=112, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=105, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=100, PETRI_DIFFERENCE_SUBTRAHEND_STATES=9, PETRI_FLOW=244, PETRI_PLACES=120, PETRI_TRANSITIONS=107} [2022-07-12 10:16:12,701 INFO L279 CegarLoopForPetriNet]: 142 programPoint places, -22 predicate places. [2022-07-12 10:16:12,701 INFO L495 AbstractCegarLoop]: Abstraction has has 120 places, 107 transitions, 244 flow [2022-07-12 10:16:12,702 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 128.3) internal successors, (1283), 10 states have internal predecessors, (1283), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:12,702 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:12,702 INFO L200 CegarLoopForPetriNet]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:12,722 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-07-12 10:16:12,915 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-07-12 10:16:12,916 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:12,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:12,916 INFO L85 PathProgramCache]: Analyzing trace with hash -759428597, now seen corresponding path program 1 times [2022-07-12 10:16:12,916 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:12,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [396950871] [2022-07-12 10:16:12,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:12,916 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:12,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-12 10:16:12,930 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-07-12 10:16:12,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-12 10:16:12,944 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-07-12 10:16:12,945 INFO L271 BasicCegarLoop]: Counterexample is feasible [2022-07-12 10:16:12,945 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (1 of 2 remaining) [2022-07-12 10:16:12,945 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 2 remaining) [2022-07-12 10:16:12,945 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-07-12 10:16:12,945 INFO L356 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2022-07-12 10:16:12,946 WARN L231 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2022-07-12 10:16:12,946 INFO L509 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2022-07-12 10:16:12,961 INFO L135 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2022-07-12 10:16:12,962 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 172 places, 191 transitions, 412 flow [2022-07-12 10:16:12,989 INFO L129 PetriNetUnfolder]: 50/388 cut-off events. [2022-07-12 10:16:12,989 INFO L130 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2022-07-12 10:16:12,992 INFO L84 FinitePrefix]: Finished finitePrefix Result has 416 conditions, 388 events. 50/388 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1326 event pairs, 1 based on Foata normal form. 0/330 useless extension candidates. Maximal degree in co-relation 265. Up to 16 conditions per place. [2022-07-12 10:16:12,992 INFO L82 GeneralOperation]: Start removeDead. Operand has 172 places, 191 transitions, 412 flow [2022-07-12 10:16:12,994 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 172 places, 191 transitions, 412 flow [2022-07-12 10:16:12,995 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-12 10:16:12,995 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@2db21756, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@16dd23c4 [2022-07-12 10:16:12,996 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-07-12 10:16:13,000 INFO L129 PetriNetUnfolder]: 6/94 cut-off events. [2022-07-12 10:16:13,000 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2022-07-12 10:16:13,000 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:13,000 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:13,001 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:13,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:13,001 INFO L85 PathProgramCache]: Analyzing trace with hash 209999318, now seen corresponding path program 1 times [2022-07-12 10:16:13,001 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:13,001 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [401605021] [2022-07-12 10:16:13,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:13,002 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:13,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:13,028 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:13,030 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:13,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [401605021] [2022-07-12 10:16:13,031 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [401605021] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 10:16:13,031 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 10:16:13,031 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-12 10:16:13,031 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [927129272] [2022-07-12 10:16:13,031 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 10:16:13,032 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-12 10:16:13,032 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:13,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-12 10:16:13,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-12 10:16:13,033 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 154 out of 191 [2022-07-12 10:16:13,034 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 172 places, 191 transitions, 412 flow. Second operand has 3 states, 3 states have (on average 155.0) internal successors, (465), 3 states have internal predecessors, (465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:13,034 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:13,034 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 154 of 191 [2022-07-12 10:16:13,034 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:13,093 INFO L129 PetriNetUnfolder]: 7/323 cut-off events. [2022-07-12 10:16:13,093 INFO L130 PetriNetUnfolder]: For 61/125 co-relation queries the response was YES. [2022-07-12 10:16:13,094 INFO L84 FinitePrefix]: Finished finitePrefix Result has 386 conditions, 323 events. 7/323 cut-off events. For 61/125 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 975 event pairs, 1 based on Foata normal form. 185/494 useless extension candidates. Maximal degree in co-relation 235. Up to 30 conditions per place. [2022-07-12 10:16:13,095 INFO L132 encePairwiseOnDemand]: 165/191 looper letters, 12 selfloop transitions, 2 changer transitions 23/171 dead transitions. [2022-07-12 10:16:13,095 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 173 places, 171 transitions, 406 flow [2022-07-12 10:16:13,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-12 10:16:13,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2022-07-12 10:16:13,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 510 transitions. [2022-07-12 10:16:13,097 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.8900523560209425 [2022-07-12 10:16:13,097 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 510 transitions. [2022-07-12 10:16:13,097 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 510 transitions. [2022-07-12 10:16:13,097 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:13,097 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 510 transitions. [2022-07-12 10:16:13,100 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 170.0) internal successors, (510), 3 states have internal predecessors, (510), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:13,101 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 191.0) internal successors, (764), 4 states have internal predecessors, (764), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:13,103 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 191.0) internal successors, (764), 4 states have internal predecessors, (764), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:13,103 INFO L186 Difference]: Start difference. First operand has 172 places, 191 transitions, 412 flow. Second operand 3 states and 510 transitions. [2022-07-12 10:16:13,103 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 173 places, 171 transitions, 406 flow [2022-07-12 10:16:13,105 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 173 places, 171 transitions, 406 flow, removed 0 selfloop flow, removed 0 redundant places. [2022-07-12 10:16:13,107 INFO L242 Difference]: Finished difference. Result has 174 places, 145 transitions, 321 flow [2022-07-12 10:16:13,107 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=191, PETRI_DIFFERENCE_MINUEND_FLOW=364, PETRI_DIFFERENCE_MINUEND_PLACES=171, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=167, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=165, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=321, PETRI_PLACES=174, PETRI_TRANSITIONS=145} [2022-07-12 10:16:13,108 INFO L279 CegarLoopForPetriNet]: 172 programPoint places, 2 predicate places. [2022-07-12 10:16:13,108 INFO L495 AbstractCegarLoop]: Abstraction has has 174 places, 145 transitions, 321 flow [2022-07-12 10:16:13,108 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 155.0) internal successors, (465), 3 states have internal predecessors, (465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:13,108 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:13,109 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:13,109 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-07-12 10:16:13,109 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:13,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:13,109 INFO L85 PathProgramCache]: Analyzing trace with hash -541659640, now seen corresponding path program 1 times [2022-07-12 10:16:13,109 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:13,110 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1720676968] [2022-07-12 10:16:13,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:13,110 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:13,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:13,149 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:13,150 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:13,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1720676968] [2022-07-12 10:16:13,150 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1720676968] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 10:16:13,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1935835732] [2022-07-12 10:16:13,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:13,150 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:13,151 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 10:16:13,152 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 10:16:13,153 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-07-12 10:16:13,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:13,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 4 conjunts are in the unsatisfiable core [2022-07-12 10:16:13,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 10:16:13,264 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:13,264 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 10:16:13,306 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:13,306 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1935835732] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 10:16:13,306 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 10:16:13,307 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2022-07-12 10:16:13,307 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1697230618] [2022-07-12 10:16:13,307 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 10:16:13,308 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-12 10:16:13,308 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:13,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-12 10:16:13,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-07-12 10:16:13,310 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 153 out of 191 [2022-07-12 10:16:13,311 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 174 places, 145 transitions, 321 flow. Second operand has 10 states, 10 states have (on average 155.3) internal successors, (1553), 10 states have internal predecessors, (1553), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:13,312 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:13,312 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 153 of 191 [2022-07-12 10:16:13,312 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:13,393 INFO L129 PetriNetUnfolder]: 0/166 cut-off events. [2022-07-12 10:16:13,393 INFO L130 PetriNetUnfolder]: For 10/10 co-relation queries the response was YES. [2022-07-12 10:16:13,393 INFO L84 FinitePrefix]: Finished finitePrefix Result has 214 conditions, 166 events. 0/166 cut-off events. For 10/10 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 255 event pairs, 0 based on Foata normal form. 2/168 useless extension candidates. Maximal degree in co-relation 0. Up to 7 conditions per place. [2022-07-12 10:16:13,394 INFO L132 encePairwiseOnDemand]: 185/191 looper letters, 13 selfloop transitions, 9 changer transitions 0/155 dead transitions. [2022-07-12 10:16:13,394 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 162 places, 155 transitions, 387 flow [2022-07-12 10:16:13,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-12 10:16:13,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2022-07-12 10:16:13,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 1401 transitions. [2022-07-12 10:16:13,397 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.8150087260034904 [2022-07-12 10:16:13,397 INFO L72 ComplementDD]: Start complementDD. Operand 9 states and 1401 transitions. [2022-07-12 10:16:13,397 INFO L73 IsDeterministic]: Start isDeterministic. Operand 9 states and 1401 transitions. [2022-07-12 10:16:13,397 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:13,398 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 9 states and 1401 transitions. [2022-07-12 10:16:13,400 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 10 states, 9 states have (on average 155.66666666666666) internal successors, (1401), 9 states have internal predecessors, (1401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:13,402 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 10 states, 10 states have (on average 191.0) internal successors, (1910), 10 states have internal predecessors, (1910), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:13,402 INFO L81 ComplementDD]: Finished complementDD. Result has 10 states, 10 states have (on average 191.0) internal successors, (1910), 10 states have internal predecessors, (1910), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:13,403 INFO L186 Difference]: Start difference. First operand has 174 places, 145 transitions, 321 flow. Second operand 9 states and 1401 transitions. [2022-07-12 10:16:13,403 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 162 places, 155 transitions, 387 flow [2022-07-12 10:16:13,404 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 161 places, 155 transitions, 379 flow, removed 3 selfloop flow, removed 1 redundant places. [2022-07-12 10:16:13,406 INFO L242 Difference]: Finished difference. Result has 164 places, 151 transitions, 363 flow [2022-07-12 10:16:13,406 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=191, PETRI_DIFFERENCE_MINUEND_FLOW=313, PETRI_DIFFERENCE_MINUEND_PLACES=153, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=145, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=139, PETRI_DIFFERENCE_SUBTRAHEND_STATES=9, PETRI_FLOW=363, PETRI_PLACES=164, PETRI_TRANSITIONS=151} [2022-07-12 10:16:13,408 INFO L279 CegarLoopForPetriNet]: 172 programPoint places, -8 predicate places. [2022-07-12 10:16:13,408 INFO L495 AbstractCegarLoop]: Abstraction has has 164 places, 151 transitions, 363 flow [2022-07-12 10:16:13,409 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 155.3) internal successors, (1553), 10 states have internal predecessors, (1553), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:13,410 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:13,410 INFO L200 CegarLoopForPetriNet]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:13,433 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-07-12 10:16:13,627 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-07-12 10:16:13,628 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:13,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:13,628 INFO L85 PathProgramCache]: Analyzing trace with hash -522533731, now seen corresponding path program 1 times [2022-07-12 10:16:13,628 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:13,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1612323115] [2022-07-12 10:16:13,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:13,628 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:13,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-12 10:16:13,644 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-07-12 10:16:13,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-12 10:16:13,660 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-07-12 10:16:13,661 INFO L271 BasicCegarLoop]: Counterexample is feasible [2022-07-12 10:16:13,661 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (1 of 2 remaining) [2022-07-12 10:16:13,661 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 2 remaining) [2022-07-12 10:16:13,661 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-07-12 10:16:13,661 INFO L356 BasicCegarLoop]: Path program histogram: [1, 1, 1] [2022-07-12 10:16:13,661 WARN L231 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2022-07-12 10:16:13,662 INFO L509 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2022-07-12 10:16:13,683 INFO L135 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2022-07-12 10:16:13,687 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 202 places, 226 transitions, 496 flow [2022-07-12 10:16:13,744 INFO L129 PetriNetUnfolder]: 81/587 cut-off events. [2022-07-12 10:16:13,744 INFO L130 PetriNetUnfolder]: For 48/48 co-relation queries the response was YES. [2022-07-12 10:16:13,750 INFO L84 FinitePrefix]: Finished finitePrefix Result has 642 conditions, 587 events. 81/587 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2318 event pairs, 6 based on Foata normal form. 0/501 useless extension candidates. Maximal degree in co-relation 408. Up to 32 conditions per place. [2022-07-12 10:16:13,750 INFO L82 GeneralOperation]: Start removeDead. Operand has 202 places, 226 transitions, 496 flow [2022-07-12 10:16:13,755 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 202 places, 226 transitions, 496 flow [2022-07-12 10:16:13,757 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-12 10:16:13,758 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@2db21756, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@16dd23c4 [2022-07-12 10:16:13,758 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-07-12 10:16:13,763 INFO L129 PetriNetUnfolder]: 6/95 cut-off events. [2022-07-12 10:16:13,763 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2022-07-12 10:16:13,763 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:13,763 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:13,764 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:13,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:13,764 INFO L85 PathProgramCache]: Analyzing trace with hash 1302091798, now seen corresponding path program 1 times [2022-07-12 10:16:13,764 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:13,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255505257] [2022-07-12 10:16:13,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:13,765 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:13,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:13,794 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:13,794 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:13,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255505257] [2022-07-12 10:16:13,794 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1255505257] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 10:16:13,795 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 10:16:13,795 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-12 10:16:13,795 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773860978] [2022-07-12 10:16:13,795 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 10:16:13,795 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-12 10:16:13,795 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:13,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-12 10:16:13,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-12 10:16:13,796 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 181 out of 226 [2022-07-12 10:16:13,797 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 202 places, 226 transitions, 496 flow. Second operand has 3 states, 3 states have (on average 182.0) internal successors, (546), 3 states have internal predecessors, (546), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:13,797 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:13,797 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 181 of 226 [2022-07-12 10:16:13,797 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:13,869 INFO L129 PetriNetUnfolder]: 20/503 cut-off events. [2022-07-12 10:16:13,869 INFO L130 PetriNetUnfolder]: For 130/212 co-relation queries the response was YES. [2022-07-12 10:16:13,879 INFO L84 FinitePrefix]: Finished finitePrefix Result has 619 conditions, 503 events. 20/503 cut-off events. For 130/212 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1992 event pairs, 6 based on Foata normal form. 410/889 useless extension candidates. Maximal degree in co-relation 377. Up to 56 conditions per place. [2022-07-12 10:16:13,880 INFO L132 encePairwiseOnDemand]: 194/226 looper letters, 13 selfloop transitions, 2 changer transitions 24/200 dead transitions. [2022-07-12 10:16:13,880 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 203 places, 200 transitions, 482 flow [2022-07-12 10:16:13,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-12 10:16:13,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2022-07-12 10:16:13,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 599 transitions. [2022-07-12 10:16:13,882 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.883480825958702 [2022-07-12 10:16:13,882 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 599 transitions. [2022-07-12 10:16:13,882 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 599 transitions. [2022-07-12 10:16:13,883 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:13,883 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 599 transitions. [2022-07-12 10:16:13,884 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 199.66666666666666) internal successors, (599), 3 states have internal predecessors, (599), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:13,885 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 226.0) internal successors, (904), 4 states have internal predecessors, (904), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:13,885 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 226.0) internal successors, (904), 4 states have internal predecessors, (904), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:13,885 INFO L186 Difference]: Start difference. First operand has 202 places, 226 transitions, 496 flow. Second operand 3 states and 599 transitions. [2022-07-12 10:16:13,885 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 203 places, 200 transitions, 482 flow [2022-07-12 10:16:13,886 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 203 places, 200 transitions, 482 flow, removed 0 selfloop flow, removed 0 redundant places. [2022-07-12 10:16:13,888 INFO L242 Difference]: Finished difference. Result has 204 places, 173 transitions, 388 flow [2022-07-12 10:16:13,889 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=226, PETRI_DIFFERENCE_MINUEND_FLOW=436, PETRI_DIFFERENCE_MINUEND_PLACES=201, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=196, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=194, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=388, PETRI_PLACES=204, PETRI_TRANSITIONS=173} [2022-07-12 10:16:13,890 INFO L279 CegarLoopForPetriNet]: 202 programPoint places, 2 predicate places. [2022-07-12 10:16:13,890 INFO L495 AbstractCegarLoop]: Abstraction has has 204 places, 173 transitions, 388 flow [2022-07-12 10:16:13,890 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 182.0) internal successors, (546), 3 states have internal predecessors, (546), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:13,890 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:13,890 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:13,890 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-07-12 10:16:13,891 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:13,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:13,891 INFO L85 PathProgramCache]: Analyzing trace with hash 2147169159, now seen corresponding path program 1 times [2022-07-12 10:16:13,891 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:13,891 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535100660] [2022-07-12 10:16:13,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:13,892 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:13,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:13,936 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:13,937 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:13,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [535100660] [2022-07-12 10:16:13,937 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [535100660] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 10:16:13,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [697336712] [2022-07-12 10:16:13,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:13,937 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:13,938 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 10:16:13,940 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 10:16:13,956 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-07-12 10:16:14,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:14,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 4 conjunts are in the unsatisfiable core [2022-07-12 10:16:14,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 10:16:14,047 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:14,047 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 10:16:14,077 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:14,077 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [697336712] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 10:16:14,078 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 10:16:14,078 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2022-07-12 10:16:14,078 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194316492] [2022-07-12 10:16:14,078 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 10:16:14,078 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-12 10:16:14,078 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:14,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-12 10:16:14,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-07-12 10:16:14,081 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 180 out of 226 [2022-07-12 10:16:14,082 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 204 places, 173 transitions, 388 flow. Second operand has 10 states, 10 states have (on average 182.3) internal successors, (1823), 10 states have internal predecessors, (1823), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:14,082 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:14,082 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 180 of 226 [2022-07-12 10:16:14,082 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:14,147 INFO L129 PetriNetUnfolder]: 0/215 cut-off events. [2022-07-12 10:16:14,147 INFO L130 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2022-07-12 10:16:14,147 INFO L84 FinitePrefix]: Finished finitePrefix Result has 279 conditions, 215 events. 0/215 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 439 event pairs, 0 based on Foata normal form. 2/217 useless extension candidates. Maximal degree in co-relation 0. Up to 11 conditions per place. [2022-07-12 10:16:14,148 INFO L132 encePairwiseOnDemand]: 220/226 looper letters, 14 selfloop transitions, 9 changer transitions 0/183 dead transitions. [2022-07-12 10:16:14,148 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 192 places, 183 transitions, 456 flow [2022-07-12 10:16:14,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-12 10:16:14,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2022-07-12 10:16:14,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 1645 transitions. [2022-07-12 10:16:14,151 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.8087512291052114 [2022-07-12 10:16:14,152 INFO L72 ComplementDD]: Start complementDD. Operand 9 states and 1645 transitions. [2022-07-12 10:16:14,152 INFO L73 IsDeterministic]: Start isDeterministic. Operand 9 states and 1645 transitions. [2022-07-12 10:16:14,152 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:14,153 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 9 states and 1645 transitions. [2022-07-12 10:16:14,155 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 10 states, 9 states have (on average 182.77777777777777) internal successors, (1645), 9 states have internal predecessors, (1645), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:14,157 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 10 states, 10 states have (on average 226.0) internal successors, (2260), 10 states have internal predecessors, (2260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:14,158 INFO L81 ComplementDD]: Finished complementDD. Result has 10 states, 10 states have (on average 226.0) internal successors, (2260), 10 states have internal predecessors, (2260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:14,159 INFO L186 Difference]: Start difference. First operand has 204 places, 173 transitions, 388 flow. Second operand 9 states and 1645 transitions. [2022-07-12 10:16:14,159 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 192 places, 183 transitions, 456 flow [2022-07-12 10:16:14,161 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 191 places, 183 transitions, 442 flow, removed 6 selfloop flow, removed 1 redundant places. [2022-07-12 10:16:14,162 INFO L242 Difference]: Finished difference. Result has 194 places, 179 transitions, 424 flow [2022-07-12 10:16:14,163 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=226, PETRI_DIFFERENCE_MINUEND_FLOW=374, PETRI_DIFFERENCE_MINUEND_PLACES=183, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=173, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=167, PETRI_DIFFERENCE_SUBTRAHEND_STATES=9, PETRI_FLOW=424, PETRI_PLACES=194, PETRI_TRANSITIONS=179} [2022-07-12 10:16:14,163 INFO L279 CegarLoopForPetriNet]: 202 programPoint places, -8 predicate places. [2022-07-12 10:16:14,164 INFO L495 AbstractCegarLoop]: Abstraction has has 194 places, 179 transitions, 424 flow [2022-07-12 10:16:14,164 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 182.3) internal successors, (1823), 10 states have internal predecessors, (1823), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:14,164 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:14,165 INFO L200 CegarLoopForPetriNet]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:14,185 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-07-12 10:16:14,387 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:14,387 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:14,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:14,388 INFO L85 PathProgramCache]: Analyzing trace with hash 1838398022, now seen corresponding path program 1 times [2022-07-12 10:16:14,388 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:14,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337065942] [2022-07-12 10:16:14,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:14,388 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:14,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:14,439 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:14,440 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:14,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337065942] [2022-07-12 10:16:14,440 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1337065942] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 10:16:14,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [507221229] [2022-07-12 10:16:14,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:14,440 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:14,440 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 10:16:14,441 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 10:16:14,442 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-07-12 10:16:14,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:14,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 8 conjunts are in the unsatisfiable core [2022-07-12 10:16:14,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 10:16:14,581 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:14,581 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 10:16:14,663 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:14,663 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [507221229] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 10:16:14,664 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 10:16:14,664 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 18 [2022-07-12 10:16:14,665 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025026763] [2022-07-12 10:16:14,665 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 10:16:14,665 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-07-12 10:16:14,666 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:14,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-07-12 10:16:14,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2022-07-12 10:16:14,668 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 180 out of 226 [2022-07-12 10:16:14,671 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 194 places, 179 transitions, 424 flow. Second operand has 18 states, 18 states have (on average 182.61111111111111) internal successors, (3287), 18 states have internal predecessors, (3287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:14,671 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:14,671 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 180 of 226 [2022-07-12 10:16:14,671 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:14,780 INFO L129 PetriNetUnfolder]: 0/191 cut-off events. [2022-07-12 10:16:14,780 INFO L130 PetriNetUnfolder]: For 18/18 co-relation queries the response was YES. [2022-07-12 10:16:14,780 INFO L84 FinitePrefix]: Finished finitePrefix Result has 270 conditions, 191 events. 0/191 cut-off events. For 18/18 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 301 event pairs, 0 based on Foata normal form. 2/193 useless extension candidates. Maximal degree in co-relation 0. Up to 6 conditions per place. [2022-07-12 10:16:14,781 INFO L132 encePairwiseOnDemand]: 221/226 looper letters, 15 selfloop transitions, 13 changer transitions 0/177 dead transitions. [2022-07-12 10:16:14,781 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 196 places, 177 transitions, 488 flow [2022-07-12 10:16:14,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-07-12 10:16:14,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2022-07-12 10:16:14,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 2730 transitions. [2022-07-12 10:16:14,786 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.8053097345132744 [2022-07-12 10:16:14,786 INFO L72 ComplementDD]: Start complementDD. Operand 15 states and 2730 transitions. [2022-07-12 10:16:14,786 INFO L73 IsDeterministic]: Start isDeterministic. Operand 15 states and 2730 transitions. [2022-07-12 10:16:14,787 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:14,787 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 15 states and 2730 transitions. [2022-07-12 10:16:14,791 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 16 states, 15 states have (on average 182.0) internal successors, (2730), 15 states have internal predecessors, (2730), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:14,795 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 16 states, 16 states have (on average 226.0) internal successors, (3616), 16 states have internal predecessors, (3616), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:14,796 INFO L81 ComplementDD]: Finished complementDD. Result has 16 states, 16 states have (on average 226.0) internal successors, (3616), 16 states have internal predecessors, (3616), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:14,796 INFO L186 Difference]: Start difference. First operand has 194 places, 179 transitions, 424 flow. Second operand 15 states and 2730 transitions. [2022-07-12 10:16:14,796 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 196 places, 177 transitions, 488 flow [2022-07-12 10:16:14,797 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 192 places, 177 transitions, 471 flow, removed 3 selfloop flow, removed 4 redundant places. [2022-07-12 10:16:14,799 INFO L242 Difference]: Finished difference. Result has 192 places, 170 transitions, 420 flow [2022-07-12 10:16:14,799 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=226, PETRI_DIFFERENCE_MINUEND_FLOW=381, PETRI_DIFFERENCE_MINUEND_PLACES=178, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=167, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=10, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=157, PETRI_DIFFERENCE_SUBTRAHEND_STATES=15, PETRI_FLOW=420, PETRI_PLACES=192, PETRI_TRANSITIONS=170} [2022-07-12 10:16:14,799 INFO L279 CegarLoopForPetriNet]: 202 programPoint places, -10 predicate places. [2022-07-12 10:16:14,800 INFO L495 AbstractCegarLoop]: Abstraction has has 192 places, 170 transitions, 420 flow [2022-07-12 10:16:14,801 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 182.61111111111111) internal successors, (3287), 18 states have internal predecessors, (3287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:14,801 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:14,801 INFO L200 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:14,820 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-07-12 10:16:15,020 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:15,021 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:15,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:15,021 INFO L85 PathProgramCache]: Analyzing trace with hash 285938549, now seen corresponding path program 1 times [2022-07-12 10:16:15,021 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:15,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1850459791] [2022-07-12 10:16:15,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:15,021 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:15,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-12 10:16:15,053 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-07-12 10:16:15,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-12 10:16:15,081 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-07-12 10:16:15,081 INFO L271 BasicCegarLoop]: Counterexample is feasible [2022-07-12 10:16:15,081 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (1 of 2 remaining) [2022-07-12 10:16:15,082 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 2 remaining) [2022-07-12 10:16:15,082 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-07-12 10:16:15,082 INFO L356 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2022-07-12 10:16:15,082 WARN L231 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2022-07-12 10:16:15,082 INFO L509 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2022-07-12 10:16:15,103 INFO L135 ThreadInstanceAdder]: Constructed 5 joinOtherThreadTransitions. [2022-07-12 10:16:15,105 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 232 places, 261 transitions, 582 flow [2022-07-12 10:16:15,209 INFO L129 PetriNetUnfolder]: 140/926 cut-off events. [2022-07-12 10:16:15,210 INFO L130 PetriNetUnfolder]: For 110/110 co-relation queries the response was YES. [2022-07-12 10:16:15,216 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1037 conditions, 926 events. 140/926 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 4352 event pairs, 23 based on Foata normal form. 0/796 useless extension candidates. Maximal degree in co-relation 632. Up to 80 conditions per place. [2022-07-12 10:16:15,217 INFO L82 GeneralOperation]: Start removeDead. Operand has 232 places, 261 transitions, 582 flow [2022-07-12 10:16:15,224 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 232 places, 261 transitions, 582 flow [2022-07-12 10:16:15,226 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-12 10:16:15,226 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@2db21756, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@16dd23c4 [2022-07-12 10:16:15,227 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-07-12 10:16:15,230 INFO L129 PetriNetUnfolder]: 3/86 cut-off events. [2022-07-12 10:16:15,230 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2022-07-12 10:16:15,230 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:15,230 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:15,231 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:15,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:15,231 INFO L85 PathProgramCache]: Analyzing trace with hash 852928438, now seen corresponding path program 1 times [2022-07-12 10:16:15,231 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:15,231 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351997265] [2022-07-12 10:16:15,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:15,231 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:15,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:15,245 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:15,245 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:15,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [351997265] [2022-07-12 10:16:15,245 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [351997265] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 10:16:15,245 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 10:16:15,245 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-12 10:16:15,246 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1892212690] [2022-07-12 10:16:15,246 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 10:16:15,246 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-12 10:16:15,246 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:15,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-12 10:16:15,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-12 10:16:15,247 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 208 out of 261 [2022-07-12 10:16:15,248 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 232 places, 261 transitions, 582 flow. Second operand has 3 states, 3 states have (on average 209.0) internal successors, (627), 3 states have internal predecessors, (627), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:15,248 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:15,248 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 208 of 261 [2022-07-12 10:16:15,248 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:15,386 INFO L129 PetriNetUnfolder]: 53/815 cut-off events. [2022-07-12 10:16:15,389 INFO L130 PetriNetUnfolder]: For 288/388 co-relation queries the response was YES. [2022-07-12 10:16:15,392 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1041 conditions, 815 events. 53/815 cut-off events. For 288/388 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 3851 event pairs, 23 based on Foata normal form. 847/1620 useless extension candidates. Maximal degree in co-relation 608. Up to 110 conditions per place. [2022-07-12 10:16:15,393 INFO L132 encePairwiseOnDemand]: 223/261 looper letters, 14 selfloop transitions, 2 changer transitions 25/229 dead transitions. [2022-07-12 10:16:15,393 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 233 places, 229 transitions, 560 flow [2022-07-12 10:16:15,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-12 10:16:15,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2022-07-12 10:16:15,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 688 transitions. [2022-07-12 10:16:15,394 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.8786717752234994 [2022-07-12 10:16:15,394 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 688 transitions. [2022-07-12 10:16:15,395 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 688 transitions. [2022-07-12 10:16:15,395 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:15,395 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 688 transitions. [2022-07-12 10:16:15,396 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 229.33333333333334) internal successors, (688), 3 states have internal predecessors, (688), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:15,397 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 261.0) internal successors, (1044), 4 states have internal predecessors, (1044), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:15,397 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 261.0) internal successors, (1044), 4 states have internal predecessors, (1044), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:15,398 INFO L186 Difference]: Start difference. First operand has 232 places, 261 transitions, 582 flow. Second operand 3 states and 688 transitions. [2022-07-12 10:16:15,398 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 233 places, 229 transitions, 560 flow [2022-07-12 10:16:15,399 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 233 places, 229 transitions, 560 flow, removed 0 selfloop flow, removed 0 redundant places. [2022-07-12 10:16:15,401 INFO L242 Difference]: Finished difference. Result has 234 places, 201 transitions, 457 flow [2022-07-12 10:16:15,401 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=261, PETRI_DIFFERENCE_MINUEND_FLOW=510, PETRI_DIFFERENCE_MINUEND_PLACES=231, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=225, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=223, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=457, PETRI_PLACES=234, PETRI_TRANSITIONS=201} [2022-07-12 10:16:15,402 INFO L279 CegarLoopForPetriNet]: 232 programPoint places, 2 predicate places. [2022-07-12 10:16:15,402 INFO L495 AbstractCegarLoop]: Abstraction has has 234 places, 201 transitions, 457 flow [2022-07-12 10:16:15,402 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 209.0) internal successors, (627), 3 states have internal predecessors, (627), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:15,403 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:15,403 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:15,403 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-07-12 10:16:15,403 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:15,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:15,405 INFO L85 PathProgramCache]: Analyzing trace with hash 2043196486, now seen corresponding path program 1 times [2022-07-12 10:16:15,405 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:15,405 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [412214259] [2022-07-12 10:16:15,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:15,405 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:15,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:15,431 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:15,431 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:15,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [412214259] [2022-07-12 10:16:15,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [412214259] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 10:16:15,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1839870832] [2022-07-12 10:16:15,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:15,432 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:15,432 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 10:16:15,433 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 10:16:15,434 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-07-12 10:16:15,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:15,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 4 conjunts are in the unsatisfiable core [2022-07-12 10:16:15,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 10:16:15,532 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:15,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 10:16:15,558 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:15,559 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1839870832] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 10:16:15,559 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 10:16:15,559 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2022-07-12 10:16:15,559 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798177577] [2022-07-12 10:16:15,559 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 10:16:15,560 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-12 10:16:15,560 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:15,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-12 10:16:15,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-07-12 10:16:15,562 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 207 out of 261 [2022-07-12 10:16:15,564 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 234 places, 201 transitions, 457 flow. Second operand has 10 states, 10 states have (on average 209.3) internal successors, (2093), 10 states have internal predecessors, (2093), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:15,564 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:15,564 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 207 of 261 [2022-07-12 10:16:15,564 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:15,644 INFO L129 PetriNetUnfolder]: 0/264 cut-off events. [2022-07-12 10:16:15,644 INFO L130 PetriNetUnfolder]: For 33/33 co-relation queries the response was YES. [2022-07-12 10:16:15,644 INFO L84 FinitePrefix]: Finished finitePrefix Result has 345 conditions, 264 events. 0/264 cut-off events. For 33/33 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 625 event pairs, 0 based on Foata normal form. 2/266 useless extension candidates. Maximal degree in co-relation 0. Up to 15 conditions per place. [2022-07-12 10:16:15,645 INFO L132 encePairwiseOnDemand]: 255/261 looper letters, 15 selfloop transitions, 9 changer transitions 0/211 dead transitions. [2022-07-12 10:16:15,645 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 222 places, 211 transitions, 527 flow [2022-07-12 10:16:15,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-12 10:16:15,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2022-07-12 10:16:15,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 1889 transitions. [2022-07-12 10:16:15,648 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.8041719880800341 [2022-07-12 10:16:15,648 INFO L72 ComplementDD]: Start complementDD. Operand 9 states and 1889 transitions. [2022-07-12 10:16:15,648 INFO L73 IsDeterministic]: Start isDeterministic. Operand 9 states and 1889 transitions. [2022-07-12 10:16:15,649 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:15,649 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 9 states and 1889 transitions. [2022-07-12 10:16:15,652 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 10 states, 9 states have (on average 209.88888888888889) internal successors, (1889), 9 states have internal predecessors, (1889), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:15,655 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 10 states, 10 states have (on average 261.0) internal successors, (2610), 10 states have internal predecessors, (2610), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:15,655 INFO L81 ComplementDD]: Finished complementDD. Result has 10 states, 10 states have (on average 261.0) internal successors, (2610), 10 states have internal predecessors, (2610), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:15,656 INFO L186 Difference]: Start difference. First operand has 234 places, 201 transitions, 457 flow. Second operand 9 states and 1889 transitions. [2022-07-12 10:16:15,656 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 222 places, 211 transitions, 527 flow [2022-07-12 10:16:15,657 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 221 places, 211 transitions, 505 flow, removed 10 selfloop flow, removed 1 redundant places. [2022-07-12 10:16:15,659 INFO L242 Difference]: Finished difference. Result has 224 places, 207 transitions, 485 flow [2022-07-12 10:16:15,659 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=261, PETRI_DIFFERENCE_MINUEND_FLOW=435, PETRI_DIFFERENCE_MINUEND_PLACES=213, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=201, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=195, PETRI_DIFFERENCE_SUBTRAHEND_STATES=9, PETRI_FLOW=485, PETRI_PLACES=224, PETRI_TRANSITIONS=207} [2022-07-12 10:16:15,659 INFO L279 CegarLoopForPetriNet]: 232 programPoint places, -8 predicate places. [2022-07-12 10:16:15,660 INFO L495 AbstractCegarLoop]: Abstraction has has 224 places, 207 transitions, 485 flow [2022-07-12 10:16:15,661 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 209.3) internal successors, (2093), 10 states have internal predecessors, (2093), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:15,661 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:15,661 INFO L200 CegarLoopForPetriNet]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:15,685 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-07-12 10:16:15,878 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-07-12 10:16:15,878 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:15,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:15,879 INFO L85 PathProgramCache]: Analyzing trace with hash -927777533, now seen corresponding path program 1 times [2022-07-12 10:16:15,879 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:15,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1550814252] [2022-07-12 10:16:15,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:15,879 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:15,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:15,928 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:15,928 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:15,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1550814252] [2022-07-12 10:16:15,928 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1550814252] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 10:16:15,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1718858048] [2022-07-12 10:16:15,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:15,928 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:15,929 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 10:16:15,930 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 10:16:15,931 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-07-12 10:16:16,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:16,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 8 conjunts are in the unsatisfiable core [2022-07-12 10:16:16,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 10:16:16,069 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:16,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 10:16:16,140 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:16,141 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1718858048] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 10:16:16,141 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 10:16:16,141 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 18 [2022-07-12 10:16:16,141 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923948440] [2022-07-12 10:16:16,141 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 10:16:16,142 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-07-12 10:16:16,142 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:16,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-07-12 10:16:16,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2022-07-12 10:16:16,145 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 207 out of 261 [2022-07-12 10:16:16,148 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 224 places, 207 transitions, 485 flow. Second operand has 18 states, 18 states have (on average 209.61111111111111) internal successors, (3773), 18 states have internal predecessors, (3773), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:16,148 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:16,148 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 207 of 261 [2022-07-12 10:16:16,148 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:16,274 INFO L129 PetriNetUnfolder]: 0/228 cut-off events. [2022-07-12 10:16:16,275 INFO L130 PetriNetUnfolder]: For 24/24 co-relation queries the response was YES. [2022-07-12 10:16:16,275 INFO L84 FinitePrefix]: Finished finitePrefix Result has 324 conditions, 228 events. 0/228 cut-off events. For 24/24 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 405 event pairs, 0 based on Foata normal form. 3/231 useless extension candidates. Maximal degree in co-relation 0. Up to 7 conditions per place. [2022-07-12 10:16:16,275 INFO L132 encePairwiseOnDemand]: 256/261 looper letters, 18 selfloop transitions, 16 changer transitions 0/210 dead transitions. [2022-07-12 10:16:16,276 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 229 places, 210 transitions, 585 flow [2022-07-12 10:16:16,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-07-12 10:16:16,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2022-07-12 10:16:16,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 3763 transitions. [2022-07-12 10:16:16,281 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.8009791400595998 [2022-07-12 10:16:16,281 INFO L72 ComplementDD]: Start complementDD. Operand 18 states and 3763 transitions. [2022-07-12 10:16:16,281 INFO L73 IsDeterministic]: Start isDeterministic. Operand 18 states and 3763 transitions. [2022-07-12 10:16:16,283 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:16,283 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 18 states and 3763 transitions. [2022-07-12 10:16:16,288 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 19 states, 18 states have (on average 209.05555555555554) internal successors, (3763), 18 states have internal predecessors, (3763), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:16,293 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 19 states, 19 states have (on average 261.0) internal successors, (4959), 19 states have internal predecessors, (4959), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:16,293 INFO L81 ComplementDD]: Finished complementDD. Result has 19 states, 19 states have (on average 261.0) internal successors, (4959), 19 states have internal predecessors, (4959), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:16,294 INFO L186 Difference]: Start difference. First operand has 224 places, 207 transitions, 485 flow. Second operand 18 states and 3763 transitions. [2022-07-12 10:16:16,294 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 229 places, 210 transitions, 585 flow [2022-07-12 10:16:16,295 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 225 places, 210 transitions, 564 flow, removed 4 selfloop flow, removed 4 redundant places. [2022-07-12 10:16:16,297 INFO L242 Difference]: Finished difference. Result has 225 places, 201 transitions, 500 flow [2022-07-12 10:16:16,297 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=261, PETRI_DIFFERENCE_MINUEND_FLOW=442, PETRI_DIFFERENCE_MINUEND_PLACES=208, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=195, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=10, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=185, PETRI_DIFFERENCE_SUBTRAHEND_STATES=18, PETRI_FLOW=500, PETRI_PLACES=225, PETRI_TRANSITIONS=201} [2022-07-12 10:16:16,298 INFO L279 CegarLoopForPetriNet]: 232 programPoint places, -7 predicate places. [2022-07-12 10:16:16,298 INFO L495 AbstractCegarLoop]: Abstraction has has 225 places, 201 transitions, 500 flow [2022-07-12 10:16:16,299 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 209.61111111111111) internal successors, (3773), 18 states have internal predecessors, (3773), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:16,299 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:16,300 INFO L200 CegarLoopForPetriNet]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:16,333 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-07-12 10:16:16,519 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-07-12 10:16:16,520 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:16,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:16,520 INFO L85 PathProgramCache]: Analyzing trace with hash 1541250035, now seen corresponding path program 1 times [2022-07-12 10:16:16,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:16,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [153392585] [2022-07-12 10:16:16,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:16,520 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:16,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-12 10:16:16,534 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-07-12 10:16:16,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-12 10:16:16,559 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-07-12 10:16:16,562 INFO L271 BasicCegarLoop]: Counterexample is feasible [2022-07-12 10:16:16,562 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (1 of 2 remaining) [2022-07-12 10:16:16,562 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 2 remaining) [2022-07-12 10:16:16,563 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2022-07-12 10:16:16,563 INFO L356 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2022-07-12 10:16:16,563 WARN L231 ceAbstractionStarter]: 5 thread instances were not sufficient, I will increase this number and restart the analysis [2022-07-12 10:16:16,563 INFO L509 ceAbstractionStarter]: Constructing petrified ICFG for 6 thread instances. [2022-07-12 10:16:16,588 INFO L135 ThreadInstanceAdder]: Constructed 6 joinOtherThreadTransitions. [2022-07-12 10:16:16,590 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 262 places, 296 transitions, 670 flow [2022-07-12 10:16:16,759 INFO L129 PetriNetUnfolder]: 263/1553 cut-off events. [2022-07-12 10:16:16,759 INFO L130 PetriNetUnfolder]: For 242/242 co-relation queries the response was YES. [2022-07-12 10:16:16,782 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1785 conditions, 1553 events. 263/1553 cut-off events. For 242/242 co-relation queries the response was YES. Maximal size of possible extension queue 28. Compared 8743 event pairs, 72 based on Foata normal form. 0/1347 useless extension candidates. Maximal degree in co-relation 1025. Up to 192 conditions per place. [2022-07-12 10:16:16,782 INFO L82 GeneralOperation]: Start removeDead. Operand has 262 places, 296 transitions, 670 flow [2022-07-12 10:16:16,795 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 262 places, 296 transitions, 670 flow [2022-07-12 10:16:16,796 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-12 10:16:16,796 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@2db21756, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@16dd23c4 [2022-07-12 10:16:16,797 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-07-12 10:16:16,800 INFO L129 PetriNetUnfolder]: 6/95 cut-off events. [2022-07-12 10:16:16,800 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2022-07-12 10:16:16,800 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:16,801 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:16,801 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:16,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:16,801 INFO L85 PathProgramCache]: Analyzing trace with hash -1266573481, now seen corresponding path program 1 times [2022-07-12 10:16:16,801 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:16,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1418075750] [2022-07-12 10:16:16,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:16,802 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:16,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:16,811 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:16,812 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:16,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1418075750] [2022-07-12 10:16:16,812 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1418075750] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 10:16:16,812 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 10:16:16,812 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-12 10:16:16,812 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290430393] [2022-07-12 10:16:16,812 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 10:16:16,813 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-07-12 10:16:16,813 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:16,813 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-07-12 10:16:16,813 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-07-12 10:16:16,814 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 242 out of 296 [2022-07-12 10:16:16,814 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 262 places, 296 transitions, 670 flow. Second operand has 2 states, 2 states have (on average 242.5) internal successors, (485), 2 states have internal predecessors, (485), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:16,814 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:16,814 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 242 of 296 [2022-07-12 10:16:16,814 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:17,009 INFO L129 PetriNetUnfolder]: 135/1418 cut-off events. [2022-07-12 10:16:17,009 INFO L130 PetriNetUnfolder]: For 659/697 co-relation queries the response was YES. [2022-07-12 10:16:17,024 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1849 conditions, 1418 events. 135/1418 cut-off events. For 659/697 co-relation queries the response was YES. Maximal size of possible extension queue 28. Compared 8325 event pairs, 72 based on Foata normal form. 1306/2646 useless extension candidates. Maximal degree in co-relation 1018. Up to 199 conditions per place. [2022-07-12 10:16:17,026 INFO L132 encePairwiseOnDemand]: 255/296 looper letters, 6 selfloop transitions, 0 changer transitions 26/254 dead transitions. [2022-07-12 10:16:17,026 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 262 places, 254 transitions, 610 flow [2022-07-12 10:16:17,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-07-12 10:16:17,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2022-07-12 10:16:17,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 537 transitions. [2022-07-12 10:16:17,027 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.9070945945945946 [2022-07-12 10:16:17,027 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 537 transitions. [2022-07-12 10:16:17,027 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 537 transitions. [2022-07-12 10:16:17,028 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:17,028 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 537 transitions. [2022-07-12 10:16:17,029 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 268.5) internal successors, (537), 2 states have internal predecessors, (537), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:17,029 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 296.0) internal successors, (888), 3 states have internal predecessors, (888), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:17,030 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 296.0) internal successors, (888), 3 states have internal predecessors, (888), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:17,030 INFO L186 Difference]: Start difference. First operand has 262 places, 296 transitions, 670 flow. Second operand 2 states and 537 transitions. [2022-07-12 10:16:17,030 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 262 places, 254 transitions, 610 flow [2022-07-12 10:16:17,031 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 262 places, 254 transitions, 610 flow, removed 0 selfloop flow, removed 0 redundant places. [2022-07-12 10:16:17,033 INFO L242 Difference]: Finished difference. Result has 262 places, 228 transitions, 516 flow [2022-07-12 10:16:17,033 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=296, PETRI_DIFFERENCE_MINUEND_FLOW=586, PETRI_DIFFERENCE_MINUEND_PLACES=261, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=254, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=254, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=516, PETRI_PLACES=262, PETRI_TRANSITIONS=228} [2022-07-12 10:16:17,034 INFO L279 CegarLoopForPetriNet]: 262 programPoint places, 0 predicate places. [2022-07-12 10:16:17,034 INFO L495 AbstractCegarLoop]: Abstraction has has 262 places, 228 transitions, 516 flow [2022-07-12 10:16:17,034 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 242.5) internal successors, (485), 2 states have internal predecessors, (485), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:17,034 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:17,034 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:17,035 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2022-07-12 10:16:17,035 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:17,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:17,035 INFO L85 PathProgramCache]: Analyzing trace with hash -1137490762, now seen corresponding path program 1 times [2022-07-12 10:16:17,035 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:17,035 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1323553745] [2022-07-12 10:16:17,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:17,036 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:17,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:17,052 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:17,053 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:17,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1323553745] [2022-07-12 10:16:17,053 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1323553745] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 10:16:17,053 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 10:16:17,053 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-12 10:16:17,053 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [199664053] [2022-07-12 10:16:17,053 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 10:16:17,053 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-12 10:16:17,054 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:17,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-12 10:16:17,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-12 10:16:17,055 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 235 out of 296 [2022-07-12 10:16:17,055 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 262 places, 228 transitions, 516 flow. Second operand has 3 states, 3 states have (on average 236.0) internal successors, (708), 3 states have internal predecessors, (708), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:17,055 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:17,055 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 235 of 296 [2022-07-12 10:16:17,055 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:17,101 INFO L129 PetriNetUnfolder]: 0/337 cut-off events. [2022-07-12 10:16:17,101 INFO L130 PetriNetUnfolder]: For 50/50 co-relation queries the response was YES. [2022-07-12 10:16:17,101 INFO L84 FinitePrefix]: Finished finitePrefix Result has 419 conditions, 337 events. 0/337 cut-off events. For 50/50 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 954 event pairs, 0 based on Foata normal form. 0/331 useless extension candidates. Maximal degree in co-relation 0. Up to 36 conditions per place. [2022-07-12 10:16:17,102 INFO L132 encePairwiseOnDemand]: 293/296 looper letters, 15 selfloop transitions, 2 changer transitions 0/232 dead transitions. [2022-07-12 10:16:17,102 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 244 places, 232 transitions, 558 flow [2022-07-12 10:16:17,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-12 10:16:17,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2022-07-12 10:16:17,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 723 transitions. [2022-07-12 10:16:17,103 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.8141891891891891 [2022-07-12 10:16:17,104 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 723 transitions. [2022-07-12 10:16:17,104 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 723 transitions. [2022-07-12 10:16:17,104 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:17,104 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 723 transitions. [2022-07-12 10:16:17,105 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 241.0) internal successors, (723), 3 states have internal predecessors, (723), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:17,106 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 296.0) internal successors, (1184), 4 states have internal predecessors, (1184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:17,106 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 296.0) internal successors, (1184), 4 states have internal predecessors, (1184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:17,106 INFO L186 Difference]: Start difference. First operand has 262 places, 228 transitions, 516 flow. Second operand 3 states and 723 transitions. [2022-07-12 10:16:17,107 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 244 places, 232 transitions, 558 flow [2022-07-12 10:16:17,108 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 244 places, 232 transitions, 528 flow, removed 15 selfloop flow, removed 0 redundant places. [2022-07-12 10:16:17,110 INFO L242 Difference]: Finished difference. Result has 245 places, 229 transitions, 498 flow [2022-07-12 10:16:17,110 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=296, PETRI_DIFFERENCE_MINUEND_FLOW=486, PETRI_DIFFERENCE_MINUEND_PLACES=242, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=228, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=226, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=498, PETRI_PLACES=245, PETRI_TRANSITIONS=229} [2022-07-12 10:16:17,110 INFO L279 CegarLoopForPetriNet]: 262 programPoint places, -17 predicate places. [2022-07-12 10:16:17,110 INFO L495 AbstractCegarLoop]: Abstraction has has 245 places, 229 transitions, 498 flow [2022-07-12 10:16:17,111 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 236.0) internal successors, (708), 3 states have internal predecessors, (708), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:17,111 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:17,111 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:17,111 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2022-07-12 10:16:17,111 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:17,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:17,111 INFO L85 PathProgramCache]: Analyzing trace with hash -853577659, now seen corresponding path program 1 times [2022-07-12 10:16:17,112 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:17,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1069469215] [2022-07-12 10:16:17,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:17,112 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:17,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:17,133 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:17,133 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:17,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1069469215] [2022-07-12 10:16:17,133 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1069469215] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 10:16:17,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [584198825] [2022-07-12 10:16:17,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:17,133 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:17,134 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 10:16:17,140 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 10:16:17,141 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-07-12 10:16:17,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:17,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 4 conjunts are in the unsatisfiable core [2022-07-12 10:16:17,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 10:16:17,255 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:17,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 10:16:17,275 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:17,276 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [584198825] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 10:16:17,276 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 10:16:17,276 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2022-07-12 10:16:17,276 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335734698] [2022-07-12 10:16:17,276 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 10:16:17,276 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-12 10:16:17,277 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:17,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-12 10:16:17,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-07-12 10:16:17,278 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 234 out of 296 [2022-07-12 10:16:17,279 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 245 places, 229 transitions, 498 flow. Second operand has 10 states, 10 states have (on average 236.3) internal successors, (2363), 10 states have internal predecessors, (2363), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:17,280 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:17,280 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 234 of 296 [2022-07-12 10:16:17,280 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:17,359 INFO L129 PetriNetUnfolder]: 0/313 cut-off events. [2022-07-12 10:16:17,359 INFO L130 PetriNetUnfolder]: For 8/8 co-relation queries the response was YES. [2022-07-12 10:16:17,359 INFO L84 FinitePrefix]: Finished finitePrefix Result has 398 conditions, 313 events. 0/313 cut-off events. For 8/8 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 809 event pairs, 0 based on Foata normal form. 2/315 useless extension candidates. Maximal degree in co-relation 0. Up to 19 conditions per place. [2022-07-12 10:16:17,360 INFO L132 encePairwiseOnDemand]: 290/296 looper letters, 16 selfloop transitions, 9 changer transitions 0/239 dead transitions. [2022-07-12 10:16:17,360 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 253 places, 239 transitions, 570 flow [2022-07-12 10:16:17,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-12 10:16:17,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2022-07-12 10:16:17,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 2133 transitions. [2022-07-12 10:16:17,363 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.8006756756756757 [2022-07-12 10:16:17,363 INFO L72 ComplementDD]: Start complementDD. Operand 9 states and 2133 transitions. [2022-07-12 10:16:17,363 INFO L73 IsDeterministic]: Start isDeterministic. Operand 9 states and 2133 transitions. [2022-07-12 10:16:17,364 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:17,364 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 9 states and 2133 transitions. [2022-07-12 10:16:17,367 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 10 states, 9 states have (on average 237.0) internal successors, (2133), 9 states have internal predecessors, (2133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:17,369 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 10 states, 10 states have (on average 296.0) internal successors, (2960), 10 states have internal predecessors, (2960), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:17,370 INFO L81 ComplementDD]: Finished complementDD. Result has 10 states, 10 states have (on average 296.0) internal successors, (2960), 10 states have internal predecessors, (2960), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:17,370 INFO L186 Difference]: Start difference. First operand has 245 places, 229 transitions, 498 flow. Second operand 9 states and 2133 transitions. [2022-07-12 10:16:17,370 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 253 places, 239 transitions, 570 flow [2022-07-12 10:16:17,371 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 252 places, 239 transitions, 568 flow, removed 0 selfloop flow, removed 1 redundant places. [2022-07-12 10:16:17,373 INFO L242 Difference]: Finished difference. Result has 255 places, 235 transitions, 546 flow [2022-07-12 10:16:17,373 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=296, PETRI_DIFFERENCE_MINUEND_FLOW=496, PETRI_DIFFERENCE_MINUEND_PLACES=244, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=229, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=223, PETRI_DIFFERENCE_SUBTRAHEND_STATES=9, PETRI_FLOW=546, PETRI_PLACES=255, PETRI_TRANSITIONS=235} [2022-07-12 10:16:17,373 INFO L279 CegarLoopForPetriNet]: 262 programPoint places, -7 predicate places. [2022-07-12 10:16:17,374 INFO L495 AbstractCegarLoop]: Abstraction has has 255 places, 235 transitions, 546 flow [2022-07-12 10:16:17,374 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 236.3) internal successors, (2363), 10 states have internal predecessors, (2363), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:17,374 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:17,374 INFO L200 CegarLoopForPetriNet]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:17,401 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-07-12 10:16:17,601 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:17,602 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:17,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:17,602 INFO L85 PathProgramCache]: Analyzing trace with hash -731885888, now seen corresponding path program 1 times [2022-07-12 10:16:17,602 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:17,602 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2097315344] [2022-07-12 10:16:17,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:17,602 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:17,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:17,647 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:17,648 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:17,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2097315344] [2022-07-12 10:16:17,648 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2097315344] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 10:16:17,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1456398255] [2022-07-12 10:16:17,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:17,648 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:17,649 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 10:16:17,650 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 10:16:17,651 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-07-12 10:16:17,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:17,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 8 conjunts are in the unsatisfiable core [2022-07-12 10:16:17,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 10:16:17,781 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:17,781 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 10:16:17,846 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:17,847 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1456398255] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 10:16:17,847 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 10:16:17,847 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 18 [2022-07-12 10:16:17,847 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560238710] [2022-07-12 10:16:17,847 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 10:16:17,847 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-07-12 10:16:17,848 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:17,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-07-12 10:16:17,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2022-07-12 10:16:17,850 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 234 out of 296 [2022-07-12 10:16:17,852 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 255 places, 235 transitions, 546 flow. Second operand has 18 states, 18 states have (on average 236.61111111111111) internal successors, (4259), 18 states have internal predecessors, (4259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:17,852 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:17,852 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 234 of 296 [2022-07-12 10:16:17,852 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:18,011 INFO L129 PetriNetUnfolder]: 0/265 cut-off events. [2022-07-12 10:16:18,012 INFO L130 PetriNetUnfolder]: For 30/30 co-relation queries the response was YES. [2022-07-12 10:16:18,012 INFO L84 FinitePrefix]: Finished finitePrefix Result has 379 conditions, 265 events. 0/265 cut-off events. For 30/30 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 509 event pairs, 0 based on Foata normal form. 4/269 useless extension candidates. Maximal degree in co-relation 0. Up to 9 conditions per place. [2022-07-12 10:16:18,012 INFO L132 encePairwiseOnDemand]: 291/296 looper letters, 21 selfloop transitions, 19 changer transitions 0/243 dead transitions. [2022-07-12 10:16:18,012 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 263 places, 243 transitions, 682 flow [2022-07-12 10:16:18,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-07-12 10:16:18,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2022-07-12 10:16:18,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 4958 transitions. [2022-07-12 10:16:18,016 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.7976190476190477 [2022-07-12 10:16:18,016 INFO L72 ComplementDD]: Start complementDD. Operand 21 states and 4958 transitions. [2022-07-12 10:16:18,016 INFO L73 IsDeterministic]: Start isDeterministic. Operand 21 states and 4958 transitions. [2022-07-12 10:16:18,017 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:18,017 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 21 states and 4958 transitions. [2022-07-12 10:16:18,022 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 22 states, 21 states have (on average 236.0952380952381) internal successors, (4958), 21 states have internal predecessors, (4958), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:18,027 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 22 states, 22 states have (on average 296.0) internal successors, (6512), 22 states have internal predecessors, (6512), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:18,028 INFO L81 ComplementDD]: Finished complementDD. Result has 22 states, 22 states have (on average 296.0) internal successors, (6512), 22 states have internal predecessors, (6512), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:18,028 INFO L186 Difference]: Start difference. First operand has 255 places, 235 transitions, 546 flow. Second operand 21 states and 4958 transitions. [2022-07-12 10:16:18,028 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 263 places, 243 transitions, 682 flow [2022-07-12 10:16:18,030 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 259 places, 243 transitions, 657 flow, removed 5 selfloop flow, removed 4 redundant places. [2022-07-12 10:16:18,032 INFO L242 Difference]: Finished difference. Result has 259 places, 232 transitions, 580 flow [2022-07-12 10:16:18,032 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=296, PETRI_DIFFERENCE_MINUEND_FLOW=503, PETRI_DIFFERENCE_MINUEND_PLACES=239, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=223, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=10, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=213, PETRI_DIFFERENCE_SUBTRAHEND_STATES=21, PETRI_FLOW=580, PETRI_PLACES=259, PETRI_TRANSITIONS=232} [2022-07-12 10:16:18,033 INFO L279 CegarLoopForPetriNet]: 262 programPoint places, -3 predicate places. [2022-07-12 10:16:18,033 INFO L495 AbstractCegarLoop]: Abstraction has has 259 places, 232 transitions, 580 flow [2022-07-12 10:16:18,034 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 236.61111111111111) internal successors, (4259), 18 states have internal predecessors, (4259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:18,034 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:18,034 INFO L200 CegarLoopForPetriNet]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:18,053 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-07-12 10:16:18,247 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-07-12 10:16:18,247 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:18,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:18,248 INFO L85 PathProgramCache]: Analyzing trace with hash -110238857, now seen corresponding path program 1 times [2022-07-12 10:16:18,248 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:18,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1327150689] [2022-07-12 10:16:18,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:18,248 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:18,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-12 10:16:18,260 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-07-12 10:16:18,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-12 10:16:18,290 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-07-12 10:16:18,290 INFO L271 BasicCegarLoop]: Counterexample is feasible [2022-07-12 10:16:18,290 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (1 of 2 remaining) [2022-07-12 10:16:18,291 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 2 remaining) [2022-07-12 10:16:18,291 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2022-07-12 10:16:18,291 INFO L356 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1] [2022-07-12 10:16:18,291 WARN L231 ceAbstractionStarter]: 6 thread instances were not sufficient, I will increase this number and restart the analysis [2022-07-12 10:16:18,291 INFO L509 ceAbstractionStarter]: Constructing petrified ICFG for 7 thread instances. [2022-07-12 10:16:18,315 INFO L135 ThreadInstanceAdder]: Constructed 7 joinOtherThreadTransitions. [2022-07-12 10:16:18,317 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 292 places, 331 transitions, 760 flow [2022-07-12 10:16:18,696 INFO L129 PetriNetUnfolder]: 530/2772 cut-off events. [2022-07-12 10:16:18,696 INFO L130 PetriNetUnfolder]: For 525/525 co-relation queries the response was YES. [2022-07-12 10:16:18,784 INFO L84 FinitePrefix]: Finished finitePrefix Result has 3270 conditions, 2772 events. 530/2772 cut-off events. For 525/525 co-relation queries the response was YES. Maximal size of possible extension queue 56. Compared 18847 event pairs, 201 based on Foata normal form. 0/2426 useless extension candidates. Maximal degree in co-relation 1771. Up to 448 conditions per place. [2022-07-12 10:16:18,784 INFO L82 GeneralOperation]: Start removeDead. Operand has 292 places, 331 transitions, 760 flow [2022-07-12 10:16:18,808 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 292 places, 331 transitions, 760 flow [2022-07-12 10:16:18,809 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-12 10:16:18,809 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@2db21756, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@16dd23c4 [2022-07-12 10:16:18,809 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-07-12 10:16:18,813 INFO L129 PetriNetUnfolder]: 6/92 cut-off events. [2022-07-12 10:16:18,813 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2022-07-12 10:16:18,814 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:18,814 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:18,814 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:18,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:18,814 INFO L85 PathProgramCache]: Analyzing trace with hash -503281225, now seen corresponding path program 1 times [2022-07-12 10:16:18,814 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:18,814 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2082538877] [2022-07-12 10:16:18,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:18,815 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:18,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:18,824 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:18,824 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:18,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2082538877] [2022-07-12 10:16:18,825 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2082538877] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 10:16:18,825 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 10:16:18,825 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-12 10:16:18,825 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647331124] [2022-07-12 10:16:18,825 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 10:16:18,825 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-07-12 10:16:18,826 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:18,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-07-12 10:16:18,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-07-12 10:16:18,827 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 269 out of 331 [2022-07-12 10:16:18,827 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 292 places, 331 transitions, 760 flow. Second operand has 2 states, 2 states have (on average 269.5) internal successors, (539), 2 states have internal predecessors, (539), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:18,827 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:18,827 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 269 of 331 [2022-07-12 10:16:18,828 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:19,340 INFO L129 PetriNetUnfolder]: 328/2562 cut-off events. [2022-07-12 10:16:19,340 INFO L130 PetriNetUnfolder]: For 1463/1509 co-relation queries the response was YES. [2022-07-12 10:16:19,369 INFO L84 FinitePrefix]: Finished finitePrefix Result has 3516 conditions, 2562 events. 328/2562 cut-off events. For 1463/1509 co-relation queries the response was YES. Maximal size of possible extension queue 53. Compared 18355 event pairs, 201 based on Foata normal form. 2940/5358 useless extension candidates. Maximal degree in co-relation 1834. Up to 456 conditions per place. [2022-07-12 10:16:19,371 INFO L132 encePairwiseOnDemand]: 284/331 looper letters, 7 selfloop transitions, 0 changer transitions 27/283 dead transitions. [2022-07-12 10:16:19,371 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 292 places, 283 transitions, 692 flow [2022-07-12 10:16:19,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-07-12 10:16:19,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2022-07-12 10:16:19,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 599 transitions. [2022-07-12 10:16:19,372 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.904833836858006 [2022-07-12 10:16:19,372 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 599 transitions. [2022-07-12 10:16:19,372 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 599 transitions. [2022-07-12 10:16:19,373 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:19,373 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 599 transitions. [2022-07-12 10:16:19,373 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 299.5) internal successors, (599), 2 states have internal predecessors, (599), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:19,374 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 331.0) internal successors, (993), 3 states have internal predecessors, (993), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:19,374 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 331.0) internal successors, (993), 3 states have internal predecessors, (993), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:19,374 INFO L186 Difference]: Start difference. First operand has 292 places, 331 transitions, 760 flow. Second operand 2 states and 599 transitions. [2022-07-12 10:16:19,374 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 292 places, 283 transitions, 692 flow [2022-07-12 10:16:19,376 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 292 places, 283 transitions, 692 flow, removed 0 selfloop flow, removed 0 redundant places. [2022-07-12 10:16:19,378 INFO L242 Difference]: Finished difference. Result has 292 places, 256 transitions, 589 flow [2022-07-12 10:16:19,378 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=331, PETRI_DIFFERENCE_MINUEND_FLOW=664, PETRI_DIFFERENCE_MINUEND_PLACES=291, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=283, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=283, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=589, PETRI_PLACES=292, PETRI_TRANSITIONS=256} [2022-07-12 10:16:19,379 INFO L279 CegarLoopForPetriNet]: 292 programPoint places, 0 predicate places. [2022-07-12 10:16:19,379 INFO L495 AbstractCegarLoop]: Abstraction has has 292 places, 256 transitions, 589 flow [2022-07-12 10:16:19,379 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 269.5) internal successors, (539), 2 states have internal predecessors, (539), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:19,379 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:19,379 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:19,380 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2022-07-12 10:16:19,380 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:19,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:19,380 INFO L85 PathProgramCache]: Analyzing trace with hash -374198506, now seen corresponding path program 1 times [2022-07-12 10:16:19,380 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:19,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [771595683] [2022-07-12 10:16:19,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:19,381 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:19,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:19,393 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:19,393 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:19,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [771595683] [2022-07-12 10:16:19,393 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [771595683] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 10:16:19,393 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 10:16:19,393 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-12 10:16:19,394 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498949043] [2022-07-12 10:16:19,394 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 10:16:19,394 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-12 10:16:19,394 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:19,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-12 10:16:19,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-12 10:16:19,395 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 262 out of 331 [2022-07-12 10:16:19,396 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 292 places, 256 transitions, 589 flow. Second operand has 3 states, 3 states have (on average 263.0) internal successors, (789), 3 states have internal predecessors, (789), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:19,396 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:19,396 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 262 of 331 [2022-07-12 10:16:19,396 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:19,450 INFO L129 PetriNetUnfolder]: 0/386 cut-off events. [2022-07-12 10:16:19,451 INFO L130 PetriNetUnfolder]: For 77/77 co-relation queries the response was YES. [2022-07-12 10:16:19,451 INFO L84 FinitePrefix]: Finished finitePrefix Result has 484 conditions, 386 events. 0/386 cut-off events. For 77/77 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 1141 event pairs, 0 based on Foata normal form. 0/379 useless extension candidates. Maximal degree in co-relation 0. Up to 42 conditions per place. [2022-07-12 10:16:19,452 INFO L132 encePairwiseOnDemand]: 328/331 looper letters, 16 selfloop transitions, 2 changer transitions 0/260 dead transitions. [2022-07-12 10:16:19,452 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 274 places, 260 transitions, 633 flow [2022-07-12 10:16:19,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-12 10:16:19,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2022-07-12 10:16:19,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 805 transitions. [2022-07-12 10:16:19,453 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.81067472306143 [2022-07-12 10:16:19,453 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 805 transitions. [2022-07-12 10:16:19,453 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 805 transitions. [2022-07-12 10:16:19,454 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:19,454 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 805 transitions. [2022-07-12 10:16:19,458 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 268.3333333333333) internal successors, (805), 3 states have internal predecessors, (805), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:19,459 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 331.0) internal successors, (1324), 4 states have internal predecessors, (1324), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:19,459 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 331.0) internal successors, (1324), 4 states have internal predecessors, (1324), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:19,459 INFO L186 Difference]: Start difference. First operand has 292 places, 256 transitions, 589 flow. Second operand 3 states and 805 transitions. [2022-07-12 10:16:19,459 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 274 places, 260 transitions, 633 flow [2022-07-12 10:16:19,461 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 274 places, 260 transitions, 591 flow, removed 21 selfloop flow, removed 0 redundant places. [2022-07-12 10:16:19,463 INFO L242 Difference]: Finished difference. Result has 275 places, 257 transitions, 559 flow [2022-07-12 10:16:19,463 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=331, PETRI_DIFFERENCE_MINUEND_FLOW=547, PETRI_DIFFERENCE_MINUEND_PLACES=272, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=256, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=254, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=559, PETRI_PLACES=275, PETRI_TRANSITIONS=257} [2022-07-12 10:16:19,464 INFO L279 CegarLoopForPetriNet]: 292 programPoint places, -17 predicate places. [2022-07-12 10:16:19,464 INFO L495 AbstractCegarLoop]: Abstraction has has 275 places, 257 transitions, 559 flow [2022-07-12 10:16:19,464 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 263.0) internal successors, (789), 3 states have internal predecessors, (789), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:19,464 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:19,464 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:19,464 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2022-07-12 10:16:19,464 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:19,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:19,465 INFO L85 PathProgramCache]: Analyzing trace with hash 2046781316, now seen corresponding path program 1 times [2022-07-12 10:16:19,465 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:19,465 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1193755448] [2022-07-12 10:16:19,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:19,465 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:19,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:19,489 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:19,490 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:19,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1193755448] [2022-07-12 10:16:19,490 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1193755448] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 10:16:19,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [275160540] [2022-07-12 10:16:19,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:19,490 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:19,491 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 10:16:19,492 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 10:16:19,511 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-07-12 10:16:19,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:19,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 4 conjunts are in the unsatisfiable core [2022-07-12 10:16:19,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 10:16:19,620 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:19,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 10:16:19,647 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:19,647 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [275160540] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 10:16:19,647 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 10:16:19,647 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2022-07-12 10:16:19,647 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520477341] [2022-07-12 10:16:19,648 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 10:16:19,648 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-12 10:16:19,648 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:19,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-12 10:16:19,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-07-12 10:16:19,650 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 261 out of 331 [2022-07-12 10:16:19,651 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 275 places, 257 transitions, 559 flow. Second operand has 10 states, 10 states have (on average 263.3) internal successors, (2633), 10 states have internal predecessors, (2633), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:19,651 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:19,652 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 261 of 331 [2022-07-12 10:16:19,652 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:19,743 INFO L129 PetriNetUnfolder]: 0/362 cut-off events. [2022-07-12 10:16:19,744 INFO L130 PetriNetUnfolder]: For 9/9 co-relation queries the response was YES. [2022-07-12 10:16:19,744 INFO L84 FinitePrefix]: Finished finitePrefix Result has 460 conditions, 362 events. 0/362 cut-off events. For 9/9 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 996 event pairs, 0 based on Foata normal form. 2/364 useless extension candidates. Maximal degree in co-relation 0. Up to 23 conditions per place. [2022-07-12 10:16:19,745 INFO L132 encePairwiseOnDemand]: 325/331 looper letters, 17 selfloop transitions, 9 changer transitions 0/267 dead transitions. [2022-07-12 10:16:19,745 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 283 places, 267 transitions, 633 flow [2022-07-12 10:16:19,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-12 10:16:19,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2022-07-12 10:16:19,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 2377 transitions. [2022-07-12 10:16:19,747 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.7979187646861363 [2022-07-12 10:16:19,747 INFO L72 ComplementDD]: Start complementDD. Operand 9 states and 2377 transitions. [2022-07-12 10:16:19,748 INFO L73 IsDeterministic]: Start isDeterministic. Operand 9 states and 2377 transitions. [2022-07-12 10:16:19,748 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:19,748 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 9 states and 2377 transitions. [2022-07-12 10:16:19,751 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 10 states, 9 states have (on average 264.1111111111111) internal successors, (2377), 9 states have internal predecessors, (2377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:19,753 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 10 states, 10 states have (on average 331.0) internal successors, (3310), 10 states have internal predecessors, (3310), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:19,753 INFO L81 ComplementDD]: Finished complementDD. Result has 10 states, 10 states have (on average 331.0) internal successors, (3310), 10 states have internal predecessors, (3310), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:19,753 INFO L186 Difference]: Start difference. First operand has 275 places, 257 transitions, 559 flow. Second operand 9 states and 2377 transitions. [2022-07-12 10:16:19,754 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 283 places, 267 transitions, 633 flow [2022-07-12 10:16:19,755 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 282 places, 267 transitions, 631 flow, removed 0 selfloop flow, removed 1 redundant places. [2022-07-12 10:16:19,757 INFO L242 Difference]: Finished difference. Result has 285 places, 263 transitions, 607 flow [2022-07-12 10:16:19,758 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=331, PETRI_DIFFERENCE_MINUEND_FLOW=557, PETRI_DIFFERENCE_MINUEND_PLACES=274, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=257, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=251, PETRI_DIFFERENCE_SUBTRAHEND_STATES=9, PETRI_FLOW=607, PETRI_PLACES=285, PETRI_TRANSITIONS=263} [2022-07-12 10:16:19,758 INFO L279 CegarLoopForPetriNet]: 292 programPoint places, -7 predicate places. [2022-07-12 10:16:19,758 INFO L495 AbstractCegarLoop]: Abstraction has has 285 places, 263 transitions, 607 flow [2022-07-12 10:16:19,759 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 263.3) internal successors, (2633), 10 states have internal predecessors, (2633), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:19,759 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:19,759 INFO L200 CegarLoopForPetriNet]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:19,778 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-07-12 10:16:19,975 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-07-12 10:16:19,976 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:19,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:19,976 INFO L85 PathProgramCache]: Analyzing trace with hash -1868894339, now seen corresponding path program 1 times [2022-07-12 10:16:19,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:19,976 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426696239] [2022-07-12 10:16:19,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:19,977 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:19,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:20,020 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:20,021 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:20,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [426696239] [2022-07-12 10:16:20,021 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [426696239] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 10:16:20,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [389987749] [2022-07-12 10:16:20,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:20,021 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:20,021 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 10:16:20,023 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 10:16:20,046 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-07-12 10:16:20,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:20,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 8 conjunts are in the unsatisfiable core [2022-07-12 10:16:20,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 10:16:20,181 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:20,182 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 10:16:20,252 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:20,252 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [389987749] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 10:16:20,252 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 10:16:20,252 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 18 [2022-07-12 10:16:20,252 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303259772] [2022-07-12 10:16:20,253 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 10:16:20,253 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-07-12 10:16:20,253 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:20,254 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-07-12 10:16:20,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2022-07-12 10:16:20,257 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 261 out of 331 [2022-07-12 10:16:20,260 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 285 places, 263 transitions, 607 flow. Second operand has 18 states, 18 states have (on average 263.6111111111111) internal successors, (4745), 18 states have internal predecessors, (4745), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:20,260 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:20,260 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 261 of 331 [2022-07-12 10:16:20,260 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:20,439 INFO L129 PetriNetUnfolder]: 0/314 cut-off events. [2022-07-12 10:16:20,439 INFO L130 PetriNetUnfolder]: For 36/36 co-relation queries the response was YES. [2022-07-12 10:16:20,439 INFO L84 FinitePrefix]: Finished finitePrefix Result has 449 conditions, 314 events. 0/314 cut-off events. For 36/36 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 670 event pairs, 0 based on Foata normal form. 4/318 useless extension candidates. Maximal degree in co-relation 0. Up to 11 conditions per place. [2022-07-12 10:16:20,440 INFO L132 encePairwiseOnDemand]: 325/331 looper letters, 25 selfloop transitions, 21 changer transitions 0/287 dead transitions. [2022-07-12 10:16:20,440 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 305 places, 287 transitions, 807 flow [2022-07-12 10:16:20,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-07-12 10:16:20,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2022-07-12 10:16:20,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 5531 transitions. [2022-07-12 10:16:20,445 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.7957128470723637 [2022-07-12 10:16:20,445 INFO L72 ComplementDD]: Start complementDD. Operand 21 states and 5531 transitions. [2022-07-12 10:16:20,445 INFO L73 IsDeterministic]: Start isDeterministic. Operand 21 states and 5531 transitions. [2022-07-12 10:16:20,446 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:20,446 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 21 states and 5531 transitions. [2022-07-12 10:16:20,452 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 22 states, 21 states have (on average 263.3809523809524) internal successors, (5531), 21 states have internal predecessors, (5531), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:20,457 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 22 states, 22 states have (on average 331.0) internal successors, (7282), 22 states have internal predecessors, (7282), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:20,458 INFO L81 ComplementDD]: Finished complementDD. Result has 22 states, 22 states have (on average 331.0) internal successors, (7282), 22 states have internal predecessors, (7282), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:20,458 INFO L186 Difference]: Start difference. First operand has 285 places, 263 transitions, 607 flow. Second operand 21 states and 5531 transitions. [2022-07-12 10:16:20,459 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 305 places, 287 transitions, 807 flow [2022-07-12 10:16:20,461 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 304 places, 287 transitions, 793 flow, removed 6 selfloop flow, removed 1 redundant places. [2022-07-12 10:16:20,463 INFO L242 Difference]: Finished difference. Result has 309 places, 276 transitions, 731 flow [2022-07-12 10:16:20,463 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=331, PETRI_DIFFERENCE_MINUEND_FLOW=601, PETRI_DIFFERENCE_MINUEND_PLACES=284, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=263, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=10, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=252, PETRI_DIFFERENCE_SUBTRAHEND_STATES=21, PETRI_FLOW=731, PETRI_PLACES=309, PETRI_TRANSITIONS=276} [2022-07-12 10:16:20,464 INFO L279 CegarLoopForPetriNet]: 292 programPoint places, 17 predicate places. [2022-07-12 10:16:20,464 INFO L495 AbstractCegarLoop]: Abstraction has has 309 places, 276 transitions, 731 flow [2022-07-12 10:16:20,465 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 263.6111111111111) internal successors, (4745), 18 states have internal predecessors, (4745), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:20,465 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:20,465 INFO L200 CegarLoopForPetriNet]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:20,489 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-07-12 10:16:20,682 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-07-12 10:16:20,682 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:20,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:20,683 INFO L85 PathProgramCache]: Analyzing trace with hash -211923103, now seen corresponding path program 1 times [2022-07-12 10:16:20,683 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:20,683 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1772685157] [2022-07-12 10:16:20,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:20,683 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:20,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-12 10:16:20,697 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-07-12 10:16:20,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-12 10:16:20,722 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-07-12 10:16:20,722 INFO L271 BasicCegarLoop]: Counterexample is feasible [2022-07-12 10:16:20,722 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (1 of 2 remaining) [2022-07-12 10:16:20,722 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 2 remaining) [2022-07-12 10:16:20,722 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2022-07-12 10:16:20,722 INFO L356 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1] [2022-07-12 10:16:20,723 WARN L231 ceAbstractionStarter]: 7 thread instances were not sufficient, I will increase this number and restart the analysis [2022-07-12 10:16:20,723 INFO L509 ceAbstractionStarter]: Constructing petrified ICFG for 8 thread instances. [2022-07-12 10:16:20,741 INFO L135 ThreadInstanceAdder]: Constructed 8 joinOtherThreadTransitions. [2022-07-12 10:16:20,743 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 322 places, 366 transitions, 852 flow [2022-07-12 10:16:21,618 INFO L129 PetriNetUnfolder]: 1117/5207 cut-off events. [2022-07-12 10:16:21,618 INFO L130 PetriNetUnfolder]: For 1136/1136 co-relation queries the response was YES. [2022-07-12 10:16:21,724 INFO L84 FinitePrefix]: Finished finitePrefix Result has 6292 conditions, 5207 events. 1117/5207 cut-off events. For 1136/1136 co-relation queries the response was YES. Maximal size of possible extension queue 102. Compared 42187 event pairs, 522 based on Foata normal form. 0/4593 useless extension candidates. Maximal degree in co-relation 3254. Up to 1024 conditions per place. [2022-07-12 10:16:21,725 INFO L82 GeneralOperation]: Start removeDead. Operand has 322 places, 366 transitions, 852 flow [2022-07-12 10:16:21,789 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 322 places, 366 transitions, 852 flow [2022-07-12 10:16:21,790 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-12 10:16:21,790 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@2db21756, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@16dd23c4 [2022-07-12 10:16:21,790 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-07-12 10:16:21,794 INFO L129 PetriNetUnfolder]: 3/86 cut-off events. [2022-07-12 10:16:21,794 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2022-07-12 10:16:21,794 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:21,795 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:21,795 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:21,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:21,795 INFO L85 PathProgramCache]: Analyzing trace with hash -1281244809, now seen corresponding path program 1 times [2022-07-12 10:16:21,795 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:21,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1559581131] [2022-07-12 10:16:21,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:21,796 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:21,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:21,805 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:21,806 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:21,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1559581131] [2022-07-12 10:16:21,806 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1559581131] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 10:16:21,806 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 10:16:21,806 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-12 10:16:21,806 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779121825] [2022-07-12 10:16:21,806 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 10:16:21,807 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-07-12 10:16:21,807 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:21,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-07-12 10:16:21,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-07-12 10:16:21,808 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 296 out of 366 [2022-07-12 10:16:21,808 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 322 places, 366 transitions, 852 flow. Second operand has 2 states, 2 states have (on average 296.5) internal successors, (593), 2 states have internal predecessors, (593), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:21,808 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:21,809 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 296 of 366 [2022-07-12 10:16:21,809 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:22,781 INFO L129 PetriNetUnfolder]: 777/4858 cut-off events. [2022-07-12 10:16:22,781 INFO L130 PetriNetUnfolder]: For 3236/3290 co-relation queries the response was YES. [2022-07-12 10:16:22,812 INFO L84 FinitePrefix]: Finished finitePrefix Result has 6976 conditions, 4858 events. 777/4858 cut-off events. For 3236/3290 co-relation queries the response was YES. Maximal size of possible extension queue 99. Compared 40525 event pairs, 522 based on Foata normal form. 6564/11148 useless extension candidates. Maximal degree in co-relation 3499. Up to 1033 conditions per place. [2022-07-12 10:16:22,815 INFO L132 encePairwiseOnDemand]: 313/366 looper letters, 8 selfloop transitions, 0 changer transitions 28/312 dead transitions. [2022-07-12 10:16:22,815 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 322 places, 312 transitions, 776 flow [2022-07-12 10:16:22,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-07-12 10:16:22,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2022-07-12 10:16:22,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 661 transitions. [2022-07-12 10:16:22,816 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.9030054644808743 [2022-07-12 10:16:22,817 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 661 transitions. [2022-07-12 10:16:22,817 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 661 transitions. [2022-07-12 10:16:22,817 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:22,817 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 661 transitions. [2022-07-12 10:16:22,818 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 330.5) internal successors, (661), 2 states have internal predecessors, (661), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:22,818 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 366.0) internal successors, (1098), 3 states have internal predecessors, (1098), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:22,819 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 366.0) internal successors, (1098), 3 states have internal predecessors, (1098), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:22,819 INFO L186 Difference]: Start difference. First operand has 322 places, 366 transitions, 852 flow. Second operand 2 states and 661 transitions. [2022-07-12 10:16:22,819 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 322 places, 312 transitions, 776 flow [2022-07-12 10:16:22,821 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 322 places, 312 transitions, 776 flow, removed 0 selfloop flow, removed 0 redundant places. [2022-07-12 10:16:22,823 INFO L242 Difference]: Finished difference. Result has 322 places, 284 transitions, 664 flow [2022-07-12 10:16:22,826 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=366, PETRI_DIFFERENCE_MINUEND_FLOW=744, PETRI_DIFFERENCE_MINUEND_PLACES=321, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=312, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=312, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=664, PETRI_PLACES=322, PETRI_TRANSITIONS=284} [2022-07-12 10:16:22,826 INFO L279 CegarLoopForPetriNet]: 322 programPoint places, 0 predicate places. [2022-07-12 10:16:22,827 INFO L495 AbstractCegarLoop]: Abstraction has has 322 places, 284 transitions, 664 flow [2022-07-12 10:16:22,827 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 296.5) internal successors, (593), 2 states have internal predecessors, (593), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:22,827 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:22,827 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:22,827 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2022-07-12 10:16:22,827 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:22,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:22,828 INFO L85 PathProgramCache]: Analyzing trace with hash -1152162090, now seen corresponding path program 1 times [2022-07-12 10:16:22,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:22,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [684930655] [2022-07-12 10:16:22,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:22,828 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:22,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:22,841 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:22,841 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:22,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [684930655] [2022-07-12 10:16:22,842 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [684930655] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 10:16:22,842 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 10:16:22,842 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-12 10:16:22,842 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328429648] [2022-07-12 10:16:22,842 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 10:16:22,842 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-12 10:16:22,842 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:22,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-12 10:16:22,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-12 10:16:22,843 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 289 out of 366 [2022-07-12 10:16:22,844 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 322 places, 284 transitions, 664 flow. Second operand has 3 states, 3 states have (on average 290.0) internal successors, (870), 3 states have internal predecessors, (870), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:22,844 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:22,844 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 289 of 366 [2022-07-12 10:16:22,844 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:22,915 INFO L129 PetriNetUnfolder]: 0/435 cut-off events. [2022-07-12 10:16:22,915 INFO L130 PetriNetUnfolder]: For 112/112 co-relation queries the response was YES. [2022-07-12 10:16:22,916 INFO L84 FinitePrefix]: Finished finitePrefix Result has 550 conditions, 435 events. 0/435 cut-off events. For 112/112 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 1324 event pairs, 0 based on Foata normal form. 0/427 useless extension candidates. Maximal degree in co-relation 0. Up to 48 conditions per place. [2022-07-12 10:16:22,917 INFO L132 encePairwiseOnDemand]: 363/366 looper letters, 17 selfloop transitions, 2 changer transitions 0/288 dead transitions. [2022-07-12 10:16:22,917 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 304 places, 288 transitions, 710 flow [2022-07-12 10:16:22,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-12 10:16:22,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2022-07-12 10:16:22,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 887 transitions. [2022-07-12 10:16:22,918 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.807832422586521 [2022-07-12 10:16:22,918 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 887 transitions. [2022-07-12 10:16:22,918 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 887 transitions. [2022-07-12 10:16:22,919 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:22,919 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 887 transitions. [2022-07-12 10:16:22,920 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 295.6666666666667) internal successors, (887), 3 states have internal predecessors, (887), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:22,921 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 366.0) internal successors, (1464), 4 states have internal predecessors, (1464), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:22,922 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 366.0) internal successors, (1464), 4 states have internal predecessors, (1464), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:22,922 INFO L186 Difference]: Start difference. First operand has 322 places, 284 transitions, 664 flow. Second operand 3 states and 887 transitions. [2022-07-12 10:16:22,922 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 304 places, 288 transitions, 710 flow [2022-07-12 10:16:22,924 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 304 places, 288 transitions, 654 flow, removed 28 selfloop flow, removed 0 redundant places. [2022-07-12 10:16:22,927 INFO L242 Difference]: Finished difference. Result has 305 places, 285 transitions, 620 flow [2022-07-12 10:16:22,927 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=366, PETRI_DIFFERENCE_MINUEND_FLOW=608, PETRI_DIFFERENCE_MINUEND_PLACES=302, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=284, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=282, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=620, PETRI_PLACES=305, PETRI_TRANSITIONS=285} [2022-07-12 10:16:22,927 INFO L279 CegarLoopForPetriNet]: 322 programPoint places, -17 predicate places. [2022-07-12 10:16:22,927 INFO L495 AbstractCegarLoop]: Abstraction has has 305 places, 285 transitions, 620 flow [2022-07-12 10:16:22,928 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 290.0) internal successors, (870), 3 states have internal predecessors, (870), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:22,928 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:22,928 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:22,928 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2022-07-12 10:16:22,928 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:22,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:22,929 INFO L85 PathProgramCache]: Analyzing trace with hash -2140628477, now seen corresponding path program 1 times [2022-07-12 10:16:22,929 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:22,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1979710628] [2022-07-12 10:16:22,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:22,929 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:22,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:22,950 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:22,951 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:22,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1979710628] [2022-07-12 10:16:22,951 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1979710628] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 10:16:22,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1641793989] [2022-07-12 10:16:22,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:22,951 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:22,951 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 10:16:22,952 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 10:16:22,977 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-07-12 10:16:23,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:23,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 4 conjunts are in the unsatisfiable core [2022-07-12 10:16:23,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 10:16:23,078 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:23,078 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 10:16:23,099 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:23,099 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1641793989] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 10:16:23,099 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 10:16:23,099 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2022-07-12 10:16:23,099 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788734323] [2022-07-12 10:16:23,099 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 10:16:23,100 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-12 10:16:23,100 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:23,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-12 10:16:23,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-07-12 10:16:23,102 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 288 out of 366 [2022-07-12 10:16:23,103 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 305 places, 285 transitions, 620 flow. Second operand has 10 states, 10 states have (on average 290.3) internal successors, (2903), 10 states have internal predecessors, (2903), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:23,103 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:23,104 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 288 of 366 [2022-07-12 10:16:23,104 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:23,198 INFO L129 PetriNetUnfolder]: 0/411 cut-off events. [2022-07-12 10:16:23,198 INFO L130 PetriNetUnfolder]: For 10/10 co-relation queries the response was YES. [2022-07-12 10:16:23,198 INFO L84 FinitePrefix]: Finished finitePrefix Result has 522 conditions, 411 events. 0/411 cut-off events. For 10/10 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 1180 event pairs, 0 based on Foata normal form. 2/413 useless extension candidates. Maximal degree in co-relation 0. Up to 27 conditions per place. [2022-07-12 10:16:23,199 INFO L132 encePairwiseOnDemand]: 360/366 looper letters, 18 selfloop transitions, 9 changer transitions 0/295 dead transitions. [2022-07-12 10:16:23,199 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 313 places, 295 transitions, 696 flow [2022-07-12 10:16:23,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-12 10:16:23,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2022-07-12 10:16:23,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 2621 transitions. [2022-07-12 10:16:23,201 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.7956891317547056 [2022-07-12 10:16:23,201 INFO L72 ComplementDD]: Start complementDD. Operand 9 states and 2621 transitions. [2022-07-12 10:16:23,201 INFO L73 IsDeterministic]: Start isDeterministic. Operand 9 states and 2621 transitions. [2022-07-12 10:16:23,202 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:23,202 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 9 states and 2621 transitions. [2022-07-12 10:16:23,204 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 10 states, 9 states have (on average 291.22222222222223) internal successors, (2621), 9 states have internal predecessors, (2621), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:23,206 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 10 states, 10 states have (on average 366.0) internal successors, (3660), 10 states have internal predecessors, (3660), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:23,207 INFO L81 ComplementDD]: Finished complementDD. Result has 10 states, 10 states have (on average 366.0) internal successors, (3660), 10 states have internal predecessors, (3660), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:23,207 INFO L186 Difference]: Start difference. First operand has 305 places, 285 transitions, 620 flow. Second operand 9 states and 2621 transitions. [2022-07-12 10:16:23,207 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 313 places, 295 transitions, 696 flow [2022-07-12 10:16:23,208 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 312 places, 295 transitions, 694 flow, removed 0 selfloop flow, removed 1 redundant places. [2022-07-12 10:16:23,211 INFO L242 Difference]: Finished difference. Result has 315 places, 291 transitions, 668 flow [2022-07-12 10:16:23,211 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=366, PETRI_DIFFERENCE_MINUEND_FLOW=618, PETRI_DIFFERENCE_MINUEND_PLACES=304, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=285, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=279, PETRI_DIFFERENCE_SUBTRAHEND_STATES=9, PETRI_FLOW=668, PETRI_PLACES=315, PETRI_TRANSITIONS=291} [2022-07-12 10:16:23,211 INFO L279 CegarLoopForPetriNet]: 322 programPoint places, -7 predicate places. [2022-07-12 10:16:23,211 INFO L495 AbstractCegarLoop]: Abstraction has has 315 places, 291 transitions, 668 flow [2022-07-12 10:16:23,212 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 290.3) internal successors, (2903), 10 states have internal predecessors, (2903), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:23,212 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:23,212 INFO L200 CegarLoopForPetriNet]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:23,237 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-07-12 10:16:23,427 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2022-07-12 10:16:23,428 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:23,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:23,428 INFO L85 PathProgramCache]: Analyzing trace with hash -43835590, now seen corresponding path program 1 times [2022-07-12 10:16:23,428 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:23,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1175997693] [2022-07-12 10:16:23,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:23,428 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:23,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:23,470 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:23,471 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:23,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1175997693] [2022-07-12 10:16:23,471 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1175997693] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 10:16:23,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [655616706] [2022-07-12 10:16:23,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:23,471 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:23,471 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 10:16:23,472 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 10:16:23,473 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-07-12 10:16:23,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:23,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 8 conjunts are in the unsatisfiable core [2022-07-12 10:16:23,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 10:16:23,651 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:23,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 10:16:23,724 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:23,724 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [655616706] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 10:16:23,725 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 10:16:23,725 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 18 [2022-07-12 10:16:23,725 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326033197] [2022-07-12 10:16:23,725 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 10:16:23,726 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-07-12 10:16:23,727 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:23,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-07-12 10:16:23,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2022-07-12 10:16:23,730 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 288 out of 366 [2022-07-12 10:16:23,732 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 315 places, 291 transitions, 668 flow. Second operand has 18 states, 18 states have (on average 290.6111111111111) internal successors, (5231), 18 states have internal predecessors, (5231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:23,732 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:23,732 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 288 of 366 [2022-07-12 10:16:23,732 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:24,030 INFO L129 PetriNetUnfolder]: 0/363 cut-off events. [2022-07-12 10:16:24,030 INFO L130 PetriNetUnfolder]: For 42/42 co-relation queries the response was YES. [2022-07-12 10:16:24,031 INFO L84 FinitePrefix]: Finished finitePrefix Result has 519 conditions, 363 events. 0/363 cut-off events. For 42/42 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 856 event pairs, 0 based on Foata normal form. 4/367 useless extension candidates. Maximal degree in co-relation 0. Up to 13 conditions per place. [2022-07-12 10:16:24,032 INFO L132 encePairwiseOnDemand]: 360/366 looper letters, 26 selfloop transitions, 21 changer transitions 0/315 dead transitions. [2022-07-12 10:16:24,032 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 335 places, 315 transitions, 870 flow [2022-07-12 10:16:24,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-07-12 10:16:24,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2022-07-12 10:16:24,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 6099 transitions. [2022-07-12 10:16:24,039 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.7935206869633099 [2022-07-12 10:16:24,039 INFO L72 ComplementDD]: Start complementDD. Operand 21 states and 6099 transitions. [2022-07-12 10:16:24,039 INFO L73 IsDeterministic]: Start isDeterministic. Operand 21 states and 6099 transitions. [2022-07-12 10:16:24,040 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:24,041 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 21 states and 6099 transitions. [2022-07-12 10:16:24,049 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 22 states, 21 states have (on average 290.42857142857144) internal successors, (6099), 21 states have internal predecessors, (6099), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:24,057 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 22 states, 22 states have (on average 366.0) internal successors, (8052), 22 states have internal predecessors, (8052), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:24,058 INFO L81 ComplementDD]: Finished complementDD. Result has 22 states, 22 states have (on average 366.0) internal successors, (8052), 22 states have internal predecessors, (8052), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:24,058 INFO L186 Difference]: Start difference. First operand has 315 places, 291 transitions, 668 flow. Second operand 21 states and 6099 transitions. [2022-07-12 10:16:24,058 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 335 places, 315 transitions, 870 flow [2022-07-12 10:16:24,061 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 334 places, 315 transitions, 856 flow, removed 6 selfloop flow, removed 1 redundant places. [2022-07-12 10:16:24,065 INFO L242 Difference]: Finished difference. Result has 339 places, 304 transitions, 792 flow [2022-07-12 10:16:24,065 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=366, PETRI_DIFFERENCE_MINUEND_FLOW=662, PETRI_DIFFERENCE_MINUEND_PLACES=314, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=291, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=10, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=280, PETRI_DIFFERENCE_SUBTRAHEND_STATES=21, PETRI_FLOW=792, PETRI_PLACES=339, PETRI_TRANSITIONS=304} [2022-07-12 10:16:24,065 INFO L279 CegarLoopForPetriNet]: 322 programPoint places, 17 predicate places. [2022-07-12 10:16:24,066 INFO L495 AbstractCegarLoop]: Abstraction has has 339 places, 304 transitions, 792 flow [2022-07-12 10:16:24,067 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 290.6111111111111) internal successors, (5231), 18 states have internal predecessors, (5231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:24,067 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:24,067 INFO L200 CegarLoopForPetriNet]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:24,095 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-07-12 10:16:24,283 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2022-07-12 10:16:24,283 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:24,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:24,284 INFO L85 PathProgramCache]: Analyzing trace with hash 1497810972, now seen corresponding path program 1 times [2022-07-12 10:16:24,284 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:24,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1964714706] [2022-07-12 10:16:24,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:24,284 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:24,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:24,402 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 0 proven. 217 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:24,402 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:24,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1964714706] [2022-07-12 10:16:24,403 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1964714706] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 10:16:24,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1609652200] [2022-07-12 10:16:24,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:24,403 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:24,403 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 10:16:24,404 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 10:16:24,405 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-07-12 10:16:24,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:24,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 16 conjunts are in the unsatisfiable core [2022-07-12 10:16:24,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 10:16:24,636 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 0 proven. 217 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:24,637 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 10:16:24,880 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 0 proven. 217 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:24,881 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1609652200] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 10:16:24,881 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 10:16:24,881 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 34 [2022-07-12 10:16:24,881 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160125574] [2022-07-12 10:16:24,881 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 10:16:24,881 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-07-12 10:16:24,881 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:24,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-07-12 10:16:24,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=816, Unknown=0, NotChecked=0, Total=1122 [2022-07-12 10:16:24,887 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 288 out of 366 [2022-07-12 10:16:24,892 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 339 places, 304 transitions, 792 flow. Second operand has 34 states, 34 states have (on average 290.79411764705884) internal successors, (9887), 34 states have internal predecessors, (9887), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:24,892 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:24,892 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 288 of 366 [2022-07-12 10:16:24,892 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:25,198 INFO L129 PetriNetUnfolder]: 0/339 cut-off events. [2022-07-12 10:16:25,198 INFO L130 PetriNetUnfolder]: For 87/87 co-relation queries the response was YES. [2022-07-12 10:16:25,198 INFO L84 FinitePrefix]: Finished finitePrefix Result has 523 conditions, 339 events. 0/339 cut-off events. For 87/87 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 717 event pairs, 0 based on Foata normal form. 2/341 useless extension candidates. Maximal degree in co-relation 0. Up to 13 conditions per place. [2022-07-12 10:16:25,199 INFO L132 encePairwiseOnDemand]: 361/366 looper letters, 27 selfloop transitions, 25 changer transitions 0/309 dead transitions. [2022-07-12 10:16:25,199 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 353 places, 309 transitions, 938 flow [2022-07-12 10:16:25,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-07-12 10:16:25,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2022-07-12 10:16:25,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 7830 transitions. [2022-07-12 10:16:25,206 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.7923497267759563 [2022-07-12 10:16:25,206 INFO L72 ComplementDD]: Start complementDD. Operand 27 states and 7830 transitions. [2022-07-12 10:16:25,206 INFO L73 IsDeterministic]: Start isDeterministic. Operand 27 states and 7830 transitions. [2022-07-12 10:16:25,207 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:25,208 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 27 states and 7830 transitions. [2022-07-12 10:16:25,215 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 28 states, 27 states have (on average 290.0) internal successors, (7830), 27 states have internal predecessors, (7830), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:25,223 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 28 states, 28 states have (on average 366.0) internal successors, (10248), 28 states have internal predecessors, (10248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:25,224 INFO L81 ComplementDD]: Finished complementDD. Result has 28 states, 28 states have (on average 366.0) internal successors, (10248), 28 states have internal predecessors, (10248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:25,224 INFO L186 Difference]: Start difference. First operand has 339 places, 304 transitions, 792 flow. Second operand 27 states and 7830 transitions. [2022-07-12 10:16:25,224 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 353 places, 309 transitions, 938 flow [2022-07-12 10:16:25,226 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 340 places, 309 transitions, 884 flow, removed 7 selfloop flow, removed 13 redundant places. [2022-07-12 10:16:25,229 INFO L242 Difference]: Finished difference. Result has 340 places, 295 transitions, 777 flow [2022-07-12 10:16:25,229 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=366, PETRI_DIFFERENCE_MINUEND_FLOW=709, PETRI_DIFFERENCE_MINUEND_PLACES=314, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=292, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=22, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=270, PETRI_DIFFERENCE_SUBTRAHEND_STATES=27, PETRI_FLOW=777, PETRI_PLACES=340, PETRI_TRANSITIONS=295} [2022-07-12 10:16:25,230 INFO L279 CegarLoopForPetriNet]: 322 programPoint places, 18 predicate places. [2022-07-12 10:16:25,230 INFO L495 AbstractCegarLoop]: Abstraction has has 340 places, 295 transitions, 777 flow [2022-07-12 10:16:25,231 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 290.79411764705884) internal successors, (9887), 34 states have internal predecessors, (9887), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:25,231 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:25,231 INFO L200 CegarLoopForPetriNet]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:25,250 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-07-12 10:16:25,449 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-07-12 10:16:25,449 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:25,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:25,449 INFO L85 PathProgramCache]: Analyzing trace with hash -1001118447, now seen corresponding path program 1 times [2022-07-12 10:16:25,449 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:25,449 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [816742177] [2022-07-12 10:16:25,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:25,449 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:25,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-12 10:16:25,467 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-07-12 10:16:25,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-12 10:16:25,487 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-07-12 10:16:25,488 INFO L271 BasicCegarLoop]: Counterexample is feasible [2022-07-12 10:16:25,488 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (1 of 2 remaining) [2022-07-12 10:16:25,488 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 2 remaining) [2022-07-12 10:16:25,488 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2022-07-12 10:16:25,488 INFO L356 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1] [2022-07-12 10:16:25,489 WARN L231 ceAbstractionStarter]: 8 thread instances were not sufficient, I will increase this number and restart the analysis [2022-07-12 10:16:25,489 INFO L509 ceAbstractionStarter]: Constructing petrified ICFG for 9 thread instances. [2022-07-12 10:16:25,515 INFO L135 ThreadInstanceAdder]: Constructed 9 joinOtherThreadTransitions. [2022-07-12 10:16:25,518 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 352 places, 401 transitions, 946 flow [2022-07-12 10:16:27,329 INFO L129 PetriNetUnfolder]: 2408/10138 cut-off events. [2022-07-12 10:16:27,329 INFO L130 PetriNetUnfolder]: For 2460/2460 co-relation queries the response was YES. [2022-07-12 10:16:27,538 INFO L84 FinitePrefix]: Finished finitePrefix Result has 12515 conditions, 10138 events. 2408/10138 cut-off events. For 2460/2460 co-relation queries the response was YES. Maximal size of possible extension queue 203. Compared 94154 event pairs, 1291 based on Foata normal form. 0/9000 useless extension candidates. Maximal degree in co-relation 6274. Up to 2304 conditions per place. [2022-07-12 10:16:27,538 INFO L82 GeneralOperation]: Start removeDead. Operand has 352 places, 401 transitions, 946 flow [2022-07-12 10:16:27,658 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 352 places, 401 transitions, 946 flow [2022-07-12 10:16:27,659 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-12 10:16:27,664 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@2db21756, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@16dd23c4 [2022-07-12 10:16:27,664 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-07-12 10:16:27,667 INFO L129 PetriNetUnfolder]: 5/90 cut-off events. [2022-07-12 10:16:27,667 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2022-07-12 10:16:27,668 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:27,668 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:27,668 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:27,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:27,668 INFO L85 PathProgramCache]: Analyzing trace with hash 823585782, now seen corresponding path program 1 times [2022-07-12 10:16:27,668 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:27,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [301807496] [2022-07-12 10:16:27,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:27,669 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:27,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:27,681 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:27,681 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:27,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [301807496] [2022-07-12 10:16:27,681 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [301807496] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 10:16:27,682 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 10:16:27,682 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-12 10:16:27,682 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74007083] [2022-07-12 10:16:27,682 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 10:16:27,682 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-12 10:16:27,682 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:27,682 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-12 10:16:27,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-12 10:16:27,684 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 316 out of 401 [2022-07-12 10:16:27,684 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 352 places, 401 transitions, 946 flow. Second operand has 3 states, 3 states have (on average 317.0) internal successors, (951), 3 states have internal predecessors, (951), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:27,684 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:27,684 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 316 of 401 [2022-07-12 10:16:27,684 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:29,970 INFO L129 PetriNetUnfolder]: 1801/9503 cut-off events. [2022-07-12 10:16:29,971 INFO L130 PetriNetUnfolder]: For 7080/7247 co-relation queries the response was YES. [2022-07-12 10:16:30,103 INFO L84 FinitePrefix]: Finished finitePrefix Result has 14243 conditions, 9503 events. 1801/9503 cut-off events. For 7080/7247 co-relation queries the response was YES. Maximal size of possible extension queue 189. Compared 91846 event pairs, 1291 based on Foata normal form. 15563/24536 useless extension candidates. Maximal degree in co-relation 6987. Up to 2358 conditions per place. [2022-07-12 10:16:30,108 INFO L132 encePairwiseOnDemand]: 339/401 looper letters, 18 selfloop transitions, 2 changer transitions 29/345 dead transitions. [2022-07-12 10:16:30,108 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 353 places, 345 transitions, 892 flow [2022-07-12 10:16:30,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-12 10:16:30,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2022-07-12 10:16:30,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 1044 transitions. [2022-07-12 10:16:30,110 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.8678304239401496 [2022-07-12 10:16:30,110 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 1044 transitions. [2022-07-12 10:16:30,110 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 1044 transitions. [2022-07-12 10:16:30,110 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:30,110 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 1044 transitions. [2022-07-12 10:16:30,111 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 348.0) internal successors, (1044), 3 states have internal predecessors, (1044), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:30,112 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 401.0) internal successors, (1604), 4 states have internal predecessors, (1604), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:30,112 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 401.0) internal successors, (1604), 4 states have internal predecessors, (1604), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:30,113 INFO L186 Difference]: Start difference. First operand has 352 places, 401 transitions, 946 flow. Second operand 3 states and 1044 transitions. [2022-07-12 10:16:30,113 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 353 places, 345 transitions, 892 flow [2022-07-12 10:16:30,116 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 353 places, 345 transitions, 892 flow, removed 0 selfloop flow, removed 0 redundant places. [2022-07-12 10:16:30,118 INFO L242 Difference]: Finished difference. Result has 354 places, 313 transitions, 753 flow [2022-07-12 10:16:30,119 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=401, PETRI_DIFFERENCE_MINUEND_FLOW=826, PETRI_DIFFERENCE_MINUEND_PLACES=351, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=341, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=339, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=753, PETRI_PLACES=354, PETRI_TRANSITIONS=313} [2022-07-12 10:16:30,119 INFO L279 CegarLoopForPetriNet]: 352 programPoint places, 2 predicate places. [2022-07-12 10:16:30,119 INFO L495 AbstractCegarLoop]: Abstraction has has 354 places, 313 transitions, 753 flow [2022-07-12 10:16:30,119 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 317.0) internal successors, (951), 3 states have internal predecessors, (951), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:30,119 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:30,119 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:30,120 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2022-07-12 10:16:30,120 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:30,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:30,120 INFO L85 PathProgramCache]: Analyzing trace with hash -530905150, now seen corresponding path program 1 times [2022-07-12 10:16:30,120 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:30,120 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [875269180] [2022-07-12 10:16:30,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:30,121 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:30,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:30,140 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:30,141 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:30,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [875269180] [2022-07-12 10:16:30,141 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [875269180] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 10:16:30,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1305366038] [2022-07-12 10:16:30,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:30,141 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:30,142 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 10:16:30,143 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 10:16:30,144 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-07-12 10:16:30,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:30,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 4 conjunts are in the unsatisfiable core [2022-07-12 10:16:30,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 10:16:30,290 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:30,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 10:16:30,310 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:30,310 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1305366038] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 10:16:30,310 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 10:16:30,310 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2022-07-12 10:16:30,311 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610518725] [2022-07-12 10:16:30,311 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 10:16:30,311 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-12 10:16:30,311 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:30,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-12 10:16:30,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-07-12 10:16:30,313 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 315 out of 401 [2022-07-12 10:16:30,315 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 354 places, 313 transitions, 753 flow. Second operand has 10 states, 10 states have (on average 317.3) internal successors, (3173), 10 states have internal predecessors, (3173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:30,315 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:30,315 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 315 of 401 [2022-07-12 10:16:30,315 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:30,568 INFO L129 PetriNetUnfolder]: 0/460 cut-off events. [2022-07-12 10:16:30,568 INFO L130 PetriNetUnfolder]: For 159/159 co-relation queries the response was YES. [2022-07-12 10:16:30,569 INFO L84 FinitePrefix]: Finished finitePrefix Result has 619 conditions, 460 events. 0/460 cut-off events. For 159/159 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 1363 event pairs, 0 based on Foata normal form. 2/462 useless extension candidates. Maximal degree in co-relation 0. Up to 31 conditions per place. [2022-07-12 10:16:30,569 INFO L132 encePairwiseOnDemand]: 395/401 looper letters, 19 selfloop transitions, 9 changer transitions 0/323 dead transitions. [2022-07-12 10:16:30,569 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 342 places, 323 transitions, 831 flow [2022-07-12 10:16:30,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-12 10:16:30,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2022-07-12 10:16:30,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 2865 transitions. [2022-07-12 10:16:30,571 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.7938487115544473 [2022-07-12 10:16:30,571 INFO L72 ComplementDD]: Start complementDD. Operand 9 states and 2865 transitions. [2022-07-12 10:16:30,571 INFO L73 IsDeterministic]: Start isDeterministic. Operand 9 states and 2865 transitions. [2022-07-12 10:16:30,572 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:30,572 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 9 states and 2865 transitions. [2022-07-12 10:16:30,574 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 10 states, 9 states have (on average 318.3333333333333) internal successors, (2865), 9 states have internal predecessors, (2865), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:30,576 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 10 states, 10 states have (on average 401.0) internal successors, (4010), 10 states have internal predecessors, (4010), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:30,576 INFO L81 ComplementDD]: Finished complementDD. Result has 10 states, 10 states have (on average 401.0) internal successors, (4010), 10 states have internal predecessors, (4010), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:30,577 INFO L186 Difference]: Start difference. First operand has 354 places, 313 transitions, 753 flow. Second operand 9 states and 2865 transitions. [2022-07-12 10:16:30,577 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 342 places, 323 transitions, 831 flow [2022-07-12 10:16:30,578 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 341 places, 323 transitions, 757 flow, removed 36 selfloop flow, removed 1 redundant places. [2022-07-12 10:16:30,581 INFO L242 Difference]: Finished difference. Result has 344 places, 319 transitions, 729 flow [2022-07-12 10:16:30,581 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=401, PETRI_DIFFERENCE_MINUEND_FLOW=679, PETRI_DIFFERENCE_MINUEND_PLACES=333, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=313, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=307, PETRI_DIFFERENCE_SUBTRAHEND_STATES=9, PETRI_FLOW=729, PETRI_PLACES=344, PETRI_TRANSITIONS=319} [2022-07-12 10:16:30,581 INFO L279 CegarLoopForPetriNet]: 352 programPoint places, -8 predicate places. [2022-07-12 10:16:30,581 INFO L495 AbstractCegarLoop]: Abstraction has has 344 places, 319 transitions, 729 flow [2022-07-12 10:16:30,582 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 317.3) internal successors, (3173), 10 states have internal predecessors, (3173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:30,582 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:30,582 INFO L200 CegarLoopForPetriNet]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:30,605 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-07-12 10:16:30,795 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:30,795 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:30,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:30,796 INFO L85 PathProgramCache]: Analyzing trace with hash 448323063, now seen corresponding path program 1 times [2022-07-12 10:16:30,796 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:30,796 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [187494705] [2022-07-12 10:16:30,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:30,796 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:30,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:30,836 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:30,836 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:30,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [187494705] [2022-07-12 10:16:30,836 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [187494705] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 10:16:30,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [571724310] [2022-07-12 10:16:30,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:30,837 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:30,837 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 10:16:30,838 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 10:16:30,839 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-07-12 10:16:30,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:30,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 8 conjunts are in the unsatisfiable core [2022-07-12 10:16:30,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 10:16:31,002 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:31,003 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 10:16:31,094 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:31,094 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [571724310] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 10:16:31,094 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 10:16:31,094 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 18 [2022-07-12 10:16:31,094 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306458118] [2022-07-12 10:16:31,094 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 10:16:31,095 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-07-12 10:16:31,095 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:31,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-07-12 10:16:31,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2022-07-12 10:16:31,098 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 315 out of 401 [2022-07-12 10:16:31,100 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 344 places, 319 transitions, 729 flow. Second operand has 18 states, 18 states have (on average 317.6111111111111) internal successors, (5717), 18 states have internal predecessors, (5717), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:31,100 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:31,100 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 315 of 401 [2022-07-12 10:16:31,100 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:31,315 INFO L129 PetriNetUnfolder]: 0/412 cut-off events. [2022-07-12 10:16:31,316 INFO L130 PetriNetUnfolder]: For 48/48 co-relation queries the response was YES. [2022-07-12 10:16:31,316 INFO L84 FinitePrefix]: Finished finitePrefix Result has 588 conditions, 412 events. 0/412 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 1040 event pairs, 0 based on Foata normal form. 4/416 useless extension candidates. Maximal degree in co-relation 0. Up to 15 conditions per place. [2022-07-12 10:16:31,317 INFO L132 encePairwiseOnDemand]: 395/401 looper letters, 27 selfloop transitions, 21 changer transitions 0/343 dead transitions. [2022-07-12 10:16:31,317 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 364 places, 343 transitions, 933 flow [2022-07-12 10:16:31,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-07-12 10:16:31,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2022-07-12 10:16:31,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 6667 transitions. [2022-07-12 10:16:31,322 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.7917111981949887 [2022-07-12 10:16:31,322 INFO L72 ComplementDD]: Start complementDD. Operand 21 states and 6667 transitions. [2022-07-12 10:16:31,322 INFO L73 IsDeterministic]: Start isDeterministic. Operand 21 states and 6667 transitions. [2022-07-12 10:16:31,323 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:31,323 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 21 states and 6667 transitions. [2022-07-12 10:16:31,332 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 22 states, 21 states have (on average 317.4761904761905) internal successors, (6667), 21 states have internal predecessors, (6667), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:31,337 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 22 states, 22 states have (on average 401.0) internal successors, (8822), 22 states have internal predecessors, (8822), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:31,337 INFO L81 ComplementDD]: Finished complementDD. Result has 22 states, 22 states have (on average 401.0) internal successors, (8822), 22 states have internal predecessors, (8822), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:31,337 INFO L186 Difference]: Start difference. First operand has 344 places, 319 transitions, 729 flow. Second operand 21 states and 6667 transitions. [2022-07-12 10:16:31,338 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 364 places, 343 transitions, 933 flow [2022-07-12 10:16:31,340 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 363 places, 343 transitions, 919 flow, removed 6 selfloop flow, removed 1 redundant places. [2022-07-12 10:16:31,342 INFO L242 Difference]: Finished difference. Result has 368 places, 332 transitions, 853 flow [2022-07-12 10:16:31,343 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=401, PETRI_DIFFERENCE_MINUEND_FLOW=723, PETRI_DIFFERENCE_MINUEND_PLACES=343, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=319, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=10, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=308, PETRI_DIFFERENCE_SUBTRAHEND_STATES=21, PETRI_FLOW=853, PETRI_PLACES=368, PETRI_TRANSITIONS=332} [2022-07-12 10:16:31,343 INFO L279 CegarLoopForPetriNet]: 352 programPoint places, 16 predicate places. [2022-07-12 10:16:31,343 INFO L495 AbstractCegarLoop]: Abstraction has has 368 places, 332 transitions, 853 flow [2022-07-12 10:16:31,344 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 317.6111111111111) internal successors, (5717), 18 states have internal predecessors, (5717), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:31,344 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:31,344 INFO L200 CegarLoopForPetriNet]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:31,363 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-07-12 10:16:31,556 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-07-12 10:16:31,556 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:31,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:31,557 INFO L85 PathProgramCache]: Analyzing trace with hash -474388523, now seen corresponding path program 1 times [2022-07-12 10:16:31,557 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:31,557 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [70886500] [2022-07-12 10:16:31,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:31,557 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:31,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:31,671 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 0 proven. 217 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:31,671 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:31,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [70886500] [2022-07-12 10:16:31,671 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [70886500] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 10:16:31,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [392998915] [2022-07-12 10:16:31,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:31,672 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:31,672 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 10:16:31,673 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 10:16:31,674 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-07-12 10:16:31,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:31,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 16 conjunts are in the unsatisfiable core [2022-07-12 10:16:31,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 10:16:31,895 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 0 proven. 217 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:31,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 10:16:32,113 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 0 proven. 217 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:32,113 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [392998915] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 10:16:32,113 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 10:16:32,113 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 34 [2022-07-12 10:16:32,113 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745930287] [2022-07-12 10:16:32,113 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 10:16:32,114 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-07-12 10:16:32,114 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:32,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-07-12 10:16:32,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=816, Unknown=0, NotChecked=0, Total=1122 [2022-07-12 10:16:32,118 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 315 out of 401 [2022-07-12 10:16:32,123 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 368 places, 332 transitions, 853 flow. Second operand has 34 states, 34 states have (on average 317.79411764705884) internal successors, (10805), 34 states have internal predecessors, (10805), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:32,123 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:32,123 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 315 of 401 [2022-07-12 10:16:32,123 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:32,391 INFO L129 PetriNetUnfolder]: 0/376 cut-off events. [2022-07-12 10:16:32,391 INFO L130 PetriNetUnfolder]: For 114/114 co-relation queries the response was YES. [2022-07-12 10:16:32,391 INFO L84 FinitePrefix]: Finished finitePrefix Result has 581 conditions, 376 events. 0/376 cut-off events. For 114/114 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 821 event pairs, 0 based on Foata normal form. 3/379 useless extension candidates. Maximal degree in co-relation 0. Up to 15 conditions per place. [2022-07-12 10:16:32,392 INFO L132 encePairwiseOnDemand]: 396/401 looper letters, 30 selfloop transitions, 28 changer transitions 0/342 dead transitions. [2022-07-12 10:16:32,392 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 385 places, 342 transitions, 1045 flow [2022-07-12 10:16:32,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-07-12 10:16:32,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2022-07-12 10:16:32,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 9511 transitions. [2022-07-12 10:16:32,397 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.7906068162926019 [2022-07-12 10:16:32,397 INFO L72 ComplementDD]: Start complementDD. Operand 30 states and 9511 transitions. [2022-07-12 10:16:32,397 INFO L73 IsDeterministic]: Start isDeterministic. Operand 30 states and 9511 transitions. [2022-07-12 10:16:32,398 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:32,398 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 30 states and 9511 transitions. [2022-07-12 10:16:32,405 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 31 states, 30 states have (on average 317.03333333333336) internal successors, (9511), 30 states have internal predecessors, (9511), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:32,412 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 31 states, 31 states have (on average 401.0) internal successors, (12431), 31 states have internal predecessors, (12431), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:32,412 INFO L81 ComplementDD]: Finished complementDD. Result has 31 states, 31 states have (on average 401.0) internal successors, (12431), 31 states have internal predecessors, (12431), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:32,413 INFO L186 Difference]: Start difference. First operand has 368 places, 332 transitions, 853 flow. Second operand 30 states and 9511 transitions. [2022-07-12 10:16:32,413 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 385 places, 342 transitions, 1045 flow [2022-07-12 10:16:32,416 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 372 places, 342 transitions, 985 flow, removed 8 selfloop flow, removed 13 redundant places. [2022-07-12 10:16:32,421 INFO L242 Difference]: Finished difference. Result has 372 places, 326 transitions, 862 flow [2022-07-12 10:16:32,422 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=401, PETRI_DIFFERENCE_MINUEND_FLOW=770, PETRI_DIFFERENCE_MINUEND_PLACES=343, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=320, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=22, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=298, PETRI_DIFFERENCE_SUBTRAHEND_STATES=30, PETRI_FLOW=862, PETRI_PLACES=372, PETRI_TRANSITIONS=326} [2022-07-12 10:16:32,422 INFO L279 CegarLoopForPetriNet]: 352 programPoint places, 20 predicate places. [2022-07-12 10:16:32,422 INFO L495 AbstractCegarLoop]: Abstraction has has 372 places, 326 transitions, 862 flow [2022-07-12 10:16:32,423 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 317.79411764705884) internal successors, (10805), 34 states have internal predecessors, (10805), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:32,423 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:32,424 INFO L200 CegarLoopForPetriNet]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:32,443 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-07-12 10:16:32,639 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-07-12 10:16:32,639 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:32,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:32,640 INFO L85 PathProgramCache]: Analyzing trace with hash -1527543321, now seen corresponding path program 1 times [2022-07-12 10:16:32,640 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:32,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [683537771] [2022-07-12 10:16:32,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:32,640 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:32,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-12 10:16:32,654 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-07-12 10:16:32,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-12 10:16:32,673 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-07-12 10:16:32,673 INFO L271 BasicCegarLoop]: Counterexample is feasible [2022-07-12 10:16:32,674 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (1 of 2 remaining) [2022-07-12 10:16:32,674 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 2 remaining) [2022-07-12 10:16:32,674 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2022-07-12 10:16:32,674 INFO L356 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1] [2022-07-12 10:16:32,674 WARN L231 ceAbstractionStarter]: 9 thread instances were not sufficient, I will increase this number and restart the analysis [2022-07-12 10:16:32,674 INFO L509 ceAbstractionStarter]: Constructing petrified ICFG for 10 thread instances. [2022-07-12 10:16:32,703 INFO L135 ThreadInstanceAdder]: Constructed 10 joinOtherThreadTransitions. [2022-07-12 10:16:32,706 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 382 places, 436 transitions, 1042 flow [2022-07-12 10:16:37,077 INFO L129 PetriNetUnfolder]: 5235/20189 cut-off events. [2022-07-12 10:16:37,077 INFO L130 PetriNetUnfolder]: For 5330/5330 co-relation queries the response was YES. [2022-07-12 10:16:37,486 INFO L84 FinitePrefix]: Finished finitePrefix Result has 25395 conditions, 20189 events. 5235/20189 cut-off events. For 5330/5330 co-relation queries the response was YES. Maximal size of possible extension queue 378. Compared 212704 event pairs, 3084 based on Foata normal form. 0/18015 useless extension candidates. Maximal degree in co-relation 12495. Up to 5120 conditions per place. [2022-07-12 10:16:37,486 INFO L82 GeneralOperation]: Start removeDead. Operand has 382 places, 436 transitions, 1042 flow [2022-07-12 10:16:37,778 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 382 places, 436 transitions, 1042 flow [2022-07-12 10:16:37,779 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-12 10:16:37,779 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@2db21756, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@16dd23c4 [2022-07-12 10:16:37,780 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-07-12 10:16:37,783 INFO L129 PetriNetUnfolder]: 4/88 cut-off events. [2022-07-12 10:16:37,783 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2022-07-12 10:16:37,783 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:37,784 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:37,784 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:37,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:37,784 INFO L85 PathProgramCache]: Analyzing trace with hash 1258077814, now seen corresponding path program 1 times [2022-07-12 10:16:37,784 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:37,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103598437] [2022-07-12 10:16:37,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:37,785 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:37,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:37,797 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:37,797 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:37,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103598437] [2022-07-12 10:16:37,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2103598437] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 10:16:37,797 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 10:16:37,798 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-12 10:16:37,798 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010877394] [2022-07-12 10:16:37,798 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 10:16:37,798 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-12 10:16:37,798 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:37,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-12 10:16:37,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-12 10:16:37,800 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 343 out of 436 [2022-07-12 10:16:37,800 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 382 places, 436 transitions, 1042 flow. Second operand has 3 states, 3 states have (on average 344.0) internal successors, (1032), 3 states have internal predecessors, (1032), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:37,800 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:37,800 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 343 of 436 [2022-07-12 10:16:37,801 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:42,716 INFO L129 PetriNetUnfolder]: 4106/19031 cut-off events. [2022-07-12 10:16:42,716 INFO L130 PetriNetUnfolder]: For 15620/15874 co-relation queries the response was YES. [2022-07-12 10:16:42,913 INFO L84 FinitePrefix]: Finished finitePrefix Result has 29422 conditions, 19031 events. 4106/19031 cut-off events. For 15620/15874 co-relation queries the response was YES. Maximal size of possible extension queue 357. Compared 206965 event pairs, 3084 based on Foata normal form. 33284/51271 useless extension candidates. Maximal degree in co-relation 14229. Up to 5180 conditions per place. [2022-07-12 10:16:42,920 INFO L132 encePairwiseOnDemand]: 368/436 looper letters, 19 selfloop transitions, 2 changer transitions 30/374 dead transitions. [2022-07-12 10:16:42,920 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 383 places, 374 transitions, 980 flow [2022-07-12 10:16:42,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-12 10:16:42,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2022-07-12 10:16:42,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 1133 transitions. [2022-07-12 10:16:42,921 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.8662079510703364 [2022-07-12 10:16:42,921 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 1133 transitions. [2022-07-12 10:16:42,921 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 1133 transitions. [2022-07-12 10:16:42,921 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:42,921 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 1133 transitions. [2022-07-12 10:16:42,922 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 377.6666666666667) internal successors, (1133), 3 states have internal predecessors, (1133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:42,923 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 436.0) internal successors, (1744), 4 states have internal predecessors, (1744), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:42,923 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 436.0) internal successors, (1744), 4 states have internal predecessors, (1744), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:42,923 INFO L186 Difference]: Start difference. First operand has 382 places, 436 transitions, 1042 flow. Second operand 3 states and 1133 transitions. [2022-07-12 10:16:42,923 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 383 places, 374 transitions, 980 flow [2022-07-12 10:16:42,929 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 383 places, 374 transitions, 980 flow, removed 0 selfloop flow, removed 0 redundant places. [2022-07-12 10:16:42,932 INFO L242 Difference]: Finished difference. Result has 384 places, 341 transitions, 832 flow [2022-07-12 10:16:42,933 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=436, PETRI_DIFFERENCE_MINUEND_FLOW=910, PETRI_DIFFERENCE_MINUEND_PLACES=381, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=370, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=368, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=832, PETRI_PLACES=384, PETRI_TRANSITIONS=341} [2022-07-12 10:16:42,933 INFO L279 CegarLoopForPetriNet]: 382 programPoint places, 2 predicate places. [2022-07-12 10:16:42,933 INFO L495 AbstractCegarLoop]: Abstraction has has 384 places, 341 transitions, 832 flow [2022-07-12 10:16:42,933 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 344.0) internal successors, (1032), 3 states have internal predecessors, (1032), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:42,933 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:42,933 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:42,934 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2022-07-12 10:16:42,934 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:42,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:42,934 INFO L85 PathProgramCache]: Analyzing trace with hash -1713983295, now seen corresponding path program 1 times [2022-07-12 10:16:42,934 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:42,934 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1144339756] [2022-07-12 10:16:42,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:42,934 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:42,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:42,952 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:42,953 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:42,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1144339756] [2022-07-12 10:16:42,953 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1144339756] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 10:16:42,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [547976331] [2022-07-12 10:16:42,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:42,953 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:42,953 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 10:16:42,954 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 10:16:42,955 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-07-12 10:16:43,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:43,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 4 conjunts are in the unsatisfiable core [2022-07-12 10:16:43,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 10:16:43,116 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:43,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 10:16:43,136 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:43,136 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [547976331] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 10:16:43,136 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 10:16:43,136 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2022-07-12 10:16:43,136 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988391540] [2022-07-12 10:16:43,136 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 10:16:43,136 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-12 10:16:43,136 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:43,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-12 10:16:43,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-07-12 10:16:43,138 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 342 out of 436 [2022-07-12 10:16:43,139 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 384 places, 341 transitions, 832 flow. Second operand has 10 states, 10 states have (on average 344.3) internal successors, (3443), 10 states have internal predecessors, (3443), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:43,139 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:43,139 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 342 of 436 [2022-07-12 10:16:43,139 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:43,293 INFO L129 PetriNetUnfolder]: 0/509 cut-off events. [2022-07-12 10:16:43,293 INFO L130 PetriNetUnfolder]: For 213/213 co-relation queries the response was YES. [2022-07-12 10:16:43,293 INFO L84 FinitePrefix]: Finished finitePrefix Result has 690 conditions, 509 events. 0/509 cut-off events. For 213/213 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 1552 event pairs, 0 based on Foata normal form. 2/511 useless extension candidates. Maximal degree in co-relation 0. Up to 35 conditions per place. [2022-07-12 10:16:43,294 INFO L132 encePairwiseOnDemand]: 430/436 looper letters, 20 selfloop transitions, 9 changer transitions 0/351 dead transitions. [2022-07-12 10:16:43,294 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 372 places, 351 transitions, 912 flow [2022-07-12 10:16:43,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-12 10:16:43,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2022-07-12 10:16:43,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 3109 transitions. [2022-07-12 10:16:43,297 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.7923037716615698 [2022-07-12 10:16:43,297 INFO L72 ComplementDD]: Start complementDD. Operand 9 states and 3109 transitions. [2022-07-12 10:16:43,297 INFO L73 IsDeterministic]: Start isDeterministic. Operand 9 states and 3109 transitions. [2022-07-12 10:16:43,297 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:43,297 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 9 states and 3109 transitions. [2022-07-12 10:16:43,300 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 10 states, 9 states have (on average 345.44444444444446) internal successors, (3109), 9 states have internal predecessors, (3109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:43,307 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 10 states, 10 states have (on average 436.0) internal successors, (4360), 10 states have internal predecessors, (4360), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:43,307 INFO L81 ComplementDD]: Finished complementDD. Result has 10 states, 10 states have (on average 436.0) internal successors, (4360), 10 states have internal predecessors, (4360), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:43,307 INFO L186 Difference]: Start difference. First operand has 384 places, 341 transitions, 832 flow. Second operand 9 states and 3109 transitions. [2022-07-12 10:16:43,307 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 372 places, 351 transitions, 912 flow [2022-07-12 10:16:43,312 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 371 places, 351 transitions, 820 flow, removed 45 selfloop flow, removed 1 redundant places. [2022-07-12 10:16:43,317 INFO L242 Difference]: Finished difference. Result has 374 places, 347 transitions, 790 flow [2022-07-12 10:16:43,317 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=436, PETRI_DIFFERENCE_MINUEND_FLOW=740, PETRI_DIFFERENCE_MINUEND_PLACES=363, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=341, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=335, PETRI_DIFFERENCE_SUBTRAHEND_STATES=9, PETRI_FLOW=790, PETRI_PLACES=374, PETRI_TRANSITIONS=347} [2022-07-12 10:16:43,317 INFO L279 CegarLoopForPetriNet]: 382 programPoint places, -8 predicate places. [2022-07-12 10:16:43,317 INFO L495 AbstractCegarLoop]: Abstraction has has 374 places, 347 transitions, 790 flow [2022-07-12 10:16:43,318 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 344.3) internal successors, (3443), 10 states have internal predecessors, (3443), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:43,318 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:43,318 INFO L200 CegarLoopForPetriNet]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:43,338 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-07-12 10:16:43,539 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:43,539 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:43,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:43,540 INFO L85 PathProgramCache]: Analyzing trace with hash -392418380, now seen corresponding path program 1 times [2022-07-12 10:16:43,540 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:43,540 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [54807331] [2022-07-12 10:16:43,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:43,540 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:43,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:43,591 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:43,591 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:43,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [54807331] [2022-07-12 10:16:43,591 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [54807331] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 10:16:43,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [598521022] [2022-07-12 10:16:43,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:43,592 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:43,592 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 10:16:43,600 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 10:16:43,601 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-07-12 10:16:43,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:43,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 8 conjunts are in the unsatisfiable core [2022-07-12 10:16:43,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 10:16:43,785 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:43,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 10:16:43,861 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:43,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [598521022] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 10:16:43,861 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 10:16:43,861 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 18 [2022-07-12 10:16:43,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105122567] [2022-07-12 10:16:43,862 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 10:16:43,862 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-07-12 10:16:43,862 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:43,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-07-12 10:16:43,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2022-07-12 10:16:43,864 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 342 out of 436 [2022-07-12 10:16:43,866 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 374 places, 347 transitions, 790 flow. Second operand has 18 states, 18 states have (on average 344.6111111111111) internal successors, (6203), 18 states have internal predecessors, (6203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:43,866 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:43,866 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 342 of 436 [2022-07-12 10:16:43,867 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:44,158 INFO L129 PetriNetUnfolder]: 0/461 cut-off events. [2022-07-12 10:16:44,158 INFO L130 PetriNetUnfolder]: For 54/54 co-relation queries the response was YES. [2022-07-12 10:16:44,159 INFO L84 FinitePrefix]: Finished finitePrefix Result has 658 conditions, 461 events. 0/461 cut-off events. For 54/54 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 1225 event pairs, 0 based on Foata normal form. 4/465 useless extension candidates. Maximal degree in co-relation 0. Up to 19 conditions per place. [2022-07-12 10:16:44,159 INFO L132 encePairwiseOnDemand]: 430/436 looper letters, 28 selfloop transitions, 21 changer transitions 0/371 dead transitions. [2022-07-12 10:16:44,159 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 394 places, 371 transitions, 996 flow [2022-07-12 10:16:44,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-07-12 10:16:44,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2022-07-12 10:16:44,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 7235 transitions. [2022-07-12 10:16:44,163 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.7901922236784622 [2022-07-12 10:16:44,163 INFO L72 ComplementDD]: Start complementDD. Operand 21 states and 7235 transitions. [2022-07-12 10:16:44,163 INFO L73 IsDeterministic]: Start isDeterministic. Operand 21 states and 7235 transitions. [2022-07-12 10:16:44,164 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:44,164 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 21 states and 7235 transitions. [2022-07-12 10:16:44,168 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 22 states, 21 states have (on average 344.5238095238095) internal successors, (7235), 21 states have internal predecessors, (7235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:44,172 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 22 states, 22 states have (on average 436.0) internal successors, (9592), 22 states have internal predecessors, (9592), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:44,172 INFO L81 ComplementDD]: Finished complementDD. Result has 22 states, 22 states have (on average 436.0) internal successors, (9592), 22 states have internal predecessors, (9592), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:44,172 INFO L186 Difference]: Start difference. First operand has 374 places, 347 transitions, 790 flow. Second operand 21 states and 7235 transitions. [2022-07-12 10:16:44,172 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 394 places, 371 transitions, 996 flow [2022-07-12 10:16:44,174 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 393 places, 371 transitions, 982 flow, removed 6 selfloop flow, removed 1 redundant places. [2022-07-12 10:16:44,177 INFO L242 Difference]: Finished difference. Result has 398 places, 360 transitions, 914 flow [2022-07-12 10:16:44,178 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=436, PETRI_DIFFERENCE_MINUEND_FLOW=784, PETRI_DIFFERENCE_MINUEND_PLACES=373, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=347, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=10, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=336, PETRI_DIFFERENCE_SUBTRAHEND_STATES=21, PETRI_FLOW=914, PETRI_PLACES=398, PETRI_TRANSITIONS=360} [2022-07-12 10:16:44,178 INFO L279 CegarLoopForPetriNet]: 382 programPoint places, 16 predicate places. [2022-07-12 10:16:44,178 INFO L495 AbstractCegarLoop]: Abstraction has has 398 places, 360 transitions, 914 flow [2022-07-12 10:16:44,179 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 344.6111111111111) internal successors, (6203), 18 states have internal predecessors, (6203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:44,179 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:44,179 INFO L200 CegarLoopForPetriNet]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:44,209 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-07-12 10:16:44,391 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:44,392 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:44,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:44,392 INFO L85 PathProgramCache]: Analyzing trace with hash 1059331598, now seen corresponding path program 1 times [2022-07-12 10:16:44,392 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:44,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1354519652] [2022-07-12 10:16:44,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:44,392 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:44,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:44,491 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 0 proven. 217 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:44,491 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:44,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1354519652] [2022-07-12 10:16:44,491 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1354519652] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 10:16:44,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1440444176] [2022-07-12 10:16:44,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:44,492 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:44,492 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 10:16:44,493 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 10:16:44,494 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-07-12 10:16:44,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:44,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 16 conjunts are in the unsatisfiable core [2022-07-12 10:16:44,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 10:16:44,730 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 0 proven. 217 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:44,730 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 10:16:44,936 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 0 proven. 217 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:44,936 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1440444176] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 10:16:44,936 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 10:16:44,936 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 34 [2022-07-12 10:16:44,937 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375180902] [2022-07-12 10:16:44,937 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 10:16:44,937 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-07-12 10:16:44,937 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:44,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-07-12 10:16:44,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=816, Unknown=0, NotChecked=0, Total=1122 [2022-07-12 10:16:44,942 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 342 out of 436 [2022-07-12 10:16:44,945 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 398 places, 360 transitions, 914 flow. Second operand has 34 states, 34 states have (on average 344.79411764705884) internal successors, (11723), 34 states have internal predecessors, (11723), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:44,945 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:44,945 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 342 of 436 [2022-07-12 10:16:44,945 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-12 10:16:45,288 INFO L129 PetriNetUnfolder]: 0/413 cut-off events. [2022-07-12 10:16:45,289 INFO L130 PetriNetUnfolder]: For 141/141 co-relation queries the response was YES. [2022-07-12 10:16:45,289 INFO L84 FinitePrefix]: Finished finitePrefix Result has 640 conditions, 413 events. 0/413 cut-off events. For 141/141 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 925 event pairs, 0 based on Foata normal form. 4/417 useless extension candidates. Maximal degree in co-relation 0. Up to 17 conditions per place. [2022-07-12 10:16:45,289 INFO L132 encePairwiseOnDemand]: 431/436 looper letters, 33 selfloop transitions, 31 changer transitions 0/375 dead transitions. [2022-07-12 10:16:45,290 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 418 places, 375 transitions, 1152 flow [2022-07-12 10:16:45,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-07-12 10:16:45,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2022-07-12 10:16:45,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 11354 transitions. [2022-07-12 10:16:45,309 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.7891298304142341 [2022-07-12 10:16:45,309 INFO L72 ComplementDD]: Start complementDD. Operand 33 states and 11354 transitions. [2022-07-12 10:16:45,309 INFO L73 IsDeterministic]: Start isDeterministic. Operand 33 states and 11354 transitions. [2022-07-12 10:16:45,310 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-12 10:16:45,310 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 33 states and 11354 transitions. [2022-07-12 10:16:45,316 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 34 states, 33 states have (on average 344.06060606060606) internal successors, (11354), 33 states have internal predecessors, (11354), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:45,322 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 34 states, 34 states have (on average 436.0) internal successors, (14824), 34 states have internal predecessors, (14824), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:45,323 INFO L81 ComplementDD]: Finished complementDD. Result has 34 states, 34 states have (on average 436.0) internal successors, (14824), 34 states have internal predecessors, (14824), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:45,323 INFO L186 Difference]: Start difference. First operand has 398 places, 360 transitions, 914 flow. Second operand 33 states and 11354 transitions. [2022-07-12 10:16:45,324 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 418 places, 375 transitions, 1152 flow [2022-07-12 10:16:45,326 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 405 places, 375 transitions, 1086 flow, removed 9 selfloop flow, removed 13 redundant places. [2022-07-12 10:16:45,329 INFO L242 Difference]: Finished difference. Result has 405 places, 357 transitions, 947 flow [2022-07-12 10:16:45,330 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=436, PETRI_DIFFERENCE_MINUEND_FLOW=831, PETRI_DIFFERENCE_MINUEND_PLACES=373, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=348, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=22, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=326, PETRI_DIFFERENCE_SUBTRAHEND_STATES=33, PETRI_FLOW=947, PETRI_PLACES=405, PETRI_TRANSITIONS=357} [2022-07-12 10:16:45,330 INFO L279 CegarLoopForPetriNet]: 382 programPoint places, 23 predicate places. [2022-07-12 10:16:45,330 INFO L495 AbstractCegarLoop]: Abstraction has has 405 places, 357 transitions, 947 flow [2022-07-12 10:16:45,331 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 344.79411764705884) internal successors, (11723), 34 states have internal predecessors, (11723), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:45,331 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:45,331 INFO L200 CegarLoopForPetriNet]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:45,350 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-07-12 10:16:45,545 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 10:16:45,546 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:45,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:45,546 INFO L85 PathProgramCache]: Analyzing trace with hash 643531587, now seen corresponding path program 1 times [2022-07-12 10:16:45,546 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:45,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [283632602] [2022-07-12 10:16:45,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:45,546 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:45,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-12 10:16:45,582 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-07-12 10:16:45,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-12 10:16:45,606 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-07-12 10:16:45,606 INFO L271 BasicCegarLoop]: Counterexample is feasible [2022-07-12 10:16:45,606 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (1 of 2 remaining) [2022-07-12 10:16:45,606 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 2 remaining) [2022-07-12 10:16:45,606 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2022-07-12 10:16:45,606 INFO L356 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1] [2022-07-12 10:16:45,607 WARN L231 ceAbstractionStarter]: 10 thread instances were not sufficient, I will increase this number and restart the analysis [2022-07-12 10:16:45,607 INFO L509 ceAbstractionStarter]: Constructing petrified ICFG for 11 thread instances. [2022-07-12 10:16:45,635 INFO L135 ThreadInstanceAdder]: Constructed 11 joinOtherThreadTransitions. [2022-07-12 10:16:45,638 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 412 places, 471 transitions, 1140 flow [2022-07-12 10:16:55,477 INFO L129 PetriNetUnfolder]: 11390/40736 cut-off events. [2022-07-12 10:16:55,477 INFO L130 PetriNetUnfolder]: For 11539/11539 co-relation queries the response was YES. [2022-07-12 10:16:56,473 INFO L84 FinitePrefix]: Finished finitePrefix Result has 52100 conditions, 40736 events. 11390/40736 cut-off events. For 11539/11539 co-relation queries the response was YES. Maximal size of possible extension queue 750. Compared 481455 event pairs, 7181 based on Foata normal form. 0/36502 useless extension candidates. Maximal degree in co-relation 25373. Up to 11264 conditions per place. [2022-07-12 10:16:56,473 INFO L82 GeneralOperation]: Start removeDead. Operand has 412 places, 471 transitions, 1140 flow [2022-07-12 10:16:57,165 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 412 places, 471 transitions, 1140 flow [2022-07-12 10:16:57,166 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-12 10:16:57,166 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@2db21756, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@16dd23c4 [2022-07-12 10:16:57,166 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-07-12 10:16:57,169 INFO L129 PetriNetUnfolder]: 5/91 cut-off events. [2022-07-12 10:16:57,169 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2022-07-12 10:16:57,169 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-12 10:16:57,169 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 10:16:57,169 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-07-12 10:16:57,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 10:16:57,170 INFO L85 PathProgramCache]: Analyzing trace with hash 151314006, now seen corresponding path program 1 times [2022-07-12 10:16:57,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 10:16:57,170 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1547292723] [2022-07-12 10:16:57,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 10:16:57,170 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 10:16:57,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 10:16:57,189 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 10:16:57,189 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 10:16:57,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1547292723] [2022-07-12 10:16:57,190 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1547292723] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-12 10:16:57,190 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-12 10:16:57,190 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-12 10:16:57,190 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452348662] [2022-07-12 10:16:57,190 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-12 10:16:57,190 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-12 10:16:57,190 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 10:16:57,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-12 10:16:57,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-12 10:16:57,194 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 370 out of 471 [2022-07-12 10:16:57,195 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 412 places, 471 transitions, 1140 flow. Second operand has 3 states, 3 states have (on average 371.0) internal successors, (1113), 3 states have internal predecessors, (1113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-12 10:16:57,195 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-12 10:16:57,195 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 370 of 471 [2022-07-12 10:16:57,195 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand