./Ultimate.py --spec ../../../trunk/examples/svcomp/properties/unreach-call.prp --file ../../../trunk/examples/svcomp/goblint-regression/28-race_reach_36-indirect_racefree.i --full-output --traceabstraction.when.to.check.the.insufficient.erros.location.relative.to.the.other.error.locations AFTER --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version b8dbc81d 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 ../../../trunk/examples/svcomp/goblint-regression/28-race_reach_36-indirect_racefree.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 3eff698bae51c39e8a3a4c763800dbda831dabb73a169fa31c8e326faee47cd8 --traceabstraction.when.to.check.the.insufficient.erros.location.relative.to.the.other.error.locations AFTER --- Real Ultimate output --- This is Ultimate 0.2.3-?-b8dbc81 [2023-08-30 17:53:11,791 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-08-30 17:53:11,794 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-08-30 17:53:11,838 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-08-30 17:53:11,840 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-08-30 17:53:11,843 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-08-30 17:53:11,845 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-08-30 17:53:11,848 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-08-30 17:53:11,850 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-08-30 17:53:11,855 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-08-30 17:53:11,856 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-08-30 17:53:11,858 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-08-30 17:53:11,859 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-08-30 17:53:11,860 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-08-30 17:53:11,861 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-08-30 17:53:11,866 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-08-30 17:53:11,868 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-08-30 17:53:11,869 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-08-30 17:53:11,870 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-08-30 17:53:11,877 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-08-30 17:53:11,878 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-08-30 17:53:11,879 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-08-30 17:53:11,880 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-08-30 17:53:11,881 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-08-30 17:53:11,887 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-08-30 17:53:11,887 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-08-30 17:53:11,888 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-08-30 17:53:11,890 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-08-30 17:53:11,890 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-08-30 17:53:11,891 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-08-30 17:53:11,891 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-08-30 17:53:11,897 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-08-30 17:53:11,899 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-08-30 17:53:11,899 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-08-30 17:53:11,900 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-08-30 17:53:11,900 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-08-30 17:53:11,901 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-08-30 17:53:11,901 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-08-30 17:53:11,901 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-08-30 17:53:11,902 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-08-30 17:53:11,902 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-08-30 17:53:11,904 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2023-08-30 17:53:11,936 INFO L113 SettingsManager]: Loading preferences was successful [2023-08-30 17:53:11,937 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-30 17:53:11,938 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-08-30 17:53:11,938 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-08-30 17:53:11,939 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-30 17:53:11,939 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-30 17:53:11,939 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-30 17:53:11,940 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2023-08-30 17:53:11,940 INFO L138 SettingsManager]: * Use SBE=true [2023-08-30 17:53:11,940 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-30 17:53:11,941 INFO L138 SettingsManager]: * sizeof long=4 [2023-08-30 17:53:11,941 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-30 17:53:11,941 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-08-30 17:53:11,941 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-08-30 17:53:11,942 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-30 17:53:11,942 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-30 17:53:11,942 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-30 17:53:11,942 INFO L138 SettingsManager]: * sizeof long double=12 [2023-08-30 17:53:11,942 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-08-30 17:53:11,942 INFO L138 SettingsManager]: * Use constant arrays=true [2023-08-30 17:53:11,943 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-30 17:53:11,943 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-30 17:53:11,943 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-30 17:53:11,943 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-30 17:53:11,943 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-30 17:53:11,944 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-30 17:53:11,944 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-30 17:53:11,944 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-30 17:53:11,944 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-30 17:53:11,944 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-30 17:53:11,944 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-30 17:53:11,945 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-08-30 17:53:11,945 INFO L138 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-08-30 17:53:11,945 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-30 17:53:11,945 INFO L138 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-08-30 17:53:11,945 INFO L138 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 3eff698bae51c39e8a3a4c763800dbda831dabb73a169fa31c8e326faee47cd8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: When to check the insufficient erros location relative to the other error locations -> AFTER [2023-08-30 17:53:12,236 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-30 17:53:12,254 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-30 17:53:12,256 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-30 17:53:12,257 INFO L271 PluginConnector]: Initializing CDTParser... [2023-08-30 17:53:12,257 INFO L275 PluginConnector]: CDTParser initialized [2023-08-30 17:53:12,259 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_36-indirect_racefree.i [2023-08-30 17:53:13,538 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-08-30 17:53:13,826 INFO L351 CDTParser]: Found 1 translation units. [2023-08-30 17:53:13,827 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_36-indirect_racefree.i [2023-08-30 17:53:13,836 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/32de3d268/361973f37abf4ffd9f2500ac344e5b2a/FLAGe60103407 [2023-08-30 17:53:13,850 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/32de3d268/361973f37abf4ffd9f2500ac344e5b2a [2023-08-30 17:53:13,852 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-30 17:53:13,853 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2023-08-30 17:53:13,854 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-30 17:53:13,854 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-30 17:53:13,857 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-30 17:53:13,857 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.08 05:53:13" (1/1) ... [2023-08-30 17:53:13,858 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@54028bed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:53:13, skipping insertion in model container [2023-08-30 17:53:13,858 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.08 05:53:13" (1/1) ... [2023-08-30 17:53:13,863 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-08-30 17:53:13,894 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-08-30 17:53:14,154 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_36-indirect_racefree.i[30176,30189] [2023-08-30 17:53:14,176 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-30 17:53:14,190 INFO L203 MainTranslator]: Completed pre-run [2023-08-30 17:53:14,274 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_36-indirect_racefree.i[30176,30189] [2023-08-30 17:53:14,295 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-30 17:53:14,340 INFO L208 MainTranslator]: Completed translation [2023-08-30 17:53:14,340 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:53:14 WrapperNode [2023-08-30 17:53:14,341 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-30 17:53:14,342 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-30 17:53:14,342 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-30 17:53:14,342 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-30 17:53:14,348 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:53:14" (1/1) ... [2023-08-30 17:53:14,374 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:53:14" (1/1) ... [2023-08-30 17:53:14,400 INFO L138 Inliner]: procedures = 170, calls = 37, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 80 [2023-08-30 17:53:14,401 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-30 17:53:14,402 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-30 17:53:14,402 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-30 17:53:14,402 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-08-30 17:53:14,410 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:53:14" (1/1) ... [2023-08-30 17:53:14,411 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:53:14" (1/1) ... [2023-08-30 17:53:14,418 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:53:14" (1/1) ... [2023-08-30 17:53:14,418 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:53:14" (1/1) ... [2023-08-30 17:53:14,432 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:53:14" (1/1) ... [2023-08-30 17:53:14,436 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:53:14" (1/1) ... [2023-08-30 17:53:14,437 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:53:14" (1/1) ... [2023-08-30 17:53:14,438 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:53:14" (1/1) ... [2023-08-30 17:53:14,440 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-30 17:53:14,442 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-30 17:53:14,442 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-08-30 17:53:14,442 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-08-30 17:53:14,443 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:53:14" (1/1) ... [2023-08-30 17:53:14,448 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-30 17:53:14,459 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-30 17:53:14,474 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) [2023-08-30 17:53:14,490 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 [2023-08-30 17:53:14,515 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-30 17:53:14,515 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-30 17:53:14,515 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-08-30 17:53:14,515 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-30 17:53:14,516 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-30 17:53:14,516 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-08-30 17:53:14,516 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-08-30 17:53:14,516 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-30 17:53:14,516 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-30 17:53:14,517 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-30 17:53:14,517 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-30 17:53:14,518 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-08-30 17:53:14,647 INFO L236 CfgBuilder]: Building ICFG [2023-08-30 17:53:14,649 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-30 17:53:14,886 INFO L277 CfgBuilder]: Performing block encoding [2023-08-30 17:53:14,893 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-30 17:53:14,894 INFO L302 CfgBuilder]: Removed 10 assume(true) statements. [2023-08-30 17:53:14,896 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.08 05:53:14 BoogieIcfgContainer [2023-08-30 17:53:14,897 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-30 17:53:14,899 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-30 17:53:14,900 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-08-30 17:53:14,903 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-08-30 17:53:14,903 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 30.08 05:53:13" (1/3) ... [2023-08-30 17:53:14,904 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68288f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.08 05:53:14, skipping insertion in model container [2023-08-30 17:53:14,904 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:53:14" (2/3) ... [2023-08-30 17:53:14,904 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68288f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.08 05:53:14, skipping insertion in model container [2023-08-30 17:53:14,905 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.08 05:53:14" (3/3) ... [2023-08-30 17:53:14,906 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_36-indirect_racefree.i [2023-08-30 17:53:14,913 WARN L145 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2023-08-30 17:53:14,921 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-30 17:53:14,922 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-08-30 17:53:14,922 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-30 17:53:14,997 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-08-30 17:53:15,026 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 102 places, 111 transitions, 230 flow [2023-08-30 17:53:15,107 INFO L130 PetriNetUnfolder]: 17/146 cut-off events. [2023-08-30 17:53:15,108 INFO L131 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2023-08-30 17:53:15,112 INFO L83 FinitePrefix]: Finished finitePrefix Result has 152 conditions, 146 events. 17/146 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 345 event pairs, 0 based on Foata normal form. 0/124 useless extension candidates. Maximal degree in co-relation 72. Up to 4 conditions per place. [2023-08-30 17:53:15,113 INFO L82 GeneralOperation]: Start removeDead. Operand has 102 places, 111 transitions, 230 flow [2023-08-30 17:53:15,118 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 98 places, 106 transitions, 217 flow [2023-08-30 17:53:15,122 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-30 17:53:15,130 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 98 places, 106 transitions, 217 flow [2023-08-30 17:53:15,132 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 98 places, 106 transitions, 217 flow [2023-08-30 17:53:15,132 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 98 places, 106 transitions, 217 flow [2023-08-30 17:53:15,178 INFO L130 PetriNetUnfolder]: 16/141 cut-off events. [2023-08-30 17:53:15,178 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-30 17:53:15,179 INFO L83 FinitePrefix]: Finished finitePrefix Result has 146 conditions, 141 events. 16/141 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 334 event pairs, 0 based on Foata normal form. 0/119 useless extension candidates. Maximal degree in co-relation 72. Up to 4 conditions per place. [2023-08-30 17:53:15,181 INFO L119 LiptonReduction]: Number of co-enabled transitions 2624 [2023-08-30 17:53:17,980 INFO L134 LiptonReduction]: Checked pairs total: 5236 [2023-08-30 17:53:17,980 INFO L136 LiptonReduction]: Total number of compositions: 89 [2023-08-30 17:53:17,994 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-30 17:53:17,999 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=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@60e9b8f, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-30 17:53:18,000 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-30 17:53:18,003 INFO L130 PetriNetUnfolder]: 0/10 cut-off events. [2023-08-30 17:53:18,003 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-30 17:53:18,003 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:53:18,004 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-30 17:53:18,004 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-30 17:53:18,009 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:53:18,009 INFO L85 PathProgramCache]: Analyzing trace with hash 13124765, now seen corresponding path program 1 times [2023-08-30 17:53:18,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:53:18,017 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1895746286] [2023-08-30 17:53:18,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:53:18,017 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:53:18,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:53:18,216 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:53:18,217 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-30 17:53:18,218 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1895746286] [2023-08-30 17:53:18,218 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1895746286] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-30 17:53:18,219 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-30 17:53:18,219 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-30 17:53:18,220 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442830084] [2023-08-30 17:53:18,221 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-30 17:53:18,228 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-30 17:53:18,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-30 17:53:18,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-30 17:53:18,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-30 17:53:18,274 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 93 out of 200 [2023-08-30 17:53:18,278 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 27 places, 32 transitions, 69 flow. Second operand has 3 states, 3 states have (on average 94.33333333333333) internal successors, (283), 3 states have internal predecessors, (283), 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) [2023-08-30 17:53:18,279 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-30 17:53:18,279 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 93 of 200 [2023-08-30 17:53:18,280 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-30 17:53:18,361 INFO L130 PetriNetUnfolder]: 80/204 cut-off events. [2023-08-30 17:53:18,362 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-30 17:53:18,365 INFO L83 FinitePrefix]: Finished finitePrefix Result has 401 conditions, 204 events. 80/204 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 872 event pairs, 0 based on Foata normal form. 9/191 useless extension candidates. Maximal degree in co-relation 368. Up to 169 conditions per place. [2023-08-30 17:53:18,367 INFO L137 encePairwiseOnDemand]: 188/200 looper letters, 25 selfloop transitions, 2 changer transitions 6/34 dead transitions. [2023-08-30 17:53:18,367 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 28 places, 34 transitions, 135 flow [2023-08-30 17:53:18,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-30 17:53:18,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-30 17:53:18,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 326 transitions. [2023-08-30 17:53:18,388 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5433333333333333 [2023-08-30 17:53:18,388 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 326 transitions. [2023-08-30 17:53:18,389 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 326 transitions. [2023-08-30 17:53:18,392 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-30 17:53:18,394 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 326 transitions. [2023-08-30 17:53:18,401 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 108.66666666666667) internal successors, (326), 3 states have internal predecessors, (326), 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) [2023-08-30 17:53:18,406 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 200.0) internal successors, (800), 4 states have internal predecessors, (800), 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) [2023-08-30 17:53:18,406 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 200.0) internal successors, (800), 4 states have internal predecessors, (800), 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) [2023-08-30 17:53:18,408 INFO L175 Difference]: Start difference. First operand has 27 places, 32 transitions, 69 flow. Second operand 3 states and 326 transitions. [2023-08-30 17:53:18,409 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 28 places, 34 transitions, 135 flow [2023-08-30 17:53:18,411 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 28 places, 34 transitions, 135 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-30 17:53:18,413 INFO L231 Difference]: Finished difference. Result has 29 places, 18 transitions, 47 flow [2023-08-30 17:53:18,414 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=200, PETRI_DIFFERENCE_MINUEND_FLOW=51, PETRI_DIFFERENCE_MINUEND_PLACES=26, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=23, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=21, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=47, PETRI_PLACES=29, PETRI_TRANSITIONS=18} [2023-08-30 17:53:18,418 INFO L281 CegarLoopForPetriNet]: 27 programPoint places, 2 predicate places. [2023-08-30 17:53:18,419 INFO L495 AbstractCegarLoop]: Abstraction has has 29 places, 18 transitions, 47 flow [2023-08-30 17:53:18,419 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 94.33333333333333) internal successors, (283), 3 states have internal predecessors, (283), 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) [2023-08-30 17:53:18,419 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:53:18,419 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-08-30 17:53:18,420 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-30 17:53:18,420 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-30 17:53:18,422 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:53:18,422 INFO L85 PathProgramCache]: Analyzing trace with hash 12069750, now seen corresponding path program 1 times [2023-08-30 17:53:18,423 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:53:18,423 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2101958807] [2023-08-30 17:53:18,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:53:18,426 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:53:18,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:53:18,529 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:53:18,529 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-30 17:53:18,530 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2101958807] [2023-08-30 17:53:18,530 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2101958807] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-30 17:53:18,530 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1496485378] [2023-08-30 17:53:18,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:53:18,531 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-30 17:53:18,531 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-30 17:53:18,534 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) [2023-08-30 17:53:18,543 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-08-30 17:53:18,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:53:18,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-30 17:53:18,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-08-30 17:53:18,643 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:53:18,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-08-30 17:53:18,659 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:53:18,660 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1496485378] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-30 17:53:18,660 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-30 17:53:18,660 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-30 17:53:18,661 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790708535] [2023-08-30 17:53:18,661 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-30 17:53:18,661 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-30 17:53:18,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-30 17:53:18,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-30 17:53:18,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-30 17:53:18,695 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 92 out of 200 [2023-08-30 17:53:18,696 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 29 places, 18 transitions, 47 flow. Second operand has 7 states, 7 states have (on average 94.28571428571429) internal successors, (660), 7 states have internal predecessors, (660), 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) [2023-08-30 17:53:18,696 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-30 17:53:18,696 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 92 of 200 [2023-08-30 17:53:18,696 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-30 17:53:18,771 INFO L130 PetriNetUnfolder]: 20/56 cut-off events. [2023-08-30 17:53:18,771 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-08-30 17:53:18,772 INFO L83 FinitePrefix]: Finished finitePrefix Result has 141 conditions, 56 events. 20/56 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 81 event pairs, 9 based on Foata normal form. 11/67 useless extension candidates. Maximal degree in co-relation 127. Up to 42 conditions per place. [2023-08-30 17:53:18,772 INFO L137 encePairwiseOnDemand]: 197/200 looper letters, 0 selfloop transitions, 0 changer transitions 26/26 dead transitions. [2023-08-30 17:53:18,772 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 24 places, 26 transitions, 111 flow [2023-08-30 17:53:18,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-30 17:53:18,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-30 17:53:18,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 394 transitions. [2023-08-30 17:53:18,774 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4925 [2023-08-30 17:53:18,774 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 394 transitions. [2023-08-30 17:53:18,774 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 394 transitions. [2023-08-30 17:53:18,775 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-30 17:53:18,775 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 394 transitions. [2023-08-30 17:53:18,776 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 98.5) internal successors, (394), 4 states have internal predecessors, (394), 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) [2023-08-30 17:53:18,778 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 200.0) internal successors, (1000), 5 states have internal predecessors, (1000), 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) [2023-08-30 17:53:18,779 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 200.0) internal successors, (1000), 5 states have internal predecessors, (1000), 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) [2023-08-30 17:53:18,779 INFO L175 Difference]: Start difference. First operand has 29 places, 18 transitions, 47 flow. Second operand 4 states and 394 transitions. [2023-08-30 17:53:18,779 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 24 places, 26 transitions, 111 flow [2023-08-30 17:53:18,780 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 21 places, 26 transitions, 105 flow, removed 0 selfloop flow, removed 3 redundant places. [2023-08-30 17:53:18,780 INFO L231 Difference]: Finished difference. Result has 21 places, 0 transitions, 0 flow [2023-08-30 17:53:18,780 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=200, PETRI_DIFFERENCE_MINUEND_FLOW=33, PETRI_DIFFERENCE_MINUEND_PLACES=18, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=15, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=15, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=0, PETRI_PLACES=21, PETRI_TRANSITIONS=0} [2023-08-30 17:53:18,781 INFO L281 CegarLoopForPetriNet]: 27 programPoint places, -6 predicate places. [2023-08-30 17:53:18,781 INFO L495 AbstractCegarLoop]: Abstraction has has 21 places, 0 transitions, 0 flow [2023-08-30 17:53:18,782 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 94.28571428571429) internal successors, (660), 7 states have internal predecessors, (660), 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) [2023-08-30 17:53:18,784 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-08-30 17:53:18,789 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-08-30 17:53:18,986 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-30 17:53:18,986 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1] [2023-08-30 17:53:18,989 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-08-30 17:53:18,993 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 102 places, 111 transitions, 230 flow [2023-08-30 17:53:19,009 INFO L130 PetriNetUnfolder]: 17/146 cut-off events. [2023-08-30 17:53:19,009 INFO L131 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2023-08-30 17:53:19,010 INFO L83 FinitePrefix]: Finished finitePrefix Result has 152 conditions, 146 events. 17/146 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 345 event pairs, 0 based on Foata normal form. 0/124 useless extension candidates. Maximal degree in co-relation 72. Up to 4 conditions per place. [2023-08-30 17:53:19,011 INFO L82 GeneralOperation]: Start removeDead. Operand has 102 places, 111 transitions, 230 flow [2023-08-30 17:53:19,012 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 98 places, 106 transitions, 217 flow [2023-08-30 17:53:19,012 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-30 17:53:19,012 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 98 places, 106 transitions, 217 flow [2023-08-30 17:53:19,014 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 98 places, 106 transitions, 217 flow [2023-08-30 17:53:19,014 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 98 places, 106 transitions, 217 flow [2023-08-30 17:53:19,028 INFO L130 PetriNetUnfolder]: 16/141 cut-off events. [2023-08-30 17:53:19,029 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-30 17:53:19,029 INFO L83 FinitePrefix]: Finished finitePrefix Result has 146 conditions, 141 events. 16/141 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 334 event pairs, 0 based on Foata normal form. 0/119 useless extension candidates. Maximal degree in co-relation 72. Up to 4 conditions per place. [2023-08-30 17:53:19,031 INFO L119 LiptonReduction]: Number of co-enabled transitions 2624 [2023-08-30 17:53:21,636 INFO L134 LiptonReduction]: Checked pairs total: 5236 [2023-08-30 17:53:21,636 INFO L136 LiptonReduction]: Total number of compositions: 89 [2023-08-30 17:53:21,638 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-30 17:53:21,639 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=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@60e9b8f, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-30 17:53:21,639 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-30 17:53:21,642 INFO L130 PetriNetUnfolder]: 2/21 cut-off events. [2023-08-30 17:53:21,642 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-30 17:53:21,643 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:53:21,643 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-08-30 17:53:21,643 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-30 17:53:21,643 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:53:21,643 INFO L85 PathProgramCache]: Analyzing trace with hash -1943242832, now seen corresponding path program 1 times [2023-08-30 17:53:21,644 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:53:21,644 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [413749802] [2023-08-30 17:53:21,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:53:21,644 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:53:21,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-30 17:53:21,678 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-30 17:53:21,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-30 17:53:21,719 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-30 17:53:21,719 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-30 17:53:21,719 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-30 17:53:21,720 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-08-30 17:53:21,720 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-30 17:53:21,721 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-30 17:53:21,721 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-30 17:53:21,721 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-30 17:53:21,736 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-08-30 17:53:21,739 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 131 places, 145 transitions, 308 flow [2023-08-30 17:53:21,759 INFO L130 PetriNetUnfolder]: 31/239 cut-off events. [2023-08-30 17:53:21,759 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-08-30 17:53:21,761 INFO L83 FinitePrefix]: Finished finitePrefix Result has 253 conditions, 239 events. 31/239 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 711 event pairs, 0 based on Foata normal form. 0/201 useless extension candidates. Maximal degree in co-relation 148. Up to 8 conditions per place. [2023-08-30 17:53:21,761 INFO L82 GeneralOperation]: Start removeDead. Operand has 131 places, 145 transitions, 308 flow [2023-08-30 17:53:21,762 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 131 places, 145 transitions, 308 flow [2023-08-30 17:53:21,763 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-30 17:53:21,763 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 131 places, 145 transitions, 308 flow [2023-08-30 17:53:21,763 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 131 places, 145 transitions, 308 flow [2023-08-30 17:53:21,763 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 131 places, 145 transitions, 308 flow [2023-08-30 17:53:21,783 INFO L130 PetriNetUnfolder]: 31/239 cut-off events. [2023-08-30 17:53:21,783 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-08-30 17:53:21,784 INFO L83 FinitePrefix]: Finished finitePrefix Result has 253 conditions, 239 events. 31/239 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 711 event pairs, 0 based on Foata normal form. 0/201 useless extension candidates. Maximal degree in co-relation 148. Up to 8 conditions per place. [2023-08-30 17:53:21,789 INFO L119 LiptonReduction]: Number of co-enabled transitions 8000 [2023-08-30 17:53:24,360 INFO L134 LiptonReduction]: Checked pairs total: 15997 [2023-08-30 17:53:24,361 INFO L136 LiptonReduction]: Total number of compositions: 109 [2023-08-30 17:53:24,362 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-30 17:53:24,363 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=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@60e9b8f, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-30 17:53:24,364 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-30 17:53:24,365 INFO L130 PetriNetUnfolder]: 0/8 cut-off events. [2023-08-30 17:53:24,365 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-30 17:53:24,366 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:53:24,366 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-30 17:53:24,366 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-30 17:53:24,366 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:53:24,366 INFO L85 PathProgramCache]: Analyzing trace with hash 24729059, now seen corresponding path program 1 times [2023-08-30 17:53:24,366 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:53:24,366 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [512460430] [2023-08-30 17:53:24,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:53:24,367 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:53:24,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:53:24,396 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:53:24,396 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-30 17:53:24,397 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [512460430] [2023-08-30 17:53:24,397 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [512460430] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-30 17:53:24,397 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-30 17:53:24,397 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-30 17:53:24,397 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584009414] [2023-08-30 17:53:24,397 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-30 17:53:24,398 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-30 17:53:24,398 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-30 17:53:24,398 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-30 17:53:24,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-30 17:53:24,406 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 119 out of 254 [2023-08-30 17:53:24,407 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 44 places, 55 transitions, 128 flow. Second operand has 3 states, 3 states have (on average 120.33333333333333) internal successors, (361), 3 states have internal predecessors, (361), 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) [2023-08-30 17:53:24,407 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-30 17:53:24,407 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 119 of 254 [2023-08-30 17:53:24,407 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-30 17:53:24,691 INFO L130 PetriNetUnfolder]: 1642/2913 cut-off events. [2023-08-30 17:53:24,691 INFO L131 PetriNetUnfolder]: For 48/48 co-relation queries the response was YES. [2023-08-30 17:53:24,694 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5667 conditions, 2913 events. 1642/2913 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 106. Compared 17159 event pairs, 752 based on Foata normal form. 428/3025 useless extension candidates. Maximal degree in co-relation 585. Up to 2673 conditions per place. [2023-08-30 17:53:24,700 INFO L137 encePairwiseOnDemand]: 237/254 looper letters, 32 selfloop transitions, 2 changer transitions 10/51 dead transitions. [2023-08-30 17:53:24,701 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 46 places, 51 transitions, 204 flow [2023-08-30 17:53:24,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-30 17:53:24,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-30 17:53:24,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 420 transitions. [2023-08-30 17:53:24,703 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5511811023622047 [2023-08-30 17:53:24,703 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 420 transitions. [2023-08-30 17:53:24,703 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 420 transitions. [2023-08-30 17:53:24,703 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-30 17:53:24,704 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 420 transitions. [2023-08-30 17:53:24,705 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 140.0) internal successors, (420), 3 states have internal predecessors, (420), 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) [2023-08-30 17:53:24,707 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 254.0) internal successors, (1016), 4 states have internal predecessors, (1016), 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) [2023-08-30 17:53:24,708 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 254.0) internal successors, (1016), 4 states have internal predecessors, (1016), 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) [2023-08-30 17:53:24,708 INFO L175 Difference]: Start difference. First operand has 44 places, 55 transitions, 128 flow. Second operand 3 states and 420 transitions. [2023-08-30 17:53:24,708 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 46 places, 51 transitions, 204 flow [2023-08-30 17:53:24,710 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 46 places, 51 transitions, 204 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-30 17:53:24,711 INFO L231 Difference]: Finished difference. Result has 47 places, 32 transitions, 82 flow [2023-08-30 17:53:24,711 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=254, PETRI_DIFFERENCE_MINUEND_FLOW=100, PETRI_DIFFERENCE_MINUEND_PLACES=44, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=41, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=39, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=82, PETRI_PLACES=47, PETRI_TRANSITIONS=32} [2023-08-30 17:53:24,713 INFO L281 CegarLoopForPetriNet]: 44 programPoint places, 3 predicate places. [2023-08-30 17:53:24,713 INFO L495 AbstractCegarLoop]: Abstraction has has 47 places, 32 transitions, 82 flow [2023-08-30 17:53:24,714 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 120.33333333333333) internal successors, (361), 3 states have internal predecessors, (361), 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) [2023-08-30 17:53:24,714 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:53:24,714 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-08-30 17:53:24,714 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-30 17:53:24,716 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-30 17:53:24,716 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:53:24,716 INFO L85 PathProgramCache]: Analyzing trace with hash 603105024, now seen corresponding path program 1 times [2023-08-30 17:53:24,717 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:53:24,719 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [595841829] [2023-08-30 17:53:24,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:53:24,720 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:53:24,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:53:24,804 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:53:24,804 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-30 17:53:24,805 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [595841829] [2023-08-30 17:53:24,805 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [595841829] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-30 17:53:24,805 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1065142457] [2023-08-30 17:53:24,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:53:24,806 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-30 17:53:24,806 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-30 17:53:24,807 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) [2023-08-30 17:53:24,827 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-08-30 17:53:24,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:53:24,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-30 17:53:24,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-08-30 17:53:24,889 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:53:24,890 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-08-30 17:53:24,909 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:53:24,909 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1065142457] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-30 17:53:24,909 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-30 17:53:24,909 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-30 17:53:24,910 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205115525] [2023-08-30 17:53:24,910 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-30 17:53:24,910 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-30 17:53:24,911 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-30 17:53:24,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-30 17:53:24,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-30 17:53:24,931 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 118 out of 254 [2023-08-30 17:53:24,933 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 47 places, 32 transitions, 82 flow. Second operand has 7 states, 7 states have (on average 120.28571428571429) internal successors, (842), 7 states have internal predecessors, (842), 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) [2023-08-30 17:53:24,933 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-30 17:53:24,933 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 118 of 254 [2023-08-30 17:53:24,933 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-30 17:53:25,044 INFO L130 PetriNetUnfolder]: 376/688 cut-off events. [2023-08-30 17:53:25,044 INFO L131 PetriNetUnfolder]: For 99/99 co-relation queries the response was YES. [2023-08-30 17:53:25,045 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1471 conditions, 688 events. 376/688 cut-off events. For 99/99 co-relation queries the response was YES. Maximal size of possible extension queue 32. Compared 3181 event pairs, 0 based on Foata normal form. 90/778 useless extension candidates. Maximal degree in co-relation 163. Up to 450 conditions per place. [2023-08-30 17:53:25,046 INFO L137 encePairwiseOnDemand]: 251/254 looper letters, 0 selfloop transitions, 0 changer transitions 55/55 dead transitions. [2023-08-30 17:53:25,046 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 40 places, 55 transitions, 222 flow [2023-08-30 17:53:25,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-30 17:53:25,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-30 17:53:25,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 640 transitions. [2023-08-30 17:53:25,048 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5039370078740157 [2023-08-30 17:53:25,048 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 640 transitions. [2023-08-30 17:53:25,049 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 640 transitions. [2023-08-30 17:53:25,049 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-30 17:53:25,049 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 640 transitions. [2023-08-30 17:53:25,051 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 128.0) internal successors, (640), 5 states have internal predecessors, (640), 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) [2023-08-30 17:53:25,053 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 254.0) internal successors, (1524), 6 states have internal predecessors, (1524), 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) [2023-08-30 17:53:25,053 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 254.0) internal successors, (1524), 6 states have internal predecessors, (1524), 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) [2023-08-30 17:53:25,054 INFO L175 Difference]: Start difference. First operand has 47 places, 32 transitions, 82 flow. Second operand 5 states and 640 transitions. [2023-08-30 17:53:25,054 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 40 places, 55 transitions, 222 flow [2023-08-30 17:53:25,055 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 39 places, 55 transitions, 220 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-30 17:53:25,056 INFO L231 Difference]: Finished difference. Result has 39 places, 0 transitions, 0 flow [2023-08-30 17:53:25,056 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=254, PETRI_DIFFERENCE_MINUEND_FLOW=72, PETRI_DIFFERENCE_MINUEND_PLACES=35, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=29, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=29, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=0, PETRI_PLACES=39, PETRI_TRANSITIONS=0} [2023-08-30 17:53:25,059 INFO L281 CegarLoopForPetriNet]: 44 programPoint places, -5 predicate places. [2023-08-30 17:53:25,060 INFO L495 AbstractCegarLoop]: Abstraction has has 39 places, 0 transitions, 0 flow [2023-08-30 17:53:25,060 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 120.28571428571429) internal successors, (842), 7 states have internal predecessors, (842), 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) [2023-08-30 17:53:25,060 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-08-30 17:53:25,068 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-08-30 17:53:25,265 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-30 17:53:25,266 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1] [2023-08-30 17:53:25,266 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-08-30 17:53:25,268 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 131 places, 145 transitions, 308 flow [2023-08-30 17:53:25,294 INFO L130 PetriNetUnfolder]: 31/239 cut-off events. [2023-08-30 17:53:25,294 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-08-30 17:53:25,295 INFO L83 FinitePrefix]: Finished finitePrefix Result has 253 conditions, 239 events. 31/239 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 711 event pairs, 0 based on Foata normal form. 0/201 useless extension candidates. Maximal degree in co-relation 148. Up to 8 conditions per place. [2023-08-30 17:53:25,295 INFO L82 GeneralOperation]: Start removeDead. Operand has 131 places, 145 transitions, 308 flow [2023-08-30 17:53:25,296 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 131 places, 145 transitions, 308 flow [2023-08-30 17:53:25,296 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-30 17:53:25,296 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 131 places, 145 transitions, 308 flow [2023-08-30 17:53:25,297 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 131 places, 145 transitions, 308 flow [2023-08-30 17:53:25,297 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 131 places, 145 transitions, 308 flow [2023-08-30 17:53:25,314 INFO L130 PetriNetUnfolder]: 31/239 cut-off events. [2023-08-30 17:53:25,314 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-08-30 17:53:25,315 INFO L83 FinitePrefix]: Finished finitePrefix Result has 253 conditions, 239 events. 31/239 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 711 event pairs, 0 based on Foata normal form. 0/201 useless extension candidates. Maximal degree in co-relation 148. Up to 8 conditions per place. [2023-08-30 17:53:25,320 INFO L119 LiptonReduction]: Number of co-enabled transitions 8000 [2023-08-30 17:53:27,666 INFO L134 LiptonReduction]: Checked pairs total: 16298 [2023-08-30 17:53:27,666 INFO L136 LiptonReduction]: Total number of compositions: 111 [2023-08-30 17:53:27,668 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-30 17:53:27,668 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=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@60e9b8f, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-30 17:53:27,668 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-30 17:53:27,672 INFO L130 PetriNetUnfolder]: 10/56 cut-off events. [2023-08-30 17:53:27,672 INFO L131 PetriNetUnfolder]: For 3/3 co-relation queries the response was YES. [2023-08-30 17:53:27,672 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:53:27,673 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-08-30 17:53:27,673 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-30 17:53:27,673 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:53:27,673 INFO L85 PathProgramCache]: Analyzing trace with hash 424442762, now seen corresponding path program 1 times [2023-08-30 17:53:27,673 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:53:27,673 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1009771894] [2023-08-30 17:53:27,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:53:27,674 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:53:27,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-30 17:53:27,695 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-30 17:53:27,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-30 17:53:27,707 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-30 17:53:27,708 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-30 17:53:27,708 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-30 17:53:27,708 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-30 17:53:27,708 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-30 17:53:27,709 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-30 17:53:27,709 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-30 17:53:27,709 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-30 17:53:27,725 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-08-30 17:53:27,727 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 160 places, 179 transitions, 388 flow [2023-08-30 17:53:27,781 INFO L130 PetriNetUnfolder]: 50/363 cut-off events. [2023-08-30 17:53:27,782 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-08-30 17:53:27,783 INFO L83 FinitePrefix]: Finished finitePrefix Result has 391 conditions, 363 events. 50/363 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1208 event pairs, 1 based on Foata normal form. 0/305 useless extension candidates. Maximal degree in co-relation 247. Up to 16 conditions per place. [2023-08-30 17:53:27,783 INFO L82 GeneralOperation]: Start removeDead. Operand has 160 places, 179 transitions, 388 flow [2023-08-30 17:53:27,785 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 160 places, 179 transitions, 388 flow [2023-08-30 17:53:27,785 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-30 17:53:27,785 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 160 places, 179 transitions, 388 flow [2023-08-30 17:53:27,786 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 160 places, 179 transitions, 388 flow [2023-08-30 17:53:27,786 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 160 places, 179 transitions, 388 flow [2023-08-30 17:53:27,815 INFO L130 PetriNetUnfolder]: 50/363 cut-off events. [2023-08-30 17:53:27,815 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-08-30 17:53:27,817 INFO L83 FinitePrefix]: Finished finitePrefix Result has 391 conditions, 363 events. 50/363 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1208 event pairs, 1 based on Foata normal form. 0/305 useless extension candidates. Maximal degree in co-relation 247. Up to 16 conditions per place. [2023-08-30 17:53:27,828 INFO L119 LiptonReduction]: Number of co-enabled transitions 15360 [2023-08-30 17:53:30,393 INFO L134 LiptonReduction]: Checked pairs total: 34439 [2023-08-30 17:53:30,394 INFO L136 LiptonReduction]: Total number of compositions: 129 [2023-08-30 17:53:30,395 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-30 17:53:30,396 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=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@60e9b8f, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-30 17:53:30,396 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-30 17:53:30,398 INFO L130 PetriNetUnfolder]: 0/8 cut-off events. [2023-08-30 17:53:30,398 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-30 17:53:30,398 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:53:30,398 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-30 17:53:30,398 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-30 17:53:30,399 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:53:30,399 INFO L85 PathProgramCache]: Analyzing trace with hash 38674866, now seen corresponding path program 1 times [2023-08-30 17:53:30,399 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:53:30,399 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1560431169] [2023-08-30 17:53:30,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:53:30,399 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:53:30,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:53:30,437 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:53:30,437 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-30 17:53:30,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1560431169] [2023-08-30 17:53:30,437 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1560431169] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-30 17:53:30,438 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-30 17:53:30,438 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-30 17:53:30,438 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72407515] [2023-08-30 17:53:30,439 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-30 17:53:30,439 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-30 17:53:30,439 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-30 17:53:30,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-30 17:53:30,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-30 17:53:30,447 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 145 out of 308 [2023-08-30 17:53:30,448 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 58 places, 74 transitions, 178 flow. Second operand has 3 states, 3 states have (on average 146.33333333333334) internal successors, (439), 3 states have internal predecessors, (439), 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) [2023-08-30 17:53:30,448 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-30 17:53:30,448 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 145 of 308 [2023-08-30 17:53:30,448 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-30 17:53:33,576 INFO L130 PetriNetUnfolder]: 32280/46590 cut-off events. [2023-08-30 17:53:33,576 INFO L131 PetriNetUnfolder]: For 1317/1317 co-relation queries the response was YES. [2023-08-30 17:53:33,629 INFO L83 FinitePrefix]: Finished finitePrefix Result has 92819 conditions, 46590 events. 32280/46590 cut-off events. For 1317/1317 co-relation queries the response was YES. Maximal size of possible extension queue 1061. Compared 302760 event pairs, 21006 based on Foata normal form. 5103/47961 useless extension candidates. Maximal degree in co-relation 7949. Up to 45346 conditions per place. [2023-08-30 17:53:33,725 INFO L137 encePairwiseOnDemand]: 285/308 looper letters, 44 selfloop transitions, 2 changer transitions 11/64 dead transitions. [2023-08-30 17:53:33,725 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 60 places, 64 transitions, 268 flow [2023-08-30 17:53:33,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-30 17:53:33,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-30 17:53:33,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 517 transitions. [2023-08-30 17:53:33,728 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5595238095238095 [2023-08-30 17:53:33,728 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 517 transitions. [2023-08-30 17:53:33,728 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 517 transitions. [2023-08-30 17:53:33,728 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-30 17:53:33,728 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 517 transitions. [2023-08-30 17:53:33,730 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 172.33333333333334) internal successors, (517), 3 states have internal predecessors, (517), 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) [2023-08-30 17:53:33,732 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 308.0) internal successors, (1232), 4 states have internal predecessors, (1232), 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) [2023-08-30 17:53:33,732 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 308.0) internal successors, (1232), 4 states have internal predecessors, (1232), 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) [2023-08-30 17:53:33,732 INFO L175 Difference]: Start difference. First operand has 58 places, 74 transitions, 178 flow. Second operand 3 states and 517 transitions. [2023-08-30 17:53:33,732 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 60 places, 64 transitions, 268 flow [2023-08-30 17:53:33,737 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 60 places, 64 transitions, 268 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-30 17:53:33,739 INFO L231 Difference]: Finished difference. Result has 61 places, 44 transitions, 113 flow [2023-08-30 17:53:33,739 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=308, PETRI_DIFFERENCE_MINUEND_FLOW=138, PETRI_DIFFERENCE_MINUEND_PLACES=58, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=54, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=52, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=113, PETRI_PLACES=61, PETRI_TRANSITIONS=44} [2023-08-30 17:53:33,740 INFO L281 CegarLoopForPetriNet]: 58 programPoint places, 3 predicate places. [2023-08-30 17:53:33,740 INFO L495 AbstractCegarLoop]: Abstraction has has 61 places, 44 transitions, 113 flow [2023-08-30 17:53:33,741 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 146.33333333333334) internal successors, (439), 3 states have internal predecessors, (439), 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) [2023-08-30 17:53:33,741 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:53:33,741 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-08-30 17:53:33,741 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-08-30 17:53:33,741 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-30 17:53:33,742 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:53:33,742 INFO L85 PathProgramCache]: Analyzing trace with hash -1141297874, now seen corresponding path program 1 times [2023-08-30 17:53:33,742 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:53:33,742 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [403591726] [2023-08-30 17:53:33,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:53:33,743 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:53:33,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:53:33,792 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:53:33,793 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-30 17:53:33,793 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [403591726] [2023-08-30 17:53:33,793 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [403591726] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-30 17:53:33,793 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [105176021] [2023-08-30 17:53:33,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:53:33,794 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-30 17:53:33,794 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-30 17:53:33,797 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) [2023-08-30 17:53:33,826 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-08-30 17:53:33,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:53:33,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-30 17:53:33,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-08-30 17:53:33,886 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:53:33,886 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-08-30 17:53:33,902 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:53:33,903 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [105176021] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-30 17:53:33,903 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-30 17:53:33,903 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-30 17:53:33,903 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398500912] [2023-08-30 17:53:33,903 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-30 17:53:33,903 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-30 17:53:33,904 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-30 17:53:33,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-30 17:53:33,910 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-30 17:53:33,925 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 144 out of 308 [2023-08-30 17:53:33,926 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 61 places, 44 transitions, 113 flow. Second operand has 7 states, 7 states have (on average 146.28571428571428) internal successors, (1024), 7 states have internal predecessors, (1024), 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) [2023-08-30 17:53:33,926 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-30 17:53:33,927 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 144 of 308 [2023-08-30 17:53:33,927 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-30 17:53:34,642 INFO L130 PetriNetUnfolder]: 7582/11197 cut-off events. [2023-08-30 17:53:34,642 INFO L131 PetriNetUnfolder]: For 1404/1404 co-relation queries the response was YES. [2023-08-30 17:53:34,653 INFO L83 FinitePrefix]: Finished finitePrefix Result has 23615 conditions, 11197 events. 7582/11197 cut-off events. For 1404/1404 co-relation queries the response was YES. Maximal size of possible extension queue 319. Compared 65213 event pairs, 0 based on Foata normal form. 1098/12295 useless extension candidates. Maximal degree in co-relation 2698. Up to 7322 conditions per place. [2023-08-30 17:53:34,660 INFO L137 encePairwiseOnDemand]: 305/308 looper letters, 0 selfloop transitions, 0 changer transitions 98/98 dead transitions. [2023-08-30 17:53:34,660 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 55 places, 98 transitions, 403 flow [2023-08-30 17:53:34,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-30 17:53:34,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-30 17:53:34,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 958 transitions. [2023-08-30 17:53:34,663 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5183982683982684 [2023-08-30 17:53:34,663 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 958 transitions. [2023-08-30 17:53:34,664 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 958 transitions. [2023-08-30 17:53:34,664 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-30 17:53:34,664 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 958 transitions. [2023-08-30 17:53:34,667 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 159.66666666666666) internal successors, (958), 6 states have internal predecessors, (958), 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) [2023-08-30 17:53:34,670 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 308.0) internal successors, (2156), 7 states have internal predecessors, (2156), 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) [2023-08-30 17:53:34,671 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 308.0) internal successors, (2156), 7 states have internal predecessors, (2156), 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) [2023-08-30 17:53:34,671 INFO L175 Difference]: Start difference. First operand has 61 places, 44 transitions, 113 flow. Second operand 6 states and 958 transitions. [2023-08-30 17:53:34,671 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 55 places, 98 transitions, 403 flow [2023-08-30 17:53:34,672 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 54 places, 98 transitions, 399 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-08-30 17:53:34,673 INFO L231 Difference]: Finished difference. Result has 54 places, 0 transitions, 0 flow [2023-08-30 17:53:34,673 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=308, PETRI_DIFFERENCE_MINUEND_FLOW=101, PETRI_DIFFERENCE_MINUEND_PLACES=49, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=41, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=41, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=0, PETRI_PLACES=54, PETRI_TRANSITIONS=0} [2023-08-30 17:53:34,674 INFO L281 CegarLoopForPetriNet]: 58 programPoint places, -4 predicate places. [2023-08-30 17:53:34,674 INFO L495 AbstractCegarLoop]: Abstraction has has 54 places, 0 transitions, 0 flow [2023-08-30 17:53:34,674 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 146.28571428571428) internal successors, (1024), 7 states have internal predecessors, (1024), 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) [2023-08-30 17:53:34,674 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-08-30 17:53:34,685 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-08-30 17:53:34,879 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-30 17:53:34,880 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1] [2023-08-30 17:53:34,880 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-08-30 17:53:34,882 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 160 places, 179 transitions, 388 flow [2023-08-30 17:53:34,909 INFO L130 PetriNetUnfolder]: 50/363 cut-off events. [2023-08-30 17:53:34,909 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-08-30 17:53:34,911 INFO L83 FinitePrefix]: Finished finitePrefix Result has 391 conditions, 363 events. 50/363 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1208 event pairs, 1 based on Foata normal form. 0/305 useless extension candidates. Maximal degree in co-relation 247. Up to 16 conditions per place. [2023-08-30 17:53:34,912 INFO L82 GeneralOperation]: Start removeDead. Operand has 160 places, 179 transitions, 388 flow [2023-08-30 17:53:34,913 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 160 places, 179 transitions, 388 flow [2023-08-30 17:53:34,914 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-30 17:53:34,914 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 160 places, 179 transitions, 388 flow [2023-08-30 17:53:34,914 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 160 places, 179 transitions, 388 flow [2023-08-30 17:53:34,914 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 160 places, 179 transitions, 388 flow [2023-08-30 17:53:34,939 INFO L130 PetriNetUnfolder]: 50/363 cut-off events. [2023-08-30 17:53:34,940 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-08-30 17:53:34,942 INFO L83 FinitePrefix]: Finished finitePrefix Result has 391 conditions, 363 events. 50/363 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1208 event pairs, 1 based on Foata normal form. 0/305 useless extension candidates. Maximal degree in co-relation 247. Up to 16 conditions per place. [2023-08-30 17:53:34,950 INFO L119 LiptonReduction]: Number of co-enabled transitions 15360 [2023-08-30 17:53:37,531 INFO L134 LiptonReduction]: Checked pairs total: 33902 [2023-08-30 17:53:37,532 INFO L136 LiptonReduction]: Total number of compositions: 129 [2023-08-30 17:53:37,533 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-30 17:53:37,534 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=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@60e9b8f, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-30 17:53:37,534 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-30 17:53:37,541 INFO L130 PetriNetUnfolder]: 19/91 cut-off events. [2023-08-30 17:53:37,542 INFO L131 PetriNetUnfolder]: For 10/10 co-relation queries the response was YES. [2023-08-30 17:53:37,542 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:53:37,542 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1] [2023-08-30 17:53:37,542 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-30 17:53:37,542 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:53:37,543 INFO L85 PathProgramCache]: Analyzing trace with hash 85919990, now seen corresponding path program 1 times [2023-08-30 17:53:37,543 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:53:37,543 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1388347263] [2023-08-30 17:53:37,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:53:37,543 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:53:37,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-30 17:53:37,557 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-30 17:53:37,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-30 17:53:37,571 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-30 17:53:37,571 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-30 17:53:37,572 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-30 17:53:37,572 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-30 17:53:37,572 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-30 17:53:37,573 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-30 17:53:37,573 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-30 17:53:37,573 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-30 17:53:37,595 INFO L144 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2023-08-30 17:53:37,597 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 189 places, 213 transitions, 470 flow [2023-08-30 17:53:37,678 INFO L130 PetriNetUnfolder]: 81/551 cut-off events. [2023-08-30 17:53:37,678 INFO L131 PetriNetUnfolder]: For 48/48 co-relation queries the response was YES. [2023-08-30 17:53:37,683 INFO L83 FinitePrefix]: Finished finitePrefix Result has 606 conditions, 551 events. 81/551 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2139 event pairs, 6 based on Foata normal form. 0/465 useless extension candidates. Maximal degree in co-relation 383. Up to 32 conditions per place. [2023-08-30 17:53:37,683 INFO L82 GeneralOperation]: Start removeDead. Operand has 189 places, 213 transitions, 470 flow [2023-08-30 17:53:37,687 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 189 places, 213 transitions, 470 flow [2023-08-30 17:53:37,687 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-30 17:53:37,687 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 189 places, 213 transitions, 470 flow [2023-08-30 17:53:37,687 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 189 places, 213 transitions, 470 flow [2023-08-30 17:53:37,687 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 189 places, 213 transitions, 470 flow [2023-08-30 17:53:37,735 INFO L130 PetriNetUnfolder]: 81/551 cut-off events. [2023-08-30 17:53:37,735 INFO L131 PetriNetUnfolder]: For 48/48 co-relation queries the response was YES. [2023-08-30 17:53:37,740 INFO L83 FinitePrefix]: Finished finitePrefix Result has 606 conditions, 551 events. 81/551 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2139 event pairs, 6 based on Foata normal form. 0/465 useless extension candidates. Maximal degree in co-relation 383. Up to 32 conditions per place. [2023-08-30 17:53:37,753 INFO L119 LiptonReduction]: Number of co-enabled transitions 24960 [2023-08-30 17:53:40,336 INFO L134 LiptonReduction]: Checked pairs total: 64732 [2023-08-30 17:53:40,336 INFO L136 LiptonReduction]: Total number of compositions: 150 [2023-08-30 17:53:40,337 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-30 17:53:40,337 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=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@60e9b8f, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-30 17:53:40,337 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-30 17:53:40,339 INFO L130 PetriNetUnfolder]: 0/6 cut-off events. [2023-08-30 17:53:40,339 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-30 17:53:40,339 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:53:40,339 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-30 17:53:40,339 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-30 17:53:40,339 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:53:40,339 INFO L85 PathProgramCache]: Analyzing trace with hash 54867992, now seen corresponding path program 1 times [2023-08-30 17:53:40,340 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:53:40,340 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1692561120] [2023-08-30 17:53:40,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:53:40,340 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:53:40,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:53:40,374 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:53:40,374 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-30 17:53:40,374 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1692561120] [2023-08-30 17:53:40,375 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1692561120] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-30 17:53:40,375 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-30 17:53:40,375 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-30 17:53:40,375 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887983204] [2023-08-30 17:53:40,375 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-30 17:53:40,376 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-30 17:53:40,376 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-30 17:53:40,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-30 17:53:40,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-30 17:53:40,385 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 171 out of 363 [2023-08-30 17:53:40,385 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 72 places, 93 transitions, 230 flow. Second operand has 3 states, 3 states have (on average 172.33333333333334) internal successors, (517), 3 states have internal predecessors, (517), 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) [2023-08-30 17:53:40,386 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-30 17:53:40,386 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 171 of 363 [2023-08-30 17:53:40,386 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-30 17:54:16,594 INFO L130 PetriNetUnfolder]: 411276/561314 cut-off events. [2023-08-30 17:54:16,594 INFO L131 PetriNetUnfolder]: For 20950/20950 co-relation queries the response was YES. [2023-08-30 17:54:17,327 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1108130 conditions, 561314 events. 411276/561314 cut-off events. For 20950/20950 co-relation queries the response was YES. Maximal size of possible extension queue 10645. Compared 4256228 event pairs, 302497 based on Foata normal form. 85320/609593 useless extension candidates. Maximal degree in co-relation 94407. Up to 535317 conditions per place. [2023-08-30 17:54:18,343 INFO L137 encePairwiseOnDemand]: 334/363 looper letters, 54 selfloop transitions, 2 changer transitions 12/78 dead transitions. [2023-08-30 17:54:18,343 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 74 places, 78 transitions, 332 flow [2023-08-30 17:54:18,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-30 17:54:18,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-30 17:54:18,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 612 transitions. [2023-08-30 17:54:18,346 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5619834710743802 [2023-08-30 17:54:18,346 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 612 transitions. [2023-08-30 17:54:18,346 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 612 transitions. [2023-08-30 17:54:18,346 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-30 17:54:18,346 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 612 transitions. [2023-08-30 17:54:18,348 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 204.0) internal successors, (612), 3 states have internal predecessors, (612), 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) [2023-08-30 17:54:18,349 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 363.0) internal successors, (1452), 4 states have internal predecessors, (1452), 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) [2023-08-30 17:54:18,350 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 363.0) internal successors, (1452), 4 states have internal predecessors, (1452), 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) [2023-08-30 17:54:18,350 INFO L175 Difference]: Start difference. First operand has 72 places, 93 transitions, 230 flow. Second operand 3 states and 612 transitions. [2023-08-30 17:54:18,350 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 74 places, 78 transitions, 332 flow [2023-08-30 17:54:18,354 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 74 places, 78 transitions, 332 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-30 17:54:18,356 INFO L231 Difference]: Finished difference. Result has 75 places, 56 transitions, 146 flow [2023-08-30 17:54:18,356 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=363, PETRI_DIFFERENCE_MINUEND_FLOW=178, PETRI_DIFFERENCE_MINUEND_PLACES=72, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=67, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=65, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=146, PETRI_PLACES=75, PETRI_TRANSITIONS=56} [2023-08-30 17:54:18,356 INFO L281 CegarLoopForPetriNet]: 72 programPoint places, 3 predicate places. [2023-08-30 17:54:18,357 INFO L495 AbstractCegarLoop]: Abstraction has has 75 places, 56 transitions, 146 flow [2023-08-30 17:54:18,357 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 172.33333333333334) internal successors, (517), 3 states have internal predecessors, (517), 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) [2023-08-30 17:54:18,357 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:54:18,357 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-08-30 17:54:18,357 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-08-30 17:54:18,358 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-30 17:54:18,358 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:54:18,358 INFO L85 PathProgramCache]: Analyzing trace with hash 1533718712, now seen corresponding path program 1 times [2023-08-30 17:54:18,358 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:54:18,358 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1677094812] [2023-08-30 17:54:18,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:54:18,359 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:54:18,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:54:18,401 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:54:18,402 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-30 17:54:18,402 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1677094812] [2023-08-30 17:54:18,402 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1677094812] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-30 17:54:18,402 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1866061000] [2023-08-30 17:54:18,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:54:18,402 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-30 17:54:18,402 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-30 17:54:18,404 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) [2023-08-30 17:54:18,406 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-08-30 17:54:18,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:54:18,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-30 17:54:18,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-08-30 17:54:18,487 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:54:18,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-08-30 17:54:18,508 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:54:18,508 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1866061000] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-30 17:54:18,508 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-30 17:54:18,509 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-30 17:54:18,509 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044941889] [2023-08-30 17:54:18,509 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-30 17:54:18,509 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-30 17:54:18,510 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-30 17:54:18,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-30 17:54:18,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-30 17:54:18,525 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 170 out of 363 [2023-08-30 17:54:18,526 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 75 places, 56 transitions, 146 flow. Second operand has 7 states, 7 states have (on average 172.28571428571428) internal successors, (1206), 7 states have internal predecessors, (1206), 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) [2023-08-30 17:54:18,527 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-30 17:54:18,527 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 170 of 363 [2023-08-30 17:54:18,527 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-30 17:54:32,723 INFO L130 PetriNetUnfolder]: 191482/255653 cut-off events. [2023-08-30 17:54:32,723 INFO L131 PetriNetUnfolder]: For 16322/16322 co-relation queries the response was YES. [2023-08-30 17:54:33,069 INFO L83 FinitePrefix]: Finished finitePrefix Result has 528298 conditions, 255653 events. 191482/255653 cut-off events. For 16322/16322 co-relation queries the response was YES. Maximal size of possible extension queue 5431. Compared 1768084 event pairs, 8016 based on Foata normal form. 1110/256762 useless extension candidates. Maximal degree in co-relation 474263. Up to 163477 conditions per place. [2023-08-30 17:54:33,779 INFO L137 encePairwiseOnDemand]: 359/363 looper letters, 136 selfloop transitions, 5 changer transitions 1/152 dead transitions. [2023-08-30 17:54:33,780 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 72 places, 152 transitions, 626 flow [2023-08-30 17:54:33,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-30 17:54:33,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-30 17:54:33,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1165 transitions. [2023-08-30 17:54:33,782 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5348943985307621 [2023-08-30 17:54:33,782 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1165 transitions. [2023-08-30 17:54:33,782 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1165 transitions. [2023-08-30 17:54:33,783 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-30 17:54:33,783 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1165 transitions. [2023-08-30 17:54:33,784 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 194.16666666666666) internal successors, (1165), 6 states have internal predecessors, (1165), 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) [2023-08-30 17:54:33,787 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 363.0) internal successors, (2541), 7 states have internal predecessors, (2541), 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) [2023-08-30 17:54:33,788 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 363.0) internal successors, (2541), 7 states have internal predecessors, (2541), 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) [2023-08-30 17:54:33,788 INFO L175 Difference]: Start difference. First operand has 75 places, 56 transitions, 146 flow. Second operand 6 states and 1165 transitions. [2023-08-30 17:54:33,788 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 72 places, 152 transitions, 626 flow [2023-08-30 17:54:33,793 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 71 places, 152 transitions, 618 flow, removed 3 selfloop flow, removed 1 redundant places. [2023-08-30 17:54:33,795 INFO L231 Difference]: Finished difference. Result has 75 places, 58 transitions, 172 flow [2023-08-30 17:54:33,795 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=363, PETRI_DIFFERENCE_MINUEND_FLOW=138, PETRI_DIFFERENCE_MINUEND_PLACES=66, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=56, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=53, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=172, PETRI_PLACES=75, PETRI_TRANSITIONS=58} [2023-08-30 17:54:33,796 INFO L281 CegarLoopForPetriNet]: 72 programPoint places, 3 predicate places. [2023-08-30 17:54:33,796 INFO L495 AbstractCegarLoop]: Abstraction has has 75 places, 58 transitions, 172 flow [2023-08-30 17:54:33,797 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 172.28571428571428) internal successors, (1206), 7 states have internal predecessors, (1206), 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) [2023-08-30 17:54:33,797 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:54:33,797 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-30 17:54:33,803 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-08-30 17:54:34,002 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-30 17:54:34,003 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-30 17:54:34,003 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:54:34,003 INFO L85 PathProgramCache]: Analyzing trace with hash 1945792594, now seen corresponding path program 1 times [2023-08-30 17:54:34,003 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:54:34,003 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [397797938] [2023-08-30 17:54:34,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:54:34,003 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:54:34,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:54:34,085 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:54:34,085 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-30 17:54:34,085 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [397797938] [2023-08-30 17:54:34,085 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [397797938] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-30 17:54:34,085 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [753598278] [2023-08-30 17:54:34,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:54:34,086 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-30 17:54:34,086 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-30 17:54:34,087 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) [2023-08-30 17:54:34,092 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-08-30 17:54:34,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:54:34,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 6 conjunts are in the unsatisfiable core [2023-08-30 17:54:34,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-08-30 17:54:34,207 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:54:34,207 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-08-30 17:54:34,264 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:54:34,264 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [753598278] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-30 17:54:34,264 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-30 17:54:34,264 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-08-30 17:54:34,265 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582386836] [2023-08-30 17:54:34,265 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-30 17:54:34,265 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-08-30 17:54:34,265 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-30 17:54:34,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-08-30 17:54:34,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-08-30 17:54:34,295 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 170 out of 363 [2023-08-30 17:54:34,297 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 75 places, 58 transitions, 172 flow. Second operand has 13 states, 13 states have (on average 172.6153846153846) internal successors, (2244), 13 states have internal predecessors, (2244), 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) [2023-08-30 17:54:34,297 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-30 17:54:34,297 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 170 of 363 [2023-08-30 17:54:34,297 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-30 17:54:39,556 INFO L130 PetriNetUnfolder]: 63646/89221 cut-off events. [2023-08-30 17:54:39,557 INFO L131 PetriNetUnfolder]: For 70140/70140 co-relation queries the response was YES. [2023-08-30 17:54:39,731 INFO L83 FinitePrefix]: Finished finitePrefix Result has 208526 conditions, 89221 events. 63646/89221 cut-off events. For 70140/70140 co-relation queries the response was YES. Maximal size of possible extension queue 2076. Compared 602351 event pairs, 0 based on Foata normal form. 8910/98130 useless extension candidates. Maximal degree in co-relation 27219. Up to 40869 conditions per place. [2023-08-30 17:54:39,781 INFO L137 encePairwiseOnDemand]: 360/363 looper letters, 0 selfloop transitions, 0 changer transitions 148/148 dead transitions. [2023-08-30 17:54:39,781 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 78 places, 148 transitions, 626 flow [2023-08-30 17:54:39,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-30 17:54:39,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-30 17:54:39,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1329 transitions. [2023-08-30 17:54:39,785 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5230224321133412 [2023-08-30 17:54:39,785 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1329 transitions. [2023-08-30 17:54:39,785 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1329 transitions. [2023-08-30 17:54:39,786 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-30 17:54:39,786 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1329 transitions. [2023-08-30 17:54:39,788 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 189.85714285714286) internal successors, (1329), 7 states have internal predecessors, (1329), 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) [2023-08-30 17:54:39,791 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 363.0) internal successors, (2904), 8 states have internal predecessors, (2904), 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) [2023-08-30 17:54:39,792 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 363.0) internal successors, (2904), 8 states have internal predecessors, (2904), 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) [2023-08-30 17:54:39,792 INFO L175 Difference]: Start difference. First operand has 75 places, 58 transitions, 172 flow. Second operand 7 states and 1329 transitions. [2023-08-30 17:54:39,792 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 78 places, 148 transitions, 626 flow [2023-08-30 17:54:39,993 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 71 places, 148 transitions, 607 flow, removed 3 selfloop flow, removed 7 redundant places. [2023-08-30 17:54:39,994 INFO L231 Difference]: Finished difference. Result has 71 places, 0 transitions, 0 flow [2023-08-30 17:54:39,994 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=363, PETRI_DIFFERENCE_MINUEND_FLOW=139, PETRI_DIFFERENCE_MINUEND_PLACES=65, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=55, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=55, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=0, PETRI_PLACES=71, PETRI_TRANSITIONS=0} [2023-08-30 17:54:39,995 INFO L281 CegarLoopForPetriNet]: 72 programPoint places, -1 predicate places. [2023-08-30 17:54:39,995 INFO L495 AbstractCegarLoop]: Abstraction has has 71 places, 0 transitions, 0 flow [2023-08-30 17:54:39,996 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 172.6153846153846) internal successors, (2244), 13 states have internal predecessors, (2244), 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) [2023-08-30 17:54:39,996 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-08-30 17:54:40,005 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-08-30 17:54:40,201 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,SelfDestructingSolverStorable11 [2023-08-30 17:54:40,201 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1] [2023-08-30 17:54:40,202 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-08-30 17:54:40,203 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 189 places, 213 transitions, 470 flow [2023-08-30 17:54:40,235 INFO L130 PetriNetUnfolder]: 81/551 cut-off events. [2023-08-30 17:54:40,235 INFO L131 PetriNetUnfolder]: For 48/48 co-relation queries the response was YES. [2023-08-30 17:54:40,237 INFO L83 FinitePrefix]: Finished finitePrefix Result has 606 conditions, 551 events. 81/551 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2139 event pairs, 6 based on Foata normal form. 0/465 useless extension candidates. Maximal degree in co-relation 383. Up to 32 conditions per place. [2023-08-30 17:54:40,237 INFO L82 GeneralOperation]: Start removeDead. Operand has 189 places, 213 transitions, 470 flow [2023-08-30 17:54:40,240 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 189 places, 213 transitions, 470 flow [2023-08-30 17:54:40,240 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-30 17:54:40,240 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 189 places, 213 transitions, 470 flow [2023-08-30 17:54:40,240 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 189 places, 213 transitions, 470 flow [2023-08-30 17:54:40,240 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 189 places, 213 transitions, 470 flow [2023-08-30 17:54:40,287 INFO L130 PetriNetUnfolder]: 81/551 cut-off events. [2023-08-30 17:54:40,287 INFO L131 PetriNetUnfolder]: For 48/48 co-relation queries the response was YES. [2023-08-30 17:54:40,292 INFO L83 FinitePrefix]: Finished finitePrefix Result has 606 conditions, 551 events. 81/551 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2139 event pairs, 6 based on Foata normal form. 0/465 useless extension candidates. Maximal degree in co-relation 383. Up to 32 conditions per place. [2023-08-30 17:54:40,303 INFO L119 LiptonReduction]: Number of co-enabled transitions 24960 [2023-08-30 17:54:43,191 INFO L134 LiptonReduction]: Checked pairs total: 58382 [2023-08-30 17:54:43,191 INFO L136 LiptonReduction]: Total number of compositions: 149 [2023-08-30 17:54:43,192 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-30 17:54:43,192 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=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@60e9b8f, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-30 17:54:43,193 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-30 17:54:43,199 INFO L130 PetriNetUnfolder]: 29/132 cut-off events. [2023-08-30 17:54:43,199 INFO L131 PetriNetUnfolder]: For 23/23 co-relation queries the response was YES. [2023-08-30 17:54:43,199 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:54:43,199 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1] [2023-08-30 17:54:43,199 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-30 17:54:43,199 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:54:43,199 INFO L85 PathProgramCache]: Analyzing trace with hash 1110862061, now seen corresponding path program 1 times [2023-08-30 17:54:43,199 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:54:43,199 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1542387776] [2023-08-30 17:54:43,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:54:43,199 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:54:43,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-30 17:54:43,214 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-30 17:54:43,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-30 17:54:43,228 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-30 17:54:43,229 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-30 17:54:43,229 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-30 17:54:43,229 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-08-30 17:54:43,229 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-30 17:54:43,230 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-30 17:54:43,230 WARN L233 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-30 17:54:43,230 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2023-08-30 17:54:43,249 INFO L144 ThreadInstanceAdder]: Constructed 5 joinOtherThreadTransitions. [2023-08-30 17:54:43,251 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 218 places, 247 transitions, 554 flow [2023-08-30 17:54:43,343 INFO L130 PetriNetUnfolder]: 140/871 cut-off events. [2023-08-30 17:54:43,344 INFO L131 PetriNetUnfolder]: For 110/110 co-relation queries the response was YES. [2023-08-30 17:54:43,353 INFO L83 FinitePrefix]: Finished finitePrefix Result has 982 conditions, 871 events. 140/871 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 3823 event pairs, 23 based on Foata normal form. 0/741 useless extension candidates. Maximal degree in co-relation 596. Up to 80 conditions per place. [2023-08-30 17:54:43,353 INFO L82 GeneralOperation]: Start removeDead. Operand has 218 places, 247 transitions, 554 flow [2023-08-30 17:54:43,358 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 218 places, 247 transitions, 554 flow [2023-08-30 17:54:43,359 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-30 17:54:43,359 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 218 places, 247 transitions, 554 flow [2023-08-30 17:54:43,359 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 218 places, 247 transitions, 554 flow [2023-08-30 17:54:43,359 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 218 places, 247 transitions, 554 flow [2023-08-30 17:54:43,427 INFO L130 PetriNetUnfolder]: 140/871 cut-off events. [2023-08-30 17:54:43,427 INFO L131 PetriNetUnfolder]: For 110/110 co-relation queries the response was YES. [2023-08-30 17:54:43,434 INFO L83 FinitePrefix]: Finished finitePrefix Result has 982 conditions, 871 events. 140/871 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 3823 event pairs, 23 based on Foata normal form. 0/741 useless extension candidates. Maximal degree in co-relation 596. Up to 80 conditions per place. [2023-08-30 17:54:43,451 INFO L119 LiptonReduction]: Number of co-enabled transitions 36800 [2023-08-30 17:54:46,025 INFO L134 LiptonReduction]: Checked pairs total: 91298 [2023-08-30 17:54:46,026 INFO L136 LiptonReduction]: Total number of compositions: 169 [2023-08-30 17:54:46,028 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-30 17:54:46,030 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=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@60e9b8f, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-30 17:54:46,030 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-30 17:54:46,031 INFO L130 PetriNetUnfolder]: 0/6 cut-off events. [2023-08-30 17:54:46,031 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-30 17:54:46,031 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:54:46,032 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-30 17:54:46,032 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-30 17:54:46,033 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:54:46,033 INFO L85 PathProgramCache]: Analyzing trace with hash 73304792, now seen corresponding path program 1 times [2023-08-30 17:54:46,033 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:54:46,033 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [347554342] [2023-08-30 17:54:46,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:54:46,034 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:54:46,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:54:46,071 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:54:46,071 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-30 17:54:46,071 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [347554342] [2023-08-30 17:54:46,071 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [347554342] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-30 17:54:46,071 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-30 17:54:46,071 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-30 17:54:46,072 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903597797] [2023-08-30 17:54:46,072 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-30 17:54:46,072 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-30 17:54:46,072 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-30 17:54:46,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-30 17:54:46,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-30 17:54:46,080 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 197 out of 416 [2023-08-30 17:54:46,081 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 86 places, 112 transitions, 284 flow. Second operand has 3 states, 3 states have (on average 198.33333333333334) internal successors, (595), 3 states have internal predecessors, (595), 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) [2023-08-30 17:54:46,081 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-30 17:54:46,081 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 197 of 416 [2023-08-30 17:54:46,082 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand