./Ultimate.py --spec ../../../trunk/examples/svcomp/properties/unreach-call.prp --file ../../../trunk/examples/svcomp/pthread-complex/safestack_relacy.i --full-output --traceabstraction.when.to.check.the.insufficient.erros.location.relative.to.the.other.error.locations BEFORE --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/pthread-complex/safestack_relacy.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 1d61eb304445c3cb39dfadfa4748d680ea5f0f4958f8bc176e8bc3c77c47e674 --traceabstraction.when.to.check.the.insufficient.erros.location.relative.to.the.other.error.locations BEFORE --- Real Ultimate output --- This is Ultimate 0.2.3-?-b8dbc81 [2023-09-01 10:11:14,053 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-09-01 10:11:14,055 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-09-01 10:11:14,101 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-09-01 10:11:14,104 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-09-01 10:11:14,107 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-09-01 10:11:14,108 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-09-01 10:11:14,111 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-09-01 10:11:14,113 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-09-01 10:11:14,117 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-09-01 10:11:14,118 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-09-01 10:11:14,120 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-09-01 10:11:14,120 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-09-01 10:11:14,121 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-09-01 10:11:14,122 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-09-01 10:11:14,123 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-09-01 10:11:14,123 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-09-01 10:11:14,124 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-09-01 10:11:14,125 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-09-01 10:11:14,126 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-09-01 10:11:14,135 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-09-01 10:11:14,136 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-09-01 10:11:14,137 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-09-01 10:11:14,137 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-09-01 10:11:14,147 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-09-01 10:11:14,148 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-09-01 10:11:14,148 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-09-01 10:11:14,150 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-09-01 10:11:14,150 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-09-01 10:11:14,151 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-09-01 10:11:14,151 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-09-01 10:11:14,157 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-09-01 10:11:14,158 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-09-01 10:11:14,159 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-09-01 10:11:14,159 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-09-01 10:11:14,160 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-09-01 10:11:14,160 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-09-01 10:11:14,160 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-09-01 10:11:14,161 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-09-01 10:11:14,161 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-09-01 10:11:14,162 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-09-01 10:11:14,163 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2023-09-01 10:11:14,195 INFO L113 SettingsManager]: Loading preferences was successful [2023-09-01 10:11:14,195 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-09-01 10:11:14,196 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-09-01 10:11:14,197 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-09-01 10:11:14,197 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-09-01 10:11:14,198 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-09-01 10:11:14,198 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-09-01 10:11:14,198 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2023-09-01 10:11:14,198 INFO L138 SettingsManager]: * Use SBE=true [2023-09-01 10:11:14,199 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-09-01 10:11:14,199 INFO L138 SettingsManager]: * sizeof long=4 [2023-09-01 10:11:14,200 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-09-01 10:11:14,200 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-09-01 10:11:14,200 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-09-01 10:11:14,200 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-09-01 10:11:14,200 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-09-01 10:11:14,201 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-09-01 10:11:14,201 INFO L138 SettingsManager]: * sizeof long double=12 [2023-09-01 10:11:14,201 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-09-01 10:11:14,201 INFO L138 SettingsManager]: * Use constant arrays=true [2023-09-01 10:11:14,201 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-09-01 10:11:14,202 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-09-01 10:11:14,202 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-09-01 10:11:14,202 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-09-01 10:11:14,202 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-09-01 10:11:14,202 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-09-01 10:11:14,203 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-09-01 10:11:14,203 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-09-01 10:11:14,203 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2023-09-01 10:11:14,203 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-09-01 10:11:14,203 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-09-01 10:11:14,204 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-09-01 10:11:14,204 INFO L138 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-09-01 10:11:14,204 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-09-01 10:11:14,204 INFO L138 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-09-01 10:11:14,204 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1d61eb304445c3cb39dfadfa4748d680ea5f0f4958f8bc176e8bc3c77c47e674 Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: When to check the insufficient erros location relative to the other error locations -> BEFORE [2023-09-01 10:11:14,504 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-09-01 10:11:14,523 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-09-01 10:11:14,525 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-09-01 10:11:14,526 INFO L271 PluginConnector]: Initializing CDTParser... [2023-09-01 10:11:14,526 INFO L275 PluginConnector]: CDTParser initialized [2023-09-01 10:11:14,527 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/pthread-complex/safestack_relacy.i [2023-09-01 10:11:15,755 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-09-01 10:11:16,109 INFO L351 CDTParser]: Found 1 translation units. [2023-09-01 10:11:16,110 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/pthread-complex/safestack_relacy.i [2023-09-01 10:11:16,131 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/04d936deb/b323996068ad41efa9af017e2b191e12/FLAG417941936 [2023-09-01 10:11:16,150 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/04d936deb/b323996068ad41efa9af017e2b191e12 [2023-09-01 10:11:16,152 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-09-01 10:11:16,153 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2023-09-01 10:11:16,154 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-09-01 10:11:16,154 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-09-01 10:11:16,157 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-09-01 10:11:16,158 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.09 10:11:16" (1/1) ... [2023-09-01 10:11:16,159 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@24a81530 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 10:11:16, skipping insertion in model container [2023-09-01 10:11:16,159 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.09 10:11:16" (1/1) ... [2023-09-01 10:11:16,164 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-09-01 10:11:16,230 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-09-01 10:11:16,709 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/pthread-complex/safestack_relacy.i[78860,78873] [2023-09-01 10:11:16,719 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-09-01 10:11:16,731 INFO L203 MainTranslator]: Completed pre-run [2023-09-01 10:11:16,780 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/pthread-complex/safestack_relacy.i[78860,78873] [2023-09-01 10:11:16,783 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-09-01 10:11:16,882 WARN L667 CHandler]: The function __VERIFIER_atomic_begin is called, but not defined or handled by StandardFunctionHandler. [2023-09-01 10:11:16,883 WARN L667 CHandler]: The function __VERIFIER_atomic_end is called, but not defined or handled by StandardFunctionHandler. [2023-09-01 10:11:16,888 INFO L208 MainTranslator]: Completed translation [2023-09-01 10:11:16,888 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 10:11:16 WrapperNode [2023-09-01 10:11:16,889 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-09-01 10:11:16,889 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-09-01 10:11:16,890 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-09-01 10:11:16,890 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2023-09-01 10:11:16,895 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 10:11:16" (1/1) ... [2023-09-01 10:11:16,926 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 10:11:16" (1/1) ... [2023-09-01 10:11:16,959 INFO L138 Inliner]: procedures = 481, calls = 74, calls flagged for inlining = 19, calls inlined = 19, statements flattened = 283 [2023-09-01 10:11:16,959 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-09-01 10:11:16,960 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-09-01 10:11:16,960 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-09-01 10:11:16,960 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-09-01 10:11:16,968 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 10:11:16" (1/1) ... [2023-09-01 10:11:16,968 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 10:11:16" (1/1) ... [2023-09-01 10:11:16,974 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 10:11:16" (1/1) ... [2023-09-01 10:11:16,977 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 10:11:16" (1/1) ... [2023-09-01 10:11:16,991 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 10:11:16" (1/1) ... [2023-09-01 10:11:16,994 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 10:11:16" (1/1) ... [2023-09-01 10:11:16,998 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 10:11:16" (1/1) ... [2023-09-01 10:11:17,001 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 10:11:16" (1/1) ... [2023-09-01 10:11:17,006 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-09-01 10:11:17,007 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-09-01 10:11:17,007 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-09-01 10:11:17,007 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-09-01 10:11:17,008 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 10:11:16" (1/1) ... [2023-09-01 10:11:17,013 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-09-01 10:11:17,026 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-09-01 10:11:17,036 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) [2023-09-01 10:11:17,039 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 [2023-09-01 10:11:17,066 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2023-09-01 10:11:17,067 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-09-01 10:11:17,067 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2023-09-01 10:11:17,067 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-09-01 10:11:17,067 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-09-01 10:11:17,067 INFO L130 BoogieDeclarations]: Found specification of procedure thread [2023-09-01 10:11:17,067 INFO L138 BoogieDeclarations]: Found implementation of procedure thread [2023-09-01 10:11:17,067 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-09-01 10:11:17,067 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-09-01 10:11:17,067 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-09-01 10:11:17,067 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-09-01 10:11:17,067 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-09-01 10:11:17,068 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-09-01 10:11:17,394 INFO L236 CfgBuilder]: Building ICFG [2023-09-01 10:11:17,396 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-09-01 10:11:17,799 INFO L277 CfgBuilder]: Performing block encoding [2023-09-01 10:11:17,864 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-09-01 10:11:17,864 INFO L302 CfgBuilder]: Removed 7 assume(true) statements. [2023-09-01 10:11:17,868 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.09 10:11:17 BoogieIcfgContainer [2023-09-01 10:11:17,868 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-09-01 10:11:17,870 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-09-01 10:11:17,870 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-09-01 10:11:17,873 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-09-01 10:11:17,873 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.09 10:11:16" (1/3) ... [2023-09-01 10:11:17,874 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62b44f74 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.09 10:11:17, skipping insertion in model container [2023-09-01 10:11:17,874 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 10:11:16" (2/3) ... [2023-09-01 10:11:17,875 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62b44f74 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.09 10:11:17, skipping insertion in model container [2023-09-01 10:11:17,875 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.09 10:11:17" (3/3) ... [2023-09-01 10:11:17,876 INFO L112 eAbstractionObserver]: Analyzing ICFG safestack_relacy.i [2023-09-01 10:11:17,884 WARN L145 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2023-09-01 10:11:17,892 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-09-01 10:11:17,892 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-09-01 10:11:17,892 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-09-01 10:11:17,999 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-09-01 10:11:18,035 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 234 places, 248 transitions, 504 flow [2023-09-01 10:11:18,126 INFO L130 PetriNetUnfolder]: 19/262 cut-off events. [2023-09-01 10:11:18,126 INFO L131 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2023-09-01 10:11:18,132 INFO L83 FinitePrefix]: Finished finitePrefix Result has 268 conditions, 262 events. 19/262 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 413 event pairs, 0 based on Foata normal form. 0/239 useless extension candidates. Maximal degree in co-relation 182. Up to 4 conditions per place. [2023-09-01 10:11:18,132 INFO L82 GeneralOperation]: Start removeDead. Operand has 234 places, 248 transitions, 504 flow [2023-09-01 10:11:18,137 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 230 places, 243 transitions, 491 flow [2023-09-01 10:11:18,140 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-09-01 10:11:18,156 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 230 places, 243 transitions, 491 flow [2023-09-01 10:11:18,158 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 230 places, 243 transitions, 491 flow [2023-09-01 10:11:18,159 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 230 places, 243 transitions, 491 flow [2023-09-01 10:11:18,239 INFO L130 PetriNetUnfolder]: 18/257 cut-off events. [2023-09-01 10:11:18,239 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-09-01 10:11:18,253 INFO L83 FinitePrefix]: Finished finitePrefix Result has 262 conditions, 257 events. 18/257 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 373 event pairs, 0 based on Foata normal form. 0/234 useless extension candidates. Maximal degree in co-relation 182. Up to 4 conditions per place. [2023-09-01 10:11:18,257 INFO L119 LiptonReduction]: Number of co-enabled transitions 6520 [2023-09-01 10:11:24,780 INFO L134 LiptonReduction]: Checked pairs total: 6702 [2023-09-01 10:11:24,780 INFO L136 LiptonReduction]: Total number of compositions: 242 [2023-09-01 10:11:24,792 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-09-01 10:11:24,798 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;@1679d7d1, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-09-01 10:11:24,798 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-09-01 10:11:24,802 INFO L130 PetriNetUnfolder]: 1/14 cut-off events. [2023-09-01 10:11:24,802 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-09-01 10:11:24,802 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 10:11:24,803 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1] [2023-09-01 10:11:24,803 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 10:11:24,807 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 10:11:24,807 INFO L85 PathProgramCache]: Analyzing trace with hash -775278274, now seen corresponding path program 1 times [2023-09-01 10:11:24,815 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 10:11:24,815 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1705432044] [2023-09-01 10:11:24,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 10:11:24,816 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 10:11:24,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 10:11:25,221 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-09-01 10:11:25,222 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 10:11:25,222 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1705432044] [2023-09-01 10:11:25,222 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1705432044] provided 1 perfect and 0 imperfect interpolant sequences [2023-09-01 10:11:25,223 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-09-01 10:11:25,223 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-09-01 10:11:25,224 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227134534] [2023-09-01 10:11:25,224 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-09-01 10:11:25,231 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-09-01 10:11:25,236 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 10:11:25,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-09-01 10:11:25,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-09-01 10:11:25,284 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 225 out of 490 [2023-09-01 10:11:25,290 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 30 places, 37 transitions, 79 flow. Second operand has 3 states, 3 states have (on average 226.66666666666666) internal successors, (680), 3 states have internal predecessors, (680), 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) [2023-09-01 10:11:25,290 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 10:11:25,290 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 225 of 490 [2023-09-01 10:11:25,291 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 10:11:25,394 INFO L130 PetriNetUnfolder]: 82/169 cut-off events. [2023-09-01 10:11:25,394 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-09-01 10:11:25,396 INFO L83 FinitePrefix]: Finished finitePrefix Result has 343 conditions, 169 events. 82/169 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 470 event pairs, 57 based on Foata normal form. 0/119 useless extension candidates. Maximal degree in co-relation 320. Up to 167 conditions per place. [2023-09-01 10:11:25,398 INFO L137 encePairwiseOnDemand]: 483/490 looper letters, 30 selfloop transitions, 2 changer transitions 1/34 dead transitions. [2023-09-01 10:11:25,399 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 31 places, 34 transitions, 139 flow [2023-09-01 10:11:25,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-09-01 10:11:25,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-09-01 10:11:25,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 713 transitions. [2023-09-01 10:11:25,418 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4850340136054422 [2023-09-01 10:11:25,419 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 713 transitions. [2023-09-01 10:11:25,419 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 713 transitions. [2023-09-01 10:11:25,423 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 10:11:25,425 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 713 transitions. [2023-09-01 10:11:25,430 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 237.66666666666666) internal successors, (713), 3 states have internal predecessors, (713), 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) [2023-09-01 10:11:25,436 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 490.0) internal successors, (1960), 4 states have internal predecessors, (1960), 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) [2023-09-01 10:11:25,438 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 490.0) internal successors, (1960), 4 states have internal predecessors, (1960), 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) [2023-09-01 10:11:25,439 INFO L175 Difference]: Start difference. First operand has 30 places, 37 transitions, 79 flow. Second operand 3 states and 713 transitions. [2023-09-01 10:11:25,440 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 31 places, 34 transitions, 139 flow [2023-09-01 10:11:25,442 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 31 places, 34 transitions, 139 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-09-01 10:11:25,444 INFO L231 Difference]: Finished difference. Result has 32 places, 33 transitions, 81 flow [2023-09-01 10:11:25,446 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=490, PETRI_DIFFERENCE_MINUEND_FLOW=71, PETRI_DIFFERENCE_MINUEND_PLACES=29, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=33, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=31, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=81, PETRI_PLACES=32, PETRI_TRANSITIONS=33} [2023-09-01 10:11:25,450 INFO L281 CegarLoopForPetriNet]: 30 programPoint places, 2 predicate places. [2023-09-01 10:11:25,450 INFO L495 AbstractCegarLoop]: Abstraction has has 32 places, 33 transitions, 81 flow [2023-09-01 10:11:25,451 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 226.66666666666666) internal successors, (680), 3 states have internal predecessors, (680), 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) [2023-09-01 10:11:25,451 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 10:11:25,451 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2023-09-01 10:11:25,451 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-09-01 10:11:25,452 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 10:11:25,453 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 10:11:25,455 INFO L85 PathProgramCache]: Analyzing trace with hash -1198421338, now seen corresponding path program 1 times [2023-09-01 10:11:25,455 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 10:11:25,456 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [704644595] [2023-09-01 10:11:25,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 10:11:25,456 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 10:11:25,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 10:11:25,613 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-09-01 10:11:25,614 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 10:11:25,614 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [704644595] [2023-09-01 10:11:25,614 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [704644595] provided 0 perfect and 1 imperfect interpolant sequences [2023-09-01 10:11:25,618 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1937806996] [2023-09-01 10:11:25,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 10:11:25,619 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-09-01 10:11:25,619 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-09-01 10:11:25,625 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) [2023-09-01 10:11:25,668 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-09-01 10:11:25,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 10:11:25,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 5 conjunts are in the unsatisfiable core [2023-09-01 10:11:25,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-09-01 10:11:25,898 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-09-01 10:11:25,898 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-09-01 10:11:25,929 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-09-01 10:11:25,930 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1937806996] provided 0 perfect and 2 imperfect interpolant sequences [2023-09-01 10:11:25,930 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-09-01 10:11:25,930 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 7 [2023-09-01 10:11:25,931 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487360876] [2023-09-01 10:11:25,931 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-09-01 10:11:25,931 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-09-01 10:11:25,932 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 10:11:25,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-09-01 10:11:25,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2023-09-01 10:11:25,965 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 223 out of 490 [2023-09-01 10:11:25,967 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 32 places, 33 transitions, 81 flow. Second operand has 8 states, 8 states have (on average 224.5) internal successors, (1796), 8 states have internal predecessors, (1796), 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) [2023-09-01 10:11:25,967 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 10:11:25,967 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 223 of 490 [2023-09-01 10:11:25,968 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 10:11:26,081 INFO L130 PetriNetUnfolder]: 57/124 cut-off events. [2023-09-01 10:11:26,082 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-09-01 10:11:26,082 INFO L83 FinitePrefix]: Finished finitePrefix Result has 261 conditions, 124 events. 57/124 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 300 event pairs, 38 based on Foata normal form. 0/102 useless extension candidates. Maximal degree in co-relation 249. Up to 121 conditions per place. [2023-09-01 10:11:26,083 INFO L137 encePairwiseOnDemand]: 487/490 looper letters, 30 selfloop transitions, 3 changer transitions 0/34 dead transitions. [2023-09-01 10:11:26,083 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 34 places, 34 transitions, 151 flow [2023-09-01 10:11:26,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-09-01 10:11:26,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-09-01 10:11:26,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 926 transitions. [2023-09-01 10:11:26,086 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.47244897959183674 [2023-09-01 10:11:26,086 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 926 transitions. [2023-09-01 10:11:26,086 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 926 transitions. [2023-09-01 10:11:26,086 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 10:11:26,087 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 926 transitions. [2023-09-01 10:11:26,089 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 231.5) internal successors, (926), 4 states have internal predecessors, (926), 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) [2023-09-01 10:11:26,092 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 490.0) internal successors, (2450), 5 states have internal predecessors, (2450), 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) [2023-09-01 10:11:26,093 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 490.0) internal successors, (2450), 5 states have internal predecessors, (2450), 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) [2023-09-01 10:11:26,093 INFO L175 Difference]: Start difference. First operand has 32 places, 33 transitions, 81 flow. Second operand 4 states and 926 transitions. [2023-09-01 10:11:26,093 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 34 places, 34 transitions, 151 flow [2023-09-01 10:11:26,094 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 33 places, 34 transitions, 147 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-09-01 10:11:26,095 INFO L231 Difference]: Finished difference. Result has 34 places, 34 transitions, 93 flow [2023-09-01 10:11:26,095 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=490, PETRI_DIFFERENCE_MINUEND_FLOW=77, PETRI_DIFFERENCE_MINUEND_PLACES=30, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=33, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=30, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=93, PETRI_PLACES=34, PETRI_TRANSITIONS=34} [2023-09-01 10:11:26,096 INFO L281 CegarLoopForPetriNet]: 30 programPoint places, 4 predicate places. [2023-09-01 10:11:26,096 INFO L495 AbstractCegarLoop]: Abstraction has has 34 places, 34 transitions, 93 flow [2023-09-01 10:11:26,097 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 224.5) internal successors, (1796), 8 states have internal predecessors, (1796), 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) [2023-09-01 10:11:26,097 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 10:11:26,097 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 1, 1, 1, 1, 1] [2023-09-01 10:11:26,107 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-09-01 10:11:26,304 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 [2023-09-01 10:11:26,304 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 10:11:26,305 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 10:11:26,305 INFO L85 PathProgramCache]: Analyzing trace with hash -1430954434, now seen corresponding path program 2 times [2023-09-01 10:11:26,305 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 10:11:26,305 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657131932] [2023-09-01 10:11:26,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 10:11:26,306 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 10:11:26,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-09-01 10:11:26,333 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-09-01 10:11:26,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-09-01 10:11:26,370 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-09-01 10:11:26,370 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-09-01 10:11:26,371 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-09-01 10:11:26,372 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-09-01 10:11:26,373 INFO L445 BasicCegarLoop]: Path program histogram: [2, 1] [2023-09-01 10:11:26,374 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (1/2) [2023-09-01 10:11:26,375 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-09-01 10:11:26,375 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-09-01 10:11:26,433 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-09-01 10:11:26,437 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 388 places, 413 transitions, 844 flow [2023-09-01 10:11:26,517 INFO L130 PetriNetUnfolder]: 36/463 cut-off events. [2023-09-01 10:11:26,517 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-09-01 10:11:26,524 INFO L83 FinitePrefix]: Finished finitePrefix Result has 477 conditions, 463 events. 36/463 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 1452 event pairs, 0 based on Foata normal form. 0/421 useless extension candidates. Maximal degree in co-relation 358. Up to 8 conditions per place. [2023-09-01 10:11:26,524 INFO L82 GeneralOperation]: Start removeDead. Operand has 388 places, 413 transitions, 844 flow [2023-09-01 10:11:26,528 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 388 places, 413 transitions, 844 flow [2023-09-01 10:11:26,528 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-09-01 10:11:26,528 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 388 places, 413 transitions, 844 flow [2023-09-01 10:11:26,529 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 388 places, 413 transitions, 844 flow [2023-09-01 10:11:26,529 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 388 places, 413 transitions, 844 flow [2023-09-01 10:11:26,608 INFO L130 PetriNetUnfolder]: 36/463 cut-off events. [2023-09-01 10:11:26,608 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-09-01 10:11:26,613 INFO L83 FinitePrefix]: Finished finitePrefix Result has 477 conditions, 463 events. 36/463 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 1452 event pairs, 0 based on Foata normal form. 0/421 useless extension candidates. Maximal degree in co-relation 358. Up to 8 conditions per place. [2023-09-01 10:11:26,641 INFO L119 LiptonReduction]: Number of co-enabled transitions 69764 [2023-09-01 10:11:35,361 INFO L134 LiptonReduction]: Checked pairs total: 82796 [2023-09-01 10:11:35,362 INFO L136 LiptonReduction]: Total number of compositions: 396 [2023-09-01 10:11:35,364 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-09-01 10:11:35,365 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;@1679d7d1, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-09-01 10:11:35,365 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-09-01 10:11:35,370 INFO L130 PetriNetUnfolder]: 5/47 cut-off events. [2023-09-01 10:11:35,370 INFO L131 PetriNetUnfolder]: For 5/5 co-relation queries the response was YES. [2023-09-01 10:11:35,370 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 10:11:35,371 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1] [2023-09-01 10:11:35,371 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 10:11:35,371 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 10:11:35,371 INFO L85 PathProgramCache]: Analyzing trace with hash 1270343773, now seen corresponding path program 1 times [2023-09-01 10:11:35,371 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 10:11:35,372 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1863218543] [2023-09-01 10:11:35,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 10:11:35,372 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 10:11:35,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 10:11:35,454 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-09-01 10:11:35,455 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 10:11:35,455 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1863218543] [2023-09-01 10:11:35,458 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1863218543] provided 1 perfect and 0 imperfect interpolant sequences [2023-09-01 10:11:35,459 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-09-01 10:11:35,459 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-09-01 10:11:35,459 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103777173] [2023-09-01 10:11:35,460 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-09-01 10:11:35,460 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-09-01 10:11:35,461 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 10:11:35,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-09-01 10:11:35,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-09-01 10:11:35,481 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 375 out of 809 [2023-09-01 10:11:35,485 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 66 places, 81 transitions, 180 flow. Second operand has 3 states, 3 states have (on average 377.0) internal successors, (1131), 3 states have internal predecessors, (1131), 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) [2023-09-01 10:11:35,485 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 10:11:35,485 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 375 of 809 [2023-09-01 10:11:35,485 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 10:11:36,727 INFO L130 PetriNetUnfolder]: 8425/12461 cut-off events. [2023-09-01 10:11:36,728 INFO L131 PetriNetUnfolder]: For 207/207 co-relation queries the response was YES. [2023-09-01 10:11:36,738 INFO L83 FinitePrefix]: Finished finitePrefix Result has 24907 conditions, 12461 events. 8425/12461 cut-off events. For 207/207 co-relation queries the response was YES. Maximal size of possible extension queue 348. Compared 68317 event pairs, 6567 based on Foata normal form. 0/9028 useless extension candidates. Maximal degree in co-relation 20102. Up to 12304 conditions per place. [2023-09-01 10:11:36,801 INFO L137 encePairwiseOnDemand]: 801/809 looper letters, 65 selfloop transitions, 2 changer transitions 7/77 dead transitions. [2023-09-01 10:11:36,801 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 68 places, 77 transitions, 318 flow [2023-09-01 10:11:36,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-09-01 10:11:36,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-09-01 10:11:36,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 1204 transitions. [2023-09-01 10:11:36,806 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.496085702513391 [2023-09-01 10:11:36,806 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 1204 transitions. [2023-09-01 10:11:36,806 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 1204 transitions. [2023-09-01 10:11:36,806 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 10:11:36,807 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 1204 transitions. [2023-09-01 10:11:36,809 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 401.3333333333333) internal successors, (1204), 3 states have internal predecessors, (1204), 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) [2023-09-01 10:11:36,813 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 809.0) internal successors, (3236), 4 states have internal predecessors, (3236), 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) [2023-09-01 10:11:36,814 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 809.0) internal successors, (3236), 4 states have internal predecessors, (3236), 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) [2023-09-01 10:11:36,815 INFO L175 Difference]: Start difference. First operand has 66 places, 81 transitions, 180 flow. Second operand 3 states and 1204 transitions. [2023-09-01 10:11:36,815 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 68 places, 77 transitions, 318 flow [2023-09-01 10:11:36,818 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 68 places, 77 transitions, 318 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-09-01 10:11:36,820 INFO L231 Difference]: Finished difference. Result has 69 places, 70 transitions, 162 flow [2023-09-01 10:11:36,821 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=809, PETRI_DIFFERENCE_MINUEND_FLOW=170, PETRI_DIFFERENCE_MINUEND_PLACES=66, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=76, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=74, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=162, PETRI_PLACES=69, PETRI_TRANSITIONS=70} [2023-09-01 10:11:36,823 INFO L281 CegarLoopForPetriNet]: 66 programPoint places, 3 predicate places. [2023-09-01 10:11:36,823 INFO L495 AbstractCegarLoop]: Abstraction has has 69 places, 70 transitions, 162 flow [2023-09-01 10:11:36,823 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 377.0) internal successors, (1131), 3 states have internal predecessors, (1131), 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) [2023-09-01 10:11:36,824 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 10:11:36,824 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2023-09-01 10:11:36,824 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-09-01 10:11:36,824 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 10:11:36,824 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 10:11:36,825 INFO L85 PathProgramCache]: Analyzing trace with hash -190819178, now seen corresponding path program 1 times [2023-09-01 10:11:36,825 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 10:11:36,825 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [440305087] [2023-09-01 10:11:36,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 10:11:36,825 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 10:11:36,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 10:11:36,944 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-09-01 10:11:36,945 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 10:11:36,945 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [440305087] [2023-09-01 10:11:36,945 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [440305087] provided 0 perfect and 1 imperfect interpolant sequences [2023-09-01 10:11:36,945 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [855815832] [2023-09-01 10:11:36,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 10:11:36,945 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-09-01 10:11:36,946 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-09-01 10:11:36,949 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) [2023-09-01 10:11:36,972 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-09-01 10:11:37,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 10:11:37,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 5 conjunts are in the unsatisfiable core [2023-09-01 10:11:37,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-09-01 10:11:37,104 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-09-01 10:11:37,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-09-01 10:11:37,120 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-09-01 10:11:37,120 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [855815832] provided 0 perfect and 2 imperfect interpolant sequences [2023-09-01 10:11:37,120 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-09-01 10:11:37,121 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 7 [2023-09-01 10:11:37,121 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347463305] [2023-09-01 10:11:37,121 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-09-01 10:11:37,121 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-09-01 10:11:37,122 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 10:11:37,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-09-01 10:11:37,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2023-09-01 10:11:37,163 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 373 out of 809 [2023-09-01 10:11:37,166 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 69 places, 70 transitions, 162 flow. Second operand has 8 states, 8 states have (on average 374.625) internal successors, (2997), 8 states have internal predecessors, (2997), 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) [2023-09-01 10:11:37,166 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 10:11:37,166 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 373 of 809 [2023-09-01 10:11:37,166 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 10:11:37,905 INFO L130 PetriNetUnfolder]: 3827/5775 cut-off events. [2023-09-01 10:11:37,905 INFO L131 PetriNetUnfolder]: For 78/78 co-relation queries the response was YES. [2023-09-01 10:11:37,909 INFO L83 FinitePrefix]: Finished finitePrefix Result has 11581 conditions, 5775 events. 3827/5775 cut-off events. For 78/78 co-relation queries the response was YES. Maximal size of possible extension queue 190. Compared 29632 event pairs, 2926 based on Foata normal form. 0/4714 useless extension candidates. Maximal degree in co-relation 11568. Up to 5706 conditions per place. [2023-09-01 10:11:37,933 INFO L137 encePairwiseOnDemand]: 806/809 looper letters, 65 selfloop transitions, 3 changer transitions 0/71 dead transitions. [2023-09-01 10:11:37,933 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 67 places, 71 transitions, 302 flow [2023-09-01 10:11:37,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-09-01 10:11:37,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-09-01 10:11:37,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 1561 transitions. [2023-09-01 10:11:37,939 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.48238566131025956 [2023-09-01 10:11:37,939 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 1561 transitions. [2023-09-01 10:11:37,939 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 1561 transitions. [2023-09-01 10:11:37,940 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 10:11:37,940 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 1561 transitions. [2023-09-01 10:11:37,943 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 390.25) internal successors, (1561), 4 states have internal predecessors, (1561), 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) [2023-09-01 10:11:37,948 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 809.0) internal successors, (4045), 5 states have internal predecessors, (4045), 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) [2023-09-01 10:11:37,950 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 809.0) internal successors, (4045), 5 states have internal predecessors, (4045), 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) [2023-09-01 10:11:37,950 INFO L175 Difference]: Start difference. First operand has 69 places, 70 transitions, 162 flow. Second operand 4 states and 1561 transitions. [2023-09-01 10:11:37,950 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 67 places, 71 transitions, 302 flow [2023-09-01 10:11:37,951 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 66 places, 71 transitions, 296 flow, removed 2 selfloop flow, removed 1 redundant places. [2023-09-01 10:11:37,953 INFO L231 Difference]: Finished difference. Result has 67 places, 71 transitions, 172 flow [2023-09-01 10:11:37,953 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=809, PETRI_DIFFERENCE_MINUEND_FLOW=156, PETRI_DIFFERENCE_MINUEND_PLACES=63, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=70, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=67, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=172, PETRI_PLACES=67, PETRI_TRANSITIONS=71} [2023-09-01 10:11:37,955 INFO L281 CegarLoopForPetriNet]: 66 programPoint places, 1 predicate places. [2023-09-01 10:11:37,955 INFO L495 AbstractCegarLoop]: Abstraction has has 67 places, 71 transitions, 172 flow [2023-09-01 10:11:37,957 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 374.625) internal successors, (2997), 8 states have internal predecessors, (2997), 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) [2023-09-01 10:11:37,957 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 10:11:37,957 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1] [2023-09-01 10:11:37,967 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-09-01 10:11:38,163 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 [2023-09-01 10:11:38,163 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 10:11:38,164 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 10:11:38,164 INFO L85 PathProgramCache]: Analyzing trace with hash 1757769597, now seen corresponding path program 2 times [2023-09-01 10:11:38,164 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 10:11:38,164 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [851361174] [2023-09-01 10:11:38,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 10:11:38,164 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 10:11:38,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-09-01 10:11:38,216 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-09-01 10:11:38,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-09-01 10:11:38,258 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-09-01 10:11:38,259 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-09-01 10:11:38,259 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-09-01 10:11:38,259 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-09-01 10:11:38,260 INFO L445 BasicCegarLoop]: Path program histogram: [2, 1] [2023-09-01 10:11:38,260 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (1/2) [2023-09-01 10:11:38,260 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-09-01 10:11:38,260 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-09-01 10:11:38,326 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-09-01 10:11:38,332 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 542 places, 578 transitions, 1186 flow [2023-09-01 10:11:38,462 INFO L130 PetriNetUnfolder]: 58/691 cut-off events. [2023-09-01 10:11:38,463 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-09-01 10:11:38,475 INFO L83 FinitePrefix]: Finished finitePrefix Result has 719 conditions, 691 events. 58/691 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 16. Compared 2904 event pairs, 1 based on Foata normal form. 0/626 useless extension candidates. Maximal degree in co-relation 549. Up to 16 conditions per place. [2023-09-01 10:11:38,476 INFO L82 GeneralOperation]: Start removeDead. Operand has 542 places, 578 transitions, 1186 flow [2023-09-01 10:11:38,489 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 542 places, 578 transitions, 1186 flow [2023-09-01 10:11:38,490 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-09-01 10:11:38,490 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 542 places, 578 transitions, 1186 flow [2023-09-01 10:11:38,491 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 542 places, 578 transitions, 1186 flow [2023-09-01 10:11:38,491 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 542 places, 578 transitions, 1186 flow [2023-09-01 10:11:38,622 INFO L130 PetriNetUnfolder]: 58/691 cut-off events. [2023-09-01 10:11:38,622 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-09-01 10:11:38,635 INFO L83 FinitePrefix]: Finished finitePrefix Result has 719 conditions, 691 events. 58/691 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 16. Compared 2904 event pairs, 1 based on Foata normal form. 0/626 useless extension candidates. Maximal degree in co-relation 549. Up to 16 conditions per place. [2023-09-01 10:11:38,690 INFO L119 LiptonReduction]: Number of co-enabled transitions 185820 [2023-09-01 10:11:49,664 INFO L134 LiptonReduction]: Checked pairs total: 211500 [2023-09-01 10:11:49,664 INFO L136 LiptonReduction]: Total number of compositions: 551 [2023-09-01 10:11:49,669 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-09-01 10:11:49,672 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;@1679d7d1, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-09-01 10:11:49,673 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-09-01 10:11:49,684 INFO L130 PetriNetUnfolder]: 17/96 cut-off events. [2023-09-01 10:11:49,684 INFO L131 PetriNetUnfolder]: For 13/13 co-relation queries the response was YES. [2023-09-01 10:11:49,684 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 10:11:49,685 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1] [2023-09-01 10:11:49,685 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 10:11:49,685 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 10:11:49,685 INFO L85 PathProgramCache]: Analyzing trace with hash 698955491, now seen corresponding path program 1 times [2023-09-01 10:11:49,685 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 10:11:49,687 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1849364290] [2023-09-01 10:11:49,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 10:11:49,687 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 10:11:49,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 10:11:49,770 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-09-01 10:11:49,771 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 10:11:49,771 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1849364290] [2023-09-01 10:11:49,771 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1849364290] provided 1 perfect and 0 imperfect interpolant sequences [2023-09-01 10:11:49,771 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-09-01 10:11:49,771 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-09-01 10:11:49,772 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094663188] [2023-09-01 10:11:49,772 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-09-01 10:11:49,772 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-09-01 10:11:49,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 10:11:49,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-09-01 10:11:49,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-09-01 10:11:49,791 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 525 out of 1129 [2023-09-01 10:11:49,793 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 92 places, 116 transitions, 262 flow. Second operand has 3 states, 3 states have (on average 527.3333333333334) internal successors, (1582), 3 states have internal predecessors, (1582), 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) [2023-09-01 10:11:49,793 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 10:11:49,794 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 525 of 1129 [2023-09-01 10:11:49,794 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 10:12:19,255 INFO L130 PetriNetUnfolder]: 332985/433383 cut-off events. [2023-09-01 10:12:19,255 INFO L131 PetriNetUnfolder]: For 9466/9466 co-relation queries the response was YES. [2023-09-01 10:12:19,647 INFO L83 FinitePrefix]: Finished finitePrefix Result has 870690 conditions, 433383 events. 332985/433383 cut-off events. For 9466/9466 co-relation queries the response was YES. Maximal size of possible extension queue 7295. Compared 2708991 event pairs, 262039 based on Foata normal form. 0/318877 useless extension candidates. Maximal degree in co-relation 188798. Up to 432539 conditions per place. [2023-09-01 10:12:20,444 INFO L137 encePairwiseOnDemand]: 1117/1129 looper letters, 96 selfloop transitions, 2 changer transitions 8/108 dead transitions. [2023-09-01 10:12:20,444 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 94 places, 108 transitions, 456 flow [2023-09-01 10:12:20,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-09-01 10:12:20,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-09-01 10:12:20,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 1690 transitions. [2023-09-01 10:12:20,448 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.49896663714201356 [2023-09-01 10:12:20,448 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 1690 transitions. [2023-09-01 10:12:20,448 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 1690 transitions. [2023-09-01 10:12:20,449 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 10:12:20,449 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 1690 transitions. [2023-09-01 10:12:20,453 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 563.3333333333334) internal successors, (1690), 3 states have internal predecessors, (1690), 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) [2023-09-01 10:12:20,645 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 1129.0) internal successors, (4516), 4 states have internal predecessors, (4516), 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) [2023-09-01 10:12:20,646 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 1129.0) internal successors, (4516), 4 states have internal predecessors, (4516), 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) [2023-09-01 10:12:20,646 INFO L175 Difference]: Start difference. First operand has 92 places, 116 transitions, 262 flow. Second operand 3 states and 1690 transitions. [2023-09-01 10:12:20,646 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 94 places, 108 transitions, 456 flow [2023-09-01 10:12:20,658 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 94 places, 108 transitions, 456 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-09-01 10:12:20,666 INFO L231 Difference]: Finished difference. Result has 95 places, 100 transitions, 231 flow [2023-09-01 10:12:20,666 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1129, PETRI_DIFFERENCE_MINUEND_FLOW=244, PETRI_DIFFERENCE_MINUEND_PLACES=92, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=107, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=105, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=231, PETRI_PLACES=95, PETRI_TRANSITIONS=100} [2023-09-01 10:12:20,667 INFO L281 CegarLoopForPetriNet]: 92 programPoint places, 3 predicate places. [2023-09-01 10:12:20,667 INFO L495 AbstractCegarLoop]: Abstraction has has 95 places, 100 transitions, 231 flow [2023-09-01 10:12:20,668 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 527.3333333333334) internal successors, (1582), 3 states have internal predecessors, (1582), 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) [2023-09-01 10:12:20,668 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 10:12:20,668 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-09-01 10:12:20,668 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-09-01 10:12:20,668 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 10:12:20,669 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 10:12:20,669 INFO L85 PathProgramCache]: Analyzing trace with hash 1296553055, now seen corresponding path program 1 times [2023-09-01 10:12:20,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 10:12:20,669 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [379143099] [2023-09-01 10:12:20,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 10:12:20,669 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 10:12:20,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 10:12:20,762 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-09-01 10:12:20,763 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 10:12:20,763 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [379143099] [2023-09-01 10:12:20,763 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [379143099] provided 0 perfect and 1 imperfect interpolant sequences [2023-09-01 10:12:20,763 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1862125267] [2023-09-01 10:12:20,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 10:12:20,764 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-09-01 10:12:20,764 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-09-01 10:12:20,765 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) [2023-09-01 10:12:20,769 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-09-01 10:12:20,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 10:12:20,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 5 conjunts are in the unsatisfiable core [2023-09-01 10:12:20,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-09-01 10:12:20,941 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-09-01 10:12:20,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-09-01 10:12:20,955 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-09-01 10:12:20,955 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1862125267] provided 0 perfect and 2 imperfect interpolant sequences [2023-09-01 10:12:20,956 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-09-01 10:12:20,956 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-09-01 10:12:20,956 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917325651] [2023-09-01 10:12:20,956 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-09-01 10:12:20,956 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-09-01 10:12:20,956 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 10:12:20,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-09-01 10:12:20,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2023-09-01 10:12:20,988 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 523 out of 1129 [2023-09-01 10:12:20,999 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 95 places, 100 transitions, 231 flow. Second operand has 7 states, 7 states have (on average 524.8571428571429) internal successors, (3674), 7 states have internal predecessors, (3674), 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) [2023-09-01 10:12:20,999 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 10:12:20,999 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 523 of 1129 [2023-09-01 10:12:20,999 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 10:12:33,542 INFO L130 PetriNetUnfolder]: 151967/199068 cut-off events. [2023-09-01 10:12:33,542 INFO L131 PetriNetUnfolder]: For 4018/4018 co-relation queries the response was YES. [2023-09-01 10:12:33,776 INFO L83 FinitePrefix]: Finished finitePrefix Result has 400790 conditions, 199068 events. 151967/199068 cut-off events. For 4018/4018 co-relation queries the response was YES. Maximal size of possible extension queue 3866. Compared 1191619 event pairs, 118198 based on Foata normal form. 0/159670 useless extension candidates. Maximal degree in co-relation 400776. Up to 198921 conditions per place. [2023-09-01 10:12:34,259 INFO L137 encePairwiseOnDemand]: 1126/1129 looper letters, 96 selfloop transitions, 3 changer transitions 0/101 dead transitions. [2023-09-01 10:12:34,260 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 93 places, 101 transitions, 433 flow [2023-09-01 10:12:34,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-09-01 10:12:34,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-09-01 10:12:34,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 2192 transitions. [2023-09-01 10:12:34,265 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4853852967227635 [2023-09-01 10:12:34,265 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 2192 transitions. [2023-09-01 10:12:34,265 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 2192 transitions. [2023-09-01 10:12:34,267 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 10:12:34,267 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 2192 transitions. [2023-09-01 10:12:34,271 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 548.0) internal successors, (2192), 4 states have internal predecessors, (2192), 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) [2023-09-01 10:12:34,277 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 1129.0) internal successors, (5645), 5 states have internal predecessors, (5645), 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) [2023-09-01 10:12:34,278 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 1129.0) internal successors, (5645), 5 states have internal predecessors, (5645), 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) [2023-09-01 10:12:34,278 INFO L175 Difference]: Start difference. First operand has 95 places, 100 transitions, 231 flow. Second operand 4 states and 2192 transitions. [2023-09-01 10:12:34,278 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 93 places, 101 transitions, 433 flow [2023-09-01 10:12:34,282 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 92 places, 101 transitions, 423 flow, removed 4 selfloop flow, removed 1 redundant places. [2023-09-01 10:12:34,283 INFO L231 Difference]: Finished difference. Result has 93 places, 101 transitions, 237 flow [2023-09-01 10:12:34,283 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1129, PETRI_DIFFERENCE_MINUEND_FLOW=221, PETRI_DIFFERENCE_MINUEND_PLACES=89, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=100, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=97, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=237, PETRI_PLACES=93, PETRI_TRANSITIONS=101} [2023-09-01 10:12:34,284 INFO L281 CegarLoopForPetriNet]: 92 programPoint places, 1 predicate places. [2023-09-01 10:12:34,284 INFO L495 AbstractCegarLoop]: Abstraction has has 93 places, 101 transitions, 237 flow [2023-09-01 10:12:34,286 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 524.8571428571429) internal successors, (3674), 7 states have internal predecessors, (3674), 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) [2023-09-01 10:12:34,286 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 10:12:34,286 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2023-09-01 10:12:34,295 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-09-01 10:12:34,491 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 [2023-09-01 10:12:34,492 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 10:12:34,492 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 10:12:34,492 INFO L85 PathProgramCache]: Analyzing trace with hash -1652758941, now seen corresponding path program 2 times [2023-09-01 10:12:34,492 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 10:12:34,492 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [752777537] [2023-09-01 10:12:34,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 10:12:34,493 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 10:12:34,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 10:12:34,607 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 9 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-09-01 10:12:34,607 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 10:12:34,607 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [752777537] [2023-09-01 10:12:34,607 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [752777537] provided 0 perfect and 1 imperfect interpolant sequences [2023-09-01 10:12:34,607 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [248854947] [2023-09-01 10:12:34,608 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-09-01 10:12:34,608 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-09-01 10:12:34,608 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-09-01 10:12:34,609 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) [2023-09-01 10:12:34,636 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-09-01 10:12:34,780 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-09-01 10:12:34,780 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-09-01 10:12:34,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 5 conjunts are in the unsatisfiable core [2023-09-01 10:12:34,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-09-01 10:12:34,934 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-09-01 10:12:34,934 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-09-01 10:12:34,934 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [248854947] provided 1 perfect and 0 imperfect interpolant sequences [2023-09-01 10:12:34,935 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-09-01 10:12:34,935 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2023-09-01 10:12:34,935 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263089292] [2023-09-01 10:12:34,935 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-09-01 10:12:34,935 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-09-01 10:12:34,935 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 10:12:34,936 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-09-01 10:12:34,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2023-09-01 10:12:34,961 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 520 out of 1129 [2023-09-01 10:12:34,969 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 93 places, 101 transitions, 237 flow. Second operand has 6 states, 6 states have (on average 522.1666666666666) internal successors, (3133), 6 states have internal predecessors, (3133), 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) [2023-09-01 10:12:34,969 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 10:12:34,969 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 520 of 1129 [2023-09-01 10:12:34,969 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 10:12:43,329 INFO L130 PetriNetUnfolder]: 97842/130448 cut-off events. [2023-09-01 10:12:43,329 INFO L131 PetriNetUnfolder]: For 650/650 co-relation queries the response was YES. [2023-09-01 10:12:43,481 INFO L83 FinitePrefix]: Finished finitePrefix Result has 262215 conditions, 130448 events. 97842/130448 cut-off events. For 650/650 co-relation queries the response was YES. Maximal size of possible extension queue 2914. Compared 768574 event pairs, 0 based on Foata normal form. 15000/118825 useless extension candidates. Maximal degree in co-relation 262195. Up to 69125 conditions per place. [2023-09-01 10:12:43,591 INFO L137 encePairwiseOnDemand]: 1126/1129 looper letters, 0 selfloop transitions, 0 changer transitions 283/283 dead transitions. [2023-09-01 10:12:43,591 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 97 places, 283 transitions, 1163 flow [2023-09-01 10:12:43,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-09-01 10:12:43,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-09-01 10:12:43,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 3401 transitions. [2023-09-01 10:12:43,599 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5020667257159729 [2023-09-01 10:12:43,599 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 3401 transitions. [2023-09-01 10:12:43,599 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 3401 transitions. [2023-09-01 10:12:43,601 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 10:12:43,601 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 3401 transitions. [2023-09-01 10:12:43,607 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 566.8333333333334) internal successors, (3401), 6 states have internal predecessors, (3401), 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) [2023-09-01 10:12:43,615 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 1129.0) internal successors, (7903), 7 states have internal predecessors, (7903), 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) [2023-09-01 10:12:43,616 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 1129.0) internal successors, (7903), 7 states have internal predecessors, (7903), 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) [2023-09-01 10:12:43,616 INFO L175 Difference]: Start difference. First operand has 93 places, 101 transitions, 237 flow. Second operand 6 states and 3401 transitions. [2023-09-01 10:12:43,616 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 97 places, 283 transitions, 1163 flow [2023-09-01 10:12:43,677 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 94 places, 283 transitions, 1154 flow, removed 2 selfloop flow, removed 3 redundant places. [2023-09-01 10:12:43,679 INFO L231 Difference]: Finished difference. Result has 94 places, 0 transitions, 0 flow [2023-09-01 10:12:43,679 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1129, PETRI_DIFFERENCE_MINUEND_FLOW=224, PETRI_DIFFERENCE_MINUEND_PLACES=89, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=100, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=100, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=0, PETRI_PLACES=94, PETRI_TRANSITIONS=0} [2023-09-01 10:12:43,681 INFO L281 CegarLoopForPetriNet]: 92 programPoint places, 2 predicate places. [2023-09-01 10:12:43,681 INFO L495 AbstractCegarLoop]: Abstraction has has 94 places, 0 transitions, 0 flow [2023-09-01 10:12:43,682 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 522.1666666666666) internal successors, (3133), 6 states have internal predecessors, (3133), 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) [2023-09-01 10:12:43,682 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-09-01 10:12:43,690 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-09-01 10:12:43,890 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-09-01 10:12:43,891 INFO L445 BasicCegarLoop]: Path program histogram: [2, 1] [2023-09-01 10:12:43,891 INFO L307 ceAbstractionStarter]: Result for error location InUseError was SAFE (1/2) [2023-09-01 10:12:43,897 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 542 places, 578 transitions, 1186 flow [2023-09-01 10:12:44,017 INFO L130 PetriNetUnfolder]: 58/691 cut-off events. [2023-09-01 10:12:44,017 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-09-01 10:12:44,030 INFO L83 FinitePrefix]: Finished finitePrefix Result has 719 conditions, 691 events. 58/691 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 16. Compared 2904 event pairs, 1 based on Foata normal form. 0/626 useless extension candidates. Maximal degree in co-relation 549. Up to 16 conditions per place. [2023-09-01 10:12:44,030 INFO L82 GeneralOperation]: Start removeDead. Operand has 542 places, 578 transitions, 1186 flow [2023-09-01 10:12:44,035 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 542 places, 578 transitions, 1186 flow [2023-09-01 10:12:44,035 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-09-01 10:12:44,036 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 542 places, 578 transitions, 1186 flow [2023-09-01 10:12:44,036 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 542 places, 578 transitions, 1186 flow [2023-09-01 10:12:44,036 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 542 places, 578 transitions, 1186 flow [2023-09-01 10:12:44,126 INFO L130 PetriNetUnfolder]: 58/691 cut-off events. [2023-09-01 10:12:44,126 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-09-01 10:12:44,135 INFO L83 FinitePrefix]: Finished finitePrefix Result has 719 conditions, 691 events. 58/691 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 16. Compared 2904 event pairs, 1 based on Foata normal form. 0/626 useless extension candidates. Maximal degree in co-relation 549. Up to 16 conditions per place. [2023-09-01 10:12:44,182 INFO L119 LiptonReduction]: Number of co-enabled transitions 185820 [2023-09-01 10:12:55,277 INFO L134 LiptonReduction]: Checked pairs total: 200067 [2023-09-01 10:12:55,277 INFO L136 LiptonReduction]: Total number of compositions: 544 [2023-09-01 10:12:55,279 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-09-01 10:12:55,280 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;@1679d7d1, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-09-01 10:12:55,280 INFO L358 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2023-09-01 10:12:55,282 INFO L130 PetriNetUnfolder]: 1/20 cut-off events. [2023-09-01 10:12:55,282 INFO L131 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2023-09-01 10:12:55,282 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 10:12:55,282 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-09-01 10:12:55,283 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting threadErr0ASSERT_VIOLATIONERROR_FUNCTION === [threadErr0ASSERT_VIOLATIONERROR_FUNCTION, threadErr0ASSERT_VIOLATIONERROR_FUNCTION, threadErr0ASSERT_VIOLATIONERROR_FUNCTION (and 1 more)] === [2023-09-01 10:12:55,283 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 10:12:55,283 INFO L85 PathProgramCache]: Analyzing trace with hash -1517659047, now seen corresponding path program 1 times [2023-09-01 10:12:55,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 10:12:55,283 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1412933808] [2023-09-01 10:12:55,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 10:12:55,283 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 10:12:55,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 10:12:55,351 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-09-01 10:12:55,352 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 10:12:55,352 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1412933808] [2023-09-01 10:12:55,352 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1412933808] provided 1 perfect and 0 imperfect interpolant sequences [2023-09-01 10:12:55,352 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-09-01 10:12:55,352 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-09-01 10:12:55,352 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166751591] [2023-09-01 10:12:55,352 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-09-01 10:12:55,353 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-09-01 10:12:55,353 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 10:12:55,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-09-01 10:12:55,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-09-01 10:12:55,368 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 525 out of 1122 [2023-09-01 10:12:55,370 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 96 places, 118 transitions, 266 flow. Second operand has 3 states, 3 states have (on average 527.6666666666666) internal successors, (1583), 3 states have internal predecessors, (1583), 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) [2023-09-01 10:12:55,370 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 10:12:55,370 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 525 of 1122 [2023-09-01 10:12:55,370 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 10:13:26,411 INFO L130 PetriNetUnfolder]: 385062/501898 cut-off events. [2023-09-01 10:13:26,411 INFO L131 PetriNetUnfolder]: For 10410/10410 co-relation queries the response was YES. [2023-09-01 10:13:26,862 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1008140 conditions, 501898 events. 385062/501898 cut-off events. For 10410/10410 co-relation queries the response was YES. Maximal size of possible extension queue 8092. Compared 3183073 event pairs, 306526 based on Foata normal form. 0/373192 useless extension candidates. Maximal degree in co-relation 242253. Up to 501056 conditions per place. [2023-09-01 10:13:28,336 INFO L137 encePairwiseOnDemand]: 1112/1122 looper letters, 107 selfloop transitions, 2 changer transitions 0/112 dead transitions. [2023-09-01 10:13:28,337 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 98 places, 112 transitions, 472 flow [2023-09-01 10:13:28,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-09-01 10:13:28,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-09-01 10:13:28,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 1692 transitions. [2023-09-01 10:13:28,341 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5026737967914439 [2023-09-01 10:13:28,341 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 1692 transitions. [2023-09-01 10:13:28,341 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 1692 transitions. [2023-09-01 10:13:28,342 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 10:13:28,342 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 1692 transitions. [2023-09-01 10:13:28,344 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 564.0) internal successors, (1692), 3 states have internal predecessors, (1692), 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) [2023-09-01 10:13:28,348 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 1122.0) internal successors, (4488), 4 states have internal predecessors, (4488), 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) [2023-09-01 10:13:28,349 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 1122.0) internal successors, (4488), 4 states have internal predecessors, (4488), 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) [2023-09-01 10:13:28,349 INFO L175 Difference]: Start difference. First operand has 96 places, 118 transitions, 266 flow. Second operand 3 states and 1692 transitions. [2023-09-01 10:13:28,349 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 98 places, 112 transitions, 472 flow [2023-09-01 10:13:28,352 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 98 places, 112 transitions, 472 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-09-01 10:13:28,354 INFO L231 Difference]: Finished difference. Result has 99 places, 112 transitions, 264 flow [2023-09-01 10:13:28,354 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1122, PETRI_DIFFERENCE_MINUEND_FLOW=252, PETRI_DIFFERENCE_MINUEND_PLACES=96, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=111, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=109, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=264, PETRI_PLACES=99, PETRI_TRANSITIONS=112} [2023-09-01 10:13:28,355 INFO L281 CegarLoopForPetriNet]: 96 programPoint places, 3 predicate places. [2023-09-01 10:13:28,355 INFO L495 AbstractCegarLoop]: Abstraction has has 99 places, 112 transitions, 264 flow [2023-09-01 10:13:28,355 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 527.6666666666666) internal successors, (1583), 3 states have internal predecessors, (1583), 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) [2023-09-01 10:13:28,355 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 10:13:28,356 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-09-01 10:13:28,356 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-09-01 10:13:28,356 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting threadErr0ASSERT_VIOLATIONERROR_FUNCTION === [threadErr0ASSERT_VIOLATIONERROR_FUNCTION, threadErr0ASSERT_VIOLATIONERROR_FUNCTION, threadErr0ASSERT_VIOLATIONERROR_FUNCTION (and 1 more)] === [2023-09-01 10:13:28,356 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 10:13:28,356 INFO L85 PathProgramCache]: Analyzing trace with hash -1796388265, now seen corresponding path program 1 times [2023-09-01 10:13:28,356 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 10:13:28,357 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [597700355] [2023-09-01 10:13:28,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 10:13:28,357 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 10:13:28,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 10:13:28,451 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-09-01 10:13:28,452 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 10:13:28,452 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [597700355] [2023-09-01 10:13:28,452 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [597700355] provided 1 perfect and 0 imperfect interpolant sequences [2023-09-01 10:13:28,452 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-09-01 10:13:28,452 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-09-01 10:13:28,452 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417133492] [2023-09-01 10:13:28,453 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-09-01 10:13:28,453 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-09-01 10:13:28,453 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 10:13:28,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-09-01 10:13:28,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-09-01 10:13:28,462 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 526 out of 1122 [2023-09-01 10:13:28,463 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 99 places, 112 transitions, 264 flow. Second operand has 3 states, 3 states have (on average 529.6666666666666) internal successors, (1589), 3 states have internal predecessors, (1589), 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) [2023-09-01 10:13:28,463 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 10:13:28,463 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 526 of 1122 [2023-09-01 10:13:28,464 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 10:14:16,623 INFO L130 PetriNetUnfolder]: 562677/731457 cut-off events. [2023-09-01 10:14:16,624 INFO L131 PetriNetUnfolder]: For 14343/14343 co-relation queries the response was YES. [2023-09-01 10:14:17,451 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1469366 conditions, 731457 events. 562677/731457 cut-off events. For 14343/14343 co-relation queries the response was YES. Maximal size of possible extension queue 10034. Compared 4802940 event pairs, 306526 based on Foata normal form. 0/545388 useless extension candidates. Maximal degree in co-relation 1469352. Up to 496708 conditions per place. [2023-09-01 10:14:19,698 INFO L137 encePairwiseOnDemand]: 1118/1122 looper letters, 193 selfloop transitions, 3 changer transitions 0/199 dead transitions. [2023-09-01 10:14:19,698 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 101 places, 199 transitions, 848 flow [2023-09-01 10:14:19,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-09-01 10:14:19,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-09-01 10:14:19,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 1774 transitions. [2023-09-01 10:14:19,703 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5270350564468211 [2023-09-01 10:14:19,703 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 1774 transitions. [2023-09-01 10:14:19,703 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 1774 transitions. [2023-09-01 10:14:19,704 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 10:14:19,704 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 1774 transitions. [2023-09-01 10:14:19,707 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 591.3333333333334) internal successors, (1774), 3 states have internal predecessors, (1774), 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) [2023-09-01 10:14:19,711 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 1122.0) internal successors, (4488), 4 states have internal predecessors, (4488), 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) [2023-09-01 10:14:19,712 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 1122.0) internal successors, (4488), 4 states have internal predecessors, (4488), 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) [2023-09-01 10:14:19,712 INFO L175 Difference]: Start difference. First operand has 99 places, 112 transitions, 264 flow. Second operand 3 states and 1774 transitions. [2023-09-01 10:14:19,712 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 101 places, 199 transitions, 848 flow [2023-09-01 10:14:19,719 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 100 places, 199 transitions, 844 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-09-01 10:14:19,721 INFO L231 Difference]: Finished difference. Result has 102 places, 115 transitions, 286 flow [2023-09-01 10:14:19,721 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1122, PETRI_DIFFERENCE_MINUEND_FLOW=260, PETRI_DIFFERENCE_MINUEND_PLACES=98, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=112, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=109, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=286, PETRI_PLACES=102, PETRI_TRANSITIONS=115} [2023-09-01 10:14:19,722 INFO L281 CegarLoopForPetriNet]: 96 programPoint places, 6 predicate places. [2023-09-01 10:14:19,722 INFO L495 AbstractCegarLoop]: Abstraction has has 102 places, 115 transitions, 286 flow [2023-09-01 10:14:19,722 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 529.6666666666666) internal successors, (1589), 3 states have internal predecessors, (1589), 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) [2023-09-01 10:14:19,722 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 10:14:19,723 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-09-01 10:14:19,723 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-09-01 10:14:19,723 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting threadErr0ASSERT_VIOLATIONERROR_FUNCTION === [threadErr0ASSERT_VIOLATIONERROR_FUNCTION, threadErr0ASSERT_VIOLATIONERROR_FUNCTION, threadErr0ASSERT_VIOLATIONERROR_FUNCTION (and 1 more)] === [2023-09-01 10:14:19,723 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 10:14:19,723 INFO L85 PathProgramCache]: Analyzing trace with hash 1838227769, now seen corresponding path program 1 times [2023-09-01 10:14:19,723 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 10:14:19,724 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [268791755] [2023-09-01 10:14:19,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 10:14:19,724 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 10:14:19,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 10:14:19,827 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-09-01 10:14:19,828 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 10:14:19,828 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [268791755] [2023-09-01 10:14:19,828 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [268791755] provided 1 perfect and 0 imperfect interpolant sequences [2023-09-01 10:14:19,828 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-09-01 10:14:19,828 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-09-01 10:14:19,830 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542579106] [2023-09-01 10:14:19,830 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-09-01 10:14:19,830 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-09-01 10:14:19,831 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 10:14:19,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-09-01 10:14:19,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-09-01 10:14:19,965 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 515 out of 1122 [2023-09-01 10:14:19,967 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 102 places, 115 transitions, 286 flow. Second operand has 3 states, 3 states have (on average 519.3333333333334) internal successors, (1558), 3 states have internal predecessors, (1558), 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) [2023-09-01 10:14:19,967 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 10:14:19,967 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 515 of 1122 [2023-09-01 10:14:19,967 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 10:15:25,294 INFO L130 PetriNetUnfolder]: 682910/890252 cut-off events. [2023-09-01 10:15:25,294 INFO L131 PetriNetUnfolder]: For 81917/81917 co-relation queries the response was YES. [2023-09-01 10:15:26,383 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1841526 conditions, 890252 events. 682910/890252 cut-off events. For 81917/81917 co-relation queries the response was YES. Maximal size of possible extension queue 12555. Compared 5982686 event pairs, 408758 based on Foata normal form. 0/688173 useless extension candidates. Maximal degree in co-relation 1841507. Up to 750619 conditions per place. [2023-09-01 10:15:29,035 INFO L137 encePairwiseOnDemand]: 1102/1122 looper letters, 173 selfloop transitions, 19 changer transitions 0/195 dead transitions. [2023-09-01 10:15:29,035 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 104 places, 195 transitions, 863 flow [2023-09-01 10:15:29,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-09-01 10:15:29,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-09-01 10:15:29,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 1731 transitions. [2023-09-01 10:15:29,039 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5142602495543672 [2023-09-01 10:15:29,039 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 1731 transitions. [2023-09-01 10:15:29,039 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 1731 transitions. [2023-09-01 10:15:29,040 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 10:15:29,040 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 1731 transitions. [2023-09-01 10:15:29,043 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 577.0) internal successors, (1731), 3 states have internal predecessors, (1731), 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) [2023-09-01 10:15:29,047 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 1122.0) internal successors, (4488), 4 states have internal predecessors, (4488), 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) [2023-09-01 10:15:29,047 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 1122.0) internal successors, (4488), 4 states have internal predecessors, (4488), 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) [2023-09-01 10:15:29,047 INFO L175 Difference]: Start difference. First operand has 102 places, 115 transitions, 286 flow. Second operand 3 states and 1731 transitions. [2023-09-01 10:15:29,048 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 104 places, 195 transitions, 863 flow [2023-09-01 10:15:33,360 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 102 places, 195 transitions, 851 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-09-01 10:15:33,362 INFO L231 Difference]: Finished difference. Result has 104 places, 133 transitions, 432 flow [2023-09-01 10:15:33,362 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1122, PETRI_DIFFERENCE_MINUEND_FLOW=280, PETRI_DIFFERENCE_MINUEND_PLACES=100, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=115, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=96, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=432, PETRI_PLACES=104, PETRI_TRANSITIONS=133} [2023-09-01 10:15:33,363 INFO L281 CegarLoopForPetriNet]: 96 programPoint places, 8 predicate places. [2023-09-01 10:15:33,363 INFO L495 AbstractCegarLoop]: Abstraction has has 104 places, 133 transitions, 432 flow [2023-09-01 10:15:33,363 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 519.3333333333334) internal successors, (1558), 3 states have internal predecessors, (1558), 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) [2023-09-01 10:15:33,363 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 10:15:33,364 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-09-01 10:15:33,364 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-09-01 10:15:33,364 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting threadErr0ASSERT_VIOLATIONERROR_FUNCTION === [threadErr0ASSERT_VIOLATIONERROR_FUNCTION, threadErr0ASSERT_VIOLATIONERROR_FUNCTION, threadErr0ASSERT_VIOLATIONERROR_FUNCTION (and 1 more)] === [2023-09-01 10:15:33,364 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 10:15:33,364 INFO L85 PathProgramCache]: Analyzing trace with hash 722065365, now seen corresponding path program 2 times [2023-09-01 10:15:33,365 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 10:15:33,365 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2040911679] [2023-09-01 10:15:33,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 10:15:33,365 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 10:15:33,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 10:15:33,448 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-09-01 10:15:33,449 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 10:15:33,449 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2040911679] [2023-09-01 10:15:33,449 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2040911679] provided 0 perfect and 1 imperfect interpolant sequences [2023-09-01 10:15:33,449 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1122330423] [2023-09-01 10:15:33,449 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-09-01 10:15:33,449 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-09-01 10:15:33,450 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-09-01 10:15:33,452 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) [2023-09-01 10:15:33,453 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-09-01 10:15:33,624 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-09-01 10:15:33,625 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-09-01 10:15:33,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 5 conjunts are in the unsatisfiable core [2023-09-01 10:15:33,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-09-01 10:15:33,649 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-09-01 10:15:33,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-09-01 10:15:33,665 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-09-01 10:15:33,665 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1122330423] provided 0 perfect and 2 imperfect interpolant sequences [2023-09-01 10:15:33,665 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-09-01 10:15:33,665 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 7 [2023-09-01 10:15:33,665 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157716431] [2023-09-01 10:15:33,666 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-09-01 10:15:33,666 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-09-01 10:15:33,666 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 10:15:33,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-09-01 10:15:33,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2023-09-01 10:15:33,699 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 523 out of 1122 [2023-09-01 10:15:33,702 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 104 places, 133 transitions, 432 flow. Second operand has 8 states, 8 states have (on average 525.375) internal successors, (4203), 8 states have internal predecessors, (4203), 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) [2023-09-01 10:15:33,702 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 10:15:33,702 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 523 of 1122 [2023-09-01 10:15:33,702 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 10:16:39,486 INFO L130 PetriNetUnfolder]: 682910/890422 cut-off events. [2023-09-01 10:16:39,487 INFO L131 PetriNetUnfolder]: For 182882/182882 co-relation queries the response was YES. [2023-09-01 10:16:40,929 INFO L83 FinitePrefix]: Finished finitePrefix Result has 2050459 conditions, 890422 events. 682910/890422 cut-off events. For 182882/182882 co-relation queries the response was YES. Maximal size of possible extension queue 12557. Compared 5945478 event pairs, 512920 based on Foata normal form. 0/741391 useless extension candidates. Maximal degree in co-relation 2050436. Up to 888894 conditions per place. [2023-09-01 10:16:43,848 INFO L137 encePairwiseOnDemand]: 1119/1122 looper letters, 128 selfloop transitions, 3 changer transitions 0/134 dead transitions. [2023-09-01 10:16:43,848 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 107 places, 134 transitions, 698 flow [2023-09-01 10:16:43,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-09-01 10:16:43,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-09-01 10:16:43,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 2203 transitions. [2023-09-01 10:16:43,852 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4908645276292335 [2023-09-01 10:16:43,853 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 2203 transitions. [2023-09-01 10:16:43,853 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 2203 transitions. [2023-09-01 10:16:43,854 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 10:16:43,854 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 2203 transitions. [2023-09-01 10:16:43,857 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 550.75) internal successors, (2203), 4 states have internal predecessors, (2203), 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) [2023-09-01 10:16:43,862 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 1122.0) internal successors, (5610), 5 states have internal predecessors, (5610), 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) [2023-09-01 10:16:43,864 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 1122.0) internal successors, (5610), 5 states have internal predecessors, (5610), 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) [2023-09-01 10:16:43,864 INFO L175 Difference]: Start difference. First operand has 104 places, 133 transitions, 432 flow. Second operand 4 states and 2203 transitions. [2023-09-01 10:16:43,864 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 107 places, 134 transitions, 698 flow [2023-09-01 10:17:16,779 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 105 places, 134 transitions, 660 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-09-01 10:17:16,780 INFO L231 Difference]: Finished difference. Result has 106 places, 134 transitions, 410 flow [2023-09-01 10:17:16,780 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1122, PETRI_DIFFERENCE_MINUEND_FLOW=394, PETRI_DIFFERENCE_MINUEND_PLACES=102, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=133, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=130, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=410, PETRI_PLACES=106, PETRI_TRANSITIONS=134} [2023-09-01 10:17:16,781 INFO L281 CegarLoopForPetriNet]: 96 programPoint places, 10 predicate places. [2023-09-01 10:17:16,781 INFO L495 AbstractCegarLoop]: Abstraction has has 106 places, 134 transitions, 410 flow [2023-09-01 10:17:16,781 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 525.375) internal successors, (4203), 8 states have internal predecessors, (4203), 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) [2023-09-01 10:17:16,782 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 10:17:16,782 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-09-01 10:17:16,792 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-09-01 10:17:16,988 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,SelfDestructingSolverStorable12 [2023-09-01 10:17:16,989 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting threadErr0ASSERT_VIOLATIONERROR_FUNCTION === [threadErr0ASSERT_VIOLATIONERROR_FUNCTION, threadErr0ASSERT_VIOLATIONERROR_FUNCTION, threadErr0ASSERT_VIOLATIONERROR_FUNCTION (and 1 more)] === [2023-09-01 10:17:16,989 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 10:17:16,989 INFO L85 PathProgramCache]: Analyzing trace with hash -1953918568, now seen corresponding path program 3 times [2023-09-01 10:17:16,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 10:17:16,989 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [942800804] [2023-09-01 10:17:16,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 10:17:16,989 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 10:17:17,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 10:17:17,079 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-09-01 10:17:17,079 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 10:17:17,079 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [942800804] [2023-09-01 10:17:17,080 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [942800804] provided 1 perfect and 0 imperfect interpolant sequences [2023-09-01 10:17:17,080 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-09-01 10:17:17,080 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-09-01 10:17:17,081 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1850694381] [2023-09-01 10:17:17,081 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-09-01 10:17:17,082 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-09-01 10:17:17,082 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 10:17:17,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-09-01 10:17:17,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-09-01 10:17:17,089 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 528 out of 1122 [2023-09-01 10:17:17,090 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 106 places, 134 transitions, 410 flow. Second operand has 3 states, 3 states have (on average 532.6666666666666) internal successors, (1598), 3 states have internal predecessors, (1598), 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) [2023-09-01 10:17:17,090 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 10:17:17,090 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 528 of 1122 [2023-09-01 10:17:17,090 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 10:18:24,433 INFO L130 PetriNetUnfolder]: 702953/916692 cut-off events. [2023-09-01 10:18:24,433 INFO L131 PetriNetUnfolder]: For 121777/121777 co-relation queries the response was YES. [2023-09-01 10:18:25,811 INFO L83 FinitePrefix]: Finished finitePrefix Result has 2064439 conditions, 916692 events. 702953/916692 cut-off events. For 121777/121777 co-relation queries the response was YES. Maximal size of possible extension queue 10828. Compared 6048374 event pairs, 512920 based on Foata normal form. 6302/764077 useless extension candidates. Maximal degree in co-relation 2064417. Up to 888896 conditions per place. [2023-09-01 10:18:28,932 INFO L137 encePairwiseOnDemand]: 1119/1122 looper letters, 204 selfloop transitions, 2 changer transitions 0/209 dead transitions. [2023-09-01 10:18:28,933 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 108 places, 209 transitions, 1031 flow [2023-09-01 10:18:28,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-09-01 10:18:28,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-09-01 10:18:28,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 1765 transitions. [2023-09-01 10:18:28,935 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5243612596553773 [2023-09-01 10:18:28,936 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 1765 transitions. [2023-09-01 10:18:28,936 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 1765 transitions. [2023-09-01 10:18:28,936 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 10:18:28,937 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 1765 transitions. [2023-09-01 10:18:28,939 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 588.3333333333334) internal successors, (1765), 3 states have internal predecessors, (1765), 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) [2023-09-01 10:18:28,943 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 1122.0) internal successors, (4488), 4 states have internal predecessors, (4488), 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) [2023-09-01 10:18:28,944 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 1122.0) internal successors, (4488), 4 states have internal predecessors, (4488), 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) [2023-09-01 10:18:28,944 INFO L175 Difference]: Start difference. First operand has 106 places, 134 transitions, 410 flow. Second operand 3 states and 1765 transitions. [2023-09-01 10:18:28,944 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 108 places, 209 transitions, 1031 flow [2023-09-01 10:18:28,988 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 106 places, 209 transitions, 1023 flow, removed 2 selfloop flow, removed 2 redundant places. [2023-09-01 10:18:28,990 INFO L231 Difference]: Finished difference. Result has 107 places, 135 transitions, 414 flow [2023-09-01 10:18:28,990 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1122, PETRI_DIFFERENCE_MINUEND_FLOW=402, PETRI_DIFFERENCE_MINUEND_PLACES=104, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=134, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=132, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=414, PETRI_PLACES=107, PETRI_TRANSITIONS=135} [2023-09-01 10:18:28,990 INFO L281 CegarLoopForPetriNet]: 96 programPoint places, 11 predicate places. [2023-09-01 10:18:28,991 INFO L495 AbstractCegarLoop]: Abstraction has has 107 places, 135 transitions, 414 flow [2023-09-01 10:18:28,991 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 532.6666666666666) internal successors, (1598), 3 states have internal predecessors, (1598), 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) [2023-09-01 10:18:28,991 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 10:18:28,991 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-09-01 10:18:28,992 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-09-01 10:18:28,992 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting threadErr0ASSERT_VIOLATIONERROR_FUNCTION === [threadErr0ASSERT_VIOLATIONERROR_FUNCTION, threadErr0ASSERT_VIOLATIONERROR_FUNCTION, threadErr0ASSERT_VIOLATIONERROR_FUNCTION (and 1 more)] === [2023-09-01 10:18:28,992 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 10:18:28,992 INFO L85 PathProgramCache]: Analyzing trace with hash -1920129112, now seen corresponding path program 1 times [2023-09-01 10:18:28,992 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 10:18:28,992 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1796443203] [2023-09-01 10:18:28,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 10:18:28,993 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 10:18:29,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 10:18:29,115 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-09-01 10:18:29,115 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 10:18:29,115 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1796443203] [2023-09-01 10:18:29,115 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1796443203] provided 1 perfect and 0 imperfect interpolant sequences [2023-09-01 10:18:29,115 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-09-01 10:18:29,116 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-09-01 10:18:29,116 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754991951] [2023-09-01 10:18:29,116 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-09-01 10:18:29,116 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-09-01 10:18:29,116 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 10:18:29,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-09-01 10:18:29,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-09-01 10:18:29,243 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 515 out of 1122 [2023-09-01 10:18:29,244 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 107 places, 135 transitions, 414 flow. Second operand has 3 states, 3 states have (on average 521.0) internal successors, (1563), 3 states have internal predecessors, (1563), 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) [2023-09-01 10:18:29,244 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 10:18:29,244 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 515 of 1122 [2023-09-01 10:18:29,244 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 10:19:47,471 INFO L130 PetriNetUnfolder]: 805064/1052433 cut-off events. [2023-09-01 10:19:47,471 INFO L131 PetriNetUnfolder]: For 182702/182702 co-relation queries the response was YES. [2023-09-01 10:19:49,268 INFO L83 FinitePrefix]: Finished finitePrefix Result has 2400773 conditions, 1052433 events. 805064/1052433 cut-off events. For 182702/182702 co-relation queries the response was YES. Maximal size of possible extension queue 12521. Compared 7131971 event pairs, 499837 based on Foata normal form. 0/882233 useless extension candidates. Maximal degree in co-relation 2400746. Up to 931382 conditions per place. [2023-09-01 10:19:52,693 INFO L137 encePairwiseOnDemand]: 1103/1122 looper letters, 193 selfloop transitions, 30 changer transitions 0/226 dead transitions. [2023-09-01 10:19:52,693 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 109 places, 226 transitions, 1122 flow [2023-09-01 10:19:52,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-09-01 10:19:52,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-09-01 10:19:52,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 1732 transitions. [2023-09-01 10:19:52,697 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5145573380867499 [2023-09-01 10:19:52,697 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 1732 transitions. [2023-09-01 10:19:52,697 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 1732 transitions. [2023-09-01 10:19:52,698 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 10:19:52,698 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 1732 transitions. [2023-09-01 10:19:52,701 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 577.3333333333334) internal successors, (1732), 3 states have internal predecessors, (1732), 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) [2023-09-01 10:19:52,704 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 1122.0) internal successors, (4488), 4 states have internal predecessors, (4488), 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) [2023-09-01 10:19:52,705 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 1122.0) internal successors, (4488), 4 states have internal predecessors, (4488), 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) [2023-09-01 10:19:52,705 INFO L175 Difference]: Start difference. First operand has 107 places, 135 transitions, 414 flow. Second operand 3 states and 1732 transitions. [2023-09-01 10:19:52,705 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 109 places, 226 transitions, 1122 flow [2023-09-01 10:20:03,398 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 108 places, 226 transitions, 1118 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-09-01 10:20:03,402 INFO L231 Difference]: Finished difference. Result has 110 places, 163 transitions, 694 flow [2023-09-01 10:20:03,402 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1122, PETRI_DIFFERENCE_MINUEND_FLOW=412, PETRI_DIFFERENCE_MINUEND_PLACES=106, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=135, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=105, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=694, PETRI_PLACES=110, PETRI_TRANSITIONS=163} [2023-09-01 10:20:03,403 INFO L281 CegarLoopForPetriNet]: 96 programPoint places, 14 predicate places. [2023-09-01 10:20:03,403 INFO L495 AbstractCegarLoop]: Abstraction has has 110 places, 163 transitions, 694 flow [2023-09-01 10:20:03,404 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 521.0) internal successors, (1563), 3 states have internal predecessors, (1563), 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) [2023-09-01 10:20:03,404 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 10:20:03,404 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-09-01 10:20:03,404 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-09-01 10:20:03,404 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting threadErr0ASSERT_VIOLATIONERROR_FUNCTION === [threadErr0ASSERT_VIOLATIONERROR_FUNCTION, threadErr0ASSERT_VIOLATIONERROR_FUNCTION, threadErr0ASSERT_VIOLATIONERROR_FUNCTION (and 1 more)] === [2023-09-01 10:20:03,405 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 10:20:03,405 INFO L85 PathProgramCache]: Analyzing trace with hash 1321025742, now seen corresponding path program 1 times [2023-09-01 10:20:03,405 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 10:20:03,405 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1535089607] [2023-09-01 10:20:03,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 10:20:03,405 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 10:20:03,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 10:20:03,565 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-09-01 10:20:03,565 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 10:20:03,565 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1535089607] [2023-09-01 10:20:03,566 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1535089607] provided 1 perfect and 0 imperfect interpolant sequences [2023-09-01 10:20:03,566 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-09-01 10:20:03,566 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-09-01 10:20:03,566 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956168276] [2023-09-01 10:20:03,566 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-09-01 10:20:03,567 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-09-01 10:20:03,567 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 10:20:03,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-09-01 10:20:03,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-09-01 10:20:03,576 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 526 out of 1122 [2023-09-01 10:20:03,577 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 110 places, 163 transitions, 694 flow. Second operand has 3 states, 3 states have (on average 530.6666666666666) internal successors, (1592), 3 states have internal predecessors, (1592), 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) [2023-09-01 10:20:03,577 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 10:20:03,577 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 526 of 1122 [2023-09-01 10:20:03,577 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand