./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/pthread-ext/48_ticket_lock_low_contention_vs.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version eb692b52 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/pthread-ext/48_ticket_lock_low_contention_vs.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 31f5db4bc5916150a86a586587dbeca1bc7aa37b414274f5dc02856908270171 --- Real Ultimate output --- This is Ultimate 0.2.2-?-eb692b5 [2022-07-19 21:05:18,363 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-19 21:05:18,365 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-19 21:05:18,383 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-19 21:05:18,384 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-19 21:05:18,384 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-19 21:05:18,385 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-19 21:05:18,386 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-19 21:05:18,387 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-19 21:05:18,388 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-19 21:05:18,389 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-19 21:05:18,389 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-19 21:05:18,390 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-19 21:05:18,390 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-19 21:05:18,391 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-19 21:05:18,392 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-19 21:05:18,392 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-19 21:05:18,393 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-19 21:05:18,394 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-19 21:05:18,395 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-19 21:05:18,396 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-19 21:05:18,396 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-19 21:05:18,397 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-19 21:05:18,398 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-19 21:05:18,398 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-19 21:05:18,400 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-19 21:05:18,400 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-19 21:05:18,401 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-19 21:05:18,401 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-19 21:05:18,401 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-19 21:05:18,402 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-19 21:05:18,402 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-19 21:05:18,403 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-19 21:05:18,403 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-19 21:05:18,404 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-19 21:05:18,404 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-19 21:05:18,405 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-19 21:05:18,405 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-19 21:05:18,405 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-19 21:05:18,406 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-19 21:05:18,406 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-19 21:05:18,407 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-19 21:05:18,407 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2022-07-19 21:05:18,424 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-19 21:05:18,424 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-19 21:05:18,425 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-19 21:05:18,425 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-19 21:05:18,425 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-19 21:05:18,425 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-19 21:05:18,426 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-19 21:05:18,426 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-19 21:05:18,426 INFO L138 SettingsManager]: * Use SBE=true [2022-07-19 21:05:18,426 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-19 21:05:18,426 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-19 21:05:18,427 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-19 21:05:18,427 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-19 21:05:18,427 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-19 21:05:18,427 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-07-19 21:05:18,427 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-19 21:05:18,427 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-07-19 21:05:18,427 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-19 21:05:18,427 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-07-19 21:05:18,428 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-19 21:05:18,428 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-07-19 21:05:18,428 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-19 21:05:18,428 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-19 21:05:18,428 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-19 21:05:18,428 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-19 21:05:18,429 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-19 21:05:18,429 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-19 21:05:18,429 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-07-19 21:05:18,429 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-07-19 21:05:18,429 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-07-19 21:05:18,429 INFO L138 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2022-07-19 21:05:18,429 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-07-19 21:05:18,429 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-07-19 21:05:18,430 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 31f5db4bc5916150a86a586587dbeca1bc7aa37b414274f5dc02856908270171 [2022-07-19 21:05:18,585 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-19 21:05:18,607 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-19 21:05:18,610 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-19 21:05:18,611 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-19 21:05:18,611 INFO L275 PluginConnector]: CDTParser initialized [2022-07-19 21:05:18,612 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/pthread-ext/48_ticket_lock_low_contention_vs.i [2022-07-19 21:05:18,651 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f23117c13/6966d2b539634a3897f649eb9c6ceac6/FLAG33f8aded0 [2022-07-19 21:05:19,040 INFO L306 CDTParser]: Found 1 translation units. [2022-07-19 21:05:19,041 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/pthread-ext/48_ticket_lock_low_contention_vs.i [2022-07-19 21:05:19,052 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f23117c13/6966d2b539634a3897f649eb9c6ceac6/FLAG33f8aded0 [2022-07-19 21:05:19,391 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f23117c13/6966d2b539634a3897f649eb9c6ceac6 [2022-07-19 21:05:19,393 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-19 21:05:19,400 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-19 21:05:19,401 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-19 21:05:19,401 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-19 21:05:19,404 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-19 21:05:19,404 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.07 09:05:19" (1/1) ... [2022-07-19 21:05:19,405 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@e4ce8f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:05:19, skipping insertion in model container [2022-07-19 21:05:19,405 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.07 09:05:19" (1/1) ... [2022-07-19 21:05:19,410 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-19 21:05:19,435 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-19 21:05:19,560 WARN L611 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2022-07-19 21:05:19,630 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/pthread-ext/48_ticket_lock_low_contention_vs.i[30893,30906] [2022-07-19 21:05:19,635 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-19 21:05:19,640 INFO L203 MainTranslator]: Completed pre-run [2022-07-19 21:05:19,651 WARN L611 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2022-07-19 21:05:19,665 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/pthread-ext/48_ticket_lock_low_contention_vs.i[30893,30906] [2022-07-19 21:05:19,667 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-19 21:05:19,692 INFO L208 MainTranslator]: Completed translation [2022-07-19 21:05:19,693 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:05:19 WrapperNode [2022-07-19 21:05:19,693 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-19 21:05:19,694 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-07-19 21:05:19,694 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-07-19 21:05:19,694 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-07-19 21:05:19,699 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:05:19" (1/1) ... [2022-07-19 21:05:19,708 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:05:19" (1/1) ... [2022-07-19 21:05:19,723 INFO L137 Inliner]: procedures = 173, calls = 24, calls flagged for inlining = 5, calls inlined = 7, statements flattened = 108 [2022-07-19 21:05:19,723 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-07-19 21:05:19,739 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-07-19 21:05:19,740 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-07-19 21:05:19,740 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-07-19 21:05:19,745 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:05:19" (1/1) ... [2022-07-19 21:05:19,746 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:05:19" (1/1) ... [2022-07-19 21:05:19,758 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:05:19" (1/1) ... [2022-07-19 21:05:19,759 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:05:19" (1/1) ... [2022-07-19 21:05:19,773 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:05:19" (1/1) ... [2022-07-19 21:05:19,776 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:05:19" (1/1) ... [2022-07-19 21:05:19,778 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:05:19" (1/1) ... [2022-07-19 21:05:19,789 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-07-19 21:05:19,793 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-07-19 21:05:19,794 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-07-19 21:05:19,794 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-07-19 21:05:19,795 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:05:19" (1/1) ... [2022-07-19 21:05:19,800 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-19 21:05:19,808 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-19 21:05:19,833 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-07-19 21:05:19,859 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-07-19 21:05:19,885 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-07-19 21:05:19,885 INFO L130 BoogieDeclarations]: Found specification of procedure thr1 [2022-07-19 21:05:19,885 INFO L138 BoogieDeclarations]: Found implementation of procedure thr1 [2022-07-19 21:05:19,885 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-07-19 21:05:19,886 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2022-07-19 21:05:19,886 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-07-19 21:05:19,886 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-07-19 21:05:19,886 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-07-19 21:05:19,886 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-07-19 21:05:19,886 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2022-07-19 21:05:19,886 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-07-19 21:05:19,886 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-07-19 21:05:19,887 WARN L208 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2022-07-19 21:05:19,953 INFO L234 CfgBuilder]: Building ICFG [2022-07-19 21:05:19,954 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-07-19 21:05:20,130 INFO L275 CfgBuilder]: Performing block encoding [2022-07-19 21:05:20,184 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-07-19 21:05:20,184 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-07-19 21:05:20,186 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.07 09:05:20 BoogieIcfgContainer [2022-07-19 21:05:20,186 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-07-19 21:05:20,187 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-07-19 21:05:20,187 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-07-19 21:05:20,193 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-07-19 21:05:20,194 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.07 09:05:19" (1/3) ... [2022-07-19 21:05:20,194 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f855400 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.07 09:05:20, skipping insertion in model container [2022-07-19 21:05:20,195 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:05:19" (2/3) ... [2022-07-19 21:05:20,195 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f855400 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.07 09:05:20, skipping insertion in model container [2022-07-19 21:05:20,195 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.07 09:05:20" (3/3) ... [2022-07-19 21:05:20,196 INFO L111 eAbstractionObserver]: Analyzing ICFG 48_ticket_lock_low_contention_vs.i [2022-07-19 21:05:20,201 WARN L143 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2022-07-19 21:05:20,208 INFO L201 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-07-19 21:05:20,208 INFO L160 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2022-07-19 21:05:20,209 INFO L509 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2022-07-19 21:05:20,278 INFO L135 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2022-07-19 21:05:20,300 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 73 places, 75 transitions, 155 flow [2022-07-19 21:05:20,328 INFO L129 PetriNetUnfolder]: 8/113 cut-off events. [2022-07-19 21:05:20,328 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2022-07-19 21:05:20,331 INFO L84 FinitePrefix]: Finished finitePrefix Result has 118 conditions, 113 events. 8/113 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 208 event pairs, 0 based on Foata normal form. 0/100 useless extension candidates. Maximal degree in co-relation 57. Up to 4 conditions per place. [2022-07-19 21:05:20,331 INFO L82 GeneralOperation]: Start removeDead. Operand has 73 places, 75 transitions, 155 flow [2022-07-19 21:05:20,334 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 73 places, 75 transitions, 155 flow [2022-07-19 21:05:20,341 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-19 21:05:20,346 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@4b7a9a2a, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@51bcb28b [2022-07-19 21:05:20,346 INFO L358 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2022-07-19 21:05:20,355 INFO L129 PetriNetUnfolder]: 4/55 cut-off events. [2022-07-19 21:05:20,355 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2022-07-19 21:05:20,355 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-19 21:05:20,356 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-19 21:05:20,356 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 1 more)] === [2022-07-19 21:05:20,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-19 21:05:20,360 INFO L85 PathProgramCache]: Analyzing trace with hash 24858482, now seen corresponding path program 1 times [2022-07-19 21:05:20,366 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-19 21:05:20,366 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [122952638] [2022-07-19 21:05:20,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-19 21:05:20,367 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-19 21:05:20,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-19 21:05:20,510 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-19 21:05:20,510 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-19 21:05:20,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [122952638] [2022-07-19 21:05:20,511 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [122952638] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-19 21:05:20,511 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-19 21:05:20,512 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-19 21:05:20,513 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846993898] [2022-07-19 21:05:20,513 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-19 21:05:20,518 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-07-19 21:05:20,519 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-19 21:05:20,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-07-19 21:05:20,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-07-19 21:05:20,548 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 61 out of 75 [2022-07-19 21:05:20,552 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 73 places, 75 transitions, 155 flow. Second operand has 2 states, 2 states have (on average 62.5) internal successors, (125), 2 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:20,552 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-19 21:05:20,553 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 61 of 75 [2022-07-19 21:05:20,553 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-19 21:05:20,616 INFO L129 PetriNetUnfolder]: 18/173 cut-off events. [2022-07-19 21:05:20,619 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2022-07-19 21:05:20,620 INFO L84 FinitePrefix]: Finished finitePrefix Result has 216 conditions, 173 events. 18/173 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 499 event pairs, 9 based on Foata normal form. 13/164 useless extension candidates. Maximal degree in co-relation 152. Up to 38 conditions per place. [2022-07-19 21:05:20,622 INFO L132 encePairwiseOnDemand]: 72/75 looper letters, 9 selfloop transitions, 0 changer transitions 0/70 dead transitions. [2022-07-19 21:05:20,622 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 72 places, 70 transitions, 163 flow [2022-07-19 21:05:20,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-07-19 21:05:20,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2022-07-19 21:05:20,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 134 transitions. [2022-07-19 21:05:20,631 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.8933333333333333 [2022-07-19 21:05:20,632 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 134 transitions. [2022-07-19 21:05:20,632 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 134 transitions. [2022-07-19 21:05:20,633 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-19 21:05:20,635 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 134 transitions. [2022-07-19 21:05:20,640 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 67.0) internal successors, (134), 2 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:20,645 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 75.0) internal successors, (225), 3 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:20,645 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 75.0) internal successors, (225), 3 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:20,646 INFO L186 Difference]: Start difference. First operand has 73 places, 75 transitions, 155 flow. Second operand 2 states and 134 transitions. [2022-07-19 21:05:20,647 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 72 places, 70 transitions, 163 flow [2022-07-19 21:05:20,651 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 72 places, 70 transitions, 163 flow, removed 0 selfloop flow, removed 0 redundant places. [2022-07-19 21:05:20,653 INFO L242 Difference]: Finished difference. Result has 72 places, 70 transitions, 145 flow [2022-07-19 21:05:20,655 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=75, PETRI_DIFFERENCE_MINUEND_FLOW=145, PETRI_DIFFERENCE_MINUEND_PLACES=71, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=70, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=70, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=145, PETRI_PLACES=72, PETRI_TRANSITIONS=70} [2022-07-19 21:05:20,658 INFO L279 CegarLoopForPetriNet]: 73 programPoint places, -1 predicate places. [2022-07-19 21:05:20,658 INFO L495 AbstractCegarLoop]: Abstraction has has 72 places, 70 transitions, 145 flow [2022-07-19 21:05:20,658 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 62.5) internal successors, (125), 2 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:20,659 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-19 21:05:20,659 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-19 21:05:20,659 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-07-19 21:05:20,659 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 1 more)] === [2022-07-19 21:05:20,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-19 21:05:20,660 INFO L85 PathProgramCache]: Analyzing trace with hash 1969669199, now seen corresponding path program 1 times [2022-07-19 21:05:20,661 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-19 21:05:20,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1300018057] [2022-07-19 21:05:20,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-19 21:05:20,661 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-19 21:05:20,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-19 21:05:20,777 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-19 21:05:20,778 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-19 21:05:20,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1300018057] [2022-07-19 21:05:20,779 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1300018057] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-19 21:05:20,779 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-19 21:05:20,780 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-19 21:05:20,780 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494908456] [2022-07-19 21:05:20,782 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-19 21:05:20,783 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-19 21:05:20,783 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-19 21:05:20,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-19 21:05:20,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-19 21:05:20,786 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 52 out of 75 [2022-07-19 21:05:20,786 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 72 places, 70 transitions, 145 flow. Second operand has 3 states, 3 states have (on average 53.666666666666664) internal successors, (161), 3 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:20,786 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-19 21:05:20,786 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 52 of 75 [2022-07-19 21:05:20,790 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-19 21:05:20,907 INFO L129 PetriNetUnfolder]: 57/289 cut-off events. [2022-07-19 21:05:20,907 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2022-07-19 21:05:20,909 INFO L84 FinitePrefix]: Finished finitePrefix Result has 421 conditions, 289 events. 57/289 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 17. Compared 1143 event pairs, 20 based on Foata normal form. 0/263 useless extension candidates. Maximal degree in co-relation 417. Up to 80 conditions per place. [2022-07-19 21:05:20,911 INFO L132 encePairwiseOnDemand]: 69/75 looper letters, 22 selfloop transitions, 4 changer transitions 6/84 dead transitions. [2022-07-19 21:05:20,911 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 74 places, 84 transitions, 237 flow [2022-07-19 21:05:20,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-19 21:05:20,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2022-07-19 21:05:20,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 190 transitions. [2022-07-19 21:05:20,916 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.8444444444444444 [2022-07-19 21:05:20,916 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 190 transitions. [2022-07-19 21:05:20,916 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 190 transitions. [2022-07-19 21:05:20,917 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-19 21:05:20,917 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 190 transitions. [2022-07-19 21:05:20,918 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 63.333333333333336) internal successors, (190), 3 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:20,919 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 75.0) internal successors, (300), 4 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:20,919 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 75.0) internal successors, (300), 4 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:20,920 INFO L186 Difference]: Start difference. First operand has 72 places, 70 transitions, 145 flow. Second operand 3 states and 190 transitions. [2022-07-19 21:05:20,920 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 74 places, 84 transitions, 237 flow [2022-07-19 21:05:20,921 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 74 places, 84 transitions, 237 flow, removed 0 selfloop flow, removed 0 redundant places. [2022-07-19 21:05:20,922 INFO L242 Difference]: Finished difference. Result has 76 places, 72 transitions, 173 flow [2022-07-19 21:05:20,922 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=75, PETRI_DIFFERENCE_MINUEND_FLOW=145, PETRI_DIFFERENCE_MINUEND_PLACES=72, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=70, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=66, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=173, PETRI_PLACES=76, PETRI_TRANSITIONS=72} [2022-07-19 21:05:20,923 INFO L279 CegarLoopForPetriNet]: 73 programPoint places, 3 predicate places. [2022-07-19 21:05:20,923 INFO L495 AbstractCegarLoop]: Abstraction has has 76 places, 72 transitions, 173 flow [2022-07-19 21:05:20,923 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 53.666666666666664) internal successors, (161), 3 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:20,924 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-19 21:05:20,924 INFO L200 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-19 21:05:20,924 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-07-19 21:05:20,925 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 1 more)] === [2022-07-19 21:05:20,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-19 21:05:20,927 INFO L85 PathProgramCache]: Analyzing trace with hash 1114984198, now seen corresponding path program 1 times [2022-07-19 21:05:20,927 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-19 21:05:20,927 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733779809] [2022-07-19 21:05:20,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-19 21:05:20,927 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-19 21:05:20,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-19 21:05:20,946 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-07-19 21:05:20,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-19 21:05:20,987 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-07-19 21:05:20,992 INFO L271 BasicCegarLoop]: Counterexample is feasible [2022-07-19 21:05:20,994 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (3 of 4 remaining) [2022-07-19 21:05:20,996 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err0ASSERT_VIOLATIONERROR_FUNCTION (2 of 4 remaining) [2022-07-19 21:05:20,997 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (1 of 4 remaining) [2022-07-19 21:05:20,997 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err0ASSERT_VIOLATIONERROR_FUNCTION (0 of 4 remaining) [2022-07-19 21:05:20,998 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-07-19 21:05:20,998 INFO L356 BasicCegarLoop]: Path program histogram: [1, 1, 1] [2022-07-19 21:05:21,000 WARN L231 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2022-07-19 21:05:21,001 INFO L509 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2022-07-19 21:05:21,022 INFO L135 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2022-07-19 21:05:21,027 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 91 places, 93 transitions, 198 flow [2022-07-19 21:05:21,041 INFO L129 PetriNetUnfolder]: 13/171 cut-off events. [2022-07-19 21:05:21,042 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2022-07-19 21:05:21,043 INFO L84 FinitePrefix]: Finished finitePrefix Result has 181 conditions, 171 events. 13/171 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 432 event pairs, 0 based on Foata normal form. 0/150 useless extension candidates. Maximal degree in co-relation 114. Up to 6 conditions per place. [2022-07-19 21:05:21,043 INFO L82 GeneralOperation]: Start removeDead. Operand has 91 places, 93 transitions, 198 flow [2022-07-19 21:05:21,044 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 91 places, 93 transitions, 198 flow [2022-07-19 21:05:21,049 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-19 21:05:21,053 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@4b7a9a2a, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@51bcb28b [2022-07-19 21:05:21,053 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2022-07-19 21:05:21,055 INFO L129 PetriNetUnfolder]: 4/51 cut-off events. [2022-07-19 21:05:21,056 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2022-07-19 21:05:21,056 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-19 21:05:21,056 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-19 21:05:21,056 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 2 more)] === [2022-07-19 21:05:21,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-19 21:05:21,058 INFO L85 PathProgramCache]: Analyzing trace with hash -403506638, now seen corresponding path program 1 times [2022-07-19 21:05:21,058 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-19 21:05:21,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [950088583] [2022-07-19 21:05:21,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-19 21:05:21,059 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-19 21:05:21,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-19 21:05:21,088 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-19 21:05:21,088 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-19 21:05:21,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [950088583] [2022-07-19 21:05:21,088 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [950088583] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-19 21:05:21,088 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-19 21:05:21,089 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-19 21:05:21,089 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003614605] [2022-07-19 21:05:21,089 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-19 21:05:21,089 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-07-19 21:05:21,089 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-19 21:05:21,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-07-19 21:05:21,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-07-19 21:05:21,094 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 72 out of 93 [2022-07-19 21:05:21,095 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 91 places, 93 transitions, 198 flow. Second operand has 2 states, 2 states have (on average 73.5) internal successors, (147), 2 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:21,095 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-19 21:05:21,095 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 72 of 93 [2022-07-19 21:05:21,095 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-19 21:05:21,168 INFO L129 PetriNetUnfolder]: 150/642 cut-off events. [2022-07-19 21:05:21,168 INFO L130 PetriNetUnfolder]: For 14/14 co-relation queries the response was YES. [2022-07-19 21:05:21,170 INFO L84 FinitePrefix]: Finished finitePrefix Result has 895 conditions, 642 events. 150/642 cut-off events. For 14/14 co-relation queries the response was YES. Maximal size of possible extension queue 34. Compared 3705 event pairs, 93 based on Foata normal form. 75/609 useless extension candidates. Maximal degree in co-relation 643. Up to 234 conditions per place. [2022-07-19 21:05:21,171 INFO L132 encePairwiseOnDemand]: 89/93 looper letters, 14 selfloop transitions, 0 changer transitions 0/86 dead transitions. [2022-07-19 21:05:21,172 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 89 places, 86 transitions, 212 flow [2022-07-19 21:05:21,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-07-19 21:05:21,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2022-07-19 21:05:21,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 162 transitions. [2022-07-19 21:05:21,173 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.8709677419354839 [2022-07-19 21:05:21,173 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 162 transitions. [2022-07-19 21:05:21,173 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 162 transitions. [2022-07-19 21:05:21,173 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-19 21:05:21,173 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 162 transitions. [2022-07-19 21:05:21,174 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 81.0) internal successors, (162), 2 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:21,175 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 93.0) internal successors, (279), 3 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:21,175 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 93.0) internal successors, (279), 3 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:21,175 INFO L186 Difference]: Start difference. First operand has 91 places, 93 transitions, 198 flow. Second operand 2 states and 162 transitions. [2022-07-19 21:05:21,175 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 89 places, 86 transitions, 212 flow [2022-07-19 21:05:21,176 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 89 places, 86 transitions, 210 flow, removed 1 selfloop flow, removed 0 redundant places. [2022-07-19 21:05:21,177 INFO L242 Difference]: Finished difference. Result has 89 places, 86 transitions, 182 flow [2022-07-19 21:05:21,177 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=93, PETRI_DIFFERENCE_MINUEND_FLOW=182, PETRI_DIFFERENCE_MINUEND_PLACES=88, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=86, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=86, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=182, PETRI_PLACES=89, PETRI_TRANSITIONS=86} [2022-07-19 21:05:21,178 INFO L279 CegarLoopForPetriNet]: 91 programPoint places, -2 predicate places. [2022-07-19 21:05:21,178 INFO L495 AbstractCegarLoop]: Abstraction has has 89 places, 86 transitions, 182 flow [2022-07-19 21:05:21,178 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 73.5) internal successors, (147), 2 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:21,178 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-19 21:05:21,178 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-19 21:05:21,178 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-07-19 21:05:21,179 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting thr1Err0ASSERT_VIOLATIONERROR_FUNCTION === [thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 2 more)] === [2022-07-19 21:05:21,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-19 21:05:21,179 INFO L85 PathProgramCache]: Analyzing trace with hash 1369996901, now seen corresponding path program 1 times [2022-07-19 21:05:21,179 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-19 21:05:21,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1531062859] [2022-07-19 21:05:21,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-19 21:05:21,180 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-19 21:05:21,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-19 21:05:21,208 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-19 21:05:21,208 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-19 21:05:21,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1531062859] [2022-07-19 21:05:21,209 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1531062859] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-19 21:05:21,209 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-19 21:05:21,209 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-19 21:05:21,209 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627699396] [2022-07-19 21:05:21,209 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-19 21:05:21,209 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-19 21:05:21,210 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-19 21:05:21,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-19 21:05:21,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-19 21:05:21,210 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 59 out of 93 [2022-07-19 21:05:21,211 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 89 places, 86 transitions, 182 flow. Second operand has 3 states, 3 states have (on average 61.0) internal successors, (183), 3 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:21,211 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-19 21:05:21,211 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 59 of 93 [2022-07-19 21:05:21,211 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-19 21:05:21,403 INFO L129 PetriNetUnfolder]: 1077/2533 cut-off events. [2022-07-19 21:05:21,403 INFO L130 PetriNetUnfolder]: For 22/22 co-relation queries the response was YES. [2022-07-19 21:05:21,407 INFO L84 FinitePrefix]: Finished finitePrefix Result has 4273 conditions, 2533 events. 1077/2533 cut-off events. For 22/22 co-relation queries the response was YES. Maximal size of possible extension queue 122. Compared 17461 event pairs, 352 based on Foata normal form. 0/2184 useless extension candidates. Maximal degree in co-relation 4268. Up to 1021 conditions per place. [2022-07-19 21:05:21,414 INFO L132 encePairwiseOnDemand]: 84/93 looper letters, 43 selfloop transitions, 6 changer transitions 0/108 dead transitions. [2022-07-19 21:05:21,414 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 91 places, 108 transitions, 329 flow [2022-07-19 21:05:21,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-19 21:05:21,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2022-07-19 21:05:21,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 229 transitions. [2022-07-19 21:05:21,416 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.8207885304659498 [2022-07-19 21:05:21,416 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 229 transitions. [2022-07-19 21:05:21,416 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 229 transitions. [2022-07-19 21:05:21,416 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-19 21:05:21,416 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 229 transitions. [2022-07-19 21:05:21,417 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 76.33333333333333) internal successors, (229), 3 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:21,418 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 93.0) internal successors, (372), 4 states have internal predecessors, (372), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:21,418 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 93.0) internal successors, (372), 4 states have internal predecessors, (372), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:21,418 INFO L186 Difference]: Start difference. First operand has 89 places, 86 transitions, 182 flow. Second operand 3 states and 229 transitions. [2022-07-19 21:05:21,418 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 91 places, 108 transitions, 329 flow [2022-07-19 21:05:21,419 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 91 places, 108 transitions, 329 flow, removed 0 selfloop flow, removed 0 redundant places. [2022-07-19 21:05:21,420 INFO L242 Difference]: Finished difference. Result has 93 places, 92 transitions, 236 flow [2022-07-19 21:05:21,420 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=93, PETRI_DIFFERENCE_MINUEND_FLOW=182, PETRI_DIFFERENCE_MINUEND_PLACES=89, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=86, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=80, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=236, PETRI_PLACES=93, PETRI_TRANSITIONS=92} [2022-07-19 21:05:21,421 INFO L279 CegarLoopForPetriNet]: 91 programPoint places, 2 predicate places. [2022-07-19 21:05:21,421 INFO L495 AbstractCegarLoop]: Abstraction has has 93 places, 92 transitions, 236 flow [2022-07-19 21:05:21,421 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 61.0) internal successors, (183), 3 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:21,422 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-19 21:05:21,422 INFO L200 CegarLoopForPetriNet]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-19 21:05:21,422 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-07-19 21:05:21,422 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 2 more)] === [2022-07-19 21:05:21,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-19 21:05:21,423 INFO L85 PathProgramCache]: Analyzing trace with hash -767453885, now seen corresponding path program 1 times [2022-07-19 21:05:21,423 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-19 21:05:21,423 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1666472859] [2022-07-19 21:05:21,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-19 21:05:21,423 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-19 21:05:21,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-19 21:05:21,435 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-07-19 21:05:21,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-19 21:05:21,445 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-07-19 21:05:21,445 INFO L271 BasicCegarLoop]: Counterexample is feasible [2022-07-19 21:05:21,445 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (4 of 5 remaining) [2022-07-19 21:05:21,446 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err0ASSERT_VIOLATIONERROR_FUNCTION (3 of 5 remaining) [2022-07-19 21:05:21,446 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (2 of 5 remaining) [2022-07-19 21:05:21,446 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err0ASSERT_VIOLATIONERROR_FUNCTION (1 of 5 remaining) [2022-07-19 21:05:21,446 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err0ASSERT_VIOLATIONERROR_FUNCTION (0 of 5 remaining) [2022-07-19 21:05:21,446 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-07-19 21:05:21,446 INFO L356 BasicCegarLoop]: Path program histogram: [1, 1, 1] [2022-07-19 21:05:21,447 WARN L231 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2022-07-19 21:05:21,447 INFO L509 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2022-07-19 21:05:21,462 INFO L135 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2022-07-19 21:05:21,464 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 109 places, 111 transitions, 243 flow [2022-07-19 21:05:21,478 INFO L129 PetriNetUnfolder]: 18/229 cut-off events. [2022-07-19 21:05:21,478 INFO L130 PetriNetUnfolder]: For 7/7 co-relation queries the response was YES. [2022-07-19 21:05:21,479 INFO L84 FinitePrefix]: Finished finitePrefix Result has 245 conditions, 229 events. 18/229 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 673 event pairs, 0 based on Foata normal form. 0/200 useless extension candidates. Maximal degree in co-relation 175. Up to 8 conditions per place. [2022-07-19 21:05:21,479 INFO L82 GeneralOperation]: Start removeDead. Operand has 109 places, 111 transitions, 243 flow [2022-07-19 21:05:21,480 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 109 places, 111 transitions, 243 flow [2022-07-19 21:05:21,481 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-19 21:05:21,482 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@4b7a9a2a, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@51bcb28b [2022-07-19 21:05:21,482 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2022-07-19 21:05:21,485 INFO L129 PetriNetUnfolder]: 5/57 cut-off events. [2022-07-19 21:05:21,485 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2022-07-19 21:05:21,485 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-19 21:05:21,485 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-19 21:05:21,485 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 3 more)] === [2022-07-19 21:05:21,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-19 21:05:21,486 INFO L85 PathProgramCache]: Analyzing trace with hash 1301976178, now seen corresponding path program 1 times [2022-07-19 21:05:21,486 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-19 21:05:21,486 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [259530018] [2022-07-19 21:05:21,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-19 21:05:21,487 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-19 21:05:21,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-19 21:05:21,498 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-19 21:05:21,498 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-19 21:05:21,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [259530018] [2022-07-19 21:05:21,498 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [259530018] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-19 21:05:21,498 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-19 21:05:21,498 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-19 21:05:21,499 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690049967] [2022-07-19 21:05:21,499 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-19 21:05:21,499 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-07-19 21:05:21,499 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-19 21:05:21,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-07-19 21:05:21,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-07-19 21:05:21,500 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 83 out of 111 [2022-07-19 21:05:21,501 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 109 places, 111 transitions, 243 flow. Second operand has 2 states, 2 states have (on average 84.5) internal successors, (169), 2 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:21,501 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-19 21:05:21,501 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 83 of 111 [2022-07-19 21:05:21,501 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-19 21:05:21,724 INFO L129 PetriNetUnfolder]: 934/2503 cut-off events. [2022-07-19 21:05:21,724 INFO L130 PetriNetUnfolder]: For 112/112 co-relation queries the response was YES. [2022-07-19 21:05:21,730 INFO L84 FinitePrefix]: Finished finitePrefix Result has 3862 conditions, 2503 events. 934/2503 cut-off events. For 112/112 co-relation queries the response was YES. Maximal size of possible extension queue 124. Compared 18740 event pairs, 621 based on Foata normal form. 389/2398 useless extension candidates. Maximal degree in co-relation 2905. Up to 1274 conditions per place. [2022-07-19 21:05:21,741 INFO L132 encePairwiseOnDemand]: 106/111 looper letters, 19 selfloop transitions, 0 changer transitions 0/102 dead transitions. [2022-07-19 21:05:21,741 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 106 places, 102 transitions, 263 flow [2022-07-19 21:05:21,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-07-19 21:05:21,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2022-07-19 21:05:21,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 190 transitions. [2022-07-19 21:05:21,742 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.8558558558558559 [2022-07-19 21:05:21,743 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 190 transitions. [2022-07-19 21:05:21,743 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 190 transitions. [2022-07-19 21:05:21,743 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-19 21:05:21,743 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 190 transitions. [2022-07-19 21:05:21,744 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 95.0) internal successors, (190), 2 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:21,744 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 111.0) internal successors, (333), 3 states have internal predecessors, (333), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:21,744 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 111.0) internal successors, (333), 3 states have internal predecessors, (333), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:21,744 INFO L186 Difference]: Start difference. First operand has 109 places, 111 transitions, 243 flow. Second operand 2 states and 190 transitions. [2022-07-19 21:05:21,745 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 106 places, 102 transitions, 263 flow [2022-07-19 21:05:21,746 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 106 places, 102 transitions, 257 flow, removed 3 selfloop flow, removed 0 redundant places. [2022-07-19 21:05:21,747 INFO L242 Difference]: Finished difference. Result has 106 places, 102 transitions, 219 flow [2022-07-19 21:05:21,747 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=111, PETRI_DIFFERENCE_MINUEND_FLOW=219, PETRI_DIFFERENCE_MINUEND_PLACES=105, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=102, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=102, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=219, PETRI_PLACES=106, PETRI_TRANSITIONS=102} [2022-07-19 21:05:21,748 INFO L279 CegarLoopForPetriNet]: 109 programPoint places, -3 predicate places. [2022-07-19 21:05:21,748 INFO L495 AbstractCegarLoop]: Abstraction has has 106 places, 102 transitions, 219 flow [2022-07-19 21:05:21,748 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 84.5) internal successors, (169), 2 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:21,748 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-19 21:05:21,748 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-19 21:05:21,748 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-07-19 21:05:21,749 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 3 more)] === [2022-07-19 21:05:21,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-19 21:05:21,749 INFO L85 PathProgramCache]: Analyzing trace with hash 919134927, now seen corresponding path program 1 times [2022-07-19 21:05:21,749 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-19 21:05:21,749 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1059547617] [2022-07-19 21:05:21,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-19 21:05:21,750 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-19 21:05:21,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-19 21:05:21,773 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-19 21:05:21,773 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-19 21:05:21,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1059547617] [2022-07-19 21:05:21,773 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1059547617] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-19 21:05:21,774 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-19 21:05:21,774 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-19 21:05:21,774 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567589813] [2022-07-19 21:05:21,774 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-19 21:05:21,774 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-19 21:05:21,774 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-19 21:05:21,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-19 21:05:21,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-19 21:05:21,775 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 66 out of 111 [2022-07-19 21:05:21,776 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 106 places, 102 transitions, 219 flow. Second operand has 3 states, 3 states have (on average 67.66666666666667) internal successors, (203), 3 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:21,776 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-19 21:05:21,776 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 66 of 111 [2022-07-19 21:05:21,776 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-19 21:05:23,602 INFO L129 PetriNetUnfolder]: 15145/26404 cut-off events. [2022-07-19 21:05:23,602 INFO L130 PetriNetUnfolder]: For 205/205 co-relation queries the response was YES. [2022-07-19 21:05:23,664 INFO L84 FinitePrefix]: Finished finitePrefix Result has 47580 conditions, 26404 events. 15145/26404 cut-off events. For 205/205 co-relation queries the response was YES. Maximal size of possible extension queue 1170. Compared 223666 event pairs, 5877 based on Foata normal form. 0/22557 useless extension candidates. Maximal degree in co-relation 47574. Up to 12218 conditions per place. [2022-07-19 21:05:23,834 INFO L132 encePairwiseOnDemand]: 99/111 looper letters, 58 selfloop transitions, 8 changer transitions 0/132 dead transitions. [2022-07-19 21:05:23,834 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 108 places, 132 transitions, 421 flow [2022-07-19 21:05:23,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-19 21:05:23,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2022-07-19 21:05:23,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 268 transitions. [2022-07-19 21:05:23,836 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.8048048048048048 [2022-07-19 21:05:23,836 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 268 transitions. [2022-07-19 21:05:23,836 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 268 transitions. [2022-07-19 21:05:23,836 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-19 21:05:23,836 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 268 transitions. [2022-07-19 21:05:23,837 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 89.33333333333333) internal successors, (268), 3 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:23,837 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 111.0) internal successors, (444), 4 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:23,838 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 111.0) internal successors, (444), 4 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:23,838 INFO L186 Difference]: Start difference. First operand has 106 places, 102 transitions, 219 flow. Second operand 3 states and 268 transitions. [2022-07-19 21:05:23,838 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 108 places, 132 transitions, 421 flow [2022-07-19 21:05:23,839 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 108 places, 132 transitions, 421 flow, removed 0 selfloop flow, removed 0 redundant places. [2022-07-19 21:05:23,841 INFO L242 Difference]: Finished difference. Result has 110 places, 110 transitions, 291 flow [2022-07-19 21:05:23,841 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=111, PETRI_DIFFERENCE_MINUEND_FLOW=219, PETRI_DIFFERENCE_MINUEND_PLACES=106, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=102, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=94, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=291, PETRI_PLACES=110, PETRI_TRANSITIONS=110} [2022-07-19 21:05:23,842 INFO L279 CegarLoopForPetriNet]: 109 programPoint places, 1 predicate places. [2022-07-19 21:05:23,842 INFO L495 AbstractCegarLoop]: Abstraction has has 110 places, 110 transitions, 291 flow [2022-07-19 21:05:23,842 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 67.66666666666667) internal successors, (203), 3 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:23,842 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-19 21:05:23,842 INFO L200 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-19 21:05:23,843 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-07-19 21:05:23,843 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting thr1Err0ASSERT_VIOLATIONERROR_FUNCTION === [thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 3 more)] === [2022-07-19 21:05:23,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-19 21:05:23,843 INFO L85 PathProgramCache]: Analyzing trace with hash -1474153519, now seen corresponding path program 1 times [2022-07-19 21:05:23,843 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-19 21:05:23,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [412308831] [2022-07-19 21:05:23,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-19 21:05:23,844 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-19 21:05:23,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-19 21:05:23,930 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-07-19 21:05:23,930 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-19 21:05:23,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [412308831] [2022-07-19 21:05:23,930 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [412308831] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-19 21:05:23,930 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-19 21:05:23,931 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-07-19 21:05:23,931 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [862435685] [2022-07-19 21:05:23,931 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-19 21:05:23,931 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-19 21:05:23,931 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-19 21:05:23,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-19 21:05:23,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-07-19 21:05:23,933 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 75 out of 111 [2022-07-19 21:05:23,933 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 110 places, 110 transitions, 291 flow. Second operand has 6 states, 6 states have (on average 76.83333333333333) internal successors, (461), 6 states have internal predecessors, (461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:23,933 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-19 21:05:23,933 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 75 of 111 [2022-07-19 21:05:23,933 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-19 21:05:25,019 INFO L129 PetriNetUnfolder]: 4513/11833 cut-off events. [2022-07-19 21:05:25,020 INFO L130 PetriNetUnfolder]: For 1409/1683 co-relation queries the response was YES. [2022-07-19 21:05:25,049 INFO L84 FinitePrefix]: Finished finitePrefix Result has 21126 conditions, 11833 events. 4513/11833 cut-off events. For 1409/1683 co-relation queries the response was YES. Maximal size of possible extension queue 606. Compared 124329 event pairs, 970 based on Foata normal form. 0/10498 useless extension candidates. Maximal degree in co-relation 21118. Up to 3938 conditions per place. [2022-07-19 21:05:25,087 INFO L132 encePairwiseOnDemand]: 99/111 looper letters, 64 selfloop transitions, 25 changer transitions 0/172 dead transitions. [2022-07-19 21:05:25,088 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 115 places, 172 transitions, 623 flow [2022-07-19 21:05:25,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-19 21:05:25,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2022-07-19 21:05:25,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 540 transitions. [2022-07-19 21:05:25,089 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.8108108108108109 [2022-07-19 21:05:25,090 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 540 transitions. [2022-07-19 21:05:25,090 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 540 transitions. [2022-07-19 21:05:25,090 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-19 21:05:25,090 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 540 transitions. [2022-07-19 21:05:25,091 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 90.0) internal successors, (540), 6 states have internal predecessors, (540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:25,093 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 111.0) internal successors, (777), 7 states have internal predecessors, (777), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:25,093 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 111.0) internal successors, (777), 7 states have internal predecessors, (777), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:25,093 INFO L186 Difference]: Start difference. First operand has 110 places, 110 transitions, 291 flow. Second operand 6 states and 540 transitions. [2022-07-19 21:05:25,093 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 115 places, 172 transitions, 623 flow [2022-07-19 21:05:25,102 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 113 places, 172 transitions, 607 flow, removed 0 selfloop flow, removed 2 redundant places. [2022-07-19 21:05:25,104 INFO L242 Difference]: Finished difference. Result has 116 places, 136 transitions, 430 flow [2022-07-19 21:05:25,104 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=111, PETRI_DIFFERENCE_MINUEND_FLOW=275, PETRI_DIFFERENCE_MINUEND_PLACES=108, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=110, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=9, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=99, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=430, PETRI_PLACES=116, PETRI_TRANSITIONS=136} [2022-07-19 21:05:25,105 INFO L279 CegarLoopForPetriNet]: 109 programPoint places, 7 predicate places. [2022-07-19 21:05:25,105 INFO L495 AbstractCegarLoop]: Abstraction has has 116 places, 136 transitions, 430 flow [2022-07-19 21:05:25,106 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 76.83333333333333) internal successors, (461), 6 states have internal predecessors, (461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:25,106 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-19 21:05:25,106 INFO L200 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-19 21:05:25,106 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-07-19 21:05:25,106 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting thr1Err0ASSERT_VIOLATIONERROR_FUNCTION === [thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 3 more)] === [2022-07-19 21:05:25,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-19 21:05:25,107 INFO L85 PathProgramCache]: Analyzing trace with hash 1514298013, now seen corresponding path program 2 times [2022-07-19 21:05:25,107 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-19 21:05:25,107 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [396398666] [2022-07-19 21:05:25,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-19 21:05:25,107 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-19 21:05:25,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-19 21:05:25,233 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-07-19 21:05:25,234 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-19 21:05:25,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [396398666] [2022-07-19 21:05:25,235 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [396398666] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-19 21:05:25,235 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-19 21:05:25,235 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-07-19 21:05:25,235 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239381353] [2022-07-19 21:05:25,235 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-19 21:05:25,236 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-19 21:05:25,236 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-19 21:05:25,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-19 21:05:25,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-07-19 21:05:25,238 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 74 out of 111 [2022-07-19 21:05:25,238 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 116 places, 136 transitions, 430 flow. Second operand has 6 states, 6 states have (on average 76.0) internal successors, (456), 6 states have internal predecessors, (456), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:25,240 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-19 21:05:25,241 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 74 of 111 [2022-07-19 21:05:25,241 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-19 21:05:26,231 INFO L129 PetriNetUnfolder]: 4742/12800 cut-off events. [2022-07-19 21:05:26,232 INFO L130 PetriNetUnfolder]: For 2448/3178 co-relation queries the response was YES. [2022-07-19 21:05:26,269 INFO L84 FinitePrefix]: Finished finitePrefix Result has 24060 conditions, 12800 events. 4742/12800 cut-off events. For 2448/3178 co-relation queries the response was YES. Maximal size of possible extension queue 651. Compared 136945 event pairs, 1174 based on Foata normal form. 302/12054 useless extension candidates. Maximal degree in co-relation 24049. Up to 3843 conditions per place. [2022-07-19 21:05:26,371 INFO L132 encePairwiseOnDemand]: 100/111 looper letters, 71 selfloop transitions, 27 changer transitions 0/180 dead transitions. [2022-07-19 21:05:26,371 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 121 places, 180 transitions, 769 flow [2022-07-19 21:05:26,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-19 21:05:26,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2022-07-19 21:05:26,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 536 transitions. [2022-07-19 21:05:26,373 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.8048048048048048 [2022-07-19 21:05:26,373 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 536 transitions. [2022-07-19 21:05:26,373 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 536 transitions. [2022-07-19 21:05:26,374 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-19 21:05:26,374 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 536 transitions. [2022-07-19 21:05:26,374 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 89.33333333333333) internal successors, (536), 6 states have internal predecessors, (536), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:26,375 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 111.0) internal successors, (777), 7 states have internal predecessors, (777), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:26,375 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 111.0) internal successors, (777), 7 states have internal predecessors, (777), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:26,376 INFO L186 Difference]: Start difference. First operand has 116 places, 136 transitions, 430 flow. Second operand 6 states and 536 transitions. [2022-07-19 21:05:26,376 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 121 places, 180 transitions, 769 flow [2022-07-19 21:05:26,378 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 121 places, 180 transitions, 769 flow, removed 0 selfloop flow, removed 0 redundant places. [2022-07-19 21:05:26,380 INFO L242 Difference]: Finished difference. Result has 122 places, 142 transitions, 525 flow [2022-07-19 21:05:26,380 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=111, PETRI_DIFFERENCE_MINUEND_FLOW=430, PETRI_DIFFERENCE_MINUEND_PLACES=116, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=136, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=21, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=112, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=525, PETRI_PLACES=122, PETRI_TRANSITIONS=142} [2022-07-19 21:05:26,382 INFO L279 CegarLoopForPetriNet]: 109 programPoint places, 13 predicate places. [2022-07-19 21:05:26,382 INFO L495 AbstractCegarLoop]: Abstraction has has 122 places, 142 transitions, 525 flow [2022-07-19 21:05:26,382 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 76.0) internal successors, (456), 6 states have internal predecessors, (456), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:26,382 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-19 21:05:26,382 INFO L200 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-19 21:05:26,382 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-07-19 21:05:26,383 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting thr1Err0ASSERT_VIOLATIONERROR_FUNCTION === [thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 3 more)] === [2022-07-19 21:05:26,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-19 21:05:26,383 INFO L85 PathProgramCache]: Analyzing trace with hash -692684284, now seen corresponding path program 1 times [2022-07-19 21:05:26,383 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-19 21:05:26,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1768463784] [2022-07-19 21:05:26,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-19 21:05:26,383 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-19 21:05:26,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-19 21:05:26,611 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-07-19 21:05:26,611 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-19 21:05:26,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1768463784] [2022-07-19 21:05:26,611 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1768463784] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-19 21:05:26,611 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-19 21:05:26,611 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-07-19 21:05:26,612 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316030251] [2022-07-19 21:05:26,612 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-19 21:05:26,612 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-19 21:05:26,612 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-19 21:05:26,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-19 21:05:26,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-07-19 21:05:26,613 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 75 out of 111 [2022-07-19 21:05:26,613 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 122 places, 142 transitions, 525 flow. Second operand has 6 states, 6 states have (on average 77.0) internal successors, (462), 6 states have internal predecessors, (462), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:26,613 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-19 21:05:26,613 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 75 of 111 [2022-07-19 21:05:26,613 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-19 21:05:27,565 INFO L129 PetriNetUnfolder]: 4388/11059 cut-off events. [2022-07-19 21:05:27,566 INFO L130 PetriNetUnfolder]: For 4744/7099 co-relation queries the response was YES. [2022-07-19 21:05:27,612 INFO L84 FinitePrefix]: Finished finitePrefix Result has 22669 conditions, 11059 events. 4388/11059 cut-off events. For 4744/7099 co-relation queries the response was YES. Maximal size of possible extension queue 593. Compared 112999 event pairs, 744 based on Foata normal form. 360/10662 useless extension candidates. Maximal degree in co-relation 22656. Up to 3774 conditions per place. [2022-07-19 21:05:27,735 INFO L132 encePairwiseOnDemand]: 99/111 looper letters, 71 selfloop transitions, 31 changer transitions 0/185 dead transitions. [2022-07-19 21:05:27,736 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 127 places, 185 transitions, 895 flow [2022-07-19 21:05:27,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-19 21:05:27,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2022-07-19 21:05:27,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 540 transitions. [2022-07-19 21:05:27,737 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.8108108108108109 [2022-07-19 21:05:27,737 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 540 transitions. [2022-07-19 21:05:27,737 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 540 transitions. [2022-07-19 21:05:27,738 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-19 21:05:27,738 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 540 transitions. [2022-07-19 21:05:27,739 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 90.0) internal successors, (540), 6 states have internal predecessors, (540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:27,740 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 111.0) internal successors, (777), 7 states have internal predecessors, (777), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:27,740 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 111.0) internal successors, (777), 7 states have internal predecessors, (777), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:27,740 INFO L186 Difference]: Start difference. First operand has 122 places, 142 transitions, 525 flow. Second operand 6 states and 540 transitions. [2022-07-19 21:05:27,740 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 127 places, 185 transitions, 895 flow [2022-07-19 21:05:27,743 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 124 places, 185 transitions, 852 flow, removed 4 selfloop flow, removed 3 redundant places. [2022-07-19 21:05:27,744 INFO L242 Difference]: Finished difference. Result has 125 places, 149 transitions, 602 flow [2022-07-19 21:05:27,745 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=111, PETRI_DIFFERENCE_MINUEND_FLOW=485, PETRI_DIFFERENCE_MINUEND_PLACES=119, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=142, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=24, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=114, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=602, PETRI_PLACES=125, PETRI_TRANSITIONS=149} [2022-07-19 21:05:27,745 INFO L279 CegarLoopForPetriNet]: 109 programPoint places, 16 predicate places. [2022-07-19 21:05:27,745 INFO L495 AbstractCegarLoop]: Abstraction has has 125 places, 149 transitions, 602 flow [2022-07-19 21:05:27,745 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 77.0) internal successors, (462), 6 states have internal predecessors, (462), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:27,746 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-19 21:05:27,746 INFO L200 CegarLoopForPetriNet]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-19 21:05:27,746 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-07-19 21:05:27,746 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 3 more)] === [2022-07-19 21:05:27,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-19 21:05:27,746 INFO L85 PathProgramCache]: Analyzing trace with hash -1878497531, now seen corresponding path program 1 times [2022-07-19 21:05:27,746 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-19 21:05:27,746 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724854774] [2022-07-19 21:05:27,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-19 21:05:27,746 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-19 21:05:27,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-19 21:05:27,755 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-07-19 21:05:27,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-19 21:05:27,778 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-07-19 21:05:27,778 INFO L271 BasicCegarLoop]: Counterexample is feasible [2022-07-19 21:05:27,778 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (5 of 6 remaining) [2022-07-19 21:05:27,779 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err0ASSERT_VIOLATIONERROR_FUNCTION (4 of 6 remaining) [2022-07-19 21:05:27,779 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (3 of 6 remaining) [2022-07-19 21:05:27,779 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err0ASSERT_VIOLATIONERROR_FUNCTION (2 of 6 remaining) [2022-07-19 21:05:27,779 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err0ASSERT_VIOLATIONERROR_FUNCTION (1 of 6 remaining) [2022-07-19 21:05:27,779 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thr1Err0ASSERT_VIOLATIONERROR_FUNCTION (0 of 6 remaining) [2022-07-19 21:05:27,779 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-07-19 21:05:27,779 INFO L356 BasicCegarLoop]: Path program histogram: [2, 1, 1, 1, 1] [2022-07-19 21:05:27,780 WARN L231 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2022-07-19 21:05:27,780 INFO L509 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2022-07-19 21:05:27,795 INFO L135 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2022-07-19 21:05:27,797 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 127 places, 129 transitions, 290 flow [2022-07-19 21:05:27,810 INFO L129 PetriNetUnfolder]: 23/287 cut-off events. [2022-07-19 21:05:27,810 INFO L130 PetriNetUnfolder]: For 16/16 co-relation queries the response was YES. [2022-07-19 21:05:27,811 INFO L84 FinitePrefix]: Finished finitePrefix Result has 310 conditions, 287 events. 23/287 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 900 event pairs, 0 based on Foata normal form. 0/250 useless extension candidates. Maximal degree in co-relation 237. Up to 10 conditions per place. [2022-07-19 21:05:27,811 INFO L82 GeneralOperation]: Start removeDead. Operand has 127 places, 129 transitions, 290 flow [2022-07-19 21:05:27,812 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 127 places, 129 transitions, 290 flow [2022-07-19 21:05:27,813 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-19 21:05:27,813 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@4b7a9a2a, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@51bcb28b [2022-07-19 21:05:27,813 INFO L358 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2022-07-19 21:05:27,815 INFO L129 PetriNetUnfolder]: 4/54 cut-off events. [2022-07-19 21:05:27,815 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2022-07-19 21:05:27,815 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-19 21:05:27,815 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-19 21:05:27,815 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 4 more)] === [2022-07-19 21:05:27,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-19 21:05:27,815 INFO L85 PathProgramCache]: Analyzing trace with hash 846339634, now seen corresponding path program 1 times [2022-07-19 21:05:27,815 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-19 21:05:27,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [691145282] [2022-07-19 21:05:27,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-19 21:05:27,815 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-19 21:05:27,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-19 21:05:27,823 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-19 21:05:27,823 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-19 21:05:27,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [691145282] [2022-07-19 21:05:27,824 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [691145282] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-19 21:05:27,824 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-19 21:05:27,824 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-19 21:05:27,824 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437593115] [2022-07-19 21:05:27,824 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-19 21:05:27,824 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-07-19 21:05:27,824 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-19 21:05:27,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-07-19 21:05:27,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-07-19 21:05:27,825 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 94 out of 129 [2022-07-19 21:05:27,825 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 127 places, 129 transitions, 290 flow. Second operand has 2 states, 2 states have (on average 95.5) internal successors, (191), 2 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:27,825 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-19 21:05:27,825 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 94 of 129 [2022-07-19 21:05:27,825 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-07-19 21:05:28,553 INFO L129 PetriNetUnfolder]: 5094/11052 cut-off events. [2022-07-19 21:05:28,554 INFO L130 PetriNetUnfolder]: For 755/755 co-relation queries the response was YES. [2022-07-19 21:05:28,602 INFO L84 FinitePrefix]: Finished finitePrefix Result has 17917 conditions, 11052 events. 5094/11052 cut-off events. For 755/755 co-relation queries the response was YES. Maximal size of possible extension queue 478. Compared 98251 event pairs, 3501 based on Foata normal form. 1903/10728 useless extension candidates. Maximal degree in co-relation 13563. Up to 6458 conditions per place. [2022-07-19 21:05:28,647 INFO L132 encePairwiseOnDemand]: 123/129 looper letters, 24 selfloop transitions, 0 changer transitions 0/118 dead transitions. [2022-07-19 21:05:28,648 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 123 places, 118 transitions, 316 flow [2022-07-19 21:05:28,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-07-19 21:05:28,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2022-07-19 21:05:28,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 218 transitions. [2022-07-19 21:05:28,649 INFO L488 CegarLoopForPetriNet]: DFA transition density 0.8449612403100775 [2022-07-19 21:05:28,649 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 218 transitions. [2022-07-19 21:05:28,649 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 218 transitions. [2022-07-19 21:05:28,649 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-19 21:05:28,649 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 218 transitions. [2022-07-19 21:05:28,650 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 109.0) internal successors, (218), 2 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:28,650 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 129.0) internal successors, (387), 3 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:28,650 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 129.0) internal successors, (387), 3 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:28,650 INFO L186 Difference]: Start difference. First operand has 127 places, 129 transitions, 290 flow. Second operand 2 states and 218 transitions. [2022-07-19 21:05:28,650 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 123 places, 118 transitions, 316 flow [2022-07-19 21:05:28,651 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 123 places, 118 transitions, 304 flow, removed 6 selfloop flow, removed 0 redundant places. [2022-07-19 21:05:28,652 INFO L242 Difference]: Finished difference. Result has 123 places, 118 transitions, 256 flow [2022-07-19 21:05:28,652 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=129, PETRI_DIFFERENCE_MINUEND_FLOW=256, PETRI_DIFFERENCE_MINUEND_PLACES=122, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=118, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=118, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=256, PETRI_PLACES=123, PETRI_TRANSITIONS=118} [2022-07-19 21:05:28,652 INFO L279 CegarLoopForPetriNet]: 127 programPoint places, -4 predicate places. [2022-07-19 21:05:28,653 INFO L495 AbstractCegarLoop]: Abstraction has has 123 places, 118 transitions, 256 flow [2022-07-19 21:05:28,653 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 95.5) internal successors, (191), 2 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:28,653 INFO L192 CegarLoopForPetriNet]: Found error trace [2022-07-19 21:05:28,653 INFO L200 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-19 21:05:28,653 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-07-19 21:05:28,653 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting thr1Err0ASSERT_VIOLATIONERROR_FUNCTION === [thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 4 more)] === [2022-07-19 21:05:28,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-19 21:05:28,653 INFO L85 PathProgramCache]: Analyzing trace with hash 1713017780, now seen corresponding path program 1 times [2022-07-19 21:05:28,654 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-19 21:05:28,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351754155] [2022-07-19 21:05:28,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-19 21:05:28,654 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-19 21:05:28,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-19 21:05:28,677 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-19 21:05:28,677 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-19 21:05:28,677 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [351754155] [2022-07-19 21:05:28,677 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [351754155] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-19 21:05:28,677 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-19 21:05:28,677 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-19 21:05:28,677 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169821312] [2022-07-19 21:05:28,677 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-19 21:05:28,677 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-19 21:05:28,678 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-19 21:05:28,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-19 21:05:28,678 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-19 21:05:28,678 INFO L443 CegarLoopForPetriNet]: Number of universal loopers: 73 out of 129 [2022-07-19 21:05:28,678 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 123 places, 118 transitions, 256 flow. Second operand has 3 states, 3 states have (on average 75.0) internal successors, (225), 3 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-19 21:05:28,679 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-07-19 21:05:28,679 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 73 of 129 [2022-07-19 21:05:28,679 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand