./Ultimate.py --spec ../../../trunk/examples/svcomp/properties/valid-memsafety.prp --file ../../../trunk/examples/svcomp/goblint-regression/28-race_reach_36-indirect_racefree.i --full-output --traceabstraction.when.to.check.the.insufficient.erros.location.relative.to.the.other.error.locations AFTER --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version b8dbc81d Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerMemDerefMemtrack.xml -i ../../../trunk/examples/svcomp/goblint-regression/28-race_reach_36-indirect_racefree.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-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 valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 3eff698bae51c39e8a3a4c763800dbda831dabb73a169fa31c8e326faee47cd8 --traceabstraction.when.to.check.the.insufficient.erros.location.relative.to.the.other.error.locations AFTER --- Real Ultimate output --- This is Ultimate 0.2.3-?-b8dbc81 [2023-08-29 21:43:37,550 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-08-29 21:43:37,552 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-08-29 21:43:37,588 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-08-29 21:43:37,596 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-08-29 21:43:37,600 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-08-29 21:43:37,603 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-08-29 21:43:37,605 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-08-29 21:43:37,607 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-08-29 21:43:37,611 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-08-29 21:43:37,612 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-08-29 21:43:37,613 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-08-29 21:43:37,615 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-08-29 21:43:37,616 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-08-29 21:43:37,617 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-08-29 21:43:37,620 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-08-29 21:43:37,620 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-08-29 21:43:37,621 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-08-29 21:43:37,623 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-08-29 21:43:37,625 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-08-29 21:43:37,628 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-08-29 21:43:37,632 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-08-29 21:43:37,632 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-08-29 21:43:37,633 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-08-29 21:43:37,638 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-08-29 21:43:37,641 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-08-29 21:43:37,642 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-08-29 21:43:37,643 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-08-29 21:43:37,644 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-08-29 21:43:37,644 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-08-29 21:43:37,645 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-08-29 21:43:37,648 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-08-29 21:43:37,648 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-08-29 21:43:37,649 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-08-29 21:43:37,650 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-08-29 21:43:37,651 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-08-29 21:43:37,652 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-08-29 21:43:37,652 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-08-29 21:43:37,652 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-08-29 21:43:37,653 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-08-29 21:43:37,653 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-08-29 21:43:37,655 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2023-08-29 21:43:37,687 INFO L113 SettingsManager]: Loading preferences was successful [2023-08-29 21:43:37,687 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-29 21:43:37,688 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-08-29 21:43:37,688 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-08-29 21:43:37,689 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-29 21:43:37,689 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-29 21:43:37,690 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-29 21:43:37,690 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2023-08-29 21:43:37,690 INFO L138 SettingsManager]: * Use SBE=true [2023-08-29 21:43:37,690 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-29 21:43:37,691 INFO L138 SettingsManager]: * sizeof long=4 [2023-08-29 21:43:37,691 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2023-08-29 21:43:37,691 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-29 21:43:37,691 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-08-29 21:43:37,692 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-08-29 21:43:37,692 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-08-29 21:43:37,692 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2023-08-29 21:43:37,692 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-08-29 21:43:37,692 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-29 21:43:37,692 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-08-29 21:43:37,693 INFO L138 SettingsManager]: * sizeof long double=12 [2023-08-29 21:43:37,693 INFO L138 SettingsManager]: * Use constant arrays=true [2023-08-29 21:43:37,693 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-29 21:43:37,693 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-29 21:43:37,693 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-29 21:43:37,694 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-29 21:43:37,694 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-29 21:43:37,694 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-29 21:43:37,694 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-29 21:43:37,694 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-29 21:43:37,694 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-29 21:43:37,695 INFO L138 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-08-29 21:43:37,695 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-29 21:43:37,695 INFO L138 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-08-29 21:43:37,695 INFO L138 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 3eff698bae51c39e8a3a4c763800dbda831dabb73a169fa31c8e326faee47cd8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: When to check the insufficient erros location relative to the other error locations -> AFTER [2023-08-29 21:43:37,978 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-29 21:43:37,993 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-29 21:43:37,996 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-29 21:43:37,997 INFO L271 PluginConnector]: Initializing CDTParser... [2023-08-29 21:43:37,997 INFO L275 PluginConnector]: CDTParser initialized [2023-08-29 21:43:37,999 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_36-indirect_racefree.i [2023-08-29 21:43:39,106 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-08-29 21:43:39,373 INFO L351 CDTParser]: Found 1 translation units. [2023-08-29 21:43:39,373 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_36-indirect_racefree.i [2023-08-29 21:43:39,388 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fc5bc72e9/513eae9c2f6347f49139c1e173b73a27/FLAGfacc54878 [2023-08-29 21:43:39,410 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fc5bc72e9/513eae9c2f6347f49139c1e173b73a27 [2023-08-29 21:43:39,412 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-29 21:43:39,413 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2023-08-29 21:43:39,414 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-29 21:43:39,414 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-29 21:43:39,418 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-29 21:43:39,420 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.08 09:43:39" (1/1) ... [2023-08-29 21:43:39,421 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2dd12a97 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 09:43:39, skipping insertion in model container [2023-08-29 21:43:39,421 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.08 09:43:39" (1/1) ... [2023-08-29 21:43:39,426 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-08-29 21:43:39,472 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-08-29 21:43:39,803 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_36-indirect_racefree.i[30176,30189] [2023-08-29 21:43:39,826 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-29 21:43:39,840 INFO L203 MainTranslator]: Completed pre-run [2023-08-29 21:43:39,880 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_36-indirect_racefree.i[30176,30189] [2023-08-29 21:43:39,898 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-29 21:43:39,945 INFO L208 MainTranslator]: Completed translation [2023-08-29 21:43:39,946 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 09:43:39 WrapperNode [2023-08-29 21:43:39,946 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-29 21:43:39,947 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-29 21:43:39,948 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-29 21:43:39,948 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-29 21:43:39,954 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 09:43:39" (1/1) ... [2023-08-29 21:43:39,982 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 09:43:39" (1/1) ... [2023-08-29 21:43:40,012 INFO L138 Inliner]: procedures = 170, calls = 37, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 80 [2023-08-29 21:43:40,013 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-29 21:43:40,014 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-29 21:43:40,014 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-29 21:43:40,014 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-08-29 21:43:40,021 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 09:43:39" (1/1) ... [2023-08-29 21:43:40,022 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 09:43:39" (1/1) ... [2023-08-29 21:43:40,036 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 09:43:39" (1/1) ... [2023-08-29 21:43:40,036 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 09:43:39" (1/1) ... [2023-08-29 21:43:40,045 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 09:43:39" (1/1) ... [2023-08-29 21:43:40,052 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 09:43:39" (1/1) ... [2023-08-29 21:43:40,054 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 09:43:39" (1/1) ... [2023-08-29 21:43:40,062 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 09:43:39" (1/1) ... [2023-08-29 21:43:40,064 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-29 21:43:40,067 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-29 21:43:40,068 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-08-29 21:43:40,068 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-08-29 21:43:40,069 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 09:43:39" (1/1) ... [2023-08-29 21:43:40,076 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-29 21:43:40,087 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-29 21:43:40,102 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-08-29 21:43:40,130 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-08-29 21:43:40,143 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-29 21:43:40,144 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-29 21:43:40,144 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-08-29 21:43:40,144 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-29 21:43:40,144 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-29 21:43:40,144 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-08-29 21:43:40,144 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-08-29 21:43:40,145 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-29 21:43:40,145 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-29 21:43:40,145 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-29 21:43:40,145 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-29 21:43:40,147 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-08-29 21:43:40,342 INFO L236 CfgBuilder]: Building ICFG [2023-08-29 21:43:40,344 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-29 21:43:40,641 INFO L277 CfgBuilder]: Performing block encoding [2023-08-29 21:43:40,646 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-29 21:43:40,646 INFO L302 CfgBuilder]: Removed 10 assume(true) statements. [2023-08-29 21:43:40,649 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.08 09:43:40 BoogieIcfgContainer [2023-08-29 21:43:40,649 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-29 21:43:40,651 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-29 21:43:40,651 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-08-29 21:43:40,654 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-08-29 21:43:40,654 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 29.08 09:43:39" (1/3) ... [2023-08-29 21:43:40,655 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cd349f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.08 09:43:40, skipping insertion in model container [2023-08-29 21:43:40,655 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.08 09:43:39" (2/3) ... [2023-08-29 21:43:40,655 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cd349f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.08 09:43:40, skipping insertion in model container [2023-08-29 21:43:40,655 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.08 09:43:40" (3/3) ... [2023-08-29 21:43:40,657 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_36-indirect_racefree.i [2023-08-29 21:43:40,679 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-29 21:43:40,680 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 16 error locations. [2023-08-29 21:43:40,680 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-29 21:43:40,770 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-08-29 21:43:40,812 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 120 places, 129 transitions, 266 flow [2023-08-29 21:43:40,896 INFO L130 PetriNetUnfolder]: 17/173 cut-off events. [2023-08-29 21:43:40,897 INFO L131 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2023-08-29 21:43:40,903 INFO L83 FinitePrefix]: Finished finitePrefix Result has 179 conditions, 173 events. 17/173 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 516 event pairs, 0 based on Foata normal form. 0/129 useless extension candidates. Maximal degree in co-relation 89. Up to 4 conditions per place. [2023-08-29 21:43:40,903 INFO L82 GeneralOperation]: Start removeDead. Operand has 120 places, 129 transitions, 266 flow [2023-08-29 21:43:40,911 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 120 places, 129 transitions, 266 flow [2023-08-29 21:43:40,914 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-29 21:43:40,929 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 120 places, 129 transitions, 266 flow [2023-08-29 21:43:40,936 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 120 places, 129 transitions, 266 flow [2023-08-29 21:43:40,937 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 120 places, 129 transitions, 266 flow [2023-08-29 21:43:40,984 INFO L130 PetriNetUnfolder]: 17/173 cut-off events. [2023-08-29 21:43:40,987 INFO L131 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2023-08-29 21:43:40,988 INFO L83 FinitePrefix]: Finished finitePrefix Result has 179 conditions, 173 events. 17/173 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 516 event pairs, 0 based on Foata normal form. 0/129 useless extension candidates. Maximal degree in co-relation 89. Up to 4 conditions per place. [2023-08-29 21:43:40,992 INFO L119 LiptonReduction]: Number of co-enabled transitions 4000 [2023-08-29 21:43:44,530 INFO L134 LiptonReduction]: Checked pairs total: 8464 [2023-08-29 21:43:44,530 INFO L136 LiptonReduction]: Total number of compositions: 114 [2023-08-29 21:43:44,543 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-29 21:43:44,548 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=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@ff21c81, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-29 21:43:44,549 INFO L358 AbstractCegarLoop]: Starting to check reachability of 24 error locations. [2023-08-29 21:43:44,551 INFO L130 PetriNetUnfolder]: 0/2 cut-off events. [2023-08-29 21:43:44,552 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-29 21:43:44,552 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-29 21:43:44,552 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-29 21:43:44,553 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 21 more)] === [2023-08-29 21:43:44,557 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-29 21:43:44,557 INFO L85 PathProgramCache]: Analyzing trace with hash 15832, now seen corresponding path program 1 times [2023-08-29 21:43:44,565 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-29 21:43:44,565 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1251994007] [2023-08-29 21:43:44,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-29 21:43:44,566 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-29 21:43:44,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-29 21:43:44,864 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-29 21:43:44,864 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-29 21:43:44,865 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1251994007] [2023-08-29 21:43:44,865 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1251994007] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-29 21:43:44,866 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-29 21:43:44,866 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-29 21:43:44,874 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63034421] [2023-08-29 21:43:44,874 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-29 21:43:44,881 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-29 21:43:44,885 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-29 21:43:44,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-29 21:43:44,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-29 21:43:44,967 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 110 out of 243 [2023-08-29 21:43:44,970 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 43 places, 49 transitions, 106 flow. Second operand has 3 states, 3 states have (on average 110.66666666666667) internal successors, (332), 3 states have internal predecessors, (332), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:44,970 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-29 21:43:44,970 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 110 of 243 [2023-08-29 21:43:44,971 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-29 21:43:45,110 INFO L130 PetriNetUnfolder]: 204/492 cut-off events. [2023-08-29 21:43:45,110 INFO L131 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2023-08-29 21:43:45,114 INFO L83 FinitePrefix]: Finished finitePrefix Result has 950 conditions, 492 events. 204/492 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 39. Compared 2550 event pairs, 176 based on Foata normal form. 18/335 useless extension candidates. Maximal degree in co-relation 914. Up to 433 conditions per place. [2023-08-29 21:43:45,121 INFO L137 encePairwiseOnDemand]: 229/243 looper letters, 45 selfloop transitions, 2 changer transitions 0/53 dead transitions. [2023-08-29 21:43:45,122 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 43 places, 53 transitions, 208 flow [2023-08-29 21:43:45,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-29 21:43:45,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-29 21:43:45,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 397 transitions. [2023-08-29 21:43:45,140 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5445816186556928 [2023-08-29 21:43:45,141 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 397 transitions. [2023-08-29 21:43:45,141 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 397 transitions. [2023-08-29 21:43:45,144 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-29 21:43:45,147 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 397 transitions. [2023-08-29 21:43:45,152 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 132.33333333333334) internal successors, (397), 3 states have internal predecessors, (397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:45,158 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 243.0) internal successors, (972), 4 states have internal predecessors, (972), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:45,159 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 243.0) internal successors, (972), 4 states have internal predecessors, (972), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:45,161 INFO L175 Difference]: Start difference. First operand has 43 places, 49 transitions, 106 flow. Second operand 3 states and 397 transitions. [2023-08-29 21:43:45,162 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 43 places, 53 transitions, 208 flow [2023-08-29 21:43:45,166 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 43 places, 53 transitions, 208 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-29 21:43:45,168 INFO L231 Difference]: Finished difference. Result has 44 places, 39 transitions, 96 flow [2023-08-29 21:43:45,170 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=243, PETRI_DIFFERENCE_MINUEND_FLOW=86, PETRI_DIFFERENCE_MINUEND_PLACES=41, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=39, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=37, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=96, PETRI_PLACES=44, PETRI_TRANSITIONS=39} [2023-08-29 21:43:45,175 INFO L281 CegarLoopForPetriNet]: 43 programPoint places, 1 predicate places. [2023-08-29 21:43:45,176 INFO L495 AbstractCegarLoop]: Abstraction has has 44 places, 39 transitions, 96 flow [2023-08-29 21:43:45,176 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 110.66666666666667) internal successors, (332), 3 states have internal predecessors, (332), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:45,176 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-29 21:43:45,176 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-29 21:43:45,177 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-29 21:43:45,177 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 21 more)] === [2023-08-29 21:43:45,182 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-29 21:43:45,182 INFO L85 PathProgramCache]: Analyzing trace with hash 15833, now seen corresponding path program 1 times [2023-08-29 21:43:45,182 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-29 21:43:45,183 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [795352047] [2023-08-29 21:43:45,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-29 21:43:45,183 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-29 21:43:45,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-29 21:43:45,249 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-29 21:43:45,250 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-29 21:43:45,250 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [795352047] [2023-08-29 21:43:45,250 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [795352047] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-29 21:43:45,250 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-29 21:43:45,250 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-29 21:43:45,251 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1572003607] [2023-08-29 21:43:45,251 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-29 21:43:45,252 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-29 21:43:45,252 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-29 21:43:45,253 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-29 21:43:45,253 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-29 21:43:45,313 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 107 out of 243 [2023-08-29 21:43:45,314 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 44 places, 39 transitions, 96 flow. Second operand has 3 states, 3 states have (on average 107.66666666666667) internal successors, (323), 3 states have internal predecessors, (323), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:45,314 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-29 21:43:45,315 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 107 of 243 [2023-08-29 21:43:45,315 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-29 21:43:45,402 INFO L130 PetriNetUnfolder]: 180/434 cut-off events. [2023-08-29 21:43:45,402 INFO L131 PetriNetUnfolder]: For 25/25 co-relation queries the response was YES. [2023-08-29 21:43:45,403 INFO L83 FinitePrefix]: Finished finitePrefix Result has 892 conditions, 434 events. 180/434 cut-off events. For 25/25 co-relation queries the response was YES. Maximal size of possible extension queue 34. Compared 2190 event pairs, 156 based on Foata normal form. 0/301 useless extension candidates. Maximal degree in co-relation 863. Up to 344 conditions per place. [2023-08-29 21:43:45,406 INFO L137 encePairwiseOnDemand]: 238/243 looper letters, 40 selfloop transitions, 3 changer transitions 0/49 dead transitions. [2023-08-29 21:43:45,406 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 44 places, 49 transitions, 202 flow [2023-08-29 21:43:45,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-29 21:43:45,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-29 21:43:45,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 366 transitions. [2023-08-29 21:43:45,408 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5020576131687243 [2023-08-29 21:43:45,408 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 366 transitions. [2023-08-29 21:43:45,408 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 366 transitions. [2023-08-29 21:43:45,409 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-29 21:43:45,409 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 366 transitions. [2023-08-29 21:43:45,411 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 122.0) internal successors, (366), 3 states have internal predecessors, (366), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:45,413 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 243.0) internal successors, (972), 4 states have internal predecessors, (972), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:45,414 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 243.0) internal successors, (972), 4 states have internal predecessors, (972), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:45,414 INFO L175 Difference]: Start difference. First operand has 44 places, 39 transitions, 96 flow. Second operand 3 states and 366 transitions. [2023-08-29 21:43:45,414 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 44 places, 49 transitions, 202 flow [2023-08-29 21:43:45,416 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 42 places, 49 transitions, 198 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-29 21:43:45,417 INFO L231 Difference]: Finished difference. Result has 42 places, 37 transitions, 94 flow [2023-08-29 21:43:45,417 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=243, PETRI_DIFFERENCE_MINUEND_FLOW=88, PETRI_DIFFERENCE_MINUEND_PLACES=40, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=37, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=34, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=94, PETRI_PLACES=42, PETRI_TRANSITIONS=37} [2023-08-29 21:43:45,418 INFO L281 CegarLoopForPetriNet]: 43 programPoint places, -1 predicate places. [2023-08-29 21:43:45,418 INFO L495 AbstractCegarLoop]: Abstraction has has 42 places, 37 transitions, 94 flow [2023-08-29 21:43:45,419 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 107.66666666666667) internal successors, (323), 3 states have internal predecessors, (323), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:45,419 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-29 21:43:45,419 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-29 21:43:45,419 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-08-29 21:43:45,419 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 21 more)] === [2023-08-29 21:43:45,420 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-29 21:43:45,420 INFO L85 PathProgramCache]: Analyzing trace with hash 472062628, now seen corresponding path program 1 times [2023-08-29 21:43:45,420 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-29 21:43:45,421 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [863291840] [2023-08-29 21:43:45,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-29 21:43:45,421 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-29 21:43:45,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-29 21:43:45,559 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-29 21:43:45,559 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-29 21:43:45,560 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [863291840] [2023-08-29 21:43:45,560 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [863291840] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-29 21:43:45,560 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [637400072] [2023-08-29 21:43:45,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-29 21:43:45,560 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-29 21:43:45,561 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-29 21:43:45,563 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-29 21:43:45,570 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-08-29 21:43:45,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-29 21:43:45,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-29 21:43:45,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-08-29 21:43:45,749 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-29 21:43:45,818 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-29 21:43:45,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-08-29 21:43:45,878 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-29 21:43:45,878 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [637400072] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-29 21:43:45,878 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-29 21:43:45,879 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-29 21:43:45,879 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426126004] [2023-08-29 21:43:45,879 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-29 21:43:45,879 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-29 21:43:45,880 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-29 21:43:45,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-29 21:43:45,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-29 21:43:46,138 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 106 out of 243 [2023-08-29 21:43:46,139 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 42 places, 37 transitions, 94 flow. Second operand has 8 states, 8 states have (on average 107.875) internal successors, (863), 8 states have internal predecessors, (863), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:46,139 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-29 21:43:46,139 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 106 of 243 [2023-08-29 21:43:46,139 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-29 21:43:46,233 INFO L130 PetriNetUnfolder]: 24/79 cut-off events. [2023-08-29 21:43:46,233 INFO L131 PetriNetUnfolder]: For 11/11 co-relation queries the response was YES. [2023-08-29 21:43:46,233 INFO L83 FinitePrefix]: Finished finitePrefix Result has 169 conditions, 79 events. 24/79 cut-off events. For 11/11 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 212 event pairs, 11 based on Foata normal form. 13/85 useless extension candidates. Maximal degree in co-relation 161. Up to 50 conditions per place. [2023-08-29 21:43:46,234 INFO L137 encePairwiseOnDemand]: 239/243 looper letters, 21 selfloop transitions, 2 changer transitions 6/35 dead transitions. [2023-08-29 21:43:46,234 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 31 places, 35 transitions, 137 flow [2023-08-29 21:43:46,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-29 21:43:46,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-29 21:43:46,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 455 transitions. [2023-08-29 21:43:46,238 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.46810699588477367 [2023-08-29 21:43:46,238 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 455 transitions. [2023-08-29 21:43:46,238 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 455 transitions. [2023-08-29 21:43:46,239 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-29 21:43:46,239 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 455 transitions. [2023-08-29 21:43:46,240 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 113.75) internal successors, (455), 4 states have internal predecessors, (455), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:46,242 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 243.0) internal successors, (1215), 5 states have internal predecessors, (1215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:46,243 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 243.0) internal successors, (1215), 5 states have internal predecessors, (1215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:46,243 INFO L175 Difference]: Start difference. First operand has 42 places, 37 transitions, 94 flow. Second operand 4 states and 455 transitions. [2023-08-29 21:43:46,243 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 31 places, 35 transitions, 137 flow [2023-08-29 21:43:46,244 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 29 places, 35 transitions, 134 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-29 21:43:46,245 INFO L231 Difference]: Finished difference. Result has 29 places, 19 transitions, 48 flow [2023-08-29 21:43:46,246 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=243, PETRI_DIFFERENCE_MINUEND_FLOW=50, PETRI_DIFFERENCE_MINUEND_PLACES=26, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=22, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=20, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=48, PETRI_PLACES=29, PETRI_TRANSITIONS=19} [2023-08-29 21:43:46,246 INFO L281 CegarLoopForPetriNet]: 43 programPoint places, -14 predicate places. [2023-08-29 21:43:46,247 INFO L495 AbstractCegarLoop]: Abstraction has has 29 places, 19 transitions, 48 flow [2023-08-29 21:43:46,248 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 107.875) internal successors, (863), 8 states have internal predecessors, (863), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:46,248 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-29 21:43:46,248 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-29 21:43:46,256 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-08-29 21:43:46,453 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-29 21:43:46,453 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 21 more)] === [2023-08-29 21:43:46,454 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-29 21:43:46,454 INFO L85 PathProgramCache]: Analyzing trace with hash 1749023109, now seen corresponding path program 1 times [2023-08-29 21:43:46,454 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-29 21:43:46,455 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1213645892] [2023-08-29 21:43:46,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-29 21:43:46,455 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-29 21:43:46,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-29 21:43:46,645 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-29 21:43:46,646 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-29 21:43:46,646 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1213645892] [2023-08-29 21:43:46,647 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1213645892] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-29 21:43:46,647 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-29 21:43:46,647 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-29 21:43:46,647 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492355481] [2023-08-29 21:43:46,647 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-29 21:43:46,650 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-29 21:43:46,651 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-29 21:43:46,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-29 21:43:46,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-29 21:43:46,684 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 109 out of 243 [2023-08-29 21:43:46,685 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 29 places, 19 transitions, 48 flow. Second operand has 3 states, 3 states have (on average 110.66666666666667) internal successors, (332), 3 states have internal predecessors, (332), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:46,686 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-29 21:43:46,686 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 109 of 243 [2023-08-29 21:43:46,687 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-29 21:43:46,703 INFO L130 PetriNetUnfolder]: 14/56 cut-off events. [2023-08-29 21:43:46,707 INFO L131 PetriNetUnfolder]: For 7/7 co-relation queries the response was YES. [2023-08-29 21:43:46,708 INFO L83 FinitePrefix]: Finished finitePrefix Result has 113 conditions, 56 events. 14/56 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 124 event pairs, 14 based on Foata normal form. 3/56 useless extension candidates. Maximal degree in co-relation 105. Up to 40 conditions per place. [2023-08-29 21:43:46,708 INFO L137 encePairwiseOnDemand]: 240/243 looper letters, 10 selfloop transitions, 1 changer transitions 0/17 dead transitions. [2023-08-29 21:43:46,708 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 26 places, 17 transitions, 66 flow [2023-08-29 21:43:46,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-29 21:43:46,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-29 21:43:46,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 340 transitions. [2023-08-29 21:43:46,710 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4663923182441701 [2023-08-29 21:43:46,710 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 340 transitions. [2023-08-29 21:43:46,710 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 340 transitions. [2023-08-29 21:43:46,711 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-29 21:43:46,711 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 340 transitions. [2023-08-29 21:43:46,712 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 113.33333333333333) internal successors, (340), 3 states have internal predecessors, (340), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:46,713 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 243.0) internal successors, (972), 4 states have internal predecessors, (972), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:46,714 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 243.0) internal successors, (972), 4 states have internal predecessors, (972), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:46,714 INFO L175 Difference]: Start difference. First operand has 29 places, 19 transitions, 48 flow. Second operand 3 states and 340 transitions. [2023-08-29 21:43:46,714 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 26 places, 17 transitions, 66 flow [2023-08-29 21:43:46,715 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 24 places, 17 transitions, 63 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-29 21:43:46,715 INFO L231 Difference]: Finished difference. Result has 24 places, 17 transitions, 43 flow [2023-08-29 21:43:46,715 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=243, PETRI_DIFFERENCE_MINUEND_FLOW=41, PETRI_DIFFERENCE_MINUEND_PLACES=22, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=17, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=16, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=43, PETRI_PLACES=24, PETRI_TRANSITIONS=17} [2023-08-29 21:43:46,717 INFO L281 CegarLoopForPetriNet]: 43 programPoint places, -19 predicate places. [2023-08-29 21:43:46,717 INFO L495 AbstractCegarLoop]: Abstraction has has 24 places, 17 transitions, 43 flow [2023-08-29 21:43:46,717 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 110.66666666666667) internal successors, (332), 3 states have internal predecessors, (332), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:46,717 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-29 21:43:46,717 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-08-29 21:43:46,718 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-29 21:43:46,718 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 21 more)] === [2023-08-29 21:43:46,719 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-29 21:43:46,719 INFO L85 PathProgramCache]: Analyzing trace with hash -1614861397, now seen corresponding path program 1 times [2023-08-29 21:43:46,719 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-29 21:43:46,719 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2135911241] [2023-08-29 21:43:46,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-29 21:43:46,720 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-29 21:43:46,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-29 21:43:46,815 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-29 21:43:46,815 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-29 21:43:46,815 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2135911241] [2023-08-29 21:43:46,816 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2135911241] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-29 21:43:46,816 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-29 21:43:46,816 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-29 21:43:46,816 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232639886] [2023-08-29 21:43:46,816 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-29 21:43:46,817 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-29 21:43:46,817 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-29 21:43:46,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-29 21:43:46,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-08-29 21:43:46,909 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 98 out of 243 [2023-08-29 21:43:46,910 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 24 places, 17 transitions, 43 flow. Second operand has 4 states, 4 states have (on average 99.25) internal successors, (397), 4 states have internal predecessors, (397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:46,910 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-29 21:43:46,910 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 98 of 243 [2023-08-29 21:43:46,910 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-29 21:43:46,944 INFO L130 PetriNetUnfolder]: 12/42 cut-off events. [2023-08-29 21:43:46,944 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-29 21:43:46,944 INFO L83 FinitePrefix]: Finished finitePrefix Result has 93 conditions, 42 events. 12/42 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 65 event pairs, 12 based on Foata normal form. 3/45 useless extension candidates. Maximal degree in co-relation 85. Up to 35 conditions per place. [2023-08-29 21:43:46,945 INFO L137 encePairwiseOnDemand]: 238/243 looper letters, 0 selfloop transitions, 0 changer transitions 13/13 dead transitions. [2023-08-29 21:43:46,945 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 22 places, 13 transitions, 55 flow [2023-08-29 21:43:46,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-29 21:43:46,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-29 21:43:46,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 308 transitions. [2023-08-29 21:43:46,946 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4224965706447188 [2023-08-29 21:43:46,947 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 308 transitions. [2023-08-29 21:43:46,947 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 308 transitions. [2023-08-29 21:43:46,947 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-29 21:43:46,947 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 308 transitions. [2023-08-29 21:43:46,948 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 102.66666666666667) internal successors, (308), 3 states have internal predecessors, (308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:46,949 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 243.0) internal successors, (972), 4 states have internal predecessors, (972), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:46,950 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 243.0) internal successors, (972), 4 states have internal predecessors, (972), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:46,950 INFO L175 Difference]: Start difference. First operand has 24 places, 17 transitions, 43 flow. Second operand 3 states and 308 transitions. [2023-08-29 21:43:46,950 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 22 places, 13 transitions, 55 flow [2023-08-29 21:43:46,951 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 21 places, 13 transitions, 54 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-29 21:43:46,951 INFO L231 Difference]: Finished difference. Result has 21 places, 0 transitions, 0 flow [2023-08-29 21:43:46,951 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=243, PETRI_DIFFERENCE_MINUEND_FLOW=34, PETRI_DIFFERENCE_MINUEND_PLACES=19, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=13, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=13, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=0, PETRI_PLACES=21, PETRI_TRANSITIONS=0} [2023-08-29 21:43:46,952 INFO L281 CegarLoopForPetriNet]: 43 programPoint places, -22 predicate places. [2023-08-29 21:43:46,952 INFO L495 AbstractCegarLoop]: Abstraction has has 21 places, 0 transitions, 0 flow [2023-08-29 21:43:46,952 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 99.25) internal successors, (397), 4 states have internal predecessors, (397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:46,955 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (23 of 24 remaining) [2023-08-29 21:43:46,955 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (22 of 24 remaining) [2023-08-29 21:43:46,955 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (21 of 24 remaining) [2023-08-29 21:43:46,955 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (20 of 24 remaining) [2023-08-29 21:43:46,956 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (19 of 24 remaining) [2023-08-29 21:43:46,956 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (18 of 24 remaining) [2023-08-29 21:43:46,956 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (17 of 24 remaining) [2023-08-29 21:43:46,956 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (16 of 24 remaining) [2023-08-29 21:43:46,956 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (15 of 24 remaining) [2023-08-29 21:43:46,957 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (14 of 24 remaining) [2023-08-29 21:43:46,957 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (13 of 24 remaining) [2023-08-29 21:43:46,957 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK (12 of 24 remaining) [2023-08-29 21:43:46,957 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (11 of 24 remaining) [2023-08-29 21:43:46,957 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (10 of 24 remaining) [2023-08-29 21:43:46,958 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (9 of 24 remaining) [2023-08-29 21:43:46,958 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 24 remaining) [2023-08-29 21:43:46,958 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 24 remaining) [2023-08-29 21:43:46,958 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_LEAK (6 of 24 remaining) [2023-08-29 21:43:46,958 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 24 remaining) [2023-08-29 21:43:46,959 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 24 remaining) [2023-08-29 21:43:46,959 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 24 remaining) [2023-08-29 21:43:46,959 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 24 remaining) [2023-08-29 21:43:46,959 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 24 remaining) [2023-08-29 21:43:46,959 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 24 remaining) [2023-08-29 21:43:46,960 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-08-29 21:43:46,960 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1] [2023-08-29 21:43:46,962 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-29 21:43:46,972 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 120 places, 129 transitions, 266 flow [2023-08-29 21:43:46,984 INFO L130 PetriNetUnfolder]: 17/173 cut-off events. [2023-08-29 21:43:46,984 INFO L131 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2023-08-29 21:43:46,985 INFO L83 FinitePrefix]: Finished finitePrefix Result has 179 conditions, 173 events. 17/173 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 516 event pairs, 0 based on Foata normal form. 0/129 useless extension candidates. Maximal degree in co-relation 89. Up to 4 conditions per place. [2023-08-29 21:43:46,985 INFO L82 GeneralOperation]: Start removeDead. Operand has 120 places, 129 transitions, 266 flow [2023-08-29 21:43:46,986 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 116 places, 124 transitions, 253 flow [2023-08-29 21:43:46,986 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-29 21:43:46,986 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 116 places, 124 transitions, 253 flow [2023-08-29 21:43:46,986 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 116 places, 124 transitions, 253 flow [2023-08-29 21:43:46,987 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 116 places, 124 transitions, 253 flow [2023-08-29 21:43:46,997 INFO L130 PetriNetUnfolder]: 16/168 cut-off events. [2023-08-29 21:43:46,998 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-29 21:43:46,998 INFO L83 FinitePrefix]: Finished finitePrefix Result has 173 conditions, 168 events. 16/168 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 496 event pairs, 0 based on Foata normal form. 0/124 useless extension candidates. Maximal degree in co-relation 89. Up to 4 conditions per place. [2023-08-29 21:43:47,000 INFO L119 LiptonReduction]: Number of co-enabled transitions 4000 [2023-08-29 21:43:50,001 INFO L134 LiptonReduction]: Checked pairs total: 8486 [2023-08-29 21:43:50,002 INFO L136 LiptonReduction]: Total number of compositions: 113 [2023-08-29 21:43:50,003 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-29 21:43:50,004 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=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@ff21c81, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-29 21:43:50,004 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-29 21:43:50,008 INFO L130 PetriNetUnfolder]: 2/32 cut-off events. [2023-08-29 21:43:50,008 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-29 21:43:50,008 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-29 21:43:50,008 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-08-29 21:43:50,008 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-29 21:43:50,009 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-29 21:43:50,009 INFO L85 PathProgramCache]: Analyzing trace with hash 803785229, now seen corresponding path program 1 times [2023-08-29 21:43:50,009 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-29 21:43:50,009 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1132481803] [2023-08-29 21:43:50,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-29 21:43:50,010 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-29 21:43:50,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-29 21:43:50,020 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-29 21:43:50,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-29 21:43:50,040 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-29 21:43:50,041 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-29 21:43:50,041 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-29 21:43:50,041 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-29 21:43:50,041 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-29 21:43:50,042 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-29 21:43:50,043 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-29 21:43:50,043 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-29 21:43:50,061 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-08-29 21:43:50,063 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 157 places, 171 transitions, 360 flow [2023-08-29 21:43:50,086 INFO L130 PetriNetUnfolder]: 31/288 cut-off events. [2023-08-29 21:43:50,086 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-08-29 21:43:50,088 INFO L83 FinitePrefix]: Finished finitePrefix Result has 302 conditions, 288 events. 31/288 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1016 event pairs, 0 based on Foata normal form. 0/210 useless extension candidates. Maximal degree in co-relation 175. Up to 8 conditions per place. [2023-08-29 21:43:50,088 INFO L82 GeneralOperation]: Start removeDead. Operand has 157 places, 171 transitions, 360 flow [2023-08-29 21:43:50,091 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 157 places, 171 transitions, 360 flow [2023-08-29 21:43:50,091 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-29 21:43:50,091 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 157 places, 171 transitions, 360 flow [2023-08-29 21:43:50,092 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 157 places, 171 transitions, 360 flow [2023-08-29 21:43:50,092 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 157 places, 171 transitions, 360 flow [2023-08-29 21:43:50,115 INFO L130 PetriNetUnfolder]: 31/288 cut-off events. [2023-08-29 21:43:50,115 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-08-29 21:43:50,117 INFO L83 FinitePrefix]: Finished finitePrefix Result has 302 conditions, 288 events. 31/288 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1016 event pairs, 0 based on Foata normal form. 0/210 useless extension candidates. Maximal degree in co-relation 175. Up to 8 conditions per place. [2023-08-29 21:43:50,124 INFO L119 LiptonReduction]: Number of co-enabled transitions 12080 [2023-08-29 21:43:53,512 INFO L134 LiptonReduction]: Checked pairs total: 30583 [2023-08-29 21:43:53,513 INFO L136 LiptonReduction]: Total number of compositions: 146 [2023-08-29 21:43:53,514 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-29 21:43:53,515 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=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@ff21c81, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-29 21:43:53,515 INFO L358 AbstractCegarLoop]: Starting to check reachability of 32 error locations. [2023-08-29 21:43:53,516 INFO L130 PetriNetUnfolder]: 0/1 cut-off events. [2023-08-29 21:43:53,516 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-29 21:43:53,517 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-29 21:43:53,517 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-29 21:43:53,517 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-08-29 21:43:53,517 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-29 21:43:53,517 INFO L85 PathProgramCache]: Analyzing trace with hash 30936, now seen corresponding path program 1 times [2023-08-29 21:43:53,518 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-29 21:43:53,518 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610587814] [2023-08-29 21:43:53,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-29 21:43:53,518 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-29 21:43:53,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-29 21:43:53,542 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-29 21:43:53,543 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-29 21:43:53,543 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610587814] [2023-08-29 21:43:53,543 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [610587814] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-29 21:43:53,543 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-29 21:43:53,543 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-29 21:43:53,544 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822966648] [2023-08-29 21:43:53,544 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-29 21:43:53,544 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-29 21:43:53,544 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-29 21:43:53,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-29 21:43:53,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-29 21:43:53,598 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 141 out of 317 [2023-08-29 21:43:53,599 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 67 places, 78 transitions, 174 flow. Second operand has 3 states, 3 states have (on average 141.66666666666666) internal successors, (425), 3 states have internal predecessors, (425), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:53,599 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-29 21:43:53,599 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 141 of 317 [2023-08-29 21:43:53,599 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-29 21:43:54,434 INFO L130 PetriNetUnfolder]: 5944/10008 cut-off events. [2023-08-29 21:43:54,435 INFO L131 PetriNetUnfolder]: For 84/84 co-relation queries the response was YES. [2023-08-29 21:43:54,445 INFO L83 FinitePrefix]: Finished finitePrefix Result has 19516 conditions, 10008 events. 5944/10008 cut-off events. For 84/84 co-relation queries the response was YES. Maximal size of possible extension queue 441. Compared 72372 event pairs, 5148 based on Foata normal form. 471/6708 useless extension candidates. Maximal degree in co-relation 11685. Up to 8188 conditions per place. [2023-08-29 21:43:54,494 INFO L137 encePairwiseOnDemand]: 294/317 looper letters, 70 selfloop transitions, 3 changer transitions 0/84 dead transitions. [2023-08-29 21:43:54,494 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 63 places, 84 transitions, 332 flow [2023-08-29 21:43:54,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-29 21:43:54,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-29 21:43:54,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 532 transitions. [2023-08-29 21:43:54,497 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5594111461619348 [2023-08-29 21:43:54,497 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 532 transitions. [2023-08-29 21:43:54,497 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 532 transitions. [2023-08-29 21:43:54,497 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-29 21:43:54,497 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 532 transitions. [2023-08-29 21:43:54,499 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 177.33333333333334) internal successors, (532), 3 states have internal predecessors, (532), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:54,501 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 317.0) internal successors, (1268), 4 states have internal predecessors, (1268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:54,501 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 317.0) internal successors, (1268), 4 states have internal predecessors, (1268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:54,502 INFO L175 Difference]: Start difference. First operand has 67 places, 78 transitions, 174 flow. Second operand 3 states and 532 transitions. [2023-08-29 21:43:54,502 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 63 places, 84 transitions, 332 flow [2023-08-29 21:43:54,505 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 63 places, 84 transitions, 332 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-29 21:43:54,506 INFO L231 Difference]: Finished difference. Result has 63 places, 58 transitions, 140 flow [2023-08-29 21:43:54,507 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=317, PETRI_DIFFERENCE_MINUEND_FLOW=134, PETRI_DIFFERENCE_MINUEND_PLACES=61, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=58, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=55, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=140, PETRI_PLACES=63, PETRI_TRANSITIONS=58} [2023-08-29 21:43:54,508 INFO L281 CegarLoopForPetriNet]: 67 programPoint places, -4 predicate places. [2023-08-29 21:43:54,508 INFO L495 AbstractCegarLoop]: Abstraction has has 63 places, 58 transitions, 140 flow [2023-08-29 21:43:54,509 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 141.66666666666666) internal successors, (425), 3 states have internal predecessors, (425), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:54,509 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-29 21:43:54,509 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-29 21:43:54,509 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-08-29 21:43:54,509 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-08-29 21:43:54,510 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-29 21:43:54,510 INFO L85 PathProgramCache]: Analyzing trace with hash 30937, now seen corresponding path program 1 times [2023-08-29 21:43:54,510 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-29 21:43:54,510 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472938833] [2023-08-29 21:43:54,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-29 21:43:54,510 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-29 21:43:54,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-29 21:43:54,550 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-29 21:43:54,551 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-29 21:43:54,551 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472938833] [2023-08-29 21:43:54,551 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1472938833] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-29 21:43:54,551 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-29 21:43:54,551 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-29 21:43:54,552 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209597277] [2023-08-29 21:43:54,552 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-29 21:43:54,552 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-29 21:43:54,552 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-29 21:43:54,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-29 21:43:54,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-29 21:43:54,604 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 144 out of 317 [2023-08-29 21:43:54,604 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 63 places, 58 transitions, 140 flow. Second operand has 3 states, 3 states have (on average 144.66666666666666) internal successors, (434), 3 states have internal predecessors, (434), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:54,605 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-29 21:43:54,605 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 144 of 317 [2023-08-29 21:43:54,605 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-29 21:43:55,419 INFO L130 PetriNetUnfolder]: 5943/10115 cut-off events. [2023-08-29 21:43:55,420 INFO L131 PetriNetUnfolder]: For 186/186 co-relation queries the response was YES. [2023-08-29 21:43:55,432 INFO L83 FinitePrefix]: Finished finitePrefix Result has 20082 conditions, 10115 events. 5943/10115 cut-off events. For 186/186 co-relation queries the response was YES. Maximal size of possible extension queue 423. Compared 73335 event pairs, 2808 based on Foata normal form. 0/6561 useless extension candidates. Maximal degree in co-relation 17136. Up to 9394 conditions per place. [2023-08-29 21:43:55,483 INFO L137 encePairwiseOnDemand]: 313/317 looper letters, 60 selfloop transitions, 2 changer transitions 0/73 dead transitions. [2023-08-29 21:43:55,483 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 65 places, 73 transitions, 294 flow [2023-08-29 21:43:55,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-29 21:43:55,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-29 21:43:55,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 496 transitions. [2023-08-29 21:43:55,486 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5215562565720294 [2023-08-29 21:43:55,486 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 496 transitions. [2023-08-29 21:43:55,486 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 496 transitions. [2023-08-29 21:43:55,486 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-29 21:43:55,486 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 496 transitions. [2023-08-29 21:43:55,488 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 165.33333333333334) internal successors, (496), 3 states have internal predecessors, (496), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:55,489 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 317.0) internal successors, (1268), 4 states have internal predecessors, (1268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:55,490 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 317.0) internal successors, (1268), 4 states have internal predecessors, (1268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:55,490 INFO L175 Difference]: Start difference. First operand has 63 places, 58 transitions, 140 flow. Second operand 3 states and 496 transitions. [2023-08-29 21:43:55,490 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 65 places, 73 transitions, 294 flow [2023-08-29 21:43:55,511 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 63 places, 73 transitions, 288 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-29 21:43:55,512 INFO L231 Difference]: Finished difference. Result has 64 places, 59 transitions, 148 flow [2023-08-29 21:43:55,512 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=317, PETRI_DIFFERENCE_MINUEND_FLOW=134, PETRI_DIFFERENCE_MINUEND_PLACES=61, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=58, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=56, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=148, PETRI_PLACES=64, PETRI_TRANSITIONS=59} [2023-08-29 21:43:55,513 INFO L281 CegarLoopForPetriNet]: 67 programPoint places, -3 predicate places. [2023-08-29 21:43:55,514 INFO L495 AbstractCegarLoop]: Abstraction has has 64 places, 59 transitions, 148 flow [2023-08-29 21:43:55,514 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 144.66666666666666) internal successors, (434), 3 states have internal predecessors, (434), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:55,514 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-29 21:43:55,514 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-29 21:43:55,514 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-08-29 21:43:55,515 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-08-29 21:43:55,515 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-29 21:43:55,515 INFO L85 PathProgramCache]: Analyzing trace with hash -1468473875, now seen corresponding path program 1 times [2023-08-29 21:43:55,515 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-29 21:43:55,515 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1620566668] [2023-08-29 21:43:55,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-29 21:43:55,516 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-29 21:43:55,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-29 21:43:55,647 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-29 21:43:55,647 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-29 21:43:55,647 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1620566668] [2023-08-29 21:43:55,648 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1620566668] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-29 21:43:55,648 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-29 21:43:55,648 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-29 21:43:55,648 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095362255] [2023-08-29 21:43:55,648 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-29 21:43:55,649 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-29 21:43:55,650 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-29 21:43:55,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-29 21:43:55,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-08-29 21:43:55,728 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 136 out of 317 [2023-08-29 21:43:55,729 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 64 places, 59 transitions, 148 flow. Second operand has 4 states, 4 states have (on average 137.25) internal successors, (549), 4 states have internal predecessors, (549), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:55,729 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-29 21:43:55,729 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 136 of 317 [2023-08-29 21:43:55,729 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-29 21:43:56,379 INFO L130 PetriNetUnfolder]: 4347/7300 cut-off events. [2023-08-29 21:43:56,379 INFO L131 PetriNetUnfolder]: For 379/379 co-relation queries the response was YES. [2023-08-29 21:43:56,387 INFO L83 FinitePrefix]: Finished finitePrefix Result has 14796 conditions, 7300 events. 4347/7300 cut-off events. For 379/379 co-relation queries the response was YES. Maximal size of possible extension queue 304. Compared 49448 event pairs, 3762 based on Foata normal form. 407/5250 useless extension candidates. Maximal degree in co-relation 14706. Up to 6025 conditions per place. [2023-08-29 21:43:56,415 INFO L137 encePairwiseOnDemand]: 310/317 looper letters, 63 selfloop transitions, 3 changer transitions 0/77 dead transitions. [2023-08-29 21:43:56,416 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 63 places, 77 transitions, 316 flow [2023-08-29 21:43:56,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-29 21:43:56,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-29 21:43:56,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 617 transitions. [2023-08-29 21:43:56,418 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4865930599369085 [2023-08-29 21:43:56,418 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 617 transitions. [2023-08-29 21:43:56,418 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 617 transitions. [2023-08-29 21:43:56,419 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-29 21:43:56,419 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 617 transitions. [2023-08-29 21:43:56,420 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 154.25) internal successors, (617), 4 states have internal predecessors, (617), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:56,422 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 317.0) internal successors, (1585), 5 states have internal predecessors, (1585), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:56,423 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 317.0) internal successors, (1585), 5 states have internal predecessors, (1585), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:56,423 INFO L175 Difference]: Start difference. First operand has 64 places, 59 transitions, 148 flow. Second operand 4 states and 617 transitions. [2023-08-29 21:43:56,423 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 63 places, 77 transitions, 316 flow [2023-08-29 21:43:56,424 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 62 places, 77 transitions, 314 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-29 21:43:56,425 INFO L231 Difference]: Finished difference. Result has 62 places, 55 transitions, 144 flow [2023-08-29 21:43:56,425 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=317, PETRI_DIFFERENCE_MINUEND_FLOW=138, PETRI_DIFFERENCE_MINUEND_PLACES=59, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=55, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=52, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=144, PETRI_PLACES=62, PETRI_TRANSITIONS=55} [2023-08-29 21:43:56,426 INFO L281 CegarLoopForPetriNet]: 67 programPoint places, -5 predicate places. [2023-08-29 21:43:56,426 INFO L495 AbstractCegarLoop]: Abstraction has has 62 places, 55 transitions, 144 flow [2023-08-29 21:43:56,427 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 137.25) internal successors, (549), 4 states have internal predecessors, (549), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:56,427 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-29 21:43:56,427 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-29 21:43:56,427 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-29 21:43:56,427 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-08-29 21:43:56,428 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-29 21:43:56,428 INFO L85 PathProgramCache]: Analyzing trace with hash -1468682379, now seen corresponding path program 1 times [2023-08-29 21:43:56,428 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-29 21:43:56,428 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [677818081] [2023-08-29 21:43:56,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-29 21:43:56,428 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-29 21:43:56,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-29 21:43:56,487 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-29 21:43:56,488 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-29 21:43:56,488 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [677818081] [2023-08-29 21:43:56,488 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [677818081] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-29 21:43:56,488 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [475011286] [2023-08-29 21:43:56,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-29 21:43:56,489 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-29 21:43:56,489 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-29 21:43:56,493 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-29 21:43:56,530 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-08-29 21:43:56,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-29 21:43:56,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-29 21:43:56,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-08-29 21:43:56,581 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-29 21:43:56,621 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-29 21:43:56,622 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-08-29 21:43:56,662 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-29 21:43:56,663 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [475011286] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-29 21:43:56,663 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-29 21:43:56,663 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-29 21:43:56,663 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411020190] [2023-08-29 21:43:56,663 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-29 21:43:56,664 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-29 21:43:56,665 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-29 21:43:56,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-29 21:43:56,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-29 21:43:56,876 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 140 out of 317 [2023-08-29 21:43:56,877 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 62 places, 55 transitions, 144 flow. Second operand has 8 states, 8 states have (on average 141.875) internal successors, (1135), 8 states have internal predecessors, (1135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:56,877 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-29 21:43:56,877 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 140 of 317 [2023-08-29 21:43:56,878 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-29 21:43:57,064 INFO L130 PetriNetUnfolder]: 682/1361 cut-off events. [2023-08-29 21:43:57,065 INFO L131 PetriNetUnfolder]: For 312/312 co-relation queries the response was YES. [2023-08-29 21:43:57,067 INFO L83 FinitePrefix]: Finished finitePrefix Result has 3003 conditions, 1361 events. 682/1361 cut-off events. For 312/312 co-relation queries the response was YES. Maximal size of possible extension queue 75. Compared 8223 event pairs, 0 based on Foata normal form. 156/1278 useless extension candidates. Maximal degree in co-relation 2993. Up to 816 conditions per place. [2023-08-29 21:43:57,072 INFO L137 encePairwiseOnDemand]: 313/317 looper letters, 60 selfloop transitions, 3 changer transitions 0/73 dead transitions. [2023-08-29 21:43:57,072 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 50 places, 73 transitions, 292 flow [2023-08-29 21:43:57,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-29 21:43:57,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-29 21:43:57,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 767 transitions. [2023-08-29 21:43:57,075 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.48391167192429024 [2023-08-29 21:43:57,075 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 767 transitions. [2023-08-29 21:43:57,075 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 767 transitions. [2023-08-29 21:43:57,075 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-29 21:43:57,076 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 767 transitions. [2023-08-29 21:43:57,077 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 153.4) internal successors, (767), 5 states have internal predecessors, (767), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:57,081 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 317.0) internal successors, (1902), 6 states have internal predecessors, (1902), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:57,082 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 317.0) internal successors, (1902), 6 states have internal predecessors, (1902), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:57,082 INFO L175 Difference]: Start difference. First operand has 62 places, 55 transitions, 144 flow. Second operand 5 states and 767 transitions. [2023-08-29 21:43:57,082 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 50 places, 73 transitions, 292 flow [2023-08-29 21:43:57,084 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 49 places, 73 transitions, 289 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-08-29 21:43:57,085 INFO L231 Difference]: Finished difference. Result has 49 places, 38 transitions, 99 flow [2023-08-29 21:43:57,086 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=317, PETRI_DIFFERENCE_MINUEND_FLOW=93, PETRI_DIFFERENCE_MINUEND_PLACES=45, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=38, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=35, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=99, PETRI_PLACES=49, PETRI_TRANSITIONS=38} [2023-08-29 21:43:57,086 INFO L281 CegarLoopForPetriNet]: 67 programPoint places, -18 predicate places. [2023-08-29 21:43:57,087 INFO L495 AbstractCegarLoop]: Abstraction has has 49 places, 38 transitions, 99 flow [2023-08-29 21:43:57,087 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 141.875) internal successors, (1135), 8 states have internal predecessors, (1135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:57,087 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-29 21:43:57,087 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-08-29 21:43:57,095 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-08-29 21:43:57,292 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-08-29 21:43:57,292 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-08-29 21:43:57,293 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-29 21:43:57,293 INFO L85 PathProgramCache]: Analyzing trace with hash 1721948748, now seen corresponding path program 1 times [2023-08-29 21:43:57,293 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-29 21:43:57,293 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [23568869] [2023-08-29 21:43:57,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-29 21:43:57,293 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-29 21:43:57,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-29 21:43:57,376 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-29 21:43:57,376 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-29 21:43:57,376 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [23568869] [2023-08-29 21:43:57,377 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [23568869] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-29 21:43:57,377 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-29 21:43:57,377 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-29 21:43:57,377 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434871029] [2023-08-29 21:43:57,377 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-29 21:43:57,377 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-29 21:43:57,378 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-29 21:43:57,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-29 21:43:57,378 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-08-29 21:43:57,457 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 124 out of 317 [2023-08-29 21:43:57,458 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 49 places, 38 transitions, 99 flow. Second operand has 4 states, 4 states have (on average 125.5) internal successors, (502), 4 states have internal predecessors, (502), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:57,458 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-29 21:43:57,458 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 124 of 317 [2023-08-29 21:43:57,458 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-29 21:43:57,596 INFO L130 PetriNetUnfolder]: 468/858 cut-off events. [2023-08-29 21:43:57,597 INFO L131 PetriNetUnfolder]: For 358/358 co-relation queries the response was YES. [2023-08-29 21:43:57,598 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1922 conditions, 858 events. 468/858 cut-off events. For 358/358 co-relation queries the response was YES. Maximal size of possible extension queue 39. Compared 3954 event pairs, 468 based on Foata normal form. 0/851 useless extension candidates. Maximal degree in co-relation 1911. Up to 800 conditions per place. [2023-08-29 21:43:57,598 INFO L137 encePairwiseOnDemand]: 308/317 looper letters, 0 selfloop transitions, 0 changer transitions 30/30 dead transitions. [2023-08-29 21:43:57,598 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 43 places, 30 transitions, 131 flow [2023-08-29 21:43:57,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-29 21:43:57,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-29 21:43:57,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 403 transitions. [2023-08-29 21:43:57,600 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4237644584647739 [2023-08-29 21:43:57,600 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 403 transitions. [2023-08-29 21:43:57,600 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 403 transitions. [2023-08-29 21:43:57,601 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-29 21:43:57,601 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 403 transitions. [2023-08-29 21:43:57,602 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 134.33333333333334) internal successors, (403), 3 states have internal predecessors, (403), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:57,603 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 317.0) internal successors, (1268), 4 states have internal predecessors, (1268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:57,604 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 317.0) internal successors, (1268), 4 states have internal predecessors, (1268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:57,604 INFO L175 Difference]: Start difference. First operand has 49 places, 38 transitions, 99 flow. Second operand 3 states and 403 transitions. [2023-08-29 21:43:57,604 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 43 places, 30 transitions, 131 flow [2023-08-29 21:43:57,604 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 40 places, 30 transitions, 124 flow, removed 1 selfloop flow, removed 3 redundant places. [2023-08-29 21:43:57,605 INFO L231 Difference]: Finished difference. Result has 40 places, 0 transitions, 0 flow [2023-08-29 21:43:57,605 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=317, PETRI_DIFFERENCE_MINUEND_FLOW=76, PETRI_DIFFERENCE_MINUEND_PLACES=38, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=30, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=30, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=0, PETRI_PLACES=40, PETRI_TRANSITIONS=0} [2023-08-29 21:43:57,605 INFO L281 CegarLoopForPetriNet]: 67 programPoint places, -27 predicate places. [2023-08-29 21:43:57,605 INFO L495 AbstractCegarLoop]: Abstraction has has 40 places, 0 transitions, 0 flow [2023-08-29 21:43:57,606 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 125.5) internal successors, (502), 4 states have internal predecessors, (502), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:43:57,606 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (31 of 32 remaining) [2023-08-29 21:43:57,606 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (30 of 32 remaining) [2023-08-29 21:43:57,606 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (29 of 32 remaining) [2023-08-29 21:43:57,606 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (28 of 32 remaining) [2023-08-29 21:43:57,607 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (27 of 32 remaining) [2023-08-29 21:43:57,607 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (26 of 32 remaining) [2023-08-29 21:43:57,607 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (25 of 32 remaining) [2023-08-29 21:43:57,607 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (24 of 32 remaining) [2023-08-29 21:43:57,607 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (23 of 32 remaining) [2023-08-29 21:43:57,607 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (22 of 32 remaining) [2023-08-29 21:43:57,608 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (21 of 32 remaining) [2023-08-29 21:43:57,608 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (20 of 32 remaining) [2023-08-29 21:43:57,608 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (19 of 32 remaining) [2023-08-29 21:43:57,608 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (18 of 32 remaining) [2023-08-29 21:43:57,608 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (17 of 32 remaining) [2023-08-29 21:43:57,608 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (16 of 32 remaining) [2023-08-29 21:43:57,609 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (15 of 32 remaining) [2023-08-29 21:43:57,609 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (14 of 32 remaining) [2023-08-29 21:43:57,609 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (13 of 32 remaining) [2023-08-29 21:43:57,609 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (12 of 32 remaining) [2023-08-29 21:43:57,609 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (11 of 32 remaining) [2023-08-29 21:43:57,609 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (10 of 32 remaining) [2023-08-29 21:43:57,609 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (9 of 32 remaining) [2023-08-29 21:43:57,610 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 32 remaining) [2023-08-29 21:43:57,610 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 32 remaining) [2023-08-29 21:43:57,610 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 32 remaining) [2023-08-29 21:43:57,610 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 32 remaining) [2023-08-29 21:43:57,610 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK (4 of 32 remaining) [2023-08-29 21:43:57,610 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 32 remaining) [2023-08-29 21:43:57,610 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 32 remaining) [2023-08-29 21:43:57,611 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_LEAK (1 of 32 remaining) [2023-08-29 21:43:57,611 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 32 remaining) [2023-08-29 21:43:57,611 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-08-29 21:43:57,611 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1] [2023-08-29 21:43:57,612 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-29 21:43:57,614 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 157 places, 171 transitions, 360 flow [2023-08-29 21:43:57,636 INFO L130 PetriNetUnfolder]: 31/288 cut-off events. [2023-08-29 21:43:57,636 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-08-29 21:43:57,637 INFO L83 FinitePrefix]: Finished finitePrefix Result has 302 conditions, 288 events. 31/288 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1016 event pairs, 0 based on Foata normal form. 0/210 useless extension candidates. Maximal degree in co-relation 175. Up to 8 conditions per place. [2023-08-29 21:43:57,637 INFO L82 GeneralOperation]: Start removeDead. Operand has 157 places, 171 transitions, 360 flow [2023-08-29 21:43:57,639 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 157 places, 171 transitions, 360 flow [2023-08-29 21:43:57,639 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-29 21:43:57,639 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 157 places, 171 transitions, 360 flow [2023-08-29 21:43:57,639 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 157 places, 171 transitions, 360 flow [2023-08-29 21:43:57,639 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 157 places, 171 transitions, 360 flow [2023-08-29 21:43:57,658 INFO L130 PetriNetUnfolder]: 31/288 cut-off events. [2023-08-29 21:43:57,659 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-08-29 21:43:57,660 INFO L83 FinitePrefix]: Finished finitePrefix Result has 302 conditions, 288 events. 31/288 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1016 event pairs, 0 based on Foata normal form. 0/210 useless extension candidates. Maximal degree in co-relation 175. Up to 8 conditions per place. [2023-08-29 21:43:57,667 INFO L119 LiptonReduction]: Number of co-enabled transitions 12080 [2023-08-29 21:44:01,059 INFO L134 LiptonReduction]: Checked pairs total: 34049 [2023-08-29 21:44:01,059 INFO L136 LiptonReduction]: Total number of compositions: 148 [2023-08-29 21:44:01,061 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-29 21:44:01,061 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@ff21c81, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-29 21:44:01,061 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-29 21:44:01,069 INFO L130 PetriNetUnfolder]: 10/84 cut-off events. [2023-08-29 21:44:01,069 INFO L131 PetriNetUnfolder]: For 3/3 co-relation queries the response was YES. [2023-08-29 21:44:01,069 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-29 21:44:01,069 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-08-29 21:44:01,069 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-29 21:44:01,070 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-29 21:44:01,070 INFO L85 PathProgramCache]: Analyzing trace with hash -1202437974, now seen corresponding path program 1 times [2023-08-29 21:44:01,070 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-29 21:44:01,070 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1567738823] [2023-08-29 21:44:01,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-29 21:44:01,070 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-29 21:44:01,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-29 21:44:01,085 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-29 21:44:01,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-29 21:44:01,097 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-29 21:44:01,098 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-29 21:44:01,098 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-29 21:44:01,098 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-08-29 21:44:01,098 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-29 21:44:01,099 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-29 21:44:01,099 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-29 21:44:01,099 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-29 21:44:01,121 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-08-29 21:44:01,123 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 194 places, 213 transitions, 456 flow [2023-08-29 21:44:01,167 INFO L130 PetriNetUnfolder]: 50/444 cut-off events. [2023-08-29 21:44:01,168 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-08-29 21:44:01,172 INFO L83 FinitePrefix]: Finished finitePrefix Result has 472 conditions, 444 events. 50/444 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1727 event pairs, 1 based on Foata normal form. 0/322 useless extension candidates. Maximal degree in co-relation 296. Up to 16 conditions per place. [2023-08-29 21:44:01,172 INFO L82 GeneralOperation]: Start removeDead. Operand has 194 places, 213 transitions, 456 flow [2023-08-29 21:44:01,176 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 194 places, 213 transitions, 456 flow [2023-08-29 21:44:01,176 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-29 21:44:01,176 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 194 places, 213 transitions, 456 flow [2023-08-29 21:44:01,177 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 194 places, 213 transitions, 456 flow [2023-08-29 21:44:01,177 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 194 places, 213 transitions, 456 flow [2023-08-29 21:44:01,221 INFO L130 PetriNetUnfolder]: 50/444 cut-off events. [2023-08-29 21:44:01,221 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-08-29 21:44:01,225 INFO L83 FinitePrefix]: Finished finitePrefix Result has 472 conditions, 444 events. 50/444 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1727 event pairs, 1 based on Foata normal form. 0/322 useless extension candidates. Maximal degree in co-relation 296. Up to 16 conditions per place. [2023-08-29 21:44:01,239 INFO L119 LiptonReduction]: Number of co-enabled transitions 23280 [2023-08-29 21:44:04,829 INFO L134 LiptonReduction]: Checked pairs total: 63956 [2023-08-29 21:44:04,829 INFO L136 LiptonReduction]: Total number of compositions: 172 [2023-08-29 21:44:04,831 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-29 21:44:04,831 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=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@ff21c81, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-29 21:44:04,831 INFO L358 AbstractCegarLoop]: Starting to check reachability of 40 error locations. [2023-08-29 21:44:04,833 INFO L130 PetriNetUnfolder]: 0/1 cut-off events. [2023-08-29 21:44:04,833 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-29 21:44:04,833 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-29 21:44:04,833 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-29 21:44:04,833 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 37 more)] === [2023-08-29 21:44:04,834 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-29 21:44:04,834 INFO L85 PathProgramCache]: Analyzing trace with hash 49349, now seen corresponding path program 1 times [2023-08-29 21:44:04,834 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-29 21:44:04,834 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026421447] [2023-08-29 21:44:04,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-29 21:44:04,834 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-29 21:44:04,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-29 21:44:04,866 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-29 21:44:04,867 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-29 21:44:04,867 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2026421447] [2023-08-29 21:44:04,867 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2026421447] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-29 21:44:04,867 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-29 21:44:04,867 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-29 21:44:04,868 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2011201306] [2023-08-29 21:44:04,868 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-29 21:44:04,868 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-29 21:44:04,868 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-29 21:44:04,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-29 21:44:04,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-29 21:44:04,932 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 175 out of 385 [2023-08-29 21:44:04,936 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 89 places, 105 transitions, 240 flow. Second operand has 3 states, 3 states have (on average 175.66666666666666) internal successors, (527), 3 states have internal predecessors, (527), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:04,936 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-29 21:44:04,936 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 175 of 385 [2023-08-29 21:44:04,936 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-29 21:44:14,991 INFO L130 PetriNetUnfolder]: 112902/166923 cut-off events. [2023-08-29 21:44:14,991 INFO L131 PetriNetUnfolder]: For 2116/2116 co-relation queries the response was YES. [2023-08-29 21:44:15,239 INFO L83 FinitePrefix]: Finished finitePrefix Result has 324804 conditions, 166923 events. 112902/166923 cut-off events. For 2116/2116 co-relation queries the response was YES. Maximal size of possible extension queue 4952. Compared 1396208 event pairs, 97500 based on Foata normal form. 9334/114957 useless extension candidates. Maximal degree in co-relation 83375. Up to 135312 conditions per place. [2023-08-29 21:44:15,960 INFO L137 encePairwiseOnDemand]: 354/385 looper letters, 94 selfloop transitions, 3 changer transitions 0/114 dead transitions. [2023-08-29 21:44:15,960 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 83 places, 114 transitions, 452 flow [2023-08-29 21:44:15,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-29 21:44:15,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-29 21:44:15,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 674 transitions. [2023-08-29 21:44:15,964 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5835497835497836 [2023-08-29 21:44:15,964 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 674 transitions. [2023-08-29 21:44:15,964 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 674 transitions. [2023-08-29 21:44:15,964 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-29 21:44:15,965 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 674 transitions. [2023-08-29 21:44:15,966 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 224.66666666666666) internal successors, (674), 3 states have internal predecessors, (674), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:15,968 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 385.0) internal successors, (1540), 4 states have internal predecessors, (1540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:15,968 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 385.0) internal successors, (1540), 4 states have internal predecessors, (1540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:15,968 INFO L175 Difference]: Start difference. First operand has 89 places, 105 transitions, 240 flow. Second operand 3 states and 674 transitions. [2023-08-29 21:44:15,969 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 83 places, 114 transitions, 452 flow [2023-08-29 21:44:15,971 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 83 places, 114 transitions, 452 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-29 21:44:15,973 INFO L231 Difference]: Finished difference. Result has 83 places, 77 transitions, 190 flow [2023-08-29 21:44:15,973 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=385, PETRI_DIFFERENCE_MINUEND_FLOW=184, PETRI_DIFFERENCE_MINUEND_PLACES=81, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=77, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=74, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=190, PETRI_PLACES=83, PETRI_TRANSITIONS=77} [2023-08-29 21:44:15,974 INFO L281 CegarLoopForPetriNet]: 89 programPoint places, -6 predicate places. [2023-08-29 21:44:15,974 INFO L495 AbstractCegarLoop]: Abstraction has has 83 places, 77 transitions, 190 flow [2023-08-29 21:44:15,974 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 175.66666666666666) internal successors, (527), 3 states have internal predecessors, (527), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:15,975 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-29 21:44:15,975 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-29 21:44:15,975 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-08-29 21:44:15,975 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 37 more)] === [2023-08-29 21:44:15,975 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-29 21:44:15,975 INFO L85 PathProgramCache]: Analyzing trace with hash 49348, now seen corresponding path program 1 times [2023-08-29 21:44:15,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-29 21:44:15,976 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2030144841] [2023-08-29 21:44:15,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-29 21:44:15,976 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-29 21:44:15,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-29 21:44:16,019 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-29 21:44:16,019 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-29 21:44:16,019 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2030144841] [2023-08-29 21:44:16,020 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2030144841] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-29 21:44:16,020 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-29 21:44:16,020 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-29 21:44:16,022 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922128099] [2023-08-29 21:44:16,022 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-29 21:44:16,022 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-29 21:44:16,022 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-29 21:44:16,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-29 21:44:16,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-29 21:44:16,092 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 178 out of 385 [2023-08-29 21:44:16,094 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 83 places, 77 transitions, 190 flow. Second operand has 3 states, 3 states have (on average 178.66666666666666) internal successors, (536), 3 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) [2023-08-29 21:44:16,094 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-29 21:44:16,094 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 178 of 385 [2023-08-29 21:44:16,094 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-29 21:44:26,106 INFO L130 PetriNetUnfolder]: 112901/169496 cut-off events. [2023-08-29 21:44:26,106 INFO L131 PetriNetUnfolder]: For 4684/4684 co-relation queries the response was YES. [2023-08-29 21:44:26,368 INFO L83 FinitePrefix]: Finished finitePrefix Result has 333298 conditions, 169496 events. 112901/169496 cut-off events. For 4684/4684 co-relation queries the response was YES. Maximal size of possible extension queue 5010. Compared 1442486 event pairs, 73429 based on Foata normal form. 0/110627 useless extension candidates. Maximal degree in co-relation 283813. Up to 156344 conditions per place. [2023-08-29 21:44:26,978 INFO L137 encePairwiseOnDemand]: 381/385 looper letters, 73 selfloop transitions, 2 changer transitions 0/92 dead transitions. [2023-08-29 21:44:26,979 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 85 places, 92 transitions, 370 flow [2023-08-29 21:44:26,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-29 21:44:26,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-29 21:44:26,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 611 transitions. [2023-08-29 21:44:26,981 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.529004329004329 [2023-08-29 21:44:26,981 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 611 transitions. [2023-08-29 21:44:26,981 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 611 transitions. [2023-08-29 21:44:26,981 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-29 21:44:26,981 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 611 transitions. [2023-08-29 21:44:26,983 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 203.66666666666666) internal successors, (611), 3 states have internal predecessors, (611), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:26,985 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 385.0) internal successors, (1540), 4 states have internal predecessors, (1540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:26,985 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 385.0) internal successors, (1540), 4 states have internal predecessors, (1540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:26,985 INFO L175 Difference]: Start difference. First operand has 83 places, 77 transitions, 190 flow. Second operand 3 states and 611 transitions. [2023-08-29 21:44:26,986 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 85 places, 92 transitions, 370 flow [2023-08-29 21:44:27,604 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 83 places, 92 transitions, 364 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-29 21:44:27,605 INFO L231 Difference]: Finished difference. Result has 84 places, 78 transitions, 198 flow [2023-08-29 21:44:27,605 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=385, PETRI_DIFFERENCE_MINUEND_FLOW=184, PETRI_DIFFERENCE_MINUEND_PLACES=81, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=77, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=75, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=198, PETRI_PLACES=84, PETRI_TRANSITIONS=78} [2023-08-29 21:44:27,606 INFO L281 CegarLoopForPetriNet]: 89 programPoint places, -5 predicate places. [2023-08-29 21:44:27,606 INFO L495 AbstractCegarLoop]: Abstraction has has 84 places, 78 transitions, 198 flow [2023-08-29 21:44:27,606 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 178.66666666666666) internal successors, (536), 3 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) [2023-08-29 21:44:27,606 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-29 21:44:27,606 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-29 21:44:27,606 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-08-29 21:44:27,607 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 37 more)] === [2023-08-29 21:44:27,607 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-29 21:44:27,607 INFO L85 PathProgramCache]: Analyzing trace with hash -1627881596, now seen corresponding path program 1 times [2023-08-29 21:44:27,607 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-29 21:44:27,607 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1306064228] [2023-08-29 21:44:27,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-29 21:44:27,607 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-29 21:44:27,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-29 21:44:27,663 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-29 21:44:27,663 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-29 21:44:27,663 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1306064228] [2023-08-29 21:44:27,664 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1306064228] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-29 21:44:27,664 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [871803068] [2023-08-29 21:44:27,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-29 21:44:27,664 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-29 21:44:27,664 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-29 21:44:27,669 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-29 21:44:27,673 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-08-29 21:44:27,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-29 21:44:27,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-29 21:44:27,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-08-29 21:44:27,751 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-29 21:44:27,788 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-29 21:44:27,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-08-29 21:44:27,824 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-29 21:44:27,825 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [871803068] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-29 21:44:27,825 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-29 21:44:27,825 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-29 21:44:27,825 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463176453] [2023-08-29 21:44:27,825 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-29 21:44:27,826 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-29 21:44:27,826 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-29 21:44:27,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-29 21:44:27,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-29 21:44:28,162 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 174 out of 385 [2023-08-29 21:44:28,163 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 84 places, 78 transitions, 198 flow. Second operand has 8 states, 8 states have (on average 175.875) internal successors, (1407), 8 states have internal predecessors, (1407), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:28,163 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-29 21:44:28,163 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 174 of 385 [2023-08-29 21:44:28,163 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-29 21:44:29,959 INFO L130 PetriNetUnfolder]: 18380/29615 cut-off events. [2023-08-29 21:44:29,960 INFO L131 PetriNetUnfolder]: For 10220/10220 co-relation queries the response was YES. [2023-08-29 21:44:30,002 INFO L83 FinitePrefix]: Finished finitePrefix Result has 66137 conditions, 29615 events. 18380/29615 cut-off events. For 10220/10220 co-relation queries the response was YES. Maximal size of possible extension queue 1072. Compared 234650 event pairs, 0 based on Foata normal form. 2562/25654 useless extension candidates. Maximal degree in co-relation 6988. Up to 17862 conditions per place. [2023-08-29 21:44:30,092 INFO L137 encePairwiseOnDemand]: 381/385 looper letters, 119 selfloop transitions, 4 changer transitions 0/139 dead transitions. [2023-08-29 21:44:30,092 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 74 places, 139 transitions, 555 flow [2023-08-29 21:44:30,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-29 21:44:30,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-29 21:44:30,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1173 transitions. [2023-08-29 21:44:30,095 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5077922077922078 [2023-08-29 21:44:30,095 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1173 transitions. [2023-08-29 21:44:30,095 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1173 transitions. [2023-08-29 21:44:30,096 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-29 21:44:30,096 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1173 transitions. [2023-08-29 21:44:30,099 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 195.5) internal successors, (1173), 6 states have internal predecessors, (1173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:30,101 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 385.0) internal successors, (2695), 7 states have internal predecessors, (2695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:30,102 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 385.0) internal successors, (2695), 7 states have internal predecessors, (2695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:30,102 INFO L175 Difference]: Start difference. First operand has 84 places, 78 transitions, 198 flow. Second operand 6 states and 1173 transitions. [2023-08-29 21:44:30,102 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 74 places, 139 transitions, 555 flow [2023-08-29 21:44:30,124 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 73 places, 139 transitions, 547 flow, removed 3 selfloop flow, removed 1 redundant places. [2023-08-29 21:44:30,125 INFO L231 Difference]: Finished difference. Result has 73 places, 61 transitions, 153 flow [2023-08-29 21:44:30,125 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=385, PETRI_DIFFERENCE_MINUEND_FLOW=141, PETRI_DIFFERENCE_MINUEND_PLACES=68, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=60, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=57, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=153, PETRI_PLACES=73, PETRI_TRANSITIONS=61} [2023-08-29 21:44:30,126 INFO L281 CegarLoopForPetriNet]: 89 programPoint places, -16 predicate places. [2023-08-29 21:44:30,126 INFO L495 AbstractCegarLoop]: Abstraction has has 73 places, 61 transitions, 153 flow [2023-08-29 21:44:30,127 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 175.875) internal successors, (1407), 8 states have internal predecessors, (1407), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:30,127 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-29 21:44:30,127 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-29 21:44:30,134 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-08-29 21:44:30,331 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-29 21:44:30,332 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 37 more)] === [2023-08-29 21:44:30,332 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-29 21:44:30,332 INFO L85 PathProgramCache]: Analyzing trace with hash -1627651594, now seen corresponding path program 1 times [2023-08-29 21:44:30,333 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-29 21:44:30,333 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538399284] [2023-08-29 21:44:30,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-29 21:44:30,333 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-29 21:44:30,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-29 21:44:30,424 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-29 21:44:30,424 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-29 21:44:30,424 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538399284] [2023-08-29 21:44:30,425 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1538399284] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-29 21:44:30,425 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-29 21:44:30,425 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-29 21:44:30,425 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964966580] [2023-08-29 21:44:30,425 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-29 21:44:30,426 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-29 21:44:30,426 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-29 21:44:30,426 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-29 21:44:30,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-08-29 21:44:30,540 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 166 out of 385 [2023-08-29 21:44:30,541 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 73 places, 61 transitions, 153 flow. Second operand has 4 states, 4 states have (on average 167.25) internal successors, (669), 4 states have internal predecessors, (669), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:30,541 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-29 21:44:30,541 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 166 of 385 [2023-08-29 21:44:30,541 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-29 21:44:31,626 INFO L130 PetriNetUnfolder]: 11218/17565 cut-off events. [2023-08-29 21:44:31,627 INFO L131 PetriNetUnfolder]: For 5208/5208 co-relation queries the response was YES. [2023-08-29 21:44:31,649 INFO L83 FinitePrefix]: Finished finitePrefix Result has 37232 conditions, 17565 events. 11218/17565 cut-off events. For 5208/5208 co-relation queries the response was YES. Maximal size of possible extension queue 596. Compared 122874 event pairs, 11218 based on Foata normal form. 399/14735 useless extension candidates. Maximal degree in co-relation 24312. Up to 16008 conditions per place. [2023-08-29 21:44:31,699 INFO L137 encePairwiseOnDemand]: 378/385 looper letters, 38 selfloop transitions, 1 changer transitions 0/55 dead transitions. [2023-08-29 21:44:31,700 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 69 places, 55 transitions, 219 flow [2023-08-29 21:44:31,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-29 21:44:31,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-29 21:44:31,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 541 transitions. [2023-08-29 21:44:31,701 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4683982683982684 [2023-08-29 21:44:31,701 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 541 transitions. [2023-08-29 21:44:31,701 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 541 transitions. [2023-08-29 21:44:31,702 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-29 21:44:31,702 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 541 transitions. [2023-08-29 21:44:31,703 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 180.33333333333334) internal successors, (541), 3 states have internal predecessors, (541), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:31,704 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 385.0) internal successors, (1540), 4 states have internal predecessors, (1540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:31,704 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 385.0) internal successors, (1540), 4 states have internal predecessors, (1540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:31,704 INFO L175 Difference]: Start difference. First operand has 73 places, 61 transitions, 153 flow. Second operand 3 states and 541 transitions. [2023-08-29 21:44:31,704 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 69 places, 55 transitions, 219 flow [2023-08-29 21:44:31,707 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 66 places, 55 transitions, 210 flow, removed 2 selfloop flow, removed 3 redundant places. [2023-08-29 21:44:31,708 INFO L231 Difference]: Finished difference. Result has 66 places, 55 transitions, 134 flow [2023-08-29 21:44:31,708 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=385, PETRI_DIFFERENCE_MINUEND_FLOW=132, PETRI_DIFFERENCE_MINUEND_PLACES=64, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=55, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=54, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=134, PETRI_PLACES=66, PETRI_TRANSITIONS=55} [2023-08-29 21:44:31,708 INFO L281 CegarLoopForPetriNet]: 89 programPoint places, -23 predicate places. [2023-08-29 21:44:31,708 INFO L495 AbstractCegarLoop]: Abstraction has has 66 places, 55 transitions, 134 flow [2023-08-29 21:44:31,709 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 167.25) internal successors, (669), 4 states have internal predecessors, (669), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:31,709 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-29 21:44:31,709 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-08-29 21:44:31,709 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2023-08-29 21:44:31,709 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 37 more)] === [2023-08-29 21:44:31,709 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-29 21:44:31,709 INFO L85 PathProgramCache]: Analyzing trace with hash 1082407807, now seen corresponding path program 1 times [2023-08-29 21:44:31,709 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-29 21:44:31,709 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2030806568] [2023-08-29 21:44:31,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-29 21:44:31,710 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-29 21:44:31,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-29 21:44:31,775 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-29 21:44:31,776 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-29 21:44:31,776 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2030806568] [2023-08-29 21:44:31,776 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2030806568] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-29 21:44:31,776 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-29 21:44:31,776 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-29 21:44:31,777 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198257867] [2023-08-29 21:44:31,777 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-29 21:44:31,777 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-29 21:44:31,777 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-29 21:44:31,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-29 21:44:31,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-08-29 21:44:31,895 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 150 out of 385 [2023-08-29 21:44:31,896 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 66 places, 55 transitions, 134 flow. Second operand has 4 states, 4 states have (on average 151.5) internal successors, (606), 4 states have internal predecessors, (606), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:31,896 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-29 21:44:31,896 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 150 of 385 [2023-08-29 21:44:31,896 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-29 21:44:32,615 INFO L130 PetriNetUnfolder]: 9282/13431 cut-off events. [2023-08-29 21:44:32,615 INFO L131 PetriNetUnfolder]: For 1682/1682 co-relation queries the response was YES. [2023-08-29 21:44:32,634 INFO L83 FinitePrefix]: Finished finitePrefix Result has 28426 conditions, 13431 events. 9282/13431 cut-off events. For 1682/1682 co-relation queries the response was YES. Maximal size of possible extension queue 365. Compared 75440 event pairs, 9282 based on Foata normal form. 0/13395 useless extension candidates. Maximal degree in co-relation 28416. Up to 13274 conditions per place. [2023-08-29 21:44:32,642 INFO L137 encePairwiseOnDemand]: 372/385 looper letters, 0 selfloop transitions, 0 changer transitions 43/43 dead transitions. [2023-08-29 21:44:32,642 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 56 places, 43 transitions, 184 flow [2023-08-29 21:44:32,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-29 21:44:32,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-29 21:44:32,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 497 transitions. [2023-08-29 21:44:32,644 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4303030303030303 [2023-08-29 21:44:32,644 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 497 transitions. [2023-08-29 21:44:32,644 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 497 transitions. [2023-08-29 21:44:32,644 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-29 21:44:32,644 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 497 transitions. [2023-08-29 21:44:32,645 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 165.66666666666666) internal successors, (497), 3 states have internal predecessors, (497), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:32,647 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 385.0) internal successors, (1540), 4 states have internal predecessors, (1540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:32,647 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 385.0) internal successors, (1540), 4 states have internal predecessors, (1540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:32,648 INFO L175 Difference]: Start difference. First operand has 66 places, 55 transitions, 134 flow. Second operand 3 states and 497 transitions. [2023-08-29 21:44:32,648 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 56 places, 43 transitions, 184 flow [2023-08-29 21:44:32,650 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 55 places, 43 transitions, 183 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-29 21:44:32,650 INFO L231 Difference]: Finished difference. Result has 55 places, 0 transitions, 0 flow [2023-08-29 21:44:32,650 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=385, PETRI_DIFFERENCE_MINUEND_FLOW=109, PETRI_DIFFERENCE_MINUEND_PLACES=53, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=43, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=43, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=0, PETRI_PLACES=55, PETRI_TRANSITIONS=0} [2023-08-29 21:44:32,651 INFO L281 CegarLoopForPetriNet]: 89 programPoint places, -34 predicate places. [2023-08-29 21:44:32,651 INFO L495 AbstractCegarLoop]: Abstraction has has 55 places, 0 transitions, 0 flow [2023-08-29 21:44:32,651 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 151.5) internal successors, (606), 4 states have internal predecessors, (606), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:32,651 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (39 of 40 remaining) [2023-08-29 21:44:32,652 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (38 of 40 remaining) [2023-08-29 21:44:32,652 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (37 of 40 remaining) [2023-08-29 21:44:32,652 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (36 of 40 remaining) [2023-08-29 21:44:32,652 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (35 of 40 remaining) [2023-08-29 21:44:32,652 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (34 of 40 remaining) [2023-08-29 21:44:32,652 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (33 of 40 remaining) [2023-08-29 21:44:32,653 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (32 of 40 remaining) [2023-08-29 21:44:32,653 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (31 of 40 remaining) [2023-08-29 21:44:32,653 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (30 of 40 remaining) [2023-08-29 21:44:32,653 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (29 of 40 remaining) [2023-08-29 21:44:32,653 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (28 of 40 remaining) [2023-08-29 21:44:32,653 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (27 of 40 remaining) [2023-08-29 21:44:32,653 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (26 of 40 remaining) [2023-08-29 21:44:32,654 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (25 of 40 remaining) [2023-08-29 21:44:32,654 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (24 of 40 remaining) [2023-08-29 21:44:32,654 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (23 of 40 remaining) [2023-08-29 21:44:32,654 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (22 of 40 remaining) [2023-08-29 21:44:32,654 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (21 of 40 remaining) [2023-08-29 21:44:32,654 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (20 of 40 remaining) [2023-08-29 21:44:32,655 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (19 of 40 remaining) [2023-08-29 21:44:32,655 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (18 of 40 remaining) [2023-08-29 21:44:32,655 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (17 of 40 remaining) [2023-08-29 21:44:32,655 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (16 of 40 remaining) [2023-08-29 21:44:32,655 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (15 of 40 remaining) [2023-08-29 21:44:32,655 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (14 of 40 remaining) [2023-08-29 21:44:32,656 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (13 of 40 remaining) [2023-08-29 21:44:32,656 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (12 of 40 remaining) [2023-08-29 21:44:32,656 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (11 of 40 remaining) [2023-08-29 21:44:32,656 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (10 of 40 remaining) [2023-08-29 21:44:32,656 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (9 of 40 remaining) [2023-08-29 21:44:32,656 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 40 remaining) [2023-08-29 21:44:32,656 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 40 remaining) [2023-08-29 21:44:32,657 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 40 remaining) [2023-08-29 21:44:32,657 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 40 remaining) [2023-08-29 21:44:32,657 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK (4 of 40 remaining) [2023-08-29 21:44:32,657 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 40 remaining) [2023-08-29 21:44:32,657 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_LEAK (2 of 40 remaining) [2023-08-29 21:44:32,657 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 40 remaining) [2023-08-29 21:44:32,658 INFO L805 garLoopResultBuilder]: Registering result SAFE for location t_funErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 40 remaining) [2023-08-29 21:44:32,658 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-08-29 21:44:32,658 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1] [2023-08-29 21:44:32,659 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-29 21:44:32,661 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 194 places, 213 transitions, 456 flow [2023-08-29 21:44:32,698 INFO L130 PetriNetUnfolder]: 50/444 cut-off events. [2023-08-29 21:44:32,698 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-08-29 21:44:32,703 INFO L83 FinitePrefix]: Finished finitePrefix Result has 472 conditions, 444 events. 50/444 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1727 event pairs, 1 based on Foata normal form. 0/322 useless extension candidates. Maximal degree in co-relation 296. Up to 16 conditions per place. [2023-08-29 21:44:32,703 INFO L82 GeneralOperation]: Start removeDead. Operand has 194 places, 213 transitions, 456 flow [2023-08-29 21:44:32,705 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 194 places, 213 transitions, 456 flow [2023-08-29 21:44:32,705 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-29 21:44:32,705 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 194 places, 213 transitions, 456 flow [2023-08-29 21:44:32,706 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 194 places, 213 transitions, 456 flow [2023-08-29 21:44:32,706 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 194 places, 213 transitions, 456 flow [2023-08-29 21:44:32,742 INFO L130 PetriNetUnfolder]: 50/444 cut-off events. [2023-08-29 21:44:32,743 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-08-29 21:44:32,747 INFO L83 FinitePrefix]: Finished finitePrefix Result has 472 conditions, 444 events. 50/444 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1727 event pairs, 1 based on Foata normal form. 0/322 useless extension candidates. Maximal degree in co-relation 296. Up to 16 conditions per place. [2023-08-29 21:44:32,756 INFO L119 LiptonReduction]: Number of co-enabled transitions 23280 [2023-08-29 21:44:36,173 INFO L134 LiptonReduction]: Checked pairs total: 63214 [2023-08-29 21:44:36,173 INFO L136 LiptonReduction]: Total number of compositions: 172 [2023-08-29 21:44:36,175 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-29 21:44:36,175 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=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@ff21c81, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-29 21:44:36,175 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-29 21:44:36,183 INFO L130 PetriNetUnfolder]: 19/134 cut-off events. [2023-08-29 21:44:36,183 INFO L131 PetriNetUnfolder]: For 10/10 co-relation queries the response was YES. [2023-08-29 21:44:36,183 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-29 21:44:36,183 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1] [2023-08-29 21:44:36,183 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-29 21:44:36,183 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-29 21:44:36,183 INFO L85 PathProgramCache]: Analyzing trace with hash -186148786, now seen corresponding path program 1 times [2023-08-29 21:44:36,183 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-29 21:44:36,184 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1142970602] [2023-08-29 21:44:36,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-29 21:44:36,184 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-29 21:44:36,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-29 21:44:36,194 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-29 21:44:36,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-29 21:44:36,206 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-29 21:44:36,207 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-29 21:44:36,207 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-29 21:44:36,207 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2023-08-29 21:44:36,207 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-29 21:44:36,208 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-29 21:44:36,208 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-29 21:44:36,208 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-29 21:44:36,230 INFO L144 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2023-08-29 21:44:36,233 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 231 places, 255 transitions, 554 flow [2023-08-29 21:44:36,305 INFO L130 PetriNetUnfolder]: 81/684 cut-off events. [2023-08-29 21:44:36,305 INFO L131 PetriNetUnfolder]: For 48/48 co-relation queries the response was YES. [2023-08-29 21:44:36,315 INFO L83 FinitePrefix]: Finished finitePrefix Result has 739 conditions, 684 events. 81/684 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 17. Compared 3024 event pairs, 6 based on Foata normal form. 0/498 useless extension candidates. Maximal degree in co-relation 464. Up to 32 conditions per place. [2023-08-29 21:44:36,315 INFO L82 GeneralOperation]: Start removeDead. Operand has 231 places, 255 transitions, 554 flow [2023-08-29 21:44:36,322 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 231 places, 255 transitions, 554 flow [2023-08-29 21:44:36,322 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-29 21:44:36,322 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 231 places, 255 transitions, 554 flow [2023-08-29 21:44:36,323 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 231 places, 255 transitions, 554 flow [2023-08-29 21:44:36,323 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 231 places, 255 transitions, 554 flow [2023-08-29 21:44:36,392 INFO L130 PetriNetUnfolder]: 81/684 cut-off events. [2023-08-29 21:44:36,393 INFO L131 PetriNetUnfolder]: For 48/48 co-relation queries the response was YES. [2023-08-29 21:44:36,402 INFO L83 FinitePrefix]: Finished finitePrefix Result has 739 conditions, 684 events. 81/684 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 17. Compared 3024 event pairs, 6 based on Foata normal form. 0/498 useless extension candidates. Maximal degree in co-relation 464. Up to 32 conditions per place. [2023-08-29 21:44:36,422 INFO L119 LiptonReduction]: Number of co-enabled transitions 37920 [2023-08-29 21:44:39,920 INFO L134 LiptonReduction]: Checked pairs total: 112480 [2023-08-29 21:44:39,920 INFO L136 LiptonReduction]: Total number of compositions: 211 [2023-08-29 21:44:39,922 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-29 21:44:39,922 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=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@ff21c81, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-29 21:44:39,922 INFO L358 AbstractCegarLoop]: Starting to check reachability of 48 error locations. [2023-08-29 21:44:39,923 INFO L130 PetriNetUnfolder]: 0/2 cut-off events. [2023-08-29 21:44:39,923 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-29 21:44:39,923 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-29 21:44:39,923 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-29 21:44:39,923 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [t_funErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, t_funErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 45 more)] === [2023-08-29 21:44:39,923 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-29 21:44:39,924 INFO L85 PathProgramCache]: Analyzing trace with hash 71121, now seen corresponding path program 1 times [2023-08-29 21:44:39,924 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-29 21:44:39,924 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1980178700] [2023-08-29 21:44:39,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-29 21:44:39,924 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-29 21:44:39,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-29 21:44:39,946 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-29 21:44:39,947 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-29 21:44:39,947 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1980178700] [2023-08-29 21:44:39,947 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1980178700] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-29 21:44:39,947 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-29 21:44:39,947 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-29 21:44:39,947 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760609527] [2023-08-29 21:44:39,948 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-29 21:44:39,948 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-29 21:44:39,948 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-29 21:44:39,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-29 21:44:39,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-29 21:44:40,017 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 209 out of 466 [2023-08-29 21:44:40,018 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 111 places, 132 transitions, 308 flow. Second operand has 3 states, 3 states have (on average 209.66666666666666) internal successors, (629), 3 states have internal predecessors, (629), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-29 21:44:40,018 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-29 21:44:40,018 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 209 of 466 [2023-08-29 21:44:40,018 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand