/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-SemanticLbe.epf --traceabstraction.use.on-demand.petri.net.difference true -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -i ../../../trunk/examples/svcomp/pthread/fib_unsafe-10.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-wip.dk.repeated-lipton-a802222-m [2022-12-12 18:16:26,777 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-12 18:16:26,780 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-12 18:16:26,839 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-12 18:16:26,841 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-12 18:16:26,843 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-12 18:16:26,846 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-12 18:16:26,850 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-12 18:16:26,854 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-12 18:16:26,859 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-12 18:16:26,860 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-12 18:16:26,861 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-12 18:16:26,862 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-12 18:16:26,864 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-12 18:16:26,865 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-12 18:16:26,866 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-12 18:16:26,866 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-12 18:16:26,867 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-12 18:16:26,871 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-12 18:16:26,876 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-12 18:16:26,877 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-12 18:16:26,878 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-12 18:16:26,879 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-12 18:16:26,880 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-12 18:16:26,886 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-12 18:16:26,887 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-12 18:16:26,887 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-12 18:16:26,889 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-12 18:16:26,889 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-12 18:16:26,890 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-12 18:16:26,890 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-12 18:16:26,892 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-12 18:16:26,893 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-12 18:16:26,894 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-12 18:16:26,894 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-12 18:16:26,895 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-12 18:16:26,895 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-12 18:16:26,895 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-12 18:16:26,896 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-12 18:16:26,896 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-12 18:16:26,897 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-12 18:16:26,898 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-SemanticLbe.epf [2022-12-12 18:16:26,929 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-12 18:16:26,930 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-12 18:16:26,931 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-12 18:16:26,931 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-12 18:16:26,932 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-12-12 18:16:26,933 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-12-12 18:16:26,933 INFO L138 SettingsManager]: * Use SBE=true [2022-12-12 18:16:26,933 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-12 18:16:26,933 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-12 18:16:26,933 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-12 18:16:26,934 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-12 18:16:26,934 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-12 18:16:26,934 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-12 18:16:26,935 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-12 18:16:26,935 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-12 18:16:26,935 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-12 18:16:26,935 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-12 18:16:26,935 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-12 18:16:26,935 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-12 18:16:26,935 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-12 18:16:26,936 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-12-12 18:16:26,936 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-12-12 18:16:26,936 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-12 18:16:26,936 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-12 18:16:26,936 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-12 18:16:26,936 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-12 18:16:26,936 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-12 18:16:26,937 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-12 18:16:26,937 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-12-12 18:16:26,937 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-12-12 18:16:26,937 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use on-demand Petri net difference -> true [2022-12-12 18:16:27,270 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-12 18:16:27,292 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-12 18:16:27,294 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-12 18:16:27,295 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-12 18:16:27,295 INFO L275 PluginConnector]: CDTParser initialized [2022-12-12 18:16:27,296 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/pthread/fib_unsafe-10.i [2022-12-12 18:16:28,714 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-12 18:16:29,139 INFO L351 CDTParser]: Found 1 translation units. [2022-12-12 18:16:29,139 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/pthread/fib_unsafe-10.i [2022-12-12 18:16:29,173 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/12c8f64b6/9f92832975a943c6ac5f00ad01ef87fb/FLAGcf8dbe054 [2022-12-12 18:16:29,190 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/12c8f64b6/9f92832975a943c6ac5f00ad01ef87fb [2022-12-12 18:16:29,192 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-12 18:16:29,193 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2022-12-12 18:16:29,195 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-12 18:16:29,195 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-12 18:16:29,197 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-12 18:16:29,206 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.12 06:16:29" (1/1) ... [2022-12-12 18:16:29,207 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@74c2b20b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 06:16:29, skipping insertion in model container [2022-12-12 18:16:29,207 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.12 06:16:29" (1/1) ... [2022-12-12 18:16:29,214 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-12 18:16:29,308 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-12 18:16:29,758 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/pthread/fib_unsafe-10.i[30243,30256] [2022-12-12 18:16:29,779 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_begin [2022-12-12 18:16:29,779 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_end [2022-12-12 18:16:29,782 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_begin [2022-12-12 18:16:29,795 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_end [2022-12-12 18:16:29,801 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_begin [2022-12-12 18:16:29,801 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_end [2022-12-12 18:16:29,801 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_begin [2022-12-12 18:16:29,802 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_end [2022-12-12 18:16:29,805 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_begin [2022-12-12 18:16:29,807 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_end [2022-12-12 18:16:29,809 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-12 18:16:29,823 INFO L203 MainTranslator]: Completed pre-run [2022-12-12 18:16:29,900 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/pthread/fib_unsafe-10.i[30243,30256] [2022-12-12 18:16:29,901 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_begin [2022-12-12 18:16:29,902 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_end [2022-12-12 18:16:29,902 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_begin [2022-12-12 18:16:29,903 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_end [2022-12-12 18:16:29,923 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_begin [2022-12-12 18:16:29,923 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_end [2022-12-12 18:16:29,924 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_begin [2022-12-12 18:16:29,924 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_end [2022-12-12 18:16:29,928 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_begin [2022-12-12 18:16:29,928 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_end [2022-12-12 18:16:29,933 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-12 18:16:29,970 INFO L208 MainTranslator]: Completed translation [2022-12-12 18:16:29,970 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 06:16:29 WrapperNode [2022-12-12 18:16:29,970 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-12 18:16:29,972 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-12 18:16:29,972 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-12 18:16:29,972 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-12 18:16:29,978 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 06:16:29" (1/1) ... [2022-12-12 18:16:30,010 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 06:16:29" (1/1) ... [2022-12-12 18:16:30,033 INFO L138 Inliner]: procedures = 165, calls = 28, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 76 [2022-12-12 18:16:30,034 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-12 18:16:30,035 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-12 18:16:30,035 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-12 18:16:30,035 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-12 18:16:30,043 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 06:16:29" (1/1) ... [2022-12-12 18:16:30,043 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 06:16:29" (1/1) ... [2022-12-12 18:16:30,061 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 06:16:29" (1/1) ... [2022-12-12 18:16:30,061 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 06:16:29" (1/1) ... [2022-12-12 18:16:30,069 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 06:16:29" (1/1) ... [2022-12-12 18:16:30,088 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 06:16:29" (1/1) ... [2022-12-12 18:16:30,089 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 06:16:29" (1/1) ... [2022-12-12 18:16:30,090 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 06:16:29" (1/1) ... [2022-12-12 18:16:30,092 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-12 18:16:30,093 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-12 18:16:30,093 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-12 18:16:30,093 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-12 18:16:30,093 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 06:16:29" (1/1) ... [2022-12-12 18:16:30,098 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-12 18:16:30,126 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-12-12 18:16:30,179 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-12 18:16:30,229 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-12 18:16:30,273 INFO L130 BoogieDeclarations]: Found specification of procedure t1 [2022-12-12 18:16:30,274 INFO L138 BoogieDeclarations]: Found implementation of procedure t1 [2022-12-12 18:16:30,274 INFO L130 BoogieDeclarations]: Found specification of procedure t2 [2022-12-12 18:16:30,274 INFO L138 BoogieDeclarations]: Found implementation of procedure t2 [2022-12-12 18:16:30,274 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-12-12 18:16:30,274 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2022-12-12 18:16:30,274 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-12 18:16:30,274 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-12-12 18:16:30,274 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-12-12 18:16:30,274 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-12 18:16:30,274 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2022-12-12 18:16:30,275 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-12 18:16:30,275 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-12 18:16:30,276 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2022-12-12 18:16:30,523 INFO L236 CfgBuilder]: Building ICFG [2022-12-12 18:16:30,524 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-12 18:16:30,818 INFO L277 CfgBuilder]: Performing block encoding [2022-12-12 18:16:30,824 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-12 18:16:30,824 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2022-12-12 18:16:30,826 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.12 06:16:30 BoogieIcfgContainer [2022-12-12 18:16:30,826 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-12 18:16:30,830 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-12 18:16:30,830 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-12 18:16:30,833 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-12 18:16:30,833 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.12 06:16:29" (1/3) ... [2022-12-12 18:16:30,833 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51e39fdb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.12 06:16:30, skipping insertion in model container [2022-12-12 18:16:30,834 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 06:16:29" (2/3) ... [2022-12-12 18:16:30,834 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51e39fdb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.12 06:16:30, skipping insertion in model container [2022-12-12 18:16:30,834 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.12 06:16:30" (3/3) ... [2022-12-12 18:16:30,835 INFO L112 eAbstractionObserver]: Analyzing ICFG fib_unsafe-10.i [2022-12-12 18:16:30,851 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-12 18:16:30,852 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-12 18:16:30,852 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2022-12-12 18:16:30,944 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2022-12-12 18:16:30,981 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 93 places, 93 transitions, 196 flow [2022-12-12 18:16:31,066 INFO L130 PetriNetUnfolder]: 7/91 cut-off events. [2022-12-12 18:16:31,066 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2022-12-12 18:16:31,072 INFO L83 FinitePrefix]: Finished finitePrefix Result has 98 conditions, 91 events. 7/91 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 74 event pairs, 0 based on Foata normal form. 0/83 useless extension candidates. Maximal degree in co-relation 65. Up to 2 conditions per place. [2022-12-12 18:16:31,073 INFO L82 GeneralOperation]: Start removeDead. Operand has 93 places, 93 transitions, 196 flow [2022-12-12 18:16:31,080 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 91 places, 91 transitions, 188 flow [2022-12-12 18:16:31,082 INFO L203 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2022-12-12 18:16:31,113 INFO L174 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 91 places, 91 transitions, 188 flow [2022-12-12 18:16:31,117 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 91 places, 91 transitions, 188 flow [2022-12-12 18:16:31,151 INFO L130 PetriNetUnfolder]: 7/91 cut-off events. [2022-12-12 18:16:31,151 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2022-12-12 18:16:31,152 INFO L83 FinitePrefix]: Finished finitePrefix Result has 98 conditions, 91 events. 7/91 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 74 event pairs, 0 based on Foata normal form. 0/83 useless extension candidates. Maximal degree in co-relation 65. Up to 2 conditions per place. [2022-12-12 18:16:31,154 INFO L222 LiptonReduction]: Starting Lipton reduction on Petri net that has 91 places, 91 transitions, 188 flow [2022-12-12 18:16:31,155 INFO L226 LiptonReduction]: Number of co-enabled transitions 1914 [2022-12-12 18:16:35,307 INFO L241 LiptonReduction]: Total number of compositions: 79 [2022-12-12 18:16:35,320 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-12 18:16:35,325 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=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@111301dd, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, Conditionality=CONDITIONAL_DISJUNCTIVE, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-12 18:16:35,326 INFO L358 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2022-12-12 18:16:35,331 INFO L130 PetriNetUnfolder]: 3/26 cut-off events. [2022-12-12 18:16:35,331 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2022-12-12 18:16:35,331 INFO L206 CegarLoopForPetriNet]: Found error trace [2022-12-12 18:16:35,332 INFO L214 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2022-12-12 18:16:35,332 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-12-12 18:16:35,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-12 18:16:35,336 INFO L85 PathProgramCache]: Analyzing trace with hash 1807783243, now seen corresponding path program 1 times [2022-12-12 18:16:35,343 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-12-12 18:16:35,344 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1314430012] [2022-12-12 18:16:35,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-12 18:16:35,344 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-12 18:16:35,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-12 18:16:35,577 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 18:16:35,578 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-12-12 18:16:35,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1314430012] [2022-12-12 18:16:35,578 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1314430012] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-12 18:16:35,579 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-12 18:16:35,579 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-12 18:16:35,580 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685639117] [2022-12-12 18:16:35,580 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-12 18:16:35,587 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-12 18:16:35,587 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-12-12 18:16:35,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-12 18:16:35,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-12 18:16:35,619 INFO L481 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 28 [2022-12-12 18:16:35,621 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 32 places, 28 transitions, 62 flow. Second operand has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-12 18:16:35,621 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-12-12 18:16:35,621 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 28 [2022-12-12 18:16:35,622 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-12-12 18:16:35,774 INFO L130 PetriNetUnfolder]: 657/1007 cut-off events. [2022-12-12 18:16:35,774 INFO L131 PetriNetUnfolder]: For 7/7 co-relation queries the response was YES. [2022-12-12 18:16:35,776 INFO L83 FinitePrefix]: Finished finitePrefix Result has 2023 conditions, 1007 events. 657/1007 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 86. Compared 4231 event pairs, 175 based on Foata normal form. 0/387 useless extension candidates. Maximal degree in co-relation 2013. Up to 641 conditions per place. [2022-12-12 18:16:35,782 INFO L137 encePairwiseOnDemand]: 24/28 looper letters, 38 selfloop transitions, 2 changer transitions 1/45 dead transitions. [2022-12-12 18:16:35,782 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 34 places, 45 transitions, 178 flow [2022-12-12 18:16:35,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-12 18:16:35,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2022-12-12 18:16:35,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 55 transitions. [2022-12-12 18:16:35,795 INFO L526 CegarLoopForPetriNet]: DFA transition density 0.6547619047619048 [2022-12-12 18:16:35,799 INFO L295 CegarLoopForPetriNet]: 32 programPoint places, 2 predicate places. [2022-12-12 18:16:35,799 INFO L82 GeneralOperation]: Start removeDead. Operand has 34 places, 45 transitions, 178 flow [2022-12-12 18:16:35,804 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 33 places, 44 transitions, 174 flow [2022-12-12 18:16:35,805 INFO L495 AbstractCegarLoop]: Abstraction has has 33 places, 44 transitions, 174 flow [2022-12-12 18:16:35,806 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-12 18:16:35,806 INFO L206 CegarLoopForPetriNet]: Found error trace [2022-12-12 18:16:35,806 INFO L214 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-12-12 18:16:35,806 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-12 18:16:35,806 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-12-12 18:16:35,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-12 18:16:35,811 INFO L85 PathProgramCache]: Analyzing trace with hash 206704716, now seen corresponding path program 1 times [2022-12-12 18:16:35,815 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-12-12 18:16:35,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1221321109] [2022-12-12 18:16:35,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-12 18:16:35,817 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-12 18:16:35,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-12 18:16:35,961 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 18:16:35,961 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-12-12 18:16:35,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1221321109] [2022-12-12 18:16:35,962 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1221321109] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-12 18:16:35,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [138577801] [2022-12-12 18:16:35,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-12 18:16:35,962 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-12 18:16:35,962 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-12-12 18:16:35,965 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-12 18:16:35,982 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-12 18:16:36,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-12 18:16:36,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 3 conjunts are in the unsatisfiable core [2022-12-12 18:16:36,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-12 18:16:36,103 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 18:16:36,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-12 18:16:36,133 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 18:16:36,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [138577801] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-12 18:16:36,134 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-12 18:16:36,134 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-12-12 18:16:36,135 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092865814] [2022-12-12 18:16:36,135 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-12 18:16:36,135 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-12 18:16:36,135 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-12-12 18:16:36,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-12 18:16:36,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2022-12-12 18:16:36,136 INFO L481 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 28 [2022-12-12 18:16:36,137 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 33 places, 44 transitions, 174 flow. Second operand has 7 states, 7 states have (on average 5.714285714285714) internal successors, (40), 7 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-12 18:16:36,137 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-12-12 18:16:36,137 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 28 [2022-12-12 18:16:36,137 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-12-12 18:16:36,413 INFO L130 PetriNetUnfolder]: 913/1399 cut-off events. [2022-12-12 18:16:36,414 INFO L131 PetriNetUnfolder]: For 7/7 co-relation queries the response was YES. [2022-12-12 18:16:36,416 INFO L83 FinitePrefix]: Finished finitePrefix Result has 4178 conditions, 1399 events. 913/1399 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 79. Compared 5992 event pairs, 175 based on Foata normal form. 0/651 useless extension candidates. Maximal degree in co-relation 4165. Up to 1025 conditions per place. [2022-12-12 18:16:36,424 INFO L137 encePairwiseOnDemand]: 25/28 looper letters, 86 selfloop transitions, 5 changer transitions 0/95 dead transitions. [2022-12-12 18:16:36,425 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 38 places, 95 transitions, 560 flow [2022-12-12 18:16:36,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-12 18:16:36,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2022-12-12 18:16:36,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 118 transitions. [2022-12-12 18:16:36,428 INFO L526 CegarLoopForPetriNet]: DFA transition density 0.7023809523809523 [2022-12-12 18:16:36,429 INFO L295 CegarLoopForPetriNet]: 32 programPoint places, 6 predicate places. [2022-12-12 18:16:36,430 INFO L82 GeneralOperation]: Start removeDead. Operand has 38 places, 95 transitions, 560 flow [2022-12-12 18:16:36,440 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 38 places, 95 transitions, 560 flow [2022-12-12 18:16:36,441 INFO L495 AbstractCegarLoop]: Abstraction has has 38 places, 95 transitions, 560 flow [2022-12-12 18:16:36,443 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 5.714285714285714) internal successors, (40), 7 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-12 18:16:36,444 INFO L206 CegarLoopForPetriNet]: Found error trace [2022-12-12 18:16:36,444 INFO L214 CegarLoopForPetriNet]: trace histogram [4, 1, 1, 1, 1, 1, 1] [2022-12-12 18:16:36,455 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-12 18:16:36,653 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-12 18:16:36,654 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-12-12 18:16:36,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-12 18:16:36,655 INFO L85 PathProgramCache]: Analyzing trace with hash -1043870325, now seen corresponding path program 2 times [2022-12-12 18:16:36,655 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-12-12 18:16:36,655 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1257331896] [2022-12-12 18:16:36,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-12 18:16:36,655 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-12 18:16:36,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-12 18:16:36,781 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 18:16:36,781 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-12-12 18:16:36,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1257331896] [2022-12-12 18:16:36,782 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1257331896] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-12 18:16:36,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1611107466] [2022-12-12 18:16:36,783 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-12-12 18:16:36,783 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-12 18:16:36,783 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-12-12 18:16:36,784 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-12 18:16:36,787 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-12 18:16:36,874 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-12-12 18:16:36,874 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-12 18:16:36,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 6 conjunts are in the unsatisfiable core [2022-12-12 18:16:36,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-12 18:16:36,905 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 18:16:36,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-12 18:16:36,957 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 18:16:36,958 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1611107466] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-12 18:16:36,958 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-12 18:16:36,958 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-12-12 18:16:36,958 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787659676] [2022-12-12 18:16:36,959 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-12 18:16:36,959 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-12 18:16:36,959 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-12-12 18:16:36,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-12 18:16:36,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2022-12-12 18:16:36,960 INFO L481 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 28 [2022-12-12 18:16:36,960 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 38 places, 95 transitions, 560 flow. Second operand has 13 states, 13 states have (on average 5.384615384615385) internal successors, (70), 13 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-12 18:16:36,960 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-12-12 18:16:36,960 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 28 [2022-12-12 18:16:36,961 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-12-12 18:16:37,366 INFO L130 PetriNetUnfolder]: 1681/2556 cut-off events. [2022-12-12 18:16:37,366 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2022-12-12 18:16:37,370 INFO L83 FinitePrefix]: Finished finitePrefix Result has 10170 conditions, 2556 events. 1681/2556 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 79. Compared 11035 event pairs, 175 based on Foata normal form. 0/1232 useless extension candidates. Maximal degree in co-relation 10154. Up to 2177 conditions per place. [2022-12-12 18:16:37,388 INFO L137 encePairwiseOnDemand]: 25/28 looper letters, 182 selfloop transitions, 11 changer transitions 0/197 dead transitions. [2022-12-12 18:16:37,388 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 49 places, 197 transitions, 1558 flow [2022-12-12 18:16:37,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-12 18:16:37,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2022-12-12 18:16:37,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 247 transitions. [2022-12-12 18:16:37,394 INFO L526 CegarLoopForPetriNet]: DFA transition density 0.7351190476190477 [2022-12-12 18:16:37,395 INFO L295 CegarLoopForPetriNet]: 32 programPoint places, 17 predicate places. [2022-12-12 18:16:37,396 INFO L82 GeneralOperation]: Start removeDead. Operand has 49 places, 197 transitions, 1558 flow [2022-12-12 18:16:37,416 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 49 places, 197 transitions, 1558 flow [2022-12-12 18:16:37,417 INFO L495 AbstractCegarLoop]: Abstraction has has 49 places, 197 transitions, 1558 flow [2022-12-12 18:16:37,417 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 5.384615384615385) internal successors, (70), 13 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-12 18:16:37,417 INFO L206 CegarLoopForPetriNet]: Found error trace [2022-12-12 18:16:37,417 INFO L214 CegarLoopForPetriNet]: trace histogram [10, 1, 1, 1, 1, 1, 1] [2022-12-12 18:16:37,428 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-12-12 18:16:37,623 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,SelfDestructingSolverStorable2 [2022-12-12 18:16:37,623 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-12-12 18:16:37,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-12 18:16:37,624 INFO L85 PathProgramCache]: Analyzing trace with hash 2052466155, now seen corresponding path program 3 times [2022-12-12 18:16:37,624 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-12-12 18:16:37,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1784972753] [2022-12-12 18:16:37,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-12 18:16:37,624 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-12 18:16:37,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-12 18:16:37,857 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 18:16:37,857 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-12-12 18:16:37,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1784972753] [2022-12-12 18:16:37,857 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1784972753] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-12 18:16:37,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1193339247] [2022-12-12 18:16:37,858 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-12 18:16:37,858 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-12 18:16:37,858 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-12-12 18:16:37,859 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-12 18:16:37,862 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-12 18:16:37,946 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-12 18:16:37,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-12 18:16:37,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-12 18:16:37,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-12 18:16:37,986 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 18:16:37,988 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-12 18:16:38,177 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 18:16:38,177 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1193339247] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-12 18:16:38,177 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-12 18:16:38,177 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2022-12-12 18:16:38,177 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882131052] [2022-12-12 18:16:38,178 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-12 18:16:38,178 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-12 18:16:38,178 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-12-12 18:16:38,179 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-12 18:16:38,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2022-12-12 18:16:38,179 INFO L481 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 28 [2022-12-12 18:16:38,180 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 49 places, 197 transitions, 1558 flow. Second operand has 25 states, 25 states have (on average 5.2) internal successors, (130), 25 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-12 18:16:38,180 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-12-12 18:16:38,180 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 28 [2022-12-12 18:16:38,180 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-12-12 18:16:39,070 INFO L130 PetriNetUnfolder]: 3217/4860 cut-off events. [2022-12-12 18:16:39,070 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2022-12-12 18:16:39,074 INFO L83 FinitePrefix]: Finished finitePrefix Result has 24221 conditions, 4860 events. 3217/4860 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 79. Compared 21030 event pairs, 175 based on Foata normal form. 0/2384 useless extension candidates. Maximal degree in co-relation 24202. Up to 4481 conditions per place. [2022-12-12 18:16:39,117 INFO L137 encePairwiseOnDemand]: 25/28 looper letters, 374 selfloop transitions, 23 changer transitions 0/401 dead transitions. [2022-12-12 18:16:39,117 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 72 places, 401 transitions, 3984 flow [2022-12-12 18:16:39,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-12-12 18:16:39,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2022-12-12 18:16:39,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 505 transitions. [2022-12-12 18:16:39,119 INFO L526 CegarLoopForPetriNet]: DFA transition density 0.7514880952380952 [2022-12-12 18:16:39,121 INFO L295 CegarLoopForPetriNet]: 32 programPoint places, 40 predicate places. [2022-12-12 18:16:39,121 INFO L82 GeneralOperation]: Start removeDead. Operand has 72 places, 401 transitions, 3984 flow [2022-12-12 18:16:39,148 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 72 places, 401 transitions, 3984 flow [2022-12-12 18:16:39,151 INFO L495 AbstractCegarLoop]: Abstraction has has 72 places, 401 transitions, 3984 flow [2022-12-12 18:16:39,151 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 5.2) internal successors, (130), 25 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-12 18:16:39,151 INFO L206 CegarLoopForPetriNet]: Found error trace [2022-12-12 18:16:39,151 INFO L214 CegarLoopForPetriNet]: trace histogram [22, 1, 1, 1, 1, 1, 1] [2022-12-12 18:16:39,156 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-12-12 18:16:39,356 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-12 18:16:39,357 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-12-12 18:16:39,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-12 18:16:39,357 INFO L85 PathProgramCache]: Analyzing trace with hash -637174101, now seen corresponding path program 4 times [2022-12-12 18:16:39,357 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-12-12 18:16:39,357 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [766490786] [2022-12-12 18:16:39,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-12 18:16:39,357 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-12 18:16:39,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-12 18:16:40,767 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 18:16:40,768 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-12-12 18:16:40,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [766490786] [2022-12-12 18:16:40,768 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [766490786] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-12 18:16:40,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [542660777] [2022-12-12 18:16:40,768 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-12 18:16:40,769 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-12 18:16:40,769 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-12-12 18:16:40,772 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-12 18:16:40,796 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-12 18:16:40,871 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-12 18:16:40,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-12 18:16:40,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 74 conjunts are in the unsatisfiable core [2022-12-12 18:16:40,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-12 18:16:41,970 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 210 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 18:16:41,971 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-12 18:16:43,466 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 18:16:43,467 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [542660777] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-12 18:16:43,467 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-12 18:16:43,467 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 69 [2022-12-12 18:16:43,467 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904068186] [2022-12-12 18:16:43,467 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-12 18:16:43,468 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2022-12-12 18:16:43,468 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-12-12 18:16:43,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2022-12-12 18:16:43,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=895, Invalid=4075, Unknown=0, NotChecked=0, Total=4970 [2022-12-12 18:16:43,470 INFO L481 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 28 [2022-12-12 18:16:43,471 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 72 places, 401 transitions, 3984 flow. Second operand has 71 states, 71 states have (on average 5.183098591549296) internal successors, (368), 71 states have internal predecessors, (368), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-12 18:16:43,471 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-12-12 18:16:43,471 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 28 [2022-12-12 18:16:43,471 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand