./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/pthread-lit/sssc12_variant.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version cf1a7837 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7220eb1-2d7c-4cb0-8839-ef0e162676dc/bin/uautomizer-verify-uTZkv6EMXl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7220eb1-2d7c-4cb0-8839-ef0e162676dc/bin/uautomizer-verify-uTZkv6EMXl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7220eb1-2d7c-4cb0-8839-ef0e162676dc/bin/uautomizer-verify-uTZkv6EMXl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7220eb1-2d7c-4cb0-8839-ef0e162676dc/bin/uautomizer-verify-uTZkv6EMXl/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/pthread-lit/sssc12_variant.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7220eb1-2d7c-4cb0-8839-ef0e162676dc/bin/uautomizer-verify-uTZkv6EMXl/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7220eb1-2d7c-4cb0-8839-ef0e162676dc/bin/uautomizer-verify-uTZkv6EMXl --witnessprinter.witness.filename witness --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 726fce4da80b267da781dea82372ef1c43891e7d5d6ac2b3894c611bc25a242b --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 02:23:09,609 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 02:23:09,753 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7220eb1-2d7c-4cb0-8839-ef0e162676dc/bin/uautomizer-verify-uTZkv6EMXl/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2023-11-12 02:23:09,763 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 02:23:09,764 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 02:23:09,807 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 02:23:09,808 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 02:23:09,809 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 02:23:09,810 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 02:23:09,815 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 02:23:09,817 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-12 02:23:09,818 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-12 02:23:09,818 INFO L153 SettingsManager]: * Use SBE=true [2023-11-12 02:23:09,820 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 02:23:09,821 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 02:23:09,821 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 02:23:09,822 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 02:23:09,822 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 02:23:09,823 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-12 02:23:09,823 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-12 02:23:09,824 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-12 02:23:09,824 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 02:23:09,825 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-12 02:23:09,827 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-12 02:23:09,827 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 02:23:09,828 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 02:23:09,829 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 02:23:09,829 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-12 02:23:09,830 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 02:23:09,830 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 02:23:09,832 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 02:23:09,833 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 02:23:09,833 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-12 02:23:09,833 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 02:23:09,834 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-12 02:23:09,834 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-12 02:23:09,834 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 02:23:09,835 INFO L153 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-11-12 02:23:09,835 INFO L153 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:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7220eb1-2d7c-4cb0-8839-ef0e162676dc/bin/uautomizer-verify-uTZkv6EMXl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7220eb1-2d7c-4cb0-8839-ef0e162676dc/bin/uautomizer-verify-uTZkv6EMXl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 726fce4da80b267da781dea82372ef1c43891e7d5d6ac2b3894c611bc25a242b [2023-11-12 02:23:10,202 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 02:23:10,238 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 02:23:10,242 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 02:23:10,243 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 02:23:10,244 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 02:23:10,246 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7220eb1-2d7c-4cb0-8839-ef0e162676dc/bin/uautomizer-verify-uTZkv6EMXl/../../sv-benchmarks/c/pthread-lit/sssc12_variant.i [2023-11-12 02:23:13,447 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 02:23:13,860 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 02:23:13,861 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7220eb1-2d7c-4cb0-8839-ef0e162676dc/sv-benchmarks/c/pthread-lit/sssc12_variant.i [2023-11-12 02:23:13,890 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7220eb1-2d7c-4cb0-8839-ef0e162676dc/bin/uautomizer-verify-uTZkv6EMXl/data/ca665cccd/ec97236b1381402289c9ca21171ad73a/FLAGb852c8e46 [2023-11-12 02:23:13,904 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7220eb1-2d7c-4cb0-8839-ef0e162676dc/bin/uautomizer-verify-uTZkv6EMXl/data/ca665cccd/ec97236b1381402289c9ca21171ad73a [2023-11-12 02:23:13,907 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 02:23:13,909 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 02:23:13,910 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 02:23:13,911 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 02:23:13,924 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 02:23:13,926 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 02:23:13" (1/1) ... [2023-11-12 02:23:13,927 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ebfb9fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:23:13, skipping insertion in model container [2023-11-12 02:23:13,928 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 02:23:13" (1/1) ... [2023-11-12 02:23:14,004 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 02:23:14,631 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 02:23:14,645 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 02:23:14,716 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 02:23:14,810 WARN L672 CHandler]: The function __VERIFIER_atomic_begin is called, but not defined or handled by StandardFunctionHandler. [2023-11-12 02:23:14,810 WARN L672 CHandler]: The function __VERIFIER_atomic_end is called, but not defined or handled by StandardFunctionHandler. [2023-11-12 02:23:14,819 INFO L206 MainTranslator]: Completed translation [2023-11-12 02:23:14,819 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:23:14 WrapperNode [2023-11-12 02:23:14,820 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 02:23:14,821 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 02:23:14,821 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 02:23:14,821 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 02:23:14,829 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:23:14" (1/1) ... [2023-11-12 02:23:14,853 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:23:14" (1/1) ... [2023-11-12 02:23:14,888 INFO L138 Inliner]: procedures = 275, calls = 26, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 90 [2023-11-12 02:23:14,888 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 02:23:14,889 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 02:23:14,889 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 02:23:14,889 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 02:23:14,905 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:23:14" (1/1) ... [2023-11-12 02:23:14,906 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:23:14" (1/1) ... [2023-11-12 02:23:14,910 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:23:14" (1/1) ... [2023-11-12 02:23:14,910 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:23:14" (1/1) ... [2023-11-12 02:23:14,918 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:23:14" (1/1) ... [2023-11-12 02:23:14,922 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:23:14" (1/1) ... [2023-11-12 02:23:14,924 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:23:14" (1/1) ... [2023-11-12 02:23:14,932 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:23:14" (1/1) ... [2023-11-12 02:23:14,936 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 02:23:14,937 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 02:23:14,937 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 02:23:14,937 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 02:23:14,938 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:23:14" (1/1) ... [2023-11-12 02:23:14,953 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 02:23:14,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7220eb1-2d7c-4cb0-8839-ef0e162676dc/bin/uautomizer-verify-uTZkv6EMXl/z3 [2023-11-12 02:23:14,989 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7220eb1-2d7c-4cb0-8839-ef0e162676dc/bin/uautomizer-verify-uTZkv6EMXl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 02:23:14,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7220eb1-2d7c-4cb0-8839-ef0e162676dc/bin/uautomizer-verify-uTZkv6EMXl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 02:23:15,030 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2023-11-12 02:23:15,031 INFO L130 BoogieDeclarations]: Found specification of procedure thr [2023-11-12 02:23:15,031 INFO L138 BoogieDeclarations]: Found implementation of procedure thr [2023-11-12 02:23:15,032 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-12 02:23:15,033 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-12 02:23:15,033 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2023-11-12 02:23:15,033 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-12 02:23:15,033 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-12 02:23:15,034 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-12 02:23:15,034 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 02:23:15,034 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 02:23:15,035 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 02:23:15,035 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 02:23:15,037 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-11-12 02:23:15,193 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 02:23:15,195 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 02:23:15,476 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 02:23:15,540 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 02:23:15,540 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-12 02:23:15,543 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 02:23:15 BoogieIcfgContainer [2023-11-12 02:23:15,543 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 02:23:15,546 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 02:23:15,546 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 02:23:15,550 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 02:23:15,550 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 02:23:13" (1/3) ... [2023-11-12 02:23:15,551 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a89762f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 02:23:15, skipping insertion in model container [2023-11-12 02:23:15,552 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:23:14" (2/3) ... [2023-11-12 02:23:15,552 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a89762f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 02:23:15, skipping insertion in model container [2023-11-12 02:23:15,552 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 02:23:15" (3/3) ... [2023-11-12 02:23:15,554 INFO L112 eAbstractionObserver]: Analyzing ICFG sssc12_variant.i [2023-11-12 02:23:15,574 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 02:23:15,575 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 10 error locations. [2023-11-12 02:23:15,575 INFO L521 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-11-12 02:23:15,649 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-11-12 02:23:15,691 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 98 places, 102 transitions, 208 flow [2023-11-12 02:23:15,751 INFO L124 PetriNetUnfolderBase]: 8/120 cut-off events. [2023-11-12 02:23:15,751 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-12 02:23:15,757 INFO L83 FinitePrefix]: Finished finitePrefix Result has 124 conditions, 120 events. 8/120 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 181 event pairs, 0 based on Foata normal form. 0/97 useless extension candidates. Maximal degree in co-relation 66. Up to 4 conditions per place. [2023-11-12 02:23:15,758 INFO L82 GeneralOperation]: Start removeDead. Operand has 98 places, 102 transitions, 208 flow [2023-11-12 02:23:15,763 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 98 places, 102 transitions, 208 flow [2023-11-12 02:23:15,767 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-11-12 02:23:15,779 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 98 places, 102 transitions, 208 flow [2023-11-12 02:23:15,787 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 98 places, 102 transitions, 208 flow [2023-11-12 02:23:15,788 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 98 places, 102 transitions, 208 flow [2023-11-12 02:23:15,825 INFO L124 PetriNetUnfolderBase]: 8/120 cut-off events. [2023-11-12 02:23:15,825 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-12 02:23:15,827 INFO L83 FinitePrefix]: Finished finitePrefix Result has 124 conditions, 120 events. 8/120 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 181 event pairs, 0 based on Foata normal form. 0/97 useless extension candidates. Maximal degree in co-relation 66. Up to 4 conditions per place. [2023-11-12 02:23:15,830 INFO L119 LiptonReduction]: Number of co-enabled transitions 1932 [2023-11-12 02:23:19,958 INFO L134 LiptonReduction]: Checked pairs total: 2939 [2023-11-12 02:23:19,958 INFO L136 LiptonReduction]: Total number of compositions: 109 [2023-11-12 02:23:19,975 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 02:23:19,988 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;@55f283ae, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-11-12 02:23:19,989 INFO L358 AbstractCegarLoop]: Starting to check reachability of 18 error locations. [2023-11-12 02:23:19,993 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-11-12 02:23:19,993 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-11-12 02:23:19,993 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-12 02:23:19,994 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:23:19,994 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-11-12 02:23:19,995 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_LEAK (and 15 more)] === [2023-11-12 02:23:20,001 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:23:20,001 INFO L85 PathProgramCache]: Analyzing trace with hash 14937, now seen corresponding path program 1 times [2023-11-12 02:23:20,011 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:23:20,012 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [470632704] [2023-11-12 02:23:20,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:23:20,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:23:20,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:23:20,413 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:23:20,426 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:23:20,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [470632704] [2023-11-12 02:23:20,428 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [470632704] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:23:20,428 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:23:20,428 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 02:23:20,430 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719482152] [2023-11-12 02:23:20,431 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:23:20,440 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 02:23:20,448 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:23:20,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 02:23:20,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 02:23:20,547 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 86 out of 211 [2023-11-12 02:23:20,553 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 23 places, 21 transitions, 46 flow. Second operand has 3 states, 3 states have (on average 86.66666666666667) internal successors, (260), 3 states have internal predecessors, (260), 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) [2023-11-12 02:23:20,553 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:23:20,553 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 86 of 211 [2023-11-12 02:23:20,555 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:23:20,630 INFO L124 PetriNetUnfolderBase]: 22/67 cut-off events. [2023-11-12 02:23:20,630 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-12 02:23:20,631 INFO L83 FinitePrefix]: Finished finitePrefix Result has 125 conditions, 67 events. 22/67 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 16. Compared 230 event pairs, 18 based on Foata normal form. 4/43 useless extension candidates. Maximal degree in co-relation 110. Up to 53 conditions per place. [2023-11-12 02:23:20,635 INFO L140 encePairwiseOnDemand]: 205/211 looper letters, 11 selfloop transitions, 1 changer transitions 0/16 dead transitions. [2023-11-12 02:23:20,635 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 20 places, 16 transitions, 60 flow [2023-11-12 02:23:20,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 02:23:20,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-12 02:23:20,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 275 transitions. [2023-11-12 02:23:20,663 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4344391785150079 [2023-11-12 02:23:20,665 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 275 transitions. [2023-11-12 02:23:20,666 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 275 transitions. [2023-11-12 02:23:20,670 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:23:20,673 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 275 transitions. [2023-11-12 02:23:20,681 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 91.66666666666667) internal successors, (275), 3 states have internal predecessors, (275), 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) [2023-11-12 02:23:20,686 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 211.0) internal successors, (844), 4 states have internal predecessors, (844), 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) [2023-11-12 02:23:20,687 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 211.0) internal successors, (844), 4 states have internal predecessors, (844), 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) [2023-11-12 02:23:20,689 INFO L175 Difference]: Start difference. First operand has 23 places, 21 transitions, 46 flow. Second operand 3 states and 275 transitions. [2023-11-12 02:23:20,691 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 20 places, 16 transitions, 60 flow [2023-11-12 02:23:20,693 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 20 places, 16 transitions, 60 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-11-12 02:23:20,695 INFO L231 Difference]: Finished difference. Result has 20 places, 16 transitions, 38 flow [2023-11-12 02:23:20,697 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=211, PETRI_DIFFERENCE_MINUEND_FLOW=36, PETRI_DIFFERENCE_MINUEND_PLACES=18, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=16, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=15, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=38, PETRI_PLACES=20, PETRI_TRANSITIONS=16} [2023-11-12 02:23:20,702 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, -3 predicate places. [2023-11-12 02:23:20,703 INFO L495 AbstractCegarLoop]: Abstraction has has 20 places, 16 transitions, 38 flow [2023-11-12 02:23:20,703 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 86.66666666666667) internal successors, (260), 3 states have internal predecessors, (260), 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) [2023-11-12 02:23:20,703 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:23:20,704 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-11-12 02:23:20,704 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 02:23:20,705 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_LEAK (and 15 more)] === [2023-11-12 02:23:20,705 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:23:20,706 INFO L85 PathProgramCache]: Analyzing trace with hash 14935, now seen corresponding path program 1 times [2023-11-12 02:23:20,706 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:23:20,706 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [753174919] [2023-11-12 02:23:20,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:23:20,707 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:23:20,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:23:20,897 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:23:20,898 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:23:20,898 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [753174919] [2023-11-12 02:23:20,899 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [753174919] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:23:20,899 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:23:20,899 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 02:23:20,899 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [676210431] [2023-11-12 02:23:20,900 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:23:20,901 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 02:23:20,901 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:23:20,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 02:23:20,902 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 02:23:20,952 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 85 out of 211 [2023-11-12 02:23:20,953 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 20 places, 16 transitions, 38 flow. Second operand has 3 states, 3 states have (on average 85.66666666666667) internal successors, (257), 3 states have internal predecessors, (257), 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) [2023-11-12 02:23:20,953 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:23:20,953 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 85 of 211 [2023-11-12 02:23:20,954 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:23:20,998 INFO L124 PetriNetUnfolderBase]: 15/49 cut-off events. [2023-11-12 02:23:20,998 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-12 02:23:20,999 INFO L83 FinitePrefix]: Finished finitePrefix Result has 94 conditions, 49 events. 15/49 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 146 event pairs, 12 based on Foata normal form. 0/34 useless extension candidates. Maximal degree in co-relation 87. Up to 38 conditions per place. [2023-11-12 02:23:20,999 INFO L140 encePairwiseOnDemand]: 209/211 looper letters, 10 selfloop transitions, 1 changer transitions 0/15 dead transitions. [2023-11-12 02:23:21,000 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 21 places, 15 transitions, 58 flow [2023-11-12 02:23:21,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 02:23:21,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-12 02:23:21,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 267 transitions. [2023-11-12 02:23:21,002 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4218009478672986 [2023-11-12 02:23:21,003 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 267 transitions. [2023-11-12 02:23:21,003 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 267 transitions. [2023-11-12 02:23:21,003 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:23:21,003 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 267 transitions. [2023-11-12 02:23:21,005 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 89.0) internal successors, (267), 3 states have internal predecessors, (267), 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) [2023-11-12 02:23:21,007 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 211.0) internal successors, (844), 4 states have internal predecessors, (844), 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) [2023-11-12 02:23:21,008 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 211.0) internal successors, (844), 4 states have internal predecessors, (844), 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) [2023-11-12 02:23:21,009 INFO L175 Difference]: Start difference. First operand has 20 places, 16 transitions, 38 flow. Second operand 3 states and 267 transitions. [2023-11-12 02:23:21,009 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 21 places, 15 transitions, 58 flow [2023-11-12 02:23:21,009 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 20 places, 15 transitions, 57 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-11-12 02:23:21,010 INFO L231 Difference]: Finished difference. Result has 20 places, 15 transitions, 37 flow [2023-11-12 02:23:21,010 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=211, PETRI_DIFFERENCE_MINUEND_FLOW=35, PETRI_DIFFERENCE_MINUEND_PLACES=18, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=15, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=14, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=37, PETRI_PLACES=20, PETRI_TRANSITIONS=15} [2023-11-12 02:23:21,011 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, -3 predicate places. [2023-11-12 02:23:21,012 INFO L495 AbstractCegarLoop]: Abstraction has has 20 places, 15 transitions, 37 flow [2023-11-12 02:23:21,012 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 85.66666666666667) internal successors, (257), 3 states have internal predecessors, (257), 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) [2023-11-12 02:23:21,012 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:23:21,012 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-11-12 02:23:21,013 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-12 02:23:21,013 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting thrErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_LEAK (and 15 more)] === [2023-11-12 02:23:21,014 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:23:21,014 INFO L85 PathProgramCache]: Analyzing trace with hash 445288429, now seen corresponding path program 1 times [2023-11-12 02:23:21,014 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:23:21,014 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1201442630] [2023-11-12 02:23:21,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:23:21,015 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:23:21,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:23:21,449 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:23:21,450 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:23:21,450 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1201442630] [2023-11-12 02:23:21,451 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1201442630] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:23:21,452 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:23:21,453 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 02:23:21,454 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [614685176] [2023-11-12 02:23:21,454 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:23:21,454 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 02:23:21,455 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:23:21,455 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 02:23:21,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 02:23:21,591 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 81 out of 211 [2023-11-12 02:23:21,592 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 20 places, 15 transitions, 37 flow. Second operand has 4 states, 4 states have (on average 82.25) internal successors, (329), 4 states have internal predecessors, (329), 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) [2023-11-12 02:23:21,592 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:23:21,592 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 81 of 211 [2023-11-12 02:23:21,593 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:23:21,657 INFO L124 PetriNetUnfolderBase]: 25/82 cut-off events. [2023-11-12 02:23:21,658 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-12 02:23:21,658 INFO L83 FinitePrefix]: Finished finitePrefix Result has 153 conditions, 82 events. 25/82 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 272 event pairs, 0 based on Foata normal form. 0/55 useless extension candidates. Maximal degree in co-relation 145. Up to 34 conditions per place. [2023-11-12 02:23:21,659 INFO L140 encePairwiseOnDemand]: 207/211 looper letters, 17 selfloop transitions, 3 changer transitions 0/24 dead transitions. [2023-11-12 02:23:21,659 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 23 places, 24 transitions, 95 flow [2023-11-12 02:23:21,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 02:23:21,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-11-12 02:23:21,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 345 transitions. [2023-11-12 02:23:21,662 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4087677725118483 [2023-11-12 02:23:21,662 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 345 transitions. [2023-11-12 02:23:21,662 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 345 transitions. [2023-11-12 02:23:21,663 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:23:21,663 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 345 transitions. [2023-11-12 02:23:21,664 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 86.25) internal successors, (345), 4 states have internal predecessors, (345), 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) [2023-11-12 02:23:21,668 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 211.0) internal successors, (1055), 5 states have internal predecessors, (1055), 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) [2023-11-12 02:23:21,669 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 211.0) internal successors, (1055), 5 states have internal predecessors, (1055), 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) [2023-11-12 02:23:21,669 INFO L175 Difference]: Start difference. First operand has 20 places, 15 transitions, 37 flow. Second operand 4 states and 345 transitions. [2023-11-12 02:23:21,669 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 23 places, 24 transitions, 95 flow [2023-11-12 02:23:21,670 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 22 places, 24 transitions, 94 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-11-12 02:23:21,670 INFO L231 Difference]: Finished difference. Result has 23 places, 16 transitions, 50 flow [2023-11-12 02:23:21,671 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=211, PETRI_DIFFERENCE_MINUEND_FLOW=36, PETRI_DIFFERENCE_MINUEND_PLACES=19, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=15, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=12, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=50, PETRI_PLACES=23, PETRI_TRANSITIONS=16} [2023-11-12 02:23:21,672 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, 0 predicate places. [2023-11-12 02:23:21,672 INFO L495 AbstractCegarLoop]: Abstraction has has 23 places, 16 transitions, 50 flow [2023-11-12 02:23:21,672 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 82.25) internal successors, (329), 4 states have internal predecessors, (329), 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) [2023-11-12 02:23:21,672 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:23:21,673 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-11-12 02:23:21,673 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-12 02:23:21,673 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting thrErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_LEAK (and 15 more)] === [2023-11-12 02:23:21,674 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:23:21,674 INFO L85 PathProgramCache]: Analyzing trace with hash 445288428, now seen corresponding path program 1 times [2023-11-12 02:23:21,674 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:23:21,674 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [127443] [2023-11-12 02:23:21,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:23:21,675 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:23:21,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:23:21,756 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:23:21,756 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:23:21,756 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [127443] [2023-11-12 02:23:21,757 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [127443] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:23:21,757 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:23:21,757 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 02:23:21,757 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1222548118] [2023-11-12 02:23:21,757 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:23:21,758 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 02:23:21,758 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:23:21,758 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 02:23:21,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 02:23:21,810 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 83 out of 211 [2023-11-12 02:23:21,811 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 23 places, 16 transitions, 50 flow. Second operand has 3 states, 3 states have (on average 84.66666666666667) internal successors, (254), 3 states have internal predecessors, (254), 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) [2023-11-12 02:23:21,811 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:23:21,811 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 83 of 211 [2023-11-12 02:23:21,812 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:23:21,855 INFO L124 PetriNetUnfolderBase]: 25/65 cut-off events. [2023-11-12 02:23:21,856 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-11-12 02:23:21,856 INFO L83 FinitePrefix]: Finished finitePrefix Result has 153 conditions, 65 events. 25/65 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 157 event pairs, 22 based on Foata normal form. 0/59 useless extension candidates. Maximal degree in co-relation 143. Up to 63 conditions per place. [2023-11-12 02:23:21,857 INFO L140 encePairwiseOnDemand]: 207/211 looper letters, 11 selfloop transitions, 1 changer transitions 0/13 dead transitions. [2023-11-12 02:23:21,857 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 22 places, 13 transitions, 68 flow [2023-11-12 02:23:21,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 02:23:21,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-12 02:23:21,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 263 transitions. [2023-11-12 02:23:21,862 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4154818325434439 [2023-11-12 02:23:21,862 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 263 transitions. [2023-11-12 02:23:21,862 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 263 transitions. [2023-11-12 02:23:21,862 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:23:21,863 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 263 transitions. [2023-11-12 02:23:21,864 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 87.66666666666667) internal successors, (263), 3 states have internal predecessors, (263), 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) [2023-11-12 02:23:21,866 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 211.0) internal successors, (844), 4 states have internal predecessors, (844), 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) [2023-11-12 02:23:21,867 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 211.0) internal successors, (844), 4 states have internal predecessors, (844), 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) [2023-11-12 02:23:21,867 INFO L175 Difference]: Start difference. First operand has 23 places, 16 transitions, 50 flow. Second operand 3 states and 263 transitions. [2023-11-12 02:23:21,867 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 22 places, 13 transitions, 68 flow [2023-11-12 02:23:21,867 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 20 places, 13 transitions, 64 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-11-12 02:23:21,868 INFO L231 Difference]: Finished difference. Result has 20 places, 13 transitions, 42 flow [2023-11-12 02:23:21,868 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=211, PETRI_DIFFERENCE_MINUEND_FLOW=40, PETRI_DIFFERENCE_MINUEND_PLACES=18, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=13, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=12, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=42, PETRI_PLACES=20, PETRI_TRANSITIONS=13} [2023-11-12 02:23:21,869 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, -3 predicate places. [2023-11-12 02:23:21,869 INFO L495 AbstractCegarLoop]: Abstraction has has 20 places, 13 transitions, 42 flow [2023-11-12 02:23:21,870 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 84.66666666666667) internal successors, (254), 3 states have internal predecessors, (254), 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) [2023-11-12 02:23:21,870 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:23:21,870 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-11-12 02:23:21,870 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-12 02:23:21,871 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_LEAK (and 15 more)] === [2023-11-12 02:23:21,871 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:23:21,871 INFO L85 PathProgramCache]: Analyzing trace with hash 918944538, now seen corresponding path program 1 times [2023-11-12 02:23:21,871 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:23:21,872 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [180459075] [2023-11-12 02:23:21,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:23:21,872 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:23:21,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-11-12 02:23:21,889 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-11-12 02:23:21,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-11-12 02:23:21,935 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-11-12 02:23:21,935 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-11-12 02:23:21,937 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (17 of 18 remaining) [2023-11-12 02:23:21,939 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (16 of 18 remaining) [2023-11-12 02:23:21,939 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (15 of 18 remaining) [2023-11-12 02:23:21,940 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_LEAK (14 of 18 remaining) [2023-11-12 02:23:21,943 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (13 of 18 remaining) [2023-11-12 02:23:21,944 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (12 of 18 remaining) [2023-11-12 02:23:21,944 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (11 of 18 remaining) [2023-11-12 02:23:21,944 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (10 of 18 remaining) [2023-11-12 02:23:21,944 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (9 of 18 remaining) [2023-11-12 02:23:21,944 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 18 remaining) [2023-11-12 02:23:21,945 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr6ASSERT_VIOLATIONMEMORY_LEAK (7 of 18 remaining) [2023-11-12 02:23:21,945 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 18 remaining) [2023-11-12 02:23:21,945 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 18 remaining) [2023-11-12 02:23:21,952 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 18 remaining) [2023-11-12 02:23:21,952 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 18 remaining) [2023-11-12 02:23:21,953 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 18 remaining) [2023-11-12 02:23:21,953 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 18 remaining) [2023-11-12 02:23:21,957 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr6ASSERT_VIOLATIONMEMORY_LEAK (0 of 18 remaining) [2023-11-12 02:23:21,957 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-12 02:23:21,958 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1] [2023-11-12 02:23:21,961 WARN L234 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-11-12 02:23:21,961 INFO L521 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-11-12 02:23:22,032 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-11-12 02:23:22,041 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 142 places, 149 transitions, 308 flow [2023-11-12 02:23:22,086 INFO L124 PetriNetUnfolderBase]: 14/187 cut-off events. [2023-11-12 02:23:22,087 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-11-12 02:23:22,092 INFO L83 FinitePrefix]: Finished finitePrefix Result has 195 conditions, 187 events. 14/187 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 487 event pairs, 0 based on Foata normal form. 0/147 useless extension candidates. Maximal degree in co-relation 121. Up to 6 conditions per place. [2023-11-12 02:23:22,092 INFO L82 GeneralOperation]: Start removeDead. Operand has 142 places, 149 transitions, 308 flow [2023-11-12 02:23:22,095 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 142 places, 149 transitions, 308 flow [2023-11-12 02:23:22,096 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-11-12 02:23:22,096 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 142 places, 149 transitions, 308 flow [2023-11-12 02:23:22,096 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 142 places, 149 transitions, 308 flow [2023-11-12 02:23:22,096 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 142 places, 149 transitions, 308 flow [2023-11-12 02:23:22,130 INFO L124 PetriNetUnfolderBase]: 14/187 cut-off events. [2023-11-12 02:23:22,130 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-11-12 02:23:22,131 INFO L83 FinitePrefix]: Finished finitePrefix Result has 195 conditions, 187 events. 14/187 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 487 event pairs, 0 based on Foata normal form. 0/147 useless extension candidates. Maximal degree in co-relation 121. Up to 6 conditions per place. [2023-11-12 02:23:22,140 INFO L119 LiptonReduction]: Number of co-enabled transitions 8188 [2023-11-12 02:23:26,398 INFO L134 LiptonReduction]: Checked pairs total: 22255 [2023-11-12 02:23:26,399 INFO L136 LiptonReduction]: Total number of compositions: 151 [2023-11-12 02:23:26,401 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 02:23:26,402 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;@55f283ae, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-11-12 02:23:26,402 INFO L358 AbstractCegarLoop]: Starting to check reachability of 25 error locations. [2023-11-12 02:23:26,404 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-11-12 02:23:26,404 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-11-12 02:23:26,404 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-12 02:23:26,404 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:23:26,404 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-11-12 02:23:26,404 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_LEAK (and 22 more)] === [2023-11-12 02:23:26,405 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:23:26,405 INFO L85 PathProgramCache]: Analyzing trace with hash 25994, now seen corresponding path program 1 times [2023-11-12 02:23:26,405 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:23:26,405 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [110287360] [2023-11-12 02:23:26,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:23:26,406 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:23:26,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:23:26,457 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:23:26,457 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:23:26,457 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [110287360] [2023-11-12 02:23:26,462 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [110287360] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:23:26,462 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:23:26,463 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 02:23:26,463 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820641921] [2023-11-12 02:23:26,463 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:23:26,463 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 02:23:26,463 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:23:26,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 02:23:26,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 02:23:26,519 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 125 out of 300 [2023-11-12 02:23:26,520 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 48 places, 49 transitions, 108 flow. Second operand has 3 states, 3 states have (on average 125.66666666666667) internal successors, (377), 3 states have internal predecessors, (377), 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) [2023-11-12 02:23:26,521 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:23:26,521 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 125 of 300 [2023-11-12 02:23:26,521 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:23:26,719 INFO L124 PetriNetUnfolderBase]: 594/1118 cut-off events. [2023-11-12 02:23:26,719 INFO L125 PetriNetUnfolderBase]: For 33/33 co-relation queries the response was YES. [2023-11-12 02:23:26,721 INFO L83 FinitePrefix]: Finished finitePrefix Result has 2081 conditions, 1118 events. 594/1118 cut-off events. For 33/33 co-relation queries the response was YES. Maximal size of possible extension queue 129. Compared 7029 event pairs, 468 based on Foata normal form. 63/705 useless extension candidates. Maximal degree in co-relation 1097. Up to 927 conditions per place. [2023-11-12 02:23:26,730 INFO L140 encePairwiseOnDemand]: 290/300 looper letters, 26 selfloop transitions, 1 changer transitions 0/40 dead transitions. [2023-11-12 02:23:26,730 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 43 places, 40 transitions, 144 flow [2023-11-12 02:23:26,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 02:23:26,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-12 02:23:26,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 411 transitions. [2023-11-12 02:23:26,733 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.45666666666666667 [2023-11-12 02:23:26,733 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 411 transitions. [2023-11-12 02:23:26,733 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 411 transitions. [2023-11-12 02:23:26,733 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:23:26,734 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 411 transitions. [2023-11-12 02:23:26,735 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 137.0) internal successors, (411), 3 states have internal predecessors, (411), 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) [2023-11-12 02:23:26,764 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 300.0) internal successors, (1200), 4 states have internal predecessors, (1200), 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) [2023-11-12 02:23:26,765 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 300.0) internal successors, (1200), 4 states have internal predecessors, (1200), 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) [2023-11-12 02:23:26,766 INFO L175 Difference]: Start difference. First operand has 48 places, 49 transitions, 108 flow. Second operand 3 states and 411 transitions. [2023-11-12 02:23:26,766 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 43 places, 40 transitions, 144 flow [2023-11-12 02:23:26,767 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 43 places, 40 transitions, 144 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-11-12 02:23:26,768 INFO L231 Difference]: Finished difference. Result has 43 places, 40 transitions, 92 flow [2023-11-12 02:23:26,769 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=300, PETRI_DIFFERENCE_MINUEND_FLOW=90, PETRI_DIFFERENCE_MINUEND_PLACES=41, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=40, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=39, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=92, PETRI_PLACES=43, PETRI_TRANSITIONS=40} [2023-11-12 02:23:26,773 INFO L281 CegarLoopForPetriNet]: 48 programPoint places, -5 predicate places. [2023-11-12 02:23:26,773 INFO L495 AbstractCegarLoop]: Abstraction has has 43 places, 40 transitions, 92 flow [2023-11-12 02:23:26,773 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 125.66666666666667) internal successors, (377), 3 states have internal predecessors, (377), 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) [2023-11-12 02:23:26,773 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:23:26,774 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-11-12 02:23:26,774 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-12 02:23:26,774 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_LEAK (and 22 more)] === [2023-11-12 02:23:26,774 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:23:26,775 INFO L85 PathProgramCache]: Analyzing trace with hash 25995, now seen corresponding path program 1 times [2023-11-12 02:23:26,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:23:26,775 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [92226423] [2023-11-12 02:23:26,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:23:26,775 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:23:26,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:23:26,850 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:23:26,850 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:23:26,852 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [92226423] [2023-11-12 02:23:26,852 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [92226423] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:23:26,854 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:23:26,854 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 02:23:26,855 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410144762] [2023-11-12 02:23:26,855 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:23:26,855 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 02:23:26,855 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:23:26,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 02:23:26,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 02:23:26,905 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 126 out of 300 [2023-11-12 02:23:26,906 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 43 places, 40 transitions, 92 flow. Second operand has 3 states, 3 states have (on average 126.66666666666667) internal successors, (380), 3 states have internal predecessors, (380), 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) [2023-11-12 02:23:26,906 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:23:26,906 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 126 of 300 [2023-11-12 02:23:26,906 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:23:27,040 INFO L124 PetriNetUnfolderBase]: 363/718 cut-off events. [2023-11-12 02:23:27,041 INFO L125 PetriNetUnfolderBase]: For 33/33 co-relation queries the response was YES. [2023-11-12 02:23:27,042 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1341 conditions, 718 events. 363/718 cut-off events. For 33/33 co-relation queries the response was YES. Maximal size of possible extension queue 79. Compared 4103 event pairs, 279 based on Foata normal form. 0/471 useless extension candidates. Maximal degree in co-relation 1333. Up to 585 conditions per place. [2023-11-12 02:23:27,048 INFO L140 encePairwiseOnDemand]: 298/300 looper letters, 25 selfloop transitions, 1 changer transitions 0/39 dead transitions. [2023-11-12 02:23:27,048 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 44 places, 39 transitions, 142 flow [2023-11-12 02:23:27,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 02:23:27,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-12 02:23:27,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 405 transitions. [2023-11-12 02:23:27,054 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.45 [2023-11-12 02:23:27,054 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 405 transitions. [2023-11-12 02:23:27,054 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 405 transitions. [2023-11-12 02:23:27,055 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:23:27,055 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 405 transitions. [2023-11-12 02:23:27,056 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 135.0) internal successors, (405), 3 states have internal predecessors, (405), 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) [2023-11-12 02:23:27,059 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 300.0) internal successors, (1200), 4 states have internal predecessors, (1200), 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) [2023-11-12 02:23:27,060 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 300.0) internal successors, (1200), 4 states have internal predecessors, (1200), 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) [2023-11-12 02:23:27,062 INFO L175 Difference]: Start difference. First operand has 43 places, 40 transitions, 92 flow. Second operand 3 states and 405 transitions. [2023-11-12 02:23:27,062 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 44 places, 39 transitions, 142 flow [2023-11-12 02:23:27,064 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 43 places, 39 transitions, 141 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-11-12 02:23:27,066 INFO L231 Difference]: Finished difference. Result has 43 places, 39 transitions, 91 flow [2023-11-12 02:23:27,066 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=300, PETRI_DIFFERENCE_MINUEND_FLOW=89, PETRI_DIFFERENCE_MINUEND_PLACES=41, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=39, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=38, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=91, PETRI_PLACES=43, PETRI_TRANSITIONS=39} [2023-11-12 02:23:27,068 INFO L281 CegarLoopForPetriNet]: 48 programPoint places, -5 predicate places. [2023-11-12 02:23:27,068 INFO L495 AbstractCegarLoop]: Abstraction has has 43 places, 39 transitions, 91 flow [2023-11-12 02:23:27,069 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 126.66666666666667) internal successors, (380), 3 states have internal predecessors, (380), 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) [2023-11-12 02:23:27,069 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:23:27,069 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:23:27,069 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-12 02:23:27,069 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting thrErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_LEAK (and 22 more)] === [2023-11-12 02:23:27,070 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:23:27,070 INFO L85 PathProgramCache]: Analyzing trace with hash 1735802597, now seen corresponding path program 1 times [2023-11-12 02:23:27,070 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:23:27,070 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1111536573] [2023-11-12 02:23:27,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:23:27,070 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:23:27,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:23:27,138 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:23:27,138 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:23:27,138 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1111536573] [2023-11-12 02:23:27,139 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1111536573] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:23:27,139 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:23:27,139 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 02:23:27,139 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526205401] [2023-11-12 02:23:27,139 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:23:27,140 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 02:23:27,140 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:23:27,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 02:23:27,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 02:23:27,172 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 126 out of 300 [2023-11-12 02:23:27,173 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 43 places, 39 transitions, 91 flow. Second operand has 3 states, 3 states have (on average 128.33333333333334) internal successors, (385), 3 states have internal predecessors, (385), 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) [2023-11-12 02:23:27,173 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:23:27,173 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 126 of 300 [2023-11-12 02:23:27,173 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:23:27,389 INFO L124 PetriNetUnfolderBase]: 511/963 cut-off events. [2023-11-12 02:23:27,389 INFO L125 PetriNetUnfolderBase]: For 45/45 co-relation queries the response was YES. [2023-11-12 02:23:27,391 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1860 conditions, 963 events. 511/963 cut-off events. For 45/45 co-relation queries the response was YES. Maximal size of possible extension queue 81. Compared 5804 event pairs, 279 based on Foata normal form. 0/646 useless extension candidates. Maximal degree in co-relation 1851. Up to 564 conditions per place. [2023-11-12 02:23:27,398 INFO L140 encePairwiseOnDemand]: 295/300 looper letters, 41 selfloop transitions, 2 changer transitions 0/54 dead transitions. [2023-11-12 02:23:27,398 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 45 places, 54 transitions, 212 flow [2023-11-12 02:23:27,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 02:23:27,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-12 02:23:27,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 424 transitions. [2023-11-12 02:23:27,401 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4711111111111111 [2023-11-12 02:23:27,402 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 424 transitions. [2023-11-12 02:23:27,402 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 424 transitions. [2023-11-12 02:23:27,402 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:23:27,402 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 424 transitions. [2023-11-12 02:23:27,404 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 141.33333333333334) internal successors, (424), 3 states have internal predecessors, (424), 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) [2023-11-12 02:23:27,407 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 300.0) internal successors, (1200), 4 states have internal predecessors, (1200), 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) [2023-11-12 02:23:27,407 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 300.0) internal successors, (1200), 4 states have internal predecessors, (1200), 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) [2023-11-12 02:23:27,408 INFO L175 Difference]: Start difference. First operand has 43 places, 39 transitions, 91 flow. Second operand 3 states and 424 transitions. [2023-11-12 02:23:27,408 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 45 places, 54 transitions, 212 flow [2023-11-12 02:23:27,409 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 44 places, 54 transitions, 211 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-11-12 02:23:27,410 INFO L231 Difference]: Finished difference. Result has 45 places, 39 transitions, 102 flow [2023-11-12 02:23:27,410 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=300, PETRI_DIFFERENCE_MINUEND_FLOW=90, PETRI_DIFFERENCE_MINUEND_PLACES=42, 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=102, PETRI_PLACES=45, PETRI_TRANSITIONS=39} [2023-11-12 02:23:27,412 INFO L281 CegarLoopForPetriNet]: 48 programPoint places, -3 predicate places. [2023-11-12 02:23:27,412 INFO L495 AbstractCegarLoop]: Abstraction has has 45 places, 39 transitions, 102 flow [2023-11-12 02:23:27,413 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 128.33333333333334) internal successors, (385), 3 states have internal predecessors, (385), 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) [2023-11-12 02:23:27,413 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:23:27,413 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:23:27,413 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-12 02:23:27,413 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting thrErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_LEAK (and 22 more)] === [2023-11-12 02:23:27,414 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:23:27,414 INFO L85 PathProgramCache]: Analyzing trace with hash -2029690189, now seen corresponding path program 1 times [2023-11-12 02:23:27,414 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:23:27,414 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1509445561] [2023-11-12 02:23:27,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:23:27,415 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:23:27,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:23:27,486 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:23:27,486 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:23:27,486 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1509445561] [2023-11-12 02:23:27,486 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1509445561] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:23:27,486 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:23:27,487 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 02:23:27,487 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547438243] [2023-11-12 02:23:27,487 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:23:27,487 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 02:23:27,488 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:23:27,488 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 02:23:27,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 02:23:27,546 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 117 out of 300 [2023-11-12 02:23:27,546 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 45 places, 39 transitions, 102 flow. Second operand has 3 states, 3 states have (on average 119.66666666666667) internal successors, (359), 3 states have internal predecessors, (359), 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) [2023-11-12 02:23:27,546 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:23:27,547 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 117 of 300 [2023-11-12 02:23:27,547 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:23:27,684 INFO L124 PetriNetUnfolderBase]: 443/794 cut-off events. [2023-11-12 02:23:27,684 INFO L125 PetriNetUnfolderBase]: For 128/128 co-relation queries the response was YES. [2023-11-12 02:23:27,686 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1644 conditions, 794 events. 443/794 cut-off events. For 128/128 co-relation queries the response was YES. Maximal size of possible extension queue 62. Compared 4170 event pairs, 369 based on Foata normal form. 0/607 useless extension candidates. Maximal degree in co-relation 1634. Up to 731 conditions per place. [2023-11-12 02:23:27,692 INFO L140 encePairwiseOnDemand]: 293/300 looper letters, 25 selfloop transitions, 1 changer transitions 0/33 dead transitions. [2023-11-12 02:23:27,692 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 41 places, 33 transitions, 140 flow [2023-11-12 02:23:27,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 02:23:27,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-12 02:23:27,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 383 transitions. [2023-11-12 02:23:27,695 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4255555555555556 [2023-11-12 02:23:27,695 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 383 transitions. [2023-11-12 02:23:27,695 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 383 transitions. [2023-11-12 02:23:27,696 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:23:27,696 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 383 transitions. [2023-11-12 02:23:27,697 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 127.66666666666667) internal successors, (383), 3 states have internal predecessors, (383), 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) [2023-11-12 02:23:27,699 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 300.0) internal successors, (1200), 4 states have internal predecessors, (1200), 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) [2023-11-12 02:23:27,700 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 300.0) internal successors, (1200), 4 states have internal predecessors, (1200), 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) [2023-11-12 02:23:27,700 INFO L175 Difference]: Start difference. First operand has 45 places, 39 transitions, 102 flow. Second operand 3 states and 383 transitions. [2023-11-12 02:23:27,700 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 41 places, 33 transitions, 140 flow [2023-11-12 02:23:27,704 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 39 places, 33 transitions, 136 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-11-12 02:23:27,705 INFO L231 Difference]: Finished difference. Result has 39 places, 33 transitions, 86 flow [2023-11-12 02:23:27,705 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=300, PETRI_DIFFERENCE_MINUEND_FLOW=84, PETRI_DIFFERENCE_MINUEND_PLACES=37, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=33, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=32, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=86, PETRI_PLACES=39, PETRI_TRANSITIONS=33} [2023-11-12 02:23:27,708 INFO L281 CegarLoopForPetriNet]: 48 programPoint places, -9 predicate places. [2023-11-12 02:23:27,708 INFO L495 AbstractCegarLoop]: Abstraction has has 39 places, 33 transitions, 86 flow [2023-11-12 02:23:27,708 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 119.66666666666667) internal successors, (359), 3 states have internal predecessors, (359), 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) [2023-11-12 02:23:27,708 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:23:27,709 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:23:27,709 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-12 02:23:27,709 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting thrErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_LEAK (and 22 more)] === [2023-11-12 02:23:27,709 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:23:27,709 INFO L85 PathProgramCache]: Analyzing trace with hash -2029690190, now seen corresponding path program 1 times [2023-11-12 02:23:27,710 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:23:27,710 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [163354016] [2023-11-12 02:23:27,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:23:27,710 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:23:27,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:23:27,933 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:23:27,934 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:23:27,934 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [163354016] [2023-11-12 02:23:27,934 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [163354016] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:23:27,934 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:23:27,934 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 02:23:27,935 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181218489] [2023-11-12 02:23:27,935 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:23:27,936 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 02:23:27,936 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:23:27,936 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 02:23:27,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-12 02:23:28,292 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 113 out of 300 [2023-11-12 02:23:28,293 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 39 places, 33 transitions, 86 flow. Second operand has 5 states, 5 states have (on average 114.8) internal successors, (574), 5 states have internal predecessors, (574), 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) [2023-11-12 02:23:28,293 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:23:28,293 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 113 of 300 [2023-11-12 02:23:28,293 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:23:28,751 INFO L124 PetriNetUnfolderBase]: 795/1459 cut-off events. [2023-11-12 02:23:28,752 INFO L125 PetriNetUnfolderBase]: For 84/84 co-relation queries the response was YES. [2023-11-12 02:23:28,755 INFO L83 FinitePrefix]: Finished finitePrefix Result has 2942 conditions, 1459 events. 795/1459 cut-off events. For 84/84 co-relation queries the response was YES. Maximal size of possible extension queue 126. Compared 9175 event pairs, 143 based on Foata normal form. 0/1123 useless extension candidates. Maximal degree in co-relation 2931. Up to 540 conditions per place. [2023-11-12 02:23:28,766 INFO L140 encePairwiseOnDemand]: 291/300 looper letters, 88 selfloop transitions, 10 changer transitions 0/106 dead transitions. [2023-11-12 02:23:28,766 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 44 places, 106 transitions, 455 flow [2023-11-12 02:23:28,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 02:23:28,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-11-12 02:23:28,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 777 transitions. [2023-11-12 02:23:28,771 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.43166666666666664 [2023-11-12 02:23:28,771 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 777 transitions. [2023-11-12 02:23:28,771 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 777 transitions. [2023-11-12 02:23:28,772 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:23:28,772 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 777 transitions. [2023-11-12 02:23:28,774 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 129.5) internal successors, (777), 6 states have internal predecessors, (777), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:23:28,778 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 300.0) internal successors, (2100), 7 states have internal predecessors, (2100), 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) [2023-11-12 02:23:28,779 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 300.0) internal successors, (2100), 7 states have internal predecessors, (2100), 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) [2023-11-12 02:23:28,780 INFO L175 Difference]: Start difference. First operand has 39 places, 33 transitions, 86 flow. Second operand 6 states and 777 transitions. [2023-11-12 02:23:28,780 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 44 places, 106 transitions, 455 flow [2023-11-12 02:23:28,781 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 43 places, 106 transitions, 454 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-11-12 02:23:28,784 INFO L231 Difference]: Finished difference. Result has 47 places, 42 transitions, 162 flow [2023-11-12 02:23:28,784 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=300, PETRI_DIFFERENCE_MINUEND_FLOW=85, PETRI_DIFFERENCE_MINUEND_PLACES=38, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=33, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=25, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=162, PETRI_PLACES=47, PETRI_TRANSITIONS=42} [2023-11-12 02:23:28,785 INFO L281 CegarLoopForPetriNet]: 48 programPoint places, -1 predicate places. [2023-11-12 02:23:28,785 INFO L495 AbstractCegarLoop]: Abstraction has has 47 places, 42 transitions, 162 flow [2023-11-12 02:23:28,785 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 114.8) internal successors, (574), 5 states have internal predecessors, (574), 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) [2023-11-12 02:23:28,786 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:23:28,786 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-11-12 02:23:28,786 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-11-12 02:23:28,786 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_LEAK (and 22 more)] === [2023-11-12 02:23:28,787 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:23:28,787 INFO L85 PathProgramCache]: Analyzing trace with hash -567490616, now seen corresponding path program 1 times [2023-11-12 02:23:28,787 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:23:28,787 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [406398759] [2023-11-12 02:23:28,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:23:28,788 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:23:28,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-11-12 02:23:28,802 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-11-12 02:23:28,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-11-12 02:23:28,815 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-11-12 02:23:28,816 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-11-12 02:23:28,816 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (24 of 25 remaining) [2023-11-12 02:23:28,816 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (23 of 25 remaining) [2023-11-12 02:23:28,817 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (22 of 25 remaining) [2023-11-12 02:23:28,817 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_LEAK (21 of 25 remaining) [2023-11-12 02:23:28,817 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (20 of 25 remaining) [2023-11-12 02:23:28,817 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (19 of 25 remaining) [2023-11-12 02:23:28,817 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (18 of 25 remaining) [2023-11-12 02:23:28,818 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (17 of 25 remaining) [2023-11-12 02:23:28,818 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (16 of 25 remaining) [2023-11-12 02:23:28,818 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (15 of 25 remaining) [2023-11-12 02:23:28,818 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr6ASSERT_VIOLATIONMEMORY_LEAK (14 of 25 remaining) [2023-11-12 02:23:28,818 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (13 of 25 remaining) [2023-11-12 02:23:28,819 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (12 of 25 remaining) [2023-11-12 02:23:28,819 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (11 of 25 remaining) [2023-11-12 02:23:28,819 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (10 of 25 remaining) [2023-11-12 02:23:28,819 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (9 of 25 remaining) [2023-11-12 02:23:28,819 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 25 remaining) [2023-11-12 02:23:28,820 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr6ASSERT_VIOLATIONMEMORY_LEAK (7 of 25 remaining) [2023-11-12 02:23:28,820 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 25 remaining) [2023-11-12 02:23:28,820 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 25 remaining) [2023-11-12 02:23:28,820 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 25 remaining) [2023-11-12 02:23:28,820 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 25 remaining) [2023-11-12 02:23:28,821 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 25 remaining) [2023-11-12 02:23:28,821 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 25 remaining) [2023-11-12 02:23:28,821 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location thrErr6ASSERT_VIOLATIONMEMORY_LEAK (0 of 25 remaining) [2023-11-12 02:23:28,821 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-12 02:23:28,821 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1] [2023-11-12 02:23:28,822 WARN L234 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-11-12 02:23:28,822 INFO L521 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-11-12 02:23:28,858 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-11-12 02:23:28,862 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 186 places, 196 transitions, 410 flow [2023-11-12 02:23:28,897 INFO L124 PetriNetUnfolderBase]: 20/254 cut-off events. [2023-11-12 02:23:28,898 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-11-12 02:23:28,901 INFO L83 FinitePrefix]: Finished finitePrefix Result has 267 conditions, 254 events. 20/254 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 828 event pairs, 0 based on Foata normal form. 0/197 useless extension candidates. Maximal degree in co-relation 191. Up to 8 conditions per place. [2023-11-12 02:23:28,901 INFO L82 GeneralOperation]: Start removeDead. Operand has 186 places, 196 transitions, 410 flow [2023-11-12 02:23:28,905 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 186 places, 196 transitions, 410 flow [2023-11-12 02:23:28,906 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-11-12 02:23:28,906 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 186 places, 196 transitions, 410 flow [2023-11-12 02:23:28,906 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 186 places, 196 transitions, 410 flow [2023-11-12 02:23:28,906 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 186 places, 196 transitions, 410 flow [2023-11-12 02:23:28,957 INFO L124 PetriNetUnfolderBase]: 20/254 cut-off events. [2023-11-12 02:23:28,958 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-11-12 02:23:28,960 INFO L83 FinitePrefix]: Finished finitePrefix Result has 267 conditions, 254 events. 20/254 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 828 event pairs, 0 based on Foata normal form. 0/197 useless extension candidates. Maximal degree in co-relation 191. Up to 8 conditions per place. [2023-11-12 02:23:28,976 INFO L119 LiptonReduction]: Number of co-enabled transitions 18768 [2023-11-12 02:23:34,066 INFO L134 LiptonReduction]: Checked pairs total: 49768 [2023-11-12 02:23:34,066 INFO L136 LiptonReduction]: Total number of compositions: 191 [2023-11-12 02:23:34,068 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 02:23:34,069 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;@55f283ae, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-11-12 02:23:34,069 INFO L358 AbstractCegarLoop]: Starting to check reachability of 32 error locations. [2023-11-12 02:23:34,070 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-11-12 02:23:34,071 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-11-12 02:23:34,071 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-12 02:23:34,071 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:23:34,071 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-11-12 02:23:34,071 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_LEAK (and 29 more)] === [2023-11-12 02:23:34,072 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:23:34,072 INFO L85 PathProgramCache]: Analyzing trace with hash 39904, now seen corresponding path program 1 times [2023-11-12 02:23:34,072 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:23:34,072 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [133978030] [2023-11-12 02:23:34,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:23:34,073 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:23:34,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:23:34,108 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:23:34,108 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:23:34,108 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [133978030] [2023-11-12 02:23:34,109 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [133978030] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:23:34,109 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:23:34,109 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 02:23:34,109 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620984370] [2023-11-12 02:23:34,109 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:23:34,110 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 02:23:34,110 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:23:34,110 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 02:23:34,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 02:23:34,167 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 165 out of 387 [2023-11-12 02:23:34,168 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 67 places, 69 transitions, 156 flow. Second operand has 3 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) [2023-11-12 02:23:34,168 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:23:34,168 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 165 of 387 [2023-11-12 02:23:34,168 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:23:36,019 INFO L124 PetriNetUnfolderBase]: 9594/14853 cut-off events. [2023-11-12 02:23:36,019 INFO L125 PetriNetUnfolderBase]: For 763/763 co-relation queries the response was YES. [2023-11-12 02:23:36,053 INFO L83 FinitePrefix]: Finished finitePrefix Result has 28217 conditions, 14853 events. 9594/14853 cut-off events. For 763/763 co-relation queries the response was YES. Maximal size of possible extension queue 1110. Compared 107643 event pairs, 7668 based on Foata normal form. 963/9378 useless extension candidates. Maximal degree in co-relation 2537. Up to 12927 conditions per place. [2023-11-12 02:23:36,172 INFO L140 encePairwiseOnDemand]: 374/387 looper letters, 38 selfloop transitions, 1 changer transitions 0/57 dead transitions. [2023-11-12 02:23:36,172 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 60 places, 57 transitions, 210 flow [2023-11-12 02:23:36,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 02:23:36,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-12 02:23:36,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 546 transitions. [2023-11-12 02:23:36,176 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4702842377260982 [2023-11-12 02:23:36,176 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 546 transitions. [2023-11-12 02:23:36,177 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 546 transitions. [2023-11-12 02:23:36,177 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:23:36,177 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 546 transitions. [2023-11-12 02:23:36,179 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 182.0) internal successors, (546), 3 states have internal predecessors, (546), 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) [2023-11-12 02:23:36,185 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 387.0) internal successors, (1548), 4 states have internal predecessors, (1548), 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) [2023-11-12 02:23:36,186 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 387.0) internal successors, (1548), 4 states have internal predecessors, (1548), 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) [2023-11-12 02:23:36,186 INFO L175 Difference]: Start difference. First operand has 67 places, 69 transitions, 156 flow. Second operand 3 states and 546 transitions. [2023-11-12 02:23:36,186 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 60 places, 57 transitions, 210 flow [2023-11-12 02:23:36,190 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 60 places, 57 transitions, 208 flow, removed 1 selfloop flow, removed 0 redundant places. [2023-11-12 02:23:36,194 INFO L231 Difference]: Finished difference. Result has 60 places, 57 transitions, 132 flow [2023-11-12 02:23:36,195 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=387, PETRI_DIFFERENCE_MINUEND_FLOW=130, PETRI_DIFFERENCE_MINUEND_PLACES=58, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=57, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=56, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=132, PETRI_PLACES=60, PETRI_TRANSITIONS=57} [2023-11-12 02:23:36,196 INFO L281 CegarLoopForPetriNet]: 67 programPoint places, -7 predicate places. [2023-11-12 02:23:36,197 INFO L495 AbstractCegarLoop]: Abstraction has has 60 places, 57 transitions, 132 flow [2023-11-12 02:23:36,197 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 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) [2023-11-12 02:23:36,197 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:23:36,198 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-11-12 02:23:36,198 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-11-12 02:23:36,198 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_LEAK (and 29 more)] === [2023-11-12 02:23:36,198 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:23:36,198 INFO L85 PathProgramCache]: Analyzing trace with hash 39905, now seen corresponding path program 1 times [2023-11-12 02:23:36,199 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:23:36,199 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [471746125] [2023-11-12 02:23:36,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:23:36,199 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:23:36,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:23:36,282 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:23:36,282 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:23:36,283 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [471746125] [2023-11-12 02:23:36,283 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [471746125] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:23:36,283 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:23:36,283 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 02:23:36,283 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206621816] [2023-11-12 02:23:36,283 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:23:36,284 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 02:23:36,284 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:23:36,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 02:23:36,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 02:23:36,348 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 166 out of 387 [2023-11-12 02:23:36,349 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 60 places, 57 transitions, 132 flow. Second operand has 3 states, 3 states have (on average 166.66666666666666) internal successors, (500), 3 states have internal predecessors, (500), 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) [2023-11-12 02:23:36,349 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:23:36,349 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 166 of 387 [2023-11-12 02:23:36,350 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:23:37,777 INFO L124 PetriNetUnfolderBase]: 6063/9623 cut-off events. [2023-11-12 02:23:37,777 INFO L125 PetriNetUnfolderBase]: For 468/468 co-relation queries the response was YES. [2023-11-12 02:23:37,802 INFO L83 FinitePrefix]: Finished finitePrefix Result has 18247 conditions, 9623 events. 6063/9623 cut-off events. For 468/468 co-relation queries the response was YES. Maximal size of possible extension queue 664. Compared 66215 event pairs, 4779 based on Foata normal form. 0/6034 useless extension candidates. Maximal degree in co-relation 18238. Up to 8285 conditions per place. [2023-11-12 02:23:37,859 INFO L140 encePairwiseOnDemand]: 385/387 looper letters, 37 selfloop transitions, 1 changer transitions 0/56 dead transitions. [2023-11-12 02:23:37,860 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 61 places, 56 transitions, 206 flow [2023-11-12 02:23:37,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 02:23:37,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-12 02:23:37,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 537 transitions. [2023-11-12 02:23:37,864 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4625322997416021 [2023-11-12 02:23:37,864 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 537 transitions. [2023-11-12 02:23:37,864 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 537 transitions. [2023-11-12 02:23:37,865 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:23:37,865 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 537 transitions. [2023-11-12 02:23:37,867 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 179.0) internal successors, (537), 3 states have internal predecessors, (537), 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) [2023-11-12 02:23:37,871 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 387.0) internal successors, (1548), 4 states have internal predecessors, (1548), 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) [2023-11-12 02:23:37,872 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 387.0) internal successors, (1548), 4 states have internal predecessors, (1548), 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) [2023-11-12 02:23:37,872 INFO L175 Difference]: Start difference. First operand has 60 places, 57 transitions, 132 flow. Second operand 3 states and 537 transitions. [2023-11-12 02:23:37,872 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 61 places, 56 transitions, 206 flow [2023-11-12 02:23:37,875 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 60 places, 56 transitions, 205 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-11-12 02:23:37,877 INFO L231 Difference]: Finished difference. Result has 60 places, 56 transitions, 131 flow [2023-11-12 02:23:37,877 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=387, PETRI_DIFFERENCE_MINUEND_FLOW=129, PETRI_DIFFERENCE_MINUEND_PLACES=58, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=56, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=55, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=131, PETRI_PLACES=60, PETRI_TRANSITIONS=56} [2023-11-12 02:23:37,878 INFO L281 CegarLoopForPetriNet]: 67 programPoint places, -7 predicate places. [2023-11-12 02:23:37,878 INFO L495 AbstractCegarLoop]: Abstraction has has 60 places, 56 transitions, 131 flow [2023-11-12 02:23:37,879 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 166.66666666666666) internal successors, (500), 3 states have internal predecessors, (500), 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) [2023-11-12 02:23:37,879 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:23:37,879 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:23:37,879 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-11-12 02:23:37,880 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting thrErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_LEAK (and 29 more)] === [2023-11-12 02:23:37,880 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:23:37,880 INFO L85 PathProgramCache]: Analyzing trace with hash 911777208, now seen corresponding path program 1 times [2023-11-12 02:23:37,880 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:23:37,881 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [860291997] [2023-11-12 02:23:37,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:23:37,881 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:23:37,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:23:37,952 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:23:37,953 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:23:37,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [860291997] [2023-11-12 02:23:37,953 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [860291997] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:23:37,953 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:23:37,953 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 02:23:37,954 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1087099851] [2023-11-12 02:23:37,954 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:23:37,954 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 02:23:37,954 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:23:37,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 02:23:37,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 02:23:37,982 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 166 out of 387 [2023-11-12 02:23:37,983 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 60 places, 56 transitions, 131 flow. Second operand has 3 states, 3 states have (on average 168.33333333333334) internal successors, (505), 3 states have internal predecessors, (505), 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) [2023-11-12 02:23:37,983 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:23:37,984 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 166 of 387 [2023-11-12 02:23:37,984 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:23:39,684 INFO L124 PetriNetUnfolderBase]: 8761/13493 cut-off events. [2023-11-12 02:23:39,687 INFO L125 PetriNetUnfolderBase]: For 639/639 co-relation queries the response was YES. [2023-11-12 02:23:39,720 INFO L83 FinitePrefix]: Finished finitePrefix Result has 26091 conditions, 13493 events. 8761/13493 cut-off events. For 639/639 co-relation queries the response was YES. Maximal size of possible extension queue 756. Compared 94833 event pairs, 4571 based on Foata normal form. 0/8751 useless extension candidates. Maximal degree in co-relation 26081. Up to 8064 conditions per place. [2023-11-12 02:23:39,787 INFO L140 encePairwiseOnDemand]: 382/387 looper letters, 65 selfloop transitions, 2 changer transitions 0/83 dead transitions. [2023-11-12 02:23:39,787 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 62 places, 83 transitions, 329 flow [2023-11-12 02:23:39,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 02:23:39,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-12 02:23:39,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 568 transitions. [2023-11-12 02:23:39,790 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4892334194659776 [2023-11-12 02:23:39,790 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 568 transitions. [2023-11-12 02:23:39,790 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 568 transitions. [2023-11-12 02:23:39,791 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:23:39,791 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 568 transitions. [2023-11-12 02:23:39,792 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 189.33333333333334) internal successors, (568), 3 states have internal predecessors, (568), 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) [2023-11-12 02:23:39,795 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 387.0) internal successors, (1548), 4 states have internal predecessors, (1548), 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) [2023-11-12 02:23:39,796 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 387.0) internal successors, (1548), 4 states have internal predecessors, (1548), 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) [2023-11-12 02:23:39,796 INFO L175 Difference]: Start difference. First operand has 60 places, 56 transitions, 131 flow. Second operand 3 states and 568 transitions. [2023-11-12 02:23:39,796 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 62 places, 83 transitions, 329 flow [2023-11-12 02:23:39,798 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 61 places, 83 transitions, 328 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-11-12 02:23:39,800 INFO L231 Difference]: Finished difference. Result has 62 places, 56 transitions, 142 flow [2023-11-12 02:23:39,800 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=387, PETRI_DIFFERENCE_MINUEND_FLOW=130, PETRI_DIFFERENCE_MINUEND_PLACES=59, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=56, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=54, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=142, PETRI_PLACES=62, PETRI_TRANSITIONS=56} [2023-11-12 02:23:39,801 INFO L281 CegarLoopForPetriNet]: 67 programPoint places, -5 predicate places. [2023-11-12 02:23:39,801 INFO L495 AbstractCegarLoop]: Abstraction has has 62 places, 56 transitions, 142 flow [2023-11-12 02:23:39,801 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 168.33333333333334) internal successors, (505), 3 states have internal predecessors, (505), 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) [2023-11-12 02:23:39,801 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:23:39,802 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:23:39,802 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-11-12 02:23:39,802 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting thrErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_LEAK (and 29 more)] === [2023-11-12 02:23:39,802 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:23:39,802 INFO L85 PathProgramCache]: Analyzing trace with hash 2046998338, now seen corresponding path program 1 times [2023-11-12 02:23:39,803 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:23:39,803 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1362390674] [2023-11-12 02:23:39,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:23:39,803 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:23:39,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:23:39,966 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:23:39,966 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:23:39,966 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1362390674] [2023-11-12 02:23:39,967 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1362390674] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:23:39,967 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:23:39,967 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 02:23:39,967 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990279532] [2023-11-12 02:23:39,967 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:23:39,968 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-12 02:23:39,968 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:23:39,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-12 02:23:39,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-12 02:23:40,295 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 151 out of 387 [2023-11-12 02:23:40,297 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 62 places, 56 transitions, 142 flow. Second operand has 6 states, 6 states have (on average 152.66666666666666) internal successors, (916), 6 states have internal predecessors, (916), 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) [2023-11-12 02:23:40,297 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:23:40,297 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 151 of 387 [2023-11-12 02:23:40,297 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:23:43,394 INFO L124 PetriNetUnfolderBase]: 18766/29568 cut-off events. [2023-11-12 02:23:43,394 INFO L125 PetriNetUnfolderBase]: For 2670/2670 co-relation queries the response was YES. [2023-11-12 02:23:43,479 INFO L83 FinitePrefix]: Finished finitePrefix Result has 59281 conditions, 29568 events. 18766/29568 cut-off events. For 2670/2670 co-relation queries the response was YES. Maximal size of possible extension queue 1726. Compared 240861 event pairs, 2518 based on Foata normal form. 0/19927 useless extension candidates. Maximal degree in co-relation 59270. Up to 11163 conditions per place. [2023-11-12 02:23:43,680 INFO L140 encePairwiseOnDemand]: 376/387 looper letters, 151 selfloop transitions, 13 changer transitions 0/181 dead transitions. [2023-11-12 02:23:43,681 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 67 places, 181 transitions, 779 flow [2023-11-12 02:23:43,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 02:23:43,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-11-12 02:23:43,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1071 transitions. [2023-11-12 02:23:43,696 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.46124031007751937 [2023-11-12 02:23:43,696 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1071 transitions. [2023-11-12 02:23:43,696 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1071 transitions. [2023-11-12 02:23:43,698 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:23:43,698 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1071 transitions. [2023-11-12 02:23:43,704 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 178.5) internal successors, (1071), 6 states have internal predecessors, (1071), 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) [2023-11-12 02:23:43,712 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 387.0) internal successors, (2709), 7 states have internal predecessors, (2709), 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) [2023-11-12 02:23:43,713 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 387.0) internal successors, (2709), 7 states have internal predecessors, (2709), 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) [2023-11-12 02:23:43,714 INFO L175 Difference]: Start difference. First operand has 62 places, 56 transitions, 142 flow. Second operand 6 states and 1071 transitions. [2023-11-12 02:23:43,714 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 67 places, 181 transitions, 779 flow [2023-11-12 02:23:43,751 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 65 places, 181 transitions, 765 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-11-12 02:23:43,755 INFO L231 Difference]: Finished difference. Result has 69 places, 68 transitions, 238 flow [2023-11-12 02:23:43,756 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=387, PETRI_DIFFERENCE_MINUEND_FLOW=138, PETRI_DIFFERENCE_MINUEND_PLACES=60, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=56, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=46, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=238, PETRI_PLACES=69, PETRI_TRANSITIONS=68} [2023-11-12 02:23:43,757 INFO L281 CegarLoopForPetriNet]: 67 programPoint places, 2 predicate places. [2023-11-12 02:23:43,757 INFO L495 AbstractCegarLoop]: Abstraction has has 69 places, 68 transitions, 238 flow [2023-11-12 02:23:43,758 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 152.66666666666666) internal successors, (916), 6 states have internal predecessors, (916), 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) [2023-11-12 02:23:43,758 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:23:43,759 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:23:43,759 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-11-12 02:23:43,759 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting thrErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_LEAK (and 29 more)] === [2023-11-12 02:23:43,760 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:23:43,760 INFO L85 PathProgramCache]: Analyzing trace with hash 2046998340, now seen corresponding path program 1 times [2023-11-12 02:23:43,760 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:23:43,760 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2020759589] [2023-11-12 02:23:43,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:23:43,761 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:23:43,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:23:43,833 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:23:43,833 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:23:43,833 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2020759589] [2023-11-12 02:23:43,833 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2020759589] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:23:43,834 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:23:43,834 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 02:23:43,834 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [323486248] [2023-11-12 02:23:43,834 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:23:43,835 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 02:23:43,835 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:23:43,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 02:23:43,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 02:23:43,917 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 151 out of 387 [2023-11-12 02:23:43,918 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 69 places, 68 transitions, 238 flow. Second operand has 3 states, 3 states have (on average 153.66666666666666) internal successors, (461), 3 states have internal predecessors, (461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:23:43,918 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:23:43,918 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 151 of 387 [2023-11-12 02:23:43,918 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:23:46,335 INFO L124 PetriNetUnfolderBase]: 17867/26158 cut-off events. [2023-11-12 02:23:46,335 INFO L125 PetriNetUnfolderBase]: For 10811/11244 co-relation queries the response was YES. [2023-11-12 02:23:46,406 INFO L83 FinitePrefix]: Finished finitePrefix Result has 60057 conditions, 26158 events. 17867/26158 cut-off events. For 10811/11244 co-relation queries the response was YES. Maximal size of possible extension queue 1399. Compared 181695 event pairs, 14039 based on Foata normal form. 277/22079 useless extension candidates. Maximal degree in co-relation 60041. Up to 24675 conditions per place. [2023-11-12 02:23:46,537 INFO L140 encePairwiseOnDemand]: 377/387 looper letters, 47 selfloop transitions, 1 changer transitions 0/59 dead transitions. [2023-11-12 02:23:46,538 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 62 places, 59 transitions, 314 flow [2023-11-12 02:23:46,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 02:23:46,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-12 02:23:46,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 500 transitions. [2023-11-12 02:23:46,541 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4306632213608958 [2023-11-12 02:23:46,541 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 500 transitions. [2023-11-12 02:23:46,541 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 500 transitions. [2023-11-12 02:23:46,541 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:23:46,542 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 500 transitions. [2023-11-12 02:23:46,543 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 166.66666666666666) internal successors, (500), 3 states have internal predecessors, (500), 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) [2023-11-12 02:23:46,546 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 387.0) internal successors, (1548), 4 states have internal predecessors, (1548), 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) [2023-11-12 02:23:46,546 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 387.0) internal successors, (1548), 4 states have internal predecessors, (1548), 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) [2023-11-12 02:23:46,546 INFO L175 Difference]: Start difference. First operand has 69 places, 68 transitions, 238 flow. Second operand 3 states and 500 transitions. [2023-11-12 02:23:46,547 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 62 places, 59 transitions, 314 flow [2023-11-12 02:23:46,576 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 61 places, 59 transitions, 309 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-11-12 02:23:46,578 INFO L231 Difference]: Finished difference. Result has 61 places, 59 transitions, 215 flow [2023-11-12 02:23:46,578 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=387, PETRI_DIFFERENCE_MINUEND_FLOW=213, PETRI_DIFFERENCE_MINUEND_PLACES=59, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=59, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=58, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=215, PETRI_PLACES=61, PETRI_TRANSITIONS=59} [2023-11-12 02:23:46,578 INFO L281 CegarLoopForPetriNet]: 67 programPoint places, -6 predicate places. [2023-11-12 02:23:46,579 INFO L495 AbstractCegarLoop]: Abstraction has has 61 places, 59 transitions, 215 flow [2023-11-12 02:23:46,579 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 153.66666666666666) internal successors, (461), 3 states have internal predecessors, (461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:23:46,579 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:23:46,579 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:23:46,580 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2023-11-12 02:23:46,580 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting thrErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_LEAK (and 29 more)] === [2023-11-12 02:23:46,580 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:23:46,580 INFO L85 PathProgramCache]: Analyzing trace with hash 2017768658, now seen corresponding path program 1 times [2023-11-12 02:23:46,580 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:23:46,581 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [316715499] [2023-11-12 02:23:46,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:23:46,581 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:23:46,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:23:46,623 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 02:23:46,624 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:23:46,625 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [316715499] [2023-11-12 02:23:46,625 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [316715499] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:23:46,625 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:23:46,625 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 02:23:46,625 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810122763] [2023-11-12 02:23:46,625 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:23:46,626 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 02:23:46,626 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:23:46,627 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 02:23:46,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 02:23:46,655 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 166 out of 387 [2023-11-12 02:23:46,656 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 61 places, 59 transitions, 215 flow. Second operand has 3 states, 3 states have (on average 168.66666666666666) internal successors, (506), 3 states have internal predecessors, (506), 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) [2023-11-12 02:23:46,656 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:23:46,656 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 166 of 387 [2023-11-12 02:23:46,656 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:23:49,331 INFO L124 PetriNetUnfolderBase]: 17808/26495 cut-off events. [2023-11-12 02:23:49,331 INFO L125 PetriNetUnfolderBase]: For 10132/10481 co-relation queries the response was YES. [2023-11-12 02:23:49,412 INFO L83 FinitePrefix]: Finished finitePrefix Result has 59923 conditions, 26495 events. 17808/26495 cut-off events. For 10132/10481 co-relation queries the response was YES. Maximal size of possible extension queue 1538. Compared 197509 event pairs, 8749 based on Foata normal form. 195/22538 useless extension candidates. Maximal degree in co-relation 59906. Up to 15984 conditions per place. [2023-11-12 02:23:49,516 INFO L140 encePairwiseOnDemand]: 383/387 looper letters, 76 selfloop transitions, 2 changer transitions 0/90 dead transitions. [2023-11-12 02:23:49,516 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 63 places, 90 transitions, 484 flow [2023-11-12 02:23:49,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 02:23:49,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-12 02:23:49,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 561 transitions. [2023-11-12 02:23:49,519 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.48320413436692505 [2023-11-12 02:23:49,520 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 561 transitions. [2023-11-12 02:23:49,520 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 561 transitions. [2023-11-12 02:23:49,521 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:23:49,521 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 561 transitions. [2023-11-12 02:23:49,523 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 187.0) internal successors, (561), 3 states have internal predecessors, (561), 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) [2023-11-12 02:23:49,526 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 387.0) internal successors, (1548), 4 states have internal predecessors, (1548), 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) [2023-11-12 02:23:49,527 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 387.0) internal successors, (1548), 4 states have internal predecessors, (1548), 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) [2023-11-12 02:23:49,527 INFO L175 Difference]: Start difference. First operand has 61 places, 59 transitions, 215 flow. Second operand 3 states and 561 transitions. [2023-11-12 02:23:49,527 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 63 places, 90 transitions, 484 flow [2023-11-12 02:23:49,558 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 62 places, 90 transitions, 483 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-11-12 02:23:49,560 INFO L231 Difference]: Finished difference. Result has 63 places, 59 transitions, 224 flow [2023-11-12 02:23:49,561 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=387, PETRI_DIFFERENCE_MINUEND_FLOW=214, PETRI_DIFFERENCE_MINUEND_PLACES=60, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=59, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=57, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=224, PETRI_PLACES=63, PETRI_TRANSITIONS=59} [2023-11-12 02:23:49,561 INFO L281 CegarLoopForPetriNet]: 67 programPoint places, -4 predicate places. [2023-11-12 02:23:49,561 INFO L495 AbstractCegarLoop]: Abstraction has has 63 places, 59 transitions, 224 flow [2023-11-12 02:23:49,562 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 168.66666666666666) internal successors, (506), 3 states have internal predecessors, (506), 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) [2023-11-12 02:23:49,562 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:23:49,562 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:23:49,562 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-11-12 02:23:49,563 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting thrErr6ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_LEAK (and 29 more)] === [2023-11-12 02:23:49,563 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:23:49,563 INFO L85 PathProgramCache]: Analyzing trace with hash 70411586, now seen corresponding path program 1 times [2023-11-12 02:23:49,563 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:23:49,564 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193793196] [2023-11-12 02:23:49,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:23:49,564 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:23:49,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:23:49,651 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:23:49,651 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:23:49,651 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193793196] [2023-11-12 02:23:49,651 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [193793196] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:23:49,652 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:23:49,652 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 02:23:49,652 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1633267609] [2023-11-12 02:23:49,652 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:23:49,653 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 02:23:49,653 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:23:49,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 02:23:49,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 02:23:49,741 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 161 out of 387 [2023-11-12 02:23:49,742 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 63 places, 59 transitions, 224 flow. Second operand has 3 states, 3 states have (on average 164.66666666666666) internal successors, (494), 3 states have internal predecessors, (494), 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) [2023-11-12 02:23:49,742 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:23:49,742 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 161 of 387 [2023-11-12 02:23:49,742 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:23:52,960 INFO L124 PetriNetUnfolderBase]: 17933/27307 cut-off events. [2023-11-12 02:23:52,960 INFO L125 PetriNetUnfolderBase]: For 13163/13263 co-relation queries the response was YES. [2023-11-12 02:23:53,052 INFO L83 FinitePrefix]: Finished finitePrefix Result has 63852 conditions, 27307 events. 17933/27307 cut-off events. For 13163/13263 co-relation queries the response was YES. Maximal size of possible extension queue 1477. Compared 203472 event pairs, 13107 based on Foata normal form. 496/23892 useless extension candidates. Maximal degree in co-relation 63834. Up to 23630 conditions per place. [2023-11-12 02:23:53,312 INFO L140 encePairwiseOnDemand]: 381/387 looper letters, 68 selfloop transitions, 6 changer transitions 0/84 dead transitions. [2023-11-12 02:23:53,312 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 65 places, 84 transitions, 455 flow [2023-11-12 02:23:53,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 02:23:53,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-12 02:23:53,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 545 transitions. [2023-11-12 02:23:53,317 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4694229112833764 [2023-11-12 02:23:53,317 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 545 transitions. [2023-11-12 02:23:53,317 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 545 transitions. [2023-11-12 02:23:53,318 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:23:53,318 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 545 transitions. [2023-11-12 02:23:53,320 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 181.66666666666666) internal successors, (545), 3 states have internal predecessors, (545), 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) [2023-11-12 02:23:53,323 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 387.0) internal successors, (1548), 4 states have internal predecessors, (1548), 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) [2023-11-12 02:23:53,323 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 387.0) internal successors, (1548), 4 states have internal predecessors, (1548), 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) [2023-11-12 02:23:53,324 INFO L175 Difference]: Start difference. First operand has 63 places, 59 transitions, 224 flow. Second operand 3 states and 545 transitions. [2023-11-12 02:23:53,324 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 65 places, 84 transitions, 455 flow [2023-11-12 02:23:53,355 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 63 places, 84 transitions, 449 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-11-12 02:23:53,357 INFO L231 Difference]: Finished difference. Result has 64 places, 64 transitions, 266 flow [2023-11-12 02:23:53,357 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=387, PETRI_DIFFERENCE_MINUEND_FLOW=220, PETRI_DIFFERENCE_MINUEND_PLACES=61, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=59, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=53, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=266, PETRI_PLACES=64, PETRI_TRANSITIONS=64} [2023-11-12 02:23:53,358 INFO L281 CegarLoopForPetriNet]: 67 programPoint places, -3 predicate places. [2023-11-12 02:23:53,358 INFO L495 AbstractCegarLoop]: Abstraction has has 64 places, 64 transitions, 266 flow [2023-11-12 02:23:53,358 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 164.66666666666666) internal successors, (494), 3 states have internal predecessors, (494), 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) [2023-11-12 02:23:53,358 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:23:53,359 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:23:53,359 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2023-11-12 02:23:53,359 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting thrErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_LEAK (and 29 more)] === [2023-11-12 02:23:53,359 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:23:53,359 INFO L85 PathProgramCache]: Analyzing trace with hash -2112206570, now seen corresponding path program 1 times [2023-11-12 02:23:53,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:23:53,360 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1827177762] [2023-11-12 02:23:53,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:23:53,360 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:23:53,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:23:53,627 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:23:53,627 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:23:53,627 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1827177762] [2023-11-12 02:23:53,628 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1827177762] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 02:23:53,628 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [196281924] [2023-11-12 02:23:53,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:23:53,628 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 02:23:53,628 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7220eb1-2d7c-4cb0-8839-ef0e162676dc/bin/uautomizer-verify-uTZkv6EMXl/z3 [2023-11-12 02:23:53,632 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7220eb1-2d7c-4cb0-8839-ef0e162676dc/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 02:23:53,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7220eb1-2d7c-4cb0-8839-ef0e162676dc/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 02:23:53,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:23:53,770 INFO L262 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-12 02:23:53,773 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 02:23:53,835 INFO L351 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 10 treesize of output 9 [2023-11-12 02:23:53,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 02:23:53,851 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-11-12 02:23:54,261 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:23:54,262 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 02:23:54,560 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:23:54,560 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [196281924] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 02:23:54,560 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 02:23:54,560 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4, 5] total 15 [2023-11-12 02:23:54,561 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325181400] [2023-11-12 02:23:54,561 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 02:23:54,561 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-12 02:23:54,562 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:23:54,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-12 02:23:54,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2023-11-12 02:23:56,403 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 139 out of 387 [2023-11-12 02:23:56,407 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 64 places, 64 transitions, 266 flow. Second operand has 17 states, 17 states have (on average 141.1764705882353) internal successors, (2400), 17 states have internal predecessors, (2400), 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) [2023-11-12 02:23:56,407 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:23:56,407 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 139 of 387 [2023-11-12 02:23:56,407 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand