./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/pthread-divine/ring_2w1r-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version e7bb482b 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_2004099a-1b31-49a3-a6e3-82a4256bba2d/bin/uautomizer-verify-WvqO1wxjHP/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2004099a-1b31-49a3-a6e3-82a4256bba2d/bin/uautomizer-verify-WvqO1wxjHP/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2004099a-1b31-49a3-a6e3-82a4256bba2d/bin/uautomizer-verify-WvqO1wxjHP/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2004099a-1b31-49a3-a6e3-82a4256bba2d/bin/uautomizer-verify-WvqO1wxjHP/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/pthread-divine/ring_2w1r-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2004099a-1b31-49a3-a6e3-82a4256bba2d/bin/uautomizer-verify-WvqO1wxjHP/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2004099a-1b31-49a3-a6e3-82a4256bba2d/bin/uautomizer-verify-WvqO1wxjHP --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 509c3c8c1895397e4c0d03f6462ad0ca0ed3ce99b40d08b775ab8473dba5ee1f --- Real Ultimate output --- This is Ultimate 0.2.3-dev-e7bb482 [2023-11-06 22:52:04,422 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-06 22:52:04,542 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2004099a-1b31-49a3-a6e3-82a4256bba2d/bin/uautomizer-verify-WvqO1wxjHP/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2023-11-06 22:52:04,557 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-06 22:52:04,559 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-06 22:52:04,611 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-06 22:52:04,613 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-06 22:52:04,614 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-06 22:52:04,615 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-06 22:52:04,620 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-06 22:52:04,621 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-06 22:52:04,622 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-06 22:52:04,623 INFO L153 SettingsManager]: * Use SBE=true [2023-11-06 22:52:04,624 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-06 22:52:04,625 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-06 22:52:04,625 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-06 22:52:04,626 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-06 22:52:04,626 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-06 22:52:04,627 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-06 22:52:04,627 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-06 22:52:04,628 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-06 22:52:04,628 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-06 22:52:04,629 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-06 22:52:04,629 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-06 22:52:04,630 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-06 22:52:04,630 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-06 22:52:04,631 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-06 22:52:04,632 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-06 22:52:04,632 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-06 22:52:04,633 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 22:52:04,634 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-06 22:52:04,635 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-06 22:52:04,635 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-06 22:52:04,635 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-06 22:52:04,635 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-06 22:52:04,636 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-06 22:52:04,636 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-06 22:52:04,636 INFO L153 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-11-06 22:52:04,636 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_2004099a-1b31-49a3-a6e3-82a4256bba2d/bin/uautomizer-verify-WvqO1wxjHP/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2004099a-1b31-49a3-a6e3-82a4256bba2d/bin/uautomizer-verify-WvqO1wxjHP Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 509c3c8c1895397e4c0d03f6462ad0ca0ed3ce99b40d08b775ab8473dba5ee1f [2023-11-06 22:52:04,983 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-06 22:52:05,007 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-06 22:52:05,011 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-06 22:52:05,012 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-06 22:52:05,013 INFO L274 PluginConnector]: CDTParser initialized [2023-11-06 22:52:05,014 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2004099a-1b31-49a3-a6e3-82a4256bba2d/bin/uautomizer-verify-WvqO1wxjHP/../../sv-benchmarks/c/pthread-divine/ring_2w1r-1.i [2023-11-06 22:52:08,027 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-06 22:52:08,445 INFO L384 CDTParser]: Found 1 translation units. [2023-11-06 22:52:08,446 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2004099a-1b31-49a3-a6e3-82a4256bba2d/sv-benchmarks/c/pthread-divine/ring_2w1r-1.i [2023-11-06 22:52:08,464 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2004099a-1b31-49a3-a6e3-82a4256bba2d/bin/uautomizer-verify-WvqO1wxjHP/data/f3ef43cb5/fb140d0f6fce4f1580b0511f28160bc2/FLAG7ec407bfd [2023-11-06 22:52:08,479 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2004099a-1b31-49a3-a6e3-82a4256bba2d/bin/uautomizer-verify-WvqO1wxjHP/data/f3ef43cb5/fb140d0f6fce4f1580b0511f28160bc2 [2023-11-06 22:52:08,482 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-06 22:52:08,483 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-06 22:52:08,485 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-06 22:52:08,485 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-06 22:52:08,491 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-06 22:52:08,491 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:52:08" (1/1) ... [2023-11-06 22:52:08,492 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@25481629 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:08, skipping insertion in model container [2023-11-06 22:52:08,493 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:52:08" (1/1) ... [2023-11-06 22:52:08,576 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-06 22:52:08,749 WARN L635 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2023-11-06 22:52:09,265 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 22:52:09,285 INFO L202 MainTranslator]: Completed pre-run [2023-11-06 22:52:09,308 WARN L635 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2023-11-06 22:52:09,365 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 22:52:09,441 WARN L672 CHandler]: The function __builtin_bswap16 is called, but not defined or handled by StandardFunctionHandler. [2023-11-06 22:52:09,449 INFO L206 MainTranslator]: Completed translation [2023-11-06 22:52:09,449 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:09 WrapperNode [2023-11-06 22:52:09,450 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-06 22:52:09,451 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-06 22:52:09,451 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-06 22:52:09,451 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-06 22:52:09,459 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:09" (1/1) ... [2023-11-06 22:52:09,504 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:09" (1/1) ... [2023-11-06 22:52:09,556 INFO L138 Inliner]: procedures = 310, calls = 77, calls flagged for inlining = 17, calls inlined = 12, statements flattened = 217 [2023-11-06 22:52:09,557 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-06 22:52:09,557 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-06 22:52:09,557 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-06 22:52:09,558 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-06 22:52:09,568 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:09" (1/1) ... [2023-11-06 22:52:09,569 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:09" (1/1) ... [2023-11-06 22:52:09,584 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:09" (1/1) ... [2023-11-06 22:52:09,584 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:09" (1/1) ... [2023-11-06 22:52:09,617 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:09" (1/1) ... [2023-11-06 22:52:09,621 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:09" (1/1) ... [2023-11-06 22:52:09,624 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:09" (1/1) ... [2023-11-06 22:52:09,626 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:09" (1/1) ... [2023-11-06 22:52:09,630 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-06 22:52:09,631 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-06 22:52:09,631 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-06 22:52:09,631 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-06 22:52:09,642 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:09" (1/1) ... [2023-11-06 22:52:09,648 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 22:52:09,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2004099a-1b31-49a3-a6e3-82a4256bba2d/bin/uautomizer-verify-WvqO1wxjHP/z3 [2023-11-06 22:52:09,678 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2004099a-1b31-49a3-a6e3-82a4256bba2d/bin/uautomizer-verify-WvqO1wxjHP/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-06 22:52:09,716 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2004099a-1b31-49a3-a6e3-82a4256bba2d/bin/uautomizer-verify-WvqO1wxjHP/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-06 22:52:09,725 INFO L130 BoogieDeclarations]: Found specification of procedure reader_two [2023-11-06 22:52:09,726 INFO L138 BoogieDeclarations]: Found implementation of procedure reader_two [2023-11-06 22:52:09,726 INFO L130 BoogieDeclarations]: Found specification of procedure writer_fn [2023-11-06 22:52:09,726 INFO L138 BoogieDeclarations]: Found implementation of procedure writer_fn [2023-11-06 22:52:09,726 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-06 22:52:09,726 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-06 22:52:09,726 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-06 22:52:09,727 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-06 22:52:09,727 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-11-06 22:52:09,727 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-06 22:52:09,727 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-06 22:52:09,727 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-06 22:52:09,727 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-06 22:52:09,730 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-11-06 22:52:09,955 INFO L236 CfgBuilder]: Building ICFG [2023-11-06 22:52:09,961 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-06 22:52:10,548 INFO L277 CfgBuilder]: Performing block encoding [2023-11-06 22:52:10,559 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-06 22:52:10,559 INFO L302 CfgBuilder]: Removed 6 assume(true) statements. [2023-11-06 22:52:10,562 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:52:10 BoogieIcfgContainer [2023-11-06 22:52:10,562 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-06 22:52:10,565 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-06 22:52:10,565 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-06 22:52:10,568 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-06 22:52:10,569 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 10:52:08" (1/3) ... [2023-11-06 22:52:10,569 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33f09bfb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:52:10, skipping insertion in model container [2023-11-06 22:52:10,569 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:52:09" (2/3) ... [2023-11-06 22:52:10,570 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33f09bfb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:52:10, skipping insertion in model container [2023-11-06 22:52:10,570 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:52:10" (3/3) ... [2023-11-06 22:52:10,571 INFO L112 eAbstractionObserver]: Analyzing ICFG ring_2w1r-1.i [2023-11-06 22:52:10,589 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-06 22:52:10,589 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 61 error locations. [2023-11-06 22:52:10,589 INFO L519 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-11-06 22:52:10,741 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-11-06 22:52:10,791 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 298 places, 312 transitions, 638 flow [2023-11-06 22:52:10,977 INFO L124 PetriNetUnfolderBase]: 21/310 cut-off events. [2023-11-06 22:52:10,978 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-11-06 22:52:11,007 INFO L83 FinitePrefix]: Finished finitePrefix Result has 319 conditions, 310 events. 21/310 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 948 event pairs, 0 based on Foata normal form. 0/228 useless extension candidates. Maximal degree in co-relation 250. Up to 2 conditions per place. [2023-11-06 22:52:11,008 INFO L82 GeneralOperation]: Start removeDead. Operand has 298 places, 312 transitions, 638 flow [2023-11-06 22:52:11,029 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 291 places, 305 transitions, 622 flow [2023-11-06 22:52:11,035 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-11-06 22:52:11,050 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 291 places, 305 transitions, 622 flow [2023-11-06 22:52:11,056 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 291 places, 305 transitions, 622 flow [2023-11-06 22:52:11,057 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 291 places, 305 transitions, 622 flow [2023-11-06 22:52:11,155 INFO L124 PetriNetUnfolderBase]: 21/305 cut-off events. [2023-11-06 22:52:11,156 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-11-06 22:52:11,160 INFO L83 FinitePrefix]: Finished finitePrefix Result has 314 conditions, 305 events. 21/305 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 920 event pairs, 0 based on Foata normal form. 0/224 useless extension candidates. Maximal degree in co-relation 250. Up to 2 conditions per place. [2023-11-06 22:52:11,189 INFO L119 LiptonReduction]: Number of co-enabled transitions 36864 [2023-11-06 22:52:22,931 INFO L134 LiptonReduction]: Checked pairs total: 85651 [2023-11-06 22:52:22,931 INFO L136 LiptonReduction]: Total number of compositions: 325 [2023-11-06 22:52:22,949 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-06 22:52:22,956 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;@6883ee6a, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-11-06 22:52:22,956 INFO L358 AbstractCegarLoop]: Starting to check reachability of 99 error locations. [2023-11-06 22:52:22,958 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-11-06 22:52:22,958 INFO L124 PetriNetUnfolderBase]: 0/0 cut-off events. [2023-11-06 22:52:22,958 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-06 22:52:22,959 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-06 22:52:22,959 INFO L208 CegarLoopForPetriNet]: trace histogram [1] [2023-11-06 22:52:22,960 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2023-11-06 22:52:22,965 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 22:52:22,965 INFO L85 PathProgramCache]: Analyzing trace with hash 1249, now seen corresponding path program 1 times [2023-11-06 22:52:22,975 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 22:52:22,976 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1647720941] [2023-11-06 22:52:22,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 22:52:22,977 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 22:52:23,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 22:52:23,122 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 22:52:23,122 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 22:52:23,123 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1647720941] [2023-11-06 22:52:23,124 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1647720941] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 22:52:23,124 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 22:52:23,125 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [0] imperfect sequences [] total 0 [2023-11-06 22:52:23,127 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506741989] [2023-11-06 22:52:23,127 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 22:52:23,137 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-06 22:52:23,142 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 22:52:23,170 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-06 22:52:23,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-06 22:52:23,177 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 294 out of 637 [2023-11-06 22:52:23,184 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 113 places, 117 transitions, 246 flow. Second operand has 2 states, 2 states have (on average 294.5) internal successors, (589), 2 states have internal predecessors, (589), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:23,184 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-06 22:52:23,185 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 294 of 637 [2023-11-06 22:52:23,186 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-06 22:52:24,592 INFO L124 PetriNetUnfolderBase]: 4659/7585 cut-off events. [2023-11-06 22:52:24,592 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2023-11-06 22:52:24,606 INFO L83 FinitePrefix]: Finished finitePrefix Result has 14222 conditions, 7585 events. 4659/7585 cut-off events. For 30/30 co-relation queries the response was YES. Maximal size of possible extension queue 400. Compared 51655 event pairs, 3258 based on Foata normal form. 562/4575 useless extension candidates. Maximal degree in co-relation 14080. Up to 6566 conditions per place. [2023-11-06 22:52:24,675 INFO L140 encePairwiseOnDemand]: 618/637 looper letters, 59 selfloop transitions, 0 changer transitions 0/98 dead transitions. [2023-11-06 22:52:24,675 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 99 places, 98 transitions, 326 flow [2023-11-06 22:52:24,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-06 22:52:24,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2023-11-06 22:52:24,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 666 transitions. [2023-11-06 22:52:24,698 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5227629513343799 [2023-11-06 22:52:24,699 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 666 transitions. [2023-11-06 22:52:24,699 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 666 transitions. [2023-11-06 22:52:24,703 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-06 22:52:24,706 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 666 transitions. [2023-11-06 22:52:24,712 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 333.0) internal successors, (666), 2 states have internal predecessors, (666), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:24,721 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 637.0) internal successors, (1911), 3 states have internal predecessors, (1911), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:24,723 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 637.0) internal successors, (1911), 3 states have internal predecessors, (1911), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:24,725 INFO L175 Difference]: Start difference. First operand has 113 places, 117 transitions, 246 flow. Second operand 2 states and 666 transitions. [2023-11-06 22:52:24,726 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 99 places, 98 transitions, 326 flow [2023-11-06 22:52:24,732 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 95 places, 98 transitions, 318 flow, removed 0 selfloop flow, removed 4 redundant places. [2023-11-06 22:52:24,736 INFO L231 Difference]: Finished difference. Result has 95 places, 98 transitions, 200 flow [2023-11-06 22:52:24,738 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=637, PETRI_DIFFERENCE_MINUEND_FLOW=200, PETRI_DIFFERENCE_MINUEND_PLACES=94, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=98, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=98, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=200, PETRI_PLACES=95, PETRI_TRANSITIONS=98} [2023-11-06 22:52:24,743 INFO L281 CegarLoopForPetriNet]: 113 programPoint places, -18 predicate places. [2023-11-06 22:52:24,743 INFO L495 AbstractCegarLoop]: Abstraction has has 95 places, 98 transitions, 200 flow [2023-11-06 22:52:24,744 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 294.5) internal successors, (589), 2 states have internal predecessors, (589), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:24,744 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-06 22:52:24,744 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1] [2023-11-06 22:52:24,744 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-06 22:52:24,745 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2023-11-06 22:52:24,745 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 22:52:24,745 INFO L85 PathProgramCache]: Analyzing trace with hash 1227322, now seen corresponding path program 1 times [2023-11-06 22:52:24,746 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 22:52:24,746 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2080444366] [2023-11-06 22:52:24,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 22:52:24,746 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 22:52:24,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 22:52:25,022 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 22:52:25,022 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 22:52:25,023 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2080444366] [2023-11-06 22:52:25,023 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2080444366] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 22:52:25,023 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 22:52:25,023 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-06 22:52:25,024 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003725852] [2023-11-06 22:52:25,024 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 22:52:25,025 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 22:52:25,025 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 22:52:25,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 22:52:25,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 22:52:25,191 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 282 out of 637 [2023-11-06 22:52:25,192 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 95 places, 98 transitions, 200 flow. Second operand has 3 states, 3 states have (on average 283.0) internal successors, (849), 3 states have internal predecessors, (849), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:25,193 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-06 22:52:25,193 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 282 of 637 [2023-11-06 22:52:25,193 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-06 22:52:26,384 INFO L124 PetriNetUnfolderBase]: 4728/7704 cut-off events. [2023-11-06 22:52:26,384 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-06 22:52:26,397 INFO L83 FinitePrefix]: Finished finitePrefix Result has 14423 conditions, 7704 events. 4728/7704 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 405. Compared 52205 event pairs, 3161 based on Foata normal form. 0/4124 useless extension candidates. Maximal degree in co-relation 14420. Up to 6363 conditions per place. [2023-11-06 22:52:26,447 INFO L140 encePairwiseOnDemand]: 630/637 looper letters, 78 selfloop transitions, 5 changer transitions 0/122 dead transitions. [2023-11-06 22:52:26,447 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 97 places, 122 transitions, 416 flow [2023-11-06 22:52:26,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 22:52:26,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-06 22:52:26,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 931 transitions. [2023-11-06 22:52:26,453 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.48717948717948717 [2023-11-06 22:52:26,453 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 931 transitions. [2023-11-06 22:52:26,453 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 931 transitions. [2023-11-06 22:52:26,454 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-06 22:52:26,454 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 931 transitions. [2023-11-06 22:52:26,457 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 310.3333333333333) internal successors, (931), 3 states have internal predecessors, (931), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:26,463 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 637.0) internal successors, (2548), 4 states have internal predecessors, (2548), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:26,466 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 637.0) internal successors, (2548), 4 states have internal predecessors, (2548), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:26,466 INFO L175 Difference]: Start difference. First operand has 95 places, 98 transitions, 200 flow. Second operand 3 states and 931 transitions. [2023-11-06 22:52:26,467 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 97 places, 122 transitions, 416 flow [2023-11-06 22:52:26,471 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 97 places, 122 transitions, 416 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-11-06 22:52:26,475 INFO L231 Difference]: Finished difference. Result has 99 places, 100 transitions, 232 flow [2023-11-06 22:52:26,476 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=637, PETRI_DIFFERENCE_MINUEND_FLOW=200, PETRI_DIFFERENCE_MINUEND_PLACES=95, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=98, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=93, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=232, PETRI_PLACES=99, PETRI_TRANSITIONS=100} [2023-11-06 22:52:26,477 INFO L281 CegarLoopForPetriNet]: 113 programPoint places, -14 predicate places. [2023-11-06 22:52:26,477 INFO L495 AbstractCegarLoop]: Abstraction has has 99 places, 100 transitions, 232 flow [2023-11-06 22:52:26,479 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 283.0) internal successors, (849), 3 states have internal predecessors, (849), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:26,480 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-06 22:52:26,480 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1] [2023-11-06 22:52:26,480 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-06 22:52:26,485 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2023-11-06 22:52:26,486 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 22:52:26,486 INFO L85 PathProgramCache]: Analyzing trace with hash 1227323, now seen corresponding path program 1 times [2023-11-06 22:52:26,487 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 22:52:26,487 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [347036719] [2023-11-06 22:52:26,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 22:52:26,488 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 22:52:26,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 22:52:26,733 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 22:52:26,733 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 22:52:26,733 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [347036719] [2023-11-06 22:52:26,734 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [347036719] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 22:52:26,734 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 22:52:26,734 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 22:52:26,734 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [26820370] [2023-11-06 22:52:26,734 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 22:52:26,735 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-06 22:52:26,735 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 22:52:26,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-06 22:52:26,736 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-06 22:52:27,023 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 284 out of 637 [2023-11-06 22:52:27,025 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 99 places, 100 transitions, 232 flow. Second operand has 4 states, 4 states have (on average 284.75) internal successors, (1139), 4 states have internal predecessors, (1139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:27,025 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-06 22:52:27,026 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 284 of 637 [2023-11-06 22:52:27,026 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-06 22:52:28,249 INFO L124 PetriNetUnfolderBase]: 4137/6843 cut-off events. [2023-11-06 22:52:28,250 INFO L125 PetriNetUnfolderBase]: For 228/228 co-relation queries the response was YES. [2023-11-06 22:52:28,264 INFO L83 FinitePrefix]: Finished finitePrefix Result has 13056 conditions, 6843 events. 4137/6843 cut-off events. For 228/228 co-relation queries the response was YES. Maximal size of possible extension queue 280. Compared 43051 event pairs, 102 based on Foata normal form. 41/4297 useless extension candidates. Maximal degree in co-relation 13051. Up to 5841 conditions per place. [2023-11-06 22:52:28,302 INFO L140 encePairwiseOnDemand]: 632/637 looper letters, 76 selfloop transitions, 3 changer transitions 0/118 dead transitions. [2023-11-06 22:52:28,302 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 100 places, 118 transitions, 429 flow [2023-11-06 22:52:28,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 22:52:28,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-11-06 22:52:28,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 1216 transitions. [2023-11-06 22:52:28,308 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4772370486656201 [2023-11-06 22:52:28,308 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 1216 transitions. [2023-11-06 22:52:28,308 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 1216 transitions. [2023-11-06 22:52:28,309 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-06 22:52:28,310 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 1216 transitions. [2023-11-06 22:52:28,314 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 304.0) internal successors, (1216), 4 states have internal predecessors, (1216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:28,320 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 637.0) internal successors, (3185), 5 states have internal predecessors, (3185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:28,323 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 637.0) internal successors, (3185), 5 states have internal predecessors, (3185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:28,323 INFO L175 Difference]: Start difference. First operand has 99 places, 100 transitions, 232 flow. Second operand 4 states and 1216 transitions. [2023-11-06 22:52:28,323 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 100 places, 118 transitions, 429 flow [2023-11-06 22:52:28,330 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 98 places, 118 transitions, 419 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-11-06 22:52:28,334 INFO L231 Difference]: Finished difference. Result has 98 places, 98 transitions, 224 flow [2023-11-06 22:52:28,334 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=637, PETRI_DIFFERENCE_MINUEND_FLOW=218, PETRI_DIFFERENCE_MINUEND_PLACES=95, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=98, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=95, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=224, PETRI_PLACES=98, PETRI_TRANSITIONS=98} [2023-11-06 22:52:28,336 INFO L281 CegarLoopForPetriNet]: 113 programPoint places, -15 predicate places. [2023-11-06 22:52:28,339 INFO L495 AbstractCegarLoop]: Abstraction has has 98 places, 98 transitions, 224 flow [2023-11-06 22:52:28,341 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 284.75) internal successors, (1139), 4 states have internal predecessors, (1139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:28,341 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-06 22:52:28,341 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-06 22:52:28,341 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-06 22:52:28,342 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2023-11-06 22:52:28,342 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 22:52:28,342 INFO L85 PathProgramCache]: Analyzing trace with hash -2090594663, now seen corresponding path program 1 times [2023-11-06 22:52:28,342 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 22:52:28,343 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387358748] [2023-11-06 22:52:28,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 22:52:28,344 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 22:52:28,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 22:52:28,422 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 22:52:28,422 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 22:52:28,423 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387358748] [2023-11-06 22:52:28,423 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [387358748] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 22:52:28,425 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 22:52:28,425 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 22:52:28,425 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865481332] [2023-11-06 22:52:28,426 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 22:52:28,427 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 22:52:28,427 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 22:52:28,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 22:52:28,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 22:52:28,441 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 288 out of 637 [2023-11-06 22:52:28,443 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 98 places, 98 transitions, 224 flow. Second operand has 3 states, 3 states have (on average 290.0) internal successors, (870), 3 states have internal predecessors, (870), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:28,443 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-06 22:52:28,444 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 288 of 637 [2023-11-06 22:52:28,444 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-06 22:52:30,448 INFO L124 PetriNetUnfolderBase]: 7314/12692 cut-off events. [2023-11-06 22:52:30,448 INFO L125 PetriNetUnfolderBase]: For 274/299 co-relation queries the response was YES. [2023-11-06 22:52:30,472 INFO L83 FinitePrefix]: Finished finitePrefix Result has 23324 conditions, 12692 events. 7314/12692 cut-off events. For 274/299 co-relation queries the response was YES. Maximal size of possible extension queue 566. Compared 99391 event pairs, 3756 based on Foata normal form. 0/7339 useless extension candidates. Maximal degree in co-relation 23319. Up to 6595 conditions per place. [2023-11-06 22:52:30,554 INFO L140 encePairwiseOnDemand]: 632/637 looper letters, 100 selfloop transitions, 2 changer transitions 0/141 dead transitions. [2023-11-06 22:52:30,554 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 100 places, 141 transitions, 518 flow [2023-11-06 22:52:30,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 22:52:30,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-06 22:52:30,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 967 transitions. [2023-11-06 22:52:30,559 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5060177917320774 [2023-11-06 22:52:30,559 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 967 transitions. [2023-11-06 22:52:30,560 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 967 transitions. [2023-11-06 22:52:30,560 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-06 22:52:30,561 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 967 transitions. [2023-11-06 22:52:30,564 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 322.3333333333333) internal successors, (967), 3 states have internal predecessors, (967), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:30,569 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 637.0) internal successors, (2548), 4 states have internal predecessors, (2548), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:30,571 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 637.0) internal successors, (2548), 4 states have internal predecessors, (2548), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:30,571 INFO L175 Difference]: Start difference. First operand has 98 places, 98 transitions, 224 flow. Second operand 3 states and 967 transitions. [2023-11-06 22:52:30,571 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 100 places, 141 transitions, 518 flow [2023-11-06 22:52:30,577 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 97 places, 141 transitions, 510 flow, removed 0 selfloop flow, removed 3 redundant places. [2023-11-06 22:52:30,583 INFO L231 Difference]: Finished difference. Result has 98 places, 99 transitions, 234 flow [2023-11-06 22:52:30,583 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=637, PETRI_DIFFERENCE_MINUEND_FLOW=218, PETRI_DIFFERENCE_MINUEND_PLACES=95, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=98, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=96, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=234, PETRI_PLACES=98, PETRI_TRANSITIONS=99} [2023-11-06 22:52:30,585 INFO L281 CegarLoopForPetriNet]: 113 programPoint places, -15 predicate places. [2023-11-06 22:52:30,585 INFO L495 AbstractCegarLoop]: Abstraction has has 98 places, 99 transitions, 234 flow [2023-11-06 22:52:30,586 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 290.0) internal successors, (870), 3 states have internal predecessors, (870), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:30,586 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-06 22:52:30,587 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-06 22:52:30,587 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-06 22:52:30,587 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting writer_fnErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2023-11-06 22:52:30,587 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 22:52:30,588 INFO L85 PathProgramCache]: Analyzing trace with hash -384029928, now seen corresponding path program 1 times [2023-11-06 22:52:30,588 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 22:52:30,589 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [874462723] [2023-11-06 22:52:30,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 22:52:30,589 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 22:52:30,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 22:52:30,723 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 22:52:30,723 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 22:52:30,724 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [874462723] [2023-11-06 22:52:30,724 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [874462723] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 22:52:30,724 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 22:52:30,724 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-06 22:52:30,725 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745863864] [2023-11-06 22:52:30,725 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 22:52:30,725 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-06 22:52:30,725 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 22:52:30,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-06 22:52:30,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-06 22:52:31,260 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 270 out of 637 [2023-11-06 22:52:31,263 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 98 places, 99 transitions, 234 flow. Second operand has 6 states, 6 states have (on average 271.1666666666667) internal successors, (1627), 6 states have internal predecessors, (1627), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:31,263 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-06 22:52:31,263 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 270 of 637 [2023-11-06 22:52:31,263 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-06 22:52:33,846 INFO L124 PetriNetUnfolderBase]: 10422/18742 cut-off events. [2023-11-06 22:52:33,846 INFO L125 PetriNetUnfolderBase]: For 1979/2012 co-relation queries the response was YES. [2023-11-06 22:52:33,885 INFO L83 FinitePrefix]: Finished finitePrefix Result has 36260 conditions, 18742 events. 10422/18742 cut-off events. For 1979/2012 co-relation queries the response was YES. Maximal size of possible extension queue 785. Compared 162659 event pairs, 1661 based on Foata normal form. 0/12848 useless extension candidates. Maximal degree in co-relation 36254. Up to 8120 conditions per place. [2023-11-06 22:52:33,981 INFO L140 encePairwiseOnDemand]: 619/637 looper letters, 207 selfloop transitions, 16 changer transitions 0/253 dead transitions. [2023-11-06 22:52:33,982 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 104 places, 253 transitions, 1058 flow [2023-11-06 22:52:33,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-06 22:52:33,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-11-06 22:52:33,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 2118 transitions. [2023-11-06 22:52:33,990 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4749943933617403 [2023-11-06 22:52:33,991 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 2118 transitions. [2023-11-06 22:52:33,991 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 2118 transitions. [2023-11-06 22:52:33,993 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-06 22:52:33,993 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 2118 transitions. [2023-11-06 22:52:33,999 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 302.57142857142856) internal successors, (2118), 7 states have internal predecessors, (2118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:34,010 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 637.0) internal successors, (5096), 8 states have internal predecessors, (5096), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:34,014 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 637.0) internal successors, (5096), 8 states have internal predecessors, (5096), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:34,014 INFO L175 Difference]: Start difference. First operand has 98 places, 99 transitions, 234 flow. Second operand 7 states and 2118 transitions. [2023-11-06 22:52:34,015 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 104 places, 253 transitions, 1058 flow [2023-11-06 22:52:34,027 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 103 places, 253 transitions, 1048 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-11-06 22:52:34,031 INFO L231 Difference]: Finished difference. Result has 109 places, 113 transitions, 375 flow [2023-11-06 22:52:34,032 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=637, PETRI_DIFFERENCE_MINUEND_FLOW=232, PETRI_DIFFERENCE_MINUEND_PLACES=97, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=99, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=87, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=375, PETRI_PLACES=109, PETRI_TRANSITIONS=113} [2023-11-06 22:52:34,032 INFO L281 CegarLoopForPetriNet]: 113 programPoint places, -4 predicate places. [2023-11-06 22:52:34,033 INFO L495 AbstractCegarLoop]: Abstraction has has 109 places, 113 transitions, 375 flow [2023-11-06 22:52:34,034 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 271.1666666666667) internal successors, (1627), 6 states have internal predecessors, (1627), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:34,035 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-06 22:52:34,035 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-06 22:52:34,035 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-06 22:52:34,035 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting writer_fnErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2023-11-06 22:52:34,036 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 22:52:34,036 INFO L85 PathProgramCache]: Analyzing trace with hash -384029927, now seen corresponding path program 1 times [2023-11-06 22:52:34,036 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 22:52:34,036 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [180935359] [2023-11-06 22:52:34,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 22:52:34,037 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 22:52:34,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 22:52:34,193 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 22:52:34,193 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 22:52:34,194 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [180935359] [2023-11-06 22:52:34,194 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [180935359] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 22:52:34,194 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 22:52:34,194 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-06 22:52:34,194 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972675426] [2023-11-06 22:52:34,195 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 22:52:34,195 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-06 22:52:34,195 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 22:52:34,196 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-06 22:52:34,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-06 22:52:34,900 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 278 out of 637 [2023-11-06 22:52:34,902 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 109 places, 113 transitions, 375 flow. Second operand has 6 states, 6 states have (on average 279.1666666666667) internal successors, (1675), 6 states have internal predecessors, (1675), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:34,902 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-06 22:52:34,902 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 278 of 637 [2023-11-06 22:52:34,903 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-06 22:52:37,580 INFO L124 PetriNetUnfolderBase]: 12423/20024 cut-off events. [2023-11-06 22:52:37,580 INFO L125 PetriNetUnfolderBase]: For 8196/10404 co-relation queries the response was YES. [2023-11-06 22:52:37,620 INFO L83 FinitePrefix]: Finished finitePrefix Result has 45407 conditions, 20024 events. 12423/20024 cut-off events. For 8196/10404 co-relation queries the response was YES. Maximal size of possible extension queue 920. Compared 156768 event pairs, 8834 based on Foata normal form. 113/13360 useless extension candidates. Maximal degree in co-relation 45396. Up to 17302 conditions per place. [2023-11-06 22:52:37,722 INFO L140 encePairwiseOnDemand]: 626/637 looper letters, 113 selfloop transitions, 9 changer transitions 0/159 dead transitions. [2023-11-06 22:52:37,722 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 114 places, 159 transitions, 772 flow [2023-11-06 22:52:37,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 22:52:37,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-11-06 22:52:37,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1778 transitions. [2023-11-06 22:52:37,731 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4652014652014652 [2023-11-06 22:52:37,731 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1778 transitions. [2023-11-06 22:52:37,731 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1778 transitions. [2023-11-06 22:52:37,733 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-06 22:52:37,733 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1778 transitions. [2023-11-06 22:52:37,738 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 296.3333333333333) internal successors, (1778), 6 states have internal predecessors, (1778), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:37,745 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 637.0) internal successors, (4459), 7 states have internal predecessors, (4459), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:37,747 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 637.0) internal successors, (4459), 7 states have internal predecessors, (4459), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:37,748 INFO L175 Difference]: Start difference. First operand has 109 places, 113 transitions, 375 flow. Second operand 6 states and 1778 transitions. [2023-11-06 22:52:37,748 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 114 places, 159 transitions, 772 flow [2023-11-06 22:52:37,785 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 114 places, 159 transitions, 772 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-11-06 22:52:37,789 INFO L231 Difference]: Finished difference. Result has 118 places, 120 transitions, 455 flow [2023-11-06 22:52:37,790 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=637, PETRI_DIFFERENCE_MINUEND_FLOW=375, PETRI_DIFFERENCE_MINUEND_PLACES=109, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=113, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=107, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=455, PETRI_PLACES=118, PETRI_TRANSITIONS=120} [2023-11-06 22:52:37,793 INFO L281 CegarLoopForPetriNet]: 113 programPoint places, 5 predicate places. [2023-11-06 22:52:37,793 INFO L495 AbstractCegarLoop]: Abstraction has has 118 places, 120 transitions, 455 flow [2023-11-06 22:52:37,794 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 279.1666666666667) internal successors, (1675), 6 states have internal predecessors, (1675), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:37,794 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-06 22:52:37,795 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-06 22:52:37,795 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-06 22:52:37,795 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2023-11-06 22:52:37,795 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 22:52:37,796 INFO L85 PathProgramCache]: Analyzing trace with hash -383924628, now seen corresponding path program 1 times [2023-11-06 22:52:37,796 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 22:52:37,796 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1934793040] [2023-11-06 22:52:37,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 22:52:37,797 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 22:52:38,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 22:52:38,118 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 22:52:38,119 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 22:52:38,119 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1934793040] [2023-11-06 22:52:38,119 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1934793040] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 22:52:38,119 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 22:52:38,120 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-06 22:52:38,120 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [363584511] [2023-11-06 22:52:38,120 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 22:52:38,120 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-06 22:52:38,121 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 22:52:38,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-06 22:52:38,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-06 22:52:38,429 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 268 out of 637 [2023-11-06 22:52:38,430 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 118 places, 120 transitions, 455 flow. Second operand has 5 states, 5 states have (on average 269.4) internal successors, (1347), 5 states have internal predecessors, (1347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:38,430 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-06 22:52:38,431 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 268 of 637 [2023-11-06 22:52:38,431 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-06 22:52:40,966 INFO L124 PetriNetUnfolderBase]: 10787/18761 cut-off events. [2023-11-06 22:52:40,966 INFO L125 PetriNetUnfolderBase]: For 17368/20885 co-relation queries the response was YES. [2023-11-06 22:52:41,021 INFO L83 FinitePrefix]: Finished finitePrefix Result has 45605 conditions, 18761 events. 10787/18761 cut-off events. For 17368/20885 co-relation queries the response was YES. Maximal size of possible extension queue 822. Compared 157501 event pairs, 1605 based on Foata normal form. 69/14040 useless extension candidates. Maximal degree in co-relation 45589. Up to 8120 conditions per place. [2023-11-06 22:52:41,107 INFO L140 encePairwiseOnDemand]: 617/637 looper letters, 189 selfloop transitions, 24 changer transitions 0/246 dead transitions. [2023-11-06 22:52:41,107 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 123 places, 246 transitions, 1329 flow [2023-11-06 22:52:41,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 22:52:41,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-11-06 22:52:41,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1798 transitions. [2023-11-06 22:52:41,122 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.47043432757718473 [2023-11-06 22:52:41,122 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1798 transitions. [2023-11-06 22:52:41,122 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1798 transitions. [2023-11-06 22:52:41,126 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-06 22:52:41,127 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1798 transitions. [2023-11-06 22:52:41,138 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 299.6666666666667) internal successors, (1798), 6 states have internal predecessors, (1798), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:41,148 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 637.0) internal successors, (4459), 7 states have internal predecessors, (4459), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:41,150 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 637.0) internal successors, (4459), 7 states have internal predecessors, (4459), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:41,151 INFO L175 Difference]: Start difference. First operand has 118 places, 120 transitions, 455 flow. Second operand 6 states and 1798 transitions. [2023-11-06 22:52:41,151 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 123 places, 246 transitions, 1329 flow [2023-11-06 22:52:41,351 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 122 places, 246 transitions, 1318 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-11-06 22:52:41,355 INFO L231 Difference]: Finished difference. Result has 127 places, 139 transitions, 676 flow [2023-11-06 22:52:41,355 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=637, PETRI_DIFFERENCE_MINUEND_FLOW=450, PETRI_DIFFERENCE_MINUEND_PLACES=117, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=120, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=103, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=676, PETRI_PLACES=127, PETRI_TRANSITIONS=139} [2023-11-06 22:52:41,356 INFO L281 CegarLoopForPetriNet]: 113 programPoint places, 14 predicate places. [2023-11-06 22:52:41,357 INFO L495 AbstractCegarLoop]: Abstraction has has 127 places, 139 transitions, 676 flow [2023-11-06 22:52:41,358 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 269.4) internal successors, (1347), 5 states have internal predecessors, (1347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:41,358 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-06 22:52:41,358 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-06 22:52:41,358 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-06 22:52:41,359 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2023-11-06 22:52:41,359 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 22:52:41,359 INFO L85 PathProgramCache]: Analyzing trace with hash -383924627, now seen corresponding path program 1 times [2023-11-06 22:52:41,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 22:52:41,360 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [774057935] [2023-11-06 22:52:41,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 22:52:41,360 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 22:52:41,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 22:52:41,558 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 22:52:41,558 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 22:52:41,559 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [774057935] [2023-11-06 22:52:41,559 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [774057935] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 22:52:41,559 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 22:52:41,559 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-06 22:52:41,560 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578288828] [2023-11-06 22:52:41,560 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 22:52:41,561 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-06 22:52:41,561 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 22:52:41,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-06 22:52:41,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-06 22:52:42,009 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 276 out of 637 [2023-11-06 22:52:42,011 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 127 places, 139 transitions, 676 flow. Second operand has 5 states, 5 states have (on average 277.4) internal successors, (1387), 5 states have internal predecessors, (1387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:42,011 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-06 22:52:42,011 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 276 of 637 [2023-11-06 22:52:42,012 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-06 22:52:45,187 INFO L124 PetriNetUnfolderBase]: 12885/20087 cut-off events. [2023-11-06 22:52:45,187 INFO L125 PetriNetUnfolderBase]: For 29660/39511 co-relation queries the response was YES. [2023-11-06 22:52:45,257 INFO L83 FinitePrefix]: Finished finitePrefix Result has 58684 conditions, 20087 events. 12885/20087 cut-off events. For 29660/39511 co-relation queries the response was YES. Maximal size of possible extension queue 979. Compared 150314 event pairs, 8564 based on Foata normal form. 146/14723 useless extension candidates. Maximal degree in co-relation 58664. Up to 17889 conditions per place. [2023-11-06 22:52:45,373 INFO L140 encePairwiseOnDemand]: 624/637 looper letters, 121 selfloop transitions, 17 changer transitions 0/178 dead transitions. [2023-11-06 22:52:45,373 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 131 places, 178 transitions, 1152 flow [2023-11-06 22:52:45,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-06 22:52:45,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-11-06 22:52:45,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 1485 transitions. [2023-11-06 22:52:45,384 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4662480376766091 [2023-11-06 22:52:45,384 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 1485 transitions. [2023-11-06 22:52:45,384 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 1485 transitions. [2023-11-06 22:52:45,386 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-06 22:52:45,386 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 1485 transitions. [2023-11-06 22:52:45,391 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 297.0) internal successors, (1485), 5 states have internal predecessors, (1485), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:45,399 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 637.0) internal successors, (3822), 6 states have internal predecessors, (3822), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:45,409 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 637.0) internal successors, (3822), 6 states have internal predecessors, (3822), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:45,417 INFO L175 Difference]: Start difference. First operand has 127 places, 139 transitions, 676 flow. Second operand 5 states and 1485 transitions. [2023-11-06 22:52:45,418 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 131 places, 178 transitions, 1152 flow [2023-11-06 22:52:45,563 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 131 places, 178 transitions, 1152 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-11-06 22:52:45,566 INFO L231 Difference]: Finished difference. Result has 134 places, 151 transitions, 823 flow [2023-11-06 22:52:45,566 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=637, PETRI_DIFFERENCE_MINUEND_FLOW=676, PETRI_DIFFERENCE_MINUEND_PLACES=127, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=139, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=128, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=823, PETRI_PLACES=134, PETRI_TRANSITIONS=151} [2023-11-06 22:52:45,567 INFO L281 CegarLoopForPetriNet]: 113 programPoint places, 21 predicate places. [2023-11-06 22:52:45,567 INFO L495 AbstractCegarLoop]: Abstraction has has 134 places, 151 transitions, 823 flow [2023-11-06 22:52:45,568 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 277.4) internal successors, (1387), 5 states have internal predecessors, (1387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:45,568 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-06 22:52:45,569 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 22:52:45,569 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-06 22:52:45,569 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2023-11-06 22:52:45,570 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 22:52:45,570 INFO L85 PathProgramCache]: Analyzing trace with hash 1177123539, now seen corresponding path program 1 times [2023-11-06 22:52:45,570 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 22:52:45,570 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1144421266] [2023-11-06 22:52:45,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 22:52:45,571 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 22:52:45,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 22:52:45,796 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 22:52:45,797 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 22:52:45,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1144421266] [2023-11-06 22:52:45,797 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1144421266] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 22:52:45,798 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 22:52:45,798 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-06 22:52:45,798 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779924510] [2023-11-06 22:52:45,798 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 22:52:45,802 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-06 22:52:45,803 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 22:52:45,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-06 22:52:45,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-06 22:52:46,405 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 272 out of 637 [2023-11-06 22:52:46,407 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 134 places, 151 transitions, 823 flow. Second operand has 6 states, 6 states have (on average 273.3333333333333) internal successors, (1640), 6 states have internal predecessors, (1640), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:46,407 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-06 22:52:46,407 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 272 of 637 [2023-11-06 22:52:46,408 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-06 22:52:50,962 INFO L124 PetriNetUnfolderBase]: 18223/29599 cut-off events. [2023-11-06 22:52:50,963 INFO L125 PetriNetUnfolderBase]: For 52339/60217 co-relation queries the response was YES. [2023-11-06 22:52:51,084 INFO L83 FinitePrefix]: Finished finitePrefix Result has 91860 conditions, 29599 events. 18223/29599 cut-off events. For 52339/60217 co-relation queries the response was YES. Maximal size of possible extension queue 1143. Compared 238020 event pairs, 4492 based on Foata normal form. 2387/23955 useless extension candidates. Maximal degree in co-relation 91836. Up to 15433 conditions per place. [2023-11-06 22:52:51,233 INFO L140 encePairwiseOnDemand]: 622/637 looper letters, 213 selfloop transitions, 43 changer transitions 0/296 dead transitions. [2023-11-06 22:52:51,233 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 141 places, 296 transitions, 1951 flow [2023-11-06 22:52:51,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-06 22:52:51,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2023-11-06 22:52:51,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 2381 transitions. [2023-11-06 22:52:51,243 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.46722919937205654 [2023-11-06 22:52:51,243 INFO L72 ComplementDD]: Start complementDD. Operand 8 states and 2381 transitions. [2023-11-06 22:52:51,243 INFO L73 IsDeterministic]: Start isDeterministic. Operand 8 states and 2381 transitions. [2023-11-06 22:52:51,246 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-06 22:52:51,246 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 8 states and 2381 transitions. [2023-11-06 22:52:51,252 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 9 states, 8 states have (on average 297.625) internal successors, (2381), 8 states have internal predecessors, (2381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:51,261 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 9 states, 9 states have (on average 637.0) internal successors, (5733), 9 states have internal predecessors, (5733), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:51,263 INFO L81 ComplementDD]: Finished complementDD. Result has 9 states, 9 states have (on average 637.0) internal successors, (5733), 9 states have internal predecessors, (5733), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:51,263 INFO L175 Difference]: Start difference. First operand has 134 places, 151 transitions, 823 flow. Second operand 8 states and 2381 transitions. [2023-11-06 22:52:51,263 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 141 places, 296 transitions, 1951 flow [2023-11-06 22:52:51,416 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 140 places, 296 transitions, 1940 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-11-06 22:52:51,420 INFO L231 Difference]: Finished difference. Result has 144 places, 168 transitions, 1134 flow [2023-11-06 22:52:51,421 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=637, PETRI_DIFFERENCE_MINUEND_FLOW=812, PETRI_DIFFERENCE_MINUEND_PLACES=133, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=151, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=26, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=114, PETRI_DIFFERENCE_SUBTRAHEND_STATES=8, PETRI_FLOW=1134, PETRI_PLACES=144, PETRI_TRANSITIONS=168} [2023-11-06 22:52:51,422 INFO L281 CegarLoopForPetriNet]: 113 programPoint places, 31 predicate places. [2023-11-06 22:52:51,422 INFO L495 AbstractCegarLoop]: Abstraction has has 144 places, 168 transitions, 1134 flow [2023-11-06 22:52:51,423 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 273.3333333333333) internal successors, (1640), 6 states have internal predecessors, (1640), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:51,423 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-06 22:52:51,423 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 22:52:51,423 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-06 22:52:51,424 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting writer_fnErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2023-11-06 22:52:51,424 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 22:52:51,424 INFO L85 PathProgramCache]: Analyzing trace with hash 290438079, now seen corresponding path program 1 times [2023-11-06 22:52:51,424 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 22:52:51,425 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1471596972] [2023-11-06 22:52:51,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 22:52:51,425 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 22:52:51,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 22:52:51,611 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 22:52:51,611 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 22:52:51,611 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1471596972] [2023-11-06 22:52:51,612 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1471596972] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 22:52:51,612 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 22:52:51,612 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-06 22:52:51,612 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383268879] [2023-11-06 22:52:51,613 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 22:52:51,613 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-06 22:52:51,613 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 22:52:51,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-06 22:52:51,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-06 22:52:52,345 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 274 out of 637 [2023-11-06 22:52:52,347 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 144 places, 168 transitions, 1134 flow. Second operand has 7 states, 7 states have (on average 275.14285714285717) internal successors, (1926), 7 states have internal predecessors, (1926), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:52:52,348 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-06 22:52:52,348 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 274 of 637 [2023-11-06 22:52:52,348 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-06 22:52:59,927 INFO L124 PetriNetUnfolderBase]: 29383/46264 cut-off events. [2023-11-06 22:52:59,927 INFO L125 PetriNetUnfolderBase]: For 129355/155984 co-relation queries the response was YES. [2023-11-06 22:53:00,136 INFO L83 FinitePrefix]: Finished finitePrefix Result has 161264 conditions, 46264 events. 29383/46264 cut-off events. For 129355/155984 co-relation queries the response was YES. Maximal size of possible extension queue 1859. Compared 385513 event pairs, 8934 based on Foata normal form. 2534/35480 useless extension candidates. Maximal degree in co-relation 161236. Up to 26806 conditions per place. [2023-11-06 22:53:00,359 INFO L140 encePairwiseOnDemand]: 624/637 looper letters, 306 selfloop transitions, 50 changer transitions 0/396 dead transitions. [2023-11-06 22:53:00,359 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 154 places, 396 transitions, 3108 flow [2023-11-06 22:53:00,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-06 22:53:00,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2023-11-06 22:53:00,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 3285 transitions. [2023-11-06 22:53:00,368 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.46881689738832594 [2023-11-06 22:53:00,369 INFO L72 ComplementDD]: Start complementDD. Operand 11 states and 3285 transitions. [2023-11-06 22:53:00,369 INFO L73 IsDeterministic]: Start isDeterministic. Operand 11 states and 3285 transitions. [2023-11-06 22:53:00,371 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-06 22:53:00,372 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 11 states and 3285 transitions. [2023-11-06 22:53:00,379 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 12 states, 11 states have (on average 298.6363636363636) internal successors, (3285), 11 states have internal predecessors, (3285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:53:00,391 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 12 states, 12 states have (on average 637.0) internal successors, (7644), 12 states have internal predecessors, (7644), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:53:00,392 INFO L81 ComplementDD]: Finished complementDD. Result has 12 states, 12 states have (on average 637.0) internal successors, (7644), 12 states have internal predecessors, (7644), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:53:00,393 INFO L175 Difference]: Start difference. First operand has 144 places, 168 transitions, 1134 flow. Second operand 11 states and 3285 transitions. [2023-11-06 22:53:00,393 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 154 places, 396 transitions, 3108 flow [2023-11-06 22:53:02,146 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 152 places, 396 transitions, 3006 flow, removed 30 selfloop flow, removed 2 redundant places. [2023-11-06 22:53:02,153 INFO L231 Difference]: Finished difference. Result has 158 places, 185 transitions, 1453 flow [2023-11-06 22:53:02,154 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=637, PETRI_DIFFERENCE_MINUEND_FLOW=1086, PETRI_DIFFERENCE_MINUEND_PLACES=142, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=168, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=33, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=128, PETRI_DIFFERENCE_SUBTRAHEND_STATES=11, PETRI_FLOW=1453, PETRI_PLACES=158, PETRI_TRANSITIONS=185} [2023-11-06 22:53:02,155 INFO L281 CegarLoopForPetriNet]: 113 programPoint places, 45 predicate places. [2023-11-06 22:53:02,155 INFO L495 AbstractCegarLoop]: Abstraction has has 158 places, 185 transitions, 1453 flow [2023-11-06 22:53:02,156 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 275.14285714285717) internal successors, (1926), 7 states have internal predecessors, (1926), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:53:02,156 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-06 22:53:02,156 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 22:53:02,156 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-11-06 22:53:02,156 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting writer_fnErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2023-11-06 22:53:02,157 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 22:53:02,157 INFO L85 PathProgramCache]: Analyzing trace with hash 981291369, now seen corresponding path program 2 times [2023-11-06 22:53:02,157 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-06 22:53:02,157 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922541231] [2023-11-06 22:53:02,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 22:53:02,158 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 22:53:02,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 22:53:02,395 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 22:53:02,395 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-06 22:53:02,396 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922541231] [2023-11-06 22:53:02,396 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [922541231] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 22:53:02,396 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 22:53:02,396 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-06 22:53:02,397 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720988691] [2023-11-06 22:53:02,397 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 22:53:02,397 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-06 22:53:02,397 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-06 22:53:02,398 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-06 22:53:02,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-06 22:53:03,206 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 274 out of 637 [2023-11-06 22:53:03,208 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 158 places, 185 transitions, 1453 flow. Second operand has 7 states, 7 states have (on average 275.14285714285717) internal successors, (1926), 7 states have internal predecessors, (1926), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 22:53:03,208 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-06 22:53:03,208 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 274 of 637 [2023-11-06 22:53:03,208 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand