./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/weaver/chl-nzb-file-symm.wvr.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 527bcce2 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/weaver/chl-nzb-file-symm.wvr.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 48ddce9ee02b3ea4431cf137593b71facb450c3e223dbff4f116c3c0ac1377b5 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 20:57:24,766 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 20:57:24,875 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2023-11-21 20:57:24,881 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 20:57:24,882 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 20:57:24,933 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 20:57:24,935 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 20:57:24,936 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 20:57:24,937 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 20:57:24,942 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 20:57:24,943 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-21 20:57:24,943 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-21 20:57:24,944 INFO L153 SettingsManager]: * Use SBE=true [2023-11-21 20:57:24,946 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 20:57:24,946 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 20:57:24,947 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 20:57:24,947 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 20:57:24,947 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 20:57:24,948 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-21 20:57:24,948 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-21 20:57:24,949 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-21 20:57:24,950 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 20:57:24,950 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-21 20:57:24,950 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-21 20:57:24,951 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 20:57:24,951 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 20:57:24,952 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 20:57:24,952 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-21 20:57:24,953 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 20:57:24,953 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 20:57:24,954 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 20:57:24,954 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 20:57:24,955 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 20:57:24,955 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-21 20:57:24,955 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 20:57:24,955 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 20:57:24,956 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-21 20:57:24,956 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-21 20:57:24,956 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 20:57:24,957 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_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 48ddce9ee02b3ea4431cf137593b71facb450c3e223dbff4f116c3c0ac1377b5 [2023-11-21 20:57:25,249 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 20:57:25,285 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 20:57:25,288 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 20:57:25,289 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 20:57:25,290 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 20:57:25,291 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/../../sv-benchmarks/c/weaver/chl-nzb-file-symm.wvr.c [2023-11-21 20:57:28,562 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 20:57:28,812 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 20:57:28,813 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/sv-benchmarks/c/weaver/chl-nzb-file-symm.wvr.c [2023-11-21 20:57:28,823 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/data/77a4b7a6b/9c26f9ffb0e64423a2185e8ff99aea34/FLAG401ad6a7a [2023-11-21 20:57:28,839 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/data/77a4b7a6b/9c26f9ffb0e64423a2185e8ff99aea34 [2023-11-21 20:57:28,845 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 20:57:28,848 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 20:57:28,851 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 20:57:28,852 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 20:57:28,862 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 20:57:28,863 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 08:57:28" (1/1) ... [2023-11-21 20:57:28,864 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@52ba566a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:57:28, skipping insertion in model container [2023-11-21 20:57:28,865 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 08:57:28" (1/1) ... [2023-11-21 20:57:28,914 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 20:57:29,120 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 20:57:29,132 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 20:57:29,177 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 20:57:29,195 INFO L206 MainTranslator]: Completed translation [2023-11-21 20:57:29,196 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:57:29 WrapperNode [2023-11-21 20:57:29,196 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 20:57:29,197 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 20:57:29,197 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 20:57:29,197 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 20:57:29,205 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:57:29" (1/1) ... [2023-11-21 20:57:29,217 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:57:29" (1/1) ... [2023-11-21 20:57:29,277 INFO L138 Inliner]: procedures = 25, calls = 56, calls flagged for inlining = 22, calls inlined = 30, statements flattened = 411 [2023-11-21 20:57:29,278 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 20:57:29,279 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 20:57:29,279 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 20:57:29,280 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 20:57:29,290 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:57:29" (1/1) ... [2023-11-21 20:57:29,290 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:57:29" (1/1) ... [2023-11-21 20:57:29,311 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:57:29" (1/1) ... [2023-11-21 20:57:29,312 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:57:29" (1/1) ... [2023-11-21 20:57:29,337 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:57:29" (1/1) ... [2023-11-21 20:57:29,344 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:57:29" (1/1) ... [2023-11-21 20:57:29,348 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:57:29" (1/1) ... [2023-11-21 20:57:29,351 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:57:29" (1/1) ... [2023-11-21 20:57:29,370 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 20:57:29,371 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 20:57:29,371 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 20:57:29,371 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 20:57:29,372 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:57:29" (1/1) ... [2023-11-21 20:57:29,379 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 20:57:29,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 20:57:29,418 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 20:57:29,452 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 20:57:29,468 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 20:57:29,469 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-21 20:57:29,470 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-21 20:57:29,470 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-21 20:57:29,470 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2023-11-21 20:57:29,471 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2023-11-21 20:57:29,471 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2023-11-21 20:57:29,472 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2023-11-21 20:57:29,472 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-21 20:57:29,472 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-21 20:57:29,472 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 20:57:29,473 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 20:57:29,473 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-21 20:57:29,475 WARN L212 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-11-21 20:57:29,657 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 20:57:29,664 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 20:57:30,589 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 20:57:31,293 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 20:57:31,294 INFO L308 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-21 20:57:31,296 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 08:57:31 BoogieIcfgContainer [2023-11-21 20:57:31,296 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 20:57:31,299 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 20:57:31,299 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 20:57:31,303 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 20:57:31,303 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 08:57:28" (1/3) ... [2023-11-21 20:57:31,304 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2decd65a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 08:57:31, skipping insertion in model container [2023-11-21 20:57:31,304 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:57:29" (2/3) ... [2023-11-21 20:57:31,306 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2decd65a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 08:57:31, skipping insertion in model container [2023-11-21 20:57:31,306 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 08:57:31" (3/3) ... [2023-11-21 20:57:31,307 INFO L112 eAbstractionObserver]: Analyzing ICFG chl-nzb-file-symm.wvr.c [2023-11-21 20:57:31,327 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 20:57:31,328 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 46 error locations. [2023-11-21 20:57:31,328 INFO L514 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-11-21 20:57:31,454 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-11-21 20:57:31,499 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 126 places, 139 transitions, 292 flow [2023-11-21 20:57:31,557 INFO L124 PetriNetUnfolderBase]: 20/137 cut-off events. [2023-11-21 20:57:31,557 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-11-21 20:57:31,564 INFO L83 FinitePrefix]: Finished finitePrefix Result has 146 conditions, 137 events. 20/137 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 450 event pairs, 0 based on Foata normal form. 0/71 useless extension candidates. Maximal degree in co-relation 113. Up to 2 conditions per place. [2023-11-21 20:57:31,564 INFO L82 GeneralOperation]: Start removeDead. Operand has 126 places, 139 transitions, 292 flow [2023-11-21 20:57:31,572 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 123 places, 136 transitions, 284 flow [2023-11-21 20:57:31,584 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 20:57:31,592 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;@2b89f7c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 20:57:31,592 INFO L358 AbstractCegarLoop]: Starting to check reachability of 80 error locations. [2023-11-21 20:57:31,596 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-11-21 20:57:31,597 INFO L124 PetriNetUnfolderBase]: 1/4 cut-off events. [2023-11-21 20:57:31,597 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-21 20:57:31,597 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-21 20:57:31,598 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1] [2023-11-21 20:57:31,598 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-21 20:57:31,627 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:57:31,627 INFO L85 PathProgramCache]: Analyzing trace with hash 1303401, now seen corresponding path program 1 times [2023-11-21 20:57:31,637 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:57:31,638 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1824024417] [2023-11-21 20:57:31,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:57:31,638 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:57:31,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:57:31,984 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:57:31,985 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:57:31,985 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1824024417] [2023-11-21 20:57:31,986 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1824024417] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:57:31,986 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 20:57:31,986 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-21 20:57:31,988 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698462972] [2023-11-21 20:57:31,989 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:57:31,997 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 20:57:32,003 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:57:32,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 20:57:32,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 20:57:32,111 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 77 out of 139 [2023-11-21 20:57:32,115 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 123 places, 136 transitions, 284 flow. Second operand has 3 states, 3 states have (on average 78.0) internal successors, (234), 3 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:32,115 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-21 20:57:32,116 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 77 of 139 [2023-11-21 20:57:32,117 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-21 20:57:32,927 INFO L124 PetriNetUnfolderBase]: 1323/3208 cut-off events. [2023-11-21 20:57:32,927 INFO L125 PetriNetUnfolderBase]: For 58/58 co-relation queries the response was YES. [2023-11-21 20:57:32,939 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5159 conditions, 3208 events. 1323/3208 cut-off events. For 58/58 co-relation queries the response was YES. Maximal size of possible extension queue 119. Compared 23482 event pairs, 701 based on Foata normal form. 60/2473 useless extension candidates. Maximal degree in co-relation 5009. Up to 1897 conditions per place. [2023-11-21 20:57:32,966 INFO L140 encePairwiseOnDemand]: 132/139 looper letters, 54 selfloop transitions, 2 changer transitions 0/130 dead transitions. [2023-11-21 20:57:32,966 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 121 places, 130 transitions, 384 flow [2023-11-21 20:57:32,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 20:57:32,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-21 20:57:32,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 292 transitions. [2023-11-21 20:57:32,982 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.7002398081534772 [2023-11-21 20:57:32,983 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 292 transitions. [2023-11-21 20:57:32,984 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 292 transitions. [2023-11-21 20:57:32,985 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-21 20:57:32,988 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 292 transitions. [2023-11-21 20:57:32,991 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 97.33333333333333) internal successors, (292), 3 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:32,997 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 139.0) internal successors, (556), 4 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:32,998 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 139.0) internal successors, (556), 4 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:33,000 INFO L175 Difference]: Start difference. First operand has 123 places, 136 transitions, 284 flow. Second operand 3 states and 292 transitions. [2023-11-21 20:57:33,001 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 121 places, 130 transitions, 384 flow [2023-11-21 20:57:33,006 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 117 places, 130 transitions, 376 flow, removed 0 selfloop flow, removed 4 redundant places. [2023-11-21 20:57:33,010 INFO L231 Difference]: Finished difference. Result has 117 places, 130 transitions, 268 flow [2023-11-21 20:57:33,013 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=264, PETRI_DIFFERENCE_MINUEND_PLACES=115, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=130, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=128, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=268, PETRI_PLACES=117, PETRI_TRANSITIONS=130} [2023-11-21 20:57:33,017 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, -6 predicate places. [2023-11-21 20:57:33,017 INFO L495 AbstractCegarLoop]: Abstraction has has 117 places, 130 transitions, 268 flow [2023-11-21 20:57:33,018 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 78.0) internal successors, (234), 3 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:33,018 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-21 20:57:33,018 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1] [2023-11-21 20:57:33,018 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-21 20:57:33,019 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-21 20:57:33,019 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:57:33,020 INFO L85 PathProgramCache]: Analyzing trace with hash 1303402, now seen corresponding path program 1 times [2023-11-21 20:57:33,020 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:57:33,020 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [366081362] [2023-11-21 20:57:33,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:57:33,021 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:57:33,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:57:33,340 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:57:33,340 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:57:33,340 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [366081362] [2023-11-21 20:57:33,341 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [366081362] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:57:33,341 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 20:57:33,341 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 20:57:33,341 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396261615] [2023-11-21 20:57:33,342 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:57:33,343 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 20:57:33,343 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:57:33,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 20:57:33,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:57:33,461 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 77 out of 139 [2023-11-21 20:57:33,461 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 117 places, 130 transitions, 268 flow. Second operand has 4 states, 4 states have (on average 77.75) internal successors, (311), 4 states have internal predecessors, (311), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:33,462 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-21 20:57:33,462 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 77 of 139 [2023-11-21 20:57:33,462 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-21 20:57:34,079 INFO L124 PetriNetUnfolderBase]: 1323/3212 cut-off events. [2023-11-21 20:57:34,079 INFO L125 PetriNetUnfolderBase]: For 14/14 co-relation queries the response was YES. [2023-11-21 20:57:34,086 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5140 conditions, 3212 events. 1323/3212 cut-off events. For 14/14 co-relation queries the response was YES. Maximal size of possible extension queue 119. Compared 23486 event pairs, 701 based on Foata normal form. 1/2417 useless extension candidates. Maximal degree in co-relation 5109. Up to 1905 conditions per place. [2023-11-21 20:57:34,107 INFO L140 encePairwiseOnDemand]: 132/139 looper letters, 58 selfloop transitions, 4 changer transitions 0/134 dead transitions. [2023-11-21 20:57:34,108 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 119 places, 134 transitions, 400 flow [2023-11-21 20:57:34,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 20:57:34,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-21 20:57:34,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 297 transitions. [2023-11-21 20:57:34,111 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.7122302158273381 [2023-11-21 20:57:34,111 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 297 transitions. [2023-11-21 20:57:34,111 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 297 transitions. [2023-11-21 20:57:34,111 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-21 20:57:34,112 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 297 transitions. [2023-11-21 20:57:34,113 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 99.0) internal successors, (297), 3 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:34,115 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 139.0) internal successors, (556), 4 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:34,116 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 139.0) internal successors, (556), 4 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:34,116 INFO L175 Difference]: Start difference. First operand has 117 places, 130 transitions, 268 flow. Second operand 3 states and 297 transitions. [2023-11-21 20:57:34,116 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 119 places, 134 transitions, 400 flow [2023-11-21 20:57:34,118 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 117 places, 134 transitions, 396 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-11-21 20:57:34,121 INFO L231 Difference]: Finished difference. Result has 118 places, 132 transitions, 290 flow [2023-11-21 20:57:34,121 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=264, PETRI_DIFFERENCE_MINUEND_PLACES=115, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=130, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=126, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=290, PETRI_PLACES=118, PETRI_TRANSITIONS=132} [2023-11-21 20:57:34,122 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, -5 predicate places. [2023-11-21 20:57:34,123 INFO L495 AbstractCegarLoop]: Abstraction has has 118 places, 132 transitions, 290 flow [2023-11-21 20:57:34,123 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 77.75) internal successors, (311), 4 states have internal predecessors, (311), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:34,123 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-21 20:57:34,123 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1] [2023-11-21 20:57:34,124 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-21 20:57:34,124 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-21 20:57:34,124 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:57:34,125 INFO L85 PathProgramCache]: Analyzing trace with hash 1252610931, now seen corresponding path program 1 times [2023-11-21 20:57:34,125 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:57:34,125 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [731160627] [2023-11-21 20:57:34,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:57:34,126 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:57:34,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:57:34,404 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:57:34,405 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:57:34,406 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [731160627] [2023-11-21 20:57:34,406 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [731160627] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 20:57:34,412 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [804252635] [2023-11-21 20:57:34,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:57:34,413 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:57:34,414 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 20:57:34,420 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 20:57:34,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-21 20:57:34,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:57:34,544 INFO L262 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-21 20:57:34,550 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 20:57:34,627 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-21 20:57:34,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:57:34,648 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-21 20:57:34,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:57:34,661 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-21 20:57:34,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:57:34,668 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2023-11-21 20:57:34,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:57:34,685 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 1 [2023-11-21 20:57:34,695 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:57:34,696 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-21 20:57:34,751 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:57:34,751 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 20:57:34,829 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:57:34,830 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [804252635] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 20:57:34,830 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 20:57:34,830 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 2, 2] total 7 [2023-11-21 20:57:34,831 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703677947] [2023-11-21 20:57:34,831 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 20:57:34,831 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-21 20:57:34,832 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:57:34,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-21 20:57:34,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2023-11-21 20:57:35,395 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 77 out of 139 [2023-11-21 20:57:35,397 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 118 places, 132 transitions, 290 flow. Second operand has 9 states, 9 states have (on average 78.66666666666667) internal successors, (708), 9 states have internal predecessors, (708), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:35,397 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-21 20:57:35,397 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 77 of 139 [2023-11-21 20:57:35,397 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-21 20:57:36,173 INFO L124 PetriNetUnfolderBase]: 1327/3228 cut-off events. [2023-11-21 20:57:36,173 INFO L125 PetriNetUnfolderBase]: For 14/14 co-relation queries the response was YES. [2023-11-21 20:57:36,180 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5192 conditions, 3228 events. 1327/3228 cut-off events. For 14/14 co-relation queries the response was YES. Maximal size of possible extension queue 119. Compared 23543 event pairs, 701 based on Foata normal form. 2/2435 useless extension candidates. Maximal degree in co-relation 5141. Up to 1907 conditions per place. [2023-11-21 20:57:36,202 INFO L140 encePairwiseOnDemand]: 132/139 looper letters, 64 selfloop transitions, 14 changer transitions 0/150 dead transitions. [2023-11-21 20:57:36,203 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 123 places, 150 transitions, 504 flow [2023-11-21 20:57:36,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 20:57:36,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-11-21 20:57:36,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 548 transitions. [2023-11-21 20:57:36,206 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.657074340527578 [2023-11-21 20:57:36,207 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 548 transitions. [2023-11-21 20:57:36,207 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 548 transitions. [2023-11-21 20:57:36,207 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-21 20:57:36,208 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 548 transitions. [2023-11-21 20:57:36,210 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 91.33333333333333) internal successors, (548), 6 states have internal predecessors, (548), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:36,213 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 139.0) internal successors, (973), 7 states have internal predecessors, (973), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:36,214 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 139.0) internal successors, (973), 7 states have internal predecessors, (973), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:36,215 INFO L175 Difference]: Start difference. First operand has 118 places, 132 transitions, 290 flow. Second operand 6 states and 548 transitions. [2023-11-21 20:57:36,215 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 123 places, 150 transitions, 504 flow [2023-11-21 20:57:36,218 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 122 places, 150 transitions, 498 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-11-21 20:57:36,221 INFO L231 Difference]: Finished difference. Result has 125 places, 142 transitions, 388 flow [2023-11-21 20:57:36,221 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=286, PETRI_DIFFERENCE_MINUEND_PLACES=117, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=132, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=7, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=125, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=388, PETRI_PLACES=125, PETRI_TRANSITIONS=142} [2023-11-21 20:57:36,223 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, 2 predicate places. [2023-11-21 20:57:36,223 INFO L495 AbstractCegarLoop]: Abstraction has has 125 places, 142 transitions, 388 flow [2023-11-21 20:57:36,224 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 78.66666666666667) internal successors, (708), 9 states have internal predecessors, (708), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:36,224 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-21 20:57:36,224 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 4, 1, 1] [2023-11-21 20:57:36,254 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-21 20:57:36,436 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:57:36,437 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-21 20:57:36,437 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:57:36,437 INFO L85 PathProgramCache]: Analyzing trace with hash 1163439630, now seen corresponding path program 2 times [2023-11-21 20:57:36,437 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:57:36,438 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1323956690] [2023-11-21 20:57:36,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:57:36,438 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:57:36,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:57:36,982 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:57:36,982 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:57:36,982 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1323956690] [2023-11-21 20:57:36,983 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1323956690] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 20:57:36,983 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [634819729] [2023-11-21 20:57:36,983 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-21 20:57:36,983 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:57:36,983 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 20:57:36,987 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 20:57:36,989 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-21 20:57:37,095 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-21 20:57:37,095 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 20:57:37,096 INFO L262 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-21 20:57:37,099 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 20:57:37,116 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 5 [2023-11-21 20:57:37,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:57:37,128 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-21 20:57:37,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:57:37,135 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2023-11-21 20:57:37,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:57:37,141 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-21 20:57:37,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:57:37,148 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2023-11-21 20:57:37,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:57:37,155 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-21 20:57:37,319 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:57:37,320 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 20:57:37,521 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:57:37,521 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [634819729] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 20:57:37,522 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 20:57:37,522 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 16 [2023-11-21 20:57:37,522 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086414375] [2023-11-21 20:57:37,523 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 20:57:37,523 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-21 20:57:37,524 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:57:37,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-21 20:57:37,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2023-11-21 20:57:39,678 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 77 out of 139 [2023-11-21 20:57:39,681 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 125 places, 142 transitions, 388 flow. Second operand has 18 states, 18 states have (on average 78.83333333333333) internal successors, (1419), 18 states have internal predecessors, (1419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:39,681 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-21 20:57:39,681 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 77 of 139 [2023-11-21 20:57:39,681 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-21 20:57:40,888 INFO L124 PetriNetUnfolderBase]: 1323/3228 cut-off events. [2023-11-21 20:57:40,889 INFO L125 PetriNetUnfolderBase]: For 62/62 co-relation queries the response was YES. [2023-11-21 20:57:40,897 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5218 conditions, 3228 events. 1323/3228 cut-off events. For 62/62 co-relation queries the response was YES. Maximal size of possible extension queue 119. Compared 23494 event pairs, 701 based on Foata normal form. 8/2443 useless extension candidates. Maximal degree in co-relation 5139. Up to 1905 conditions per place. [2023-11-21 20:57:40,924 INFO L140 encePairwiseOnDemand]: 132/139 looper letters, 66 selfloop transitions, 12 changer transitions 0/150 dead transitions. [2023-11-21 20:57:40,927 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 131 places, 150 transitions, 548 flow [2023-11-21 20:57:40,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-21 20:57:40,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-11-21 20:57:40,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 625 transitions. [2023-11-21 20:57:40,930 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6423432682425488 [2023-11-21 20:57:40,931 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 625 transitions. [2023-11-21 20:57:40,931 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 625 transitions. [2023-11-21 20:57:40,932 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-21 20:57:40,934 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 625 transitions. [2023-11-21 20:57:40,936 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 89.28571428571429) internal successors, (625), 7 states have internal predecessors, (625), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:40,939 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 139.0) internal successors, (1112), 8 states have internal predecessors, (1112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:40,940 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 139.0) internal successors, (1112), 8 states have internal predecessors, (1112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:40,940 INFO L175 Difference]: Start difference. First operand has 125 places, 142 transitions, 388 flow. Second operand 7 states and 625 transitions. [2023-11-21 20:57:40,940 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 131 places, 150 transitions, 548 flow [2023-11-21 20:57:40,945 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 130 places, 150 transitions, 532 flow, removed 6 selfloop flow, removed 1 redundant places. [2023-11-21 20:57:40,949 INFO L231 Difference]: Finished difference. Result has 131 places, 140 transitions, 394 flow [2023-11-21 20:57:40,949 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=344, PETRI_DIFFERENCE_MINUEND_PLACES=124, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=138, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=10, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=126, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=394, PETRI_PLACES=131, PETRI_TRANSITIONS=140} [2023-11-21 20:57:40,951 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, 8 predicate places. [2023-11-21 20:57:40,951 INFO L495 AbstractCegarLoop]: Abstraction has has 131 places, 140 transitions, 394 flow [2023-11-21 20:57:40,952 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 78.83333333333333) internal successors, (1419), 18 states have internal predecessors, (1419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:40,953 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-21 20:57:40,953 INFO L208 CegarLoopForPetriNet]: trace histogram [6, 5, 1, 1] [2023-11-21 20:57:40,979 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-21 20:57:41,172 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:57:41,172 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-21 20:57:41,173 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:57:41,173 INFO L85 PathProgramCache]: Analyzing trace with hash 1374029079, now seen corresponding path program 3 times [2023-11-21 20:57:41,173 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:57:41,173 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1231029494] [2023-11-21 20:57:41,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:57:41,174 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:57:41,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:57:41,317 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 21 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:57:41,317 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:57:41,317 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1231029494] [2023-11-21 20:57:41,318 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1231029494] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 20:57:41,318 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1952041575] [2023-11-21 20:57:41,318 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 20:57:41,318 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:57:41,319 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 20:57:41,320 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 20:57:41,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-21 20:57:41,420 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-21 20:57:41,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 20:57:41,421 INFO L262 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-21 20:57:41,423 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 20:57:41,446 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 5 [2023-11-21 20:57:41,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:57:41,461 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 1 [2023-11-21 20:57:41,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:57:41,468 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2023-11-21 20:57:41,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:57:41,475 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-21 20:57:41,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:57:41,486 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-21 20:57:41,490 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:57:41,491 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2023-11-21 20:57:41,609 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-21 20:57:41,610 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 20:57:41,729 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-21 20:57:41,729 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1952041575] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 20:57:41,729 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 20:57:41,729 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 3, 3] total 13 [2023-11-21 20:57:41,730 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022959371] [2023-11-21 20:57:41,730 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 20:57:41,730 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-21 20:57:41,731 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:57:41,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-21 20:57:41,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2023-11-21 20:57:42,417 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 77 out of 139 [2023-11-21 20:57:42,418 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 131 places, 140 transitions, 394 flow. Second operand has 14 states, 14 states have (on average 78.78571428571429) internal successors, (1103), 14 states have internal predecessors, (1103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:42,418 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-21 20:57:42,419 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 77 of 139 [2023-11-21 20:57:42,419 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-21 20:57:43,391 INFO L124 PetriNetUnfolderBase]: 1321/3222 cut-off events. [2023-11-21 20:57:43,391 INFO L125 PetriNetUnfolderBase]: For 44/44 co-relation queries the response was YES. [2023-11-21 20:57:43,403 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5203 conditions, 3222 events. 1321/3222 cut-off events. For 44/44 co-relation queries the response was YES. Maximal size of possible extension queue 120. Compared 23506 event pairs, 701 based on Foata normal form. 2/2431 useless extension candidates. Maximal degree in co-relation 5136. Up to 1897 conditions per place. [2023-11-21 20:57:43,425 INFO L140 encePairwiseOnDemand]: 132/139 looper letters, 53 selfloop transitions, 19 changer transitions 0/144 dead transitions. [2023-11-21 20:57:43,425 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 139 places, 144 transitions, 514 flow [2023-11-21 20:57:43,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-21 20:57:43,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2023-11-21 20:57:43,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 921 transitions. [2023-11-21 20:57:43,430 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6023544800523217 [2023-11-21 20:57:43,430 INFO L72 ComplementDD]: Start complementDD. Operand 11 states and 921 transitions. [2023-11-21 20:57:43,431 INFO L73 IsDeterministic]: Start isDeterministic. Operand 11 states and 921 transitions. [2023-11-21 20:57:43,432 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-21 20:57:43,432 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 11 states and 921 transitions. [2023-11-21 20:57:43,435 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 12 states, 11 states have (on average 83.72727272727273) internal successors, (921), 11 states have internal predecessors, (921), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:43,440 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 12 states, 12 states have (on average 139.0) internal successors, (1668), 12 states have internal predecessors, (1668), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:43,441 INFO L81 ComplementDD]: Finished complementDD. Result has 12 states, 12 states have (on average 139.0) internal successors, (1668), 12 states have internal predecessors, (1668), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:43,441 INFO L175 Difference]: Start difference. First operand has 131 places, 140 transitions, 394 flow. Second operand 11 states and 921 transitions. [2023-11-21 20:57:43,442 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 139 places, 144 transitions, 514 flow [2023-11-21 20:57:43,445 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 131 places, 144 transitions, 472 flow, removed 5 selfloop flow, removed 8 redundant places. [2023-11-21 20:57:43,448 INFO L231 Difference]: Finished difference. Result has 131 places, 144 transitions, 374 flow [2023-11-21 20:57:43,449 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=312, PETRI_DIFFERENCE_MINUEND_PLACES=121, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=136, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=15, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=121, PETRI_DIFFERENCE_SUBTRAHEND_STATES=11, PETRI_FLOW=374, PETRI_PLACES=131, PETRI_TRANSITIONS=144} [2023-11-21 20:57:43,450 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, 8 predicate places. [2023-11-21 20:57:43,450 INFO L495 AbstractCegarLoop]: Abstraction has has 131 places, 144 transitions, 374 flow [2023-11-21 20:57:43,451 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 78.78571428571429) internal successors, (1103), 14 states have internal predecessors, (1103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:43,451 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-21 20:57:43,451 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1] [2023-11-21 20:57:43,488 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-21 20:57:43,676 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:57:43,677 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-21 20:57:43,677 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:57:43,677 INFO L85 PathProgramCache]: Analyzing trace with hash -1779886498, now seen corresponding path program 1 times [2023-11-21 20:57:43,677 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:57:43,678 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1609402120] [2023-11-21 20:57:43,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:57:43,678 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:57:43,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:57:44,032 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-11-21 20:57:44,033 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:57:44,036 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1609402120] [2023-11-21 20:57:44,036 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1609402120] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:57:44,036 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 20:57:44,036 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 20:57:44,037 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [11636723] [2023-11-21 20:57:44,037 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:57:44,037 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-21 20:57:44,039 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:57:44,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-21 20:57:44,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2023-11-21 20:57:44,151 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 73 out of 139 [2023-11-21 20:57:44,151 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 131 places, 144 transitions, 374 flow. Second operand has 5 states, 5 states have (on average 75.0) internal successors, (375), 5 states have internal predecessors, (375), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:44,152 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-21 20:57:44,152 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 73 of 139 [2023-11-21 20:57:44,153 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-21 20:57:44,969 INFO L124 PetriNetUnfolderBase]: 2082/4848 cut-off events. [2023-11-21 20:57:44,970 INFO L125 PetriNetUnfolderBase]: For 15/15 co-relation queries the response was YES. [2023-11-21 20:57:44,982 INFO L83 FinitePrefix]: Finished finitePrefix Result has 7856 conditions, 4848 events. 2082/4848 cut-off events. For 15/15 co-relation queries the response was YES. Maximal size of possible extension queue 176. Compared 37447 event pairs, 1164 based on Foata normal form. 0/3697 useless extension candidates. Maximal degree in co-relation 7768. Up to 2924 conditions per place. [2023-11-21 20:57:45,008 INFO L140 encePairwiseOnDemand]: 135/139 looper letters, 72 selfloop transitions, 2 changer transitions 0/142 dead transitions. [2023-11-21 20:57:45,008 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 132 places, 142 transitions, 518 flow [2023-11-21 20:57:45,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 20:57:45,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-11-21 20:57:45,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 352 transitions. [2023-11-21 20:57:45,010 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6330935251798561 [2023-11-21 20:57:45,011 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 352 transitions. [2023-11-21 20:57:45,011 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 352 transitions. [2023-11-21 20:57:45,011 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-21 20:57:45,011 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 352 transitions. [2023-11-21 20:57:45,013 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 88.0) internal successors, (352), 4 states have internal predecessors, (352), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:45,014 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 139.0) internal successors, (695), 5 states have internal predecessors, (695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:45,014 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 139.0) internal successors, (695), 5 states have internal predecessors, (695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:45,015 INFO L175 Difference]: Start difference. First operand has 131 places, 144 transitions, 374 flow. Second operand 4 states and 352 transitions. [2023-11-21 20:57:45,015 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 132 places, 142 transitions, 518 flow [2023-11-21 20:57:45,017 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 123 places, 142 transitions, 480 flow, removed 2 selfloop flow, removed 9 redundant places. [2023-11-21 20:57:45,020 INFO L231 Difference]: Finished difference. Result has 123 places, 142 transitions, 336 flow [2023-11-21 20:57:45,020 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=332, PETRI_DIFFERENCE_MINUEND_PLACES=120, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=142, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=140, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=336, PETRI_PLACES=123, PETRI_TRANSITIONS=142} [2023-11-21 20:57:45,023 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, 0 predicate places. [2023-11-21 20:57:45,024 INFO L495 AbstractCegarLoop]: Abstraction has has 123 places, 142 transitions, 336 flow [2023-11-21 20:57:45,024 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 75.0) internal successors, (375), 5 states have internal predecessors, (375), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:45,024 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-21 20:57:45,024 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1] [2023-11-21 20:57:45,024 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-21 20:57:45,025 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-21 20:57:45,025 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:57:45,025 INFO L85 PathProgramCache]: Analyzing trace with hash -1779886497, now seen corresponding path program 1 times [2023-11-21 20:57:45,025 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:57:45,026 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [552397386] [2023-11-21 20:57:45,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:57:45,026 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:57:45,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:57:45,428 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-11-21 20:57:45,428 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:57:45,428 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [552397386] [2023-11-21 20:57:45,429 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [552397386] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:57:45,429 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 20:57:45,429 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 20:57:45,429 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827397382] [2023-11-21 20:57:45,430 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:57:45,430 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 20:57:45,430 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:57:45,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 20:57:45,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:57:45,542 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 77 out of 139 [2023-11-21 20:57:45,543 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 123 places, 142 transitions, 336 flow. Second operand has 4 states, 4 states have (on average 79.0) internal successors, (316), 4 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:45,543 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-21 20:57:45,543 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 77 of 139 [2023-11-21 20:57:45,543 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-21 20:57:46,114 INFO L124 PetriNetUnfolderBase]: 1321/3206 cut-off events. [2023-11-21 20:57:46,114 INFO L125 PetriNetUnfolderBase]: For 14/14 co-relation queries the response was YES. [2023-11-21 20:57:46,162 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5166 conditions, 3206 events. 1321/3206 cut-off events. For 14/14 co-relation queries the response was YES. Maximal size of possible extension queue 120. Compared 23238 event pairs, 701 based on Foata normal form. 266/2695 useless extension candidates. Maximal degree in co-relation 5093. Up to 1896 conditions per place. [2023-11-21 20:57:46,179 INFO L140 encePairwiseOnDemand]: 135/139 looper letters, 70 selfloop transitions, 2 changer transitions 0/140 dead transitions. [2023-11-21 20:57:46,180 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 124 places, 140 transitions, 476 flow [2023-11-21 20:57:46,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 20:57:46,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-11-21 20:57:46,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 366 transitions. [2023-11-21 20:57:46,183 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.658273381294964 [2023-11-21 20:57:46,183 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 366 transitions. [2023-11-21 20:57:46,184 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 366 transitions. [2023-11-21 20:57:46,184 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-21 20:57:46,184 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 366 transitions. [2023-11-21 20:57:46,186 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 91.5) internal successors, (366), 4 states have internal predecessors, (366), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:46,189 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 139.0) internal successors, (695), 5 states have internal predecessors, (695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:46,190 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 139.0) internal successors, (695), 5 states have internal predecessors, (695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:46,190 INFO L175 Difference]: Start difference. First operand has 123 places, 142 transitions, 336 flow. Second operand 4 states and 366 transitions. [2023-11-21 20:57:46,191 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 124 places, 140 transitions, 476 flow [2023-11-21 20:57:46,193 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 122 places, 140 transitions, 473 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-11-21 20:57:46,197 INFO L231 Difference]: Finished difference. Result has 122 places, 140 transitions, 333 flow [2023-11-21 20:57:46,198 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=329, PETRI_DIFFERENCE_MINUEND_PLACES=119, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=140, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=138, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=333, PETRI_PLACES=122, PETRI_TRANSITIONS=140} [2023-11-21 20:57:46,198 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, -1 predicate places. [2023-11-21 20:57:46,199 INFO L495 AbstractCegarLoop]: Abstraction has has 122 places, 140 transitions, 333 flow [2023-11-21 20:57:46,199 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 79.0) internal successors, (316), 4 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:46,199 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-21 20:57:46,200 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:57:46,200 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-21 20:57:46,200 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-21 20:57:46,202 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:57:46,202 INFO L85 PathProgramCache]: Analyzing trace with hash 1069008651, now seen corresponding path program 1 times [2023-11-21 20:57:46,202 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:57:46,202 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1222600294] [2023-11-21 20:57:46,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:57:46,203 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:57:46,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:57:46,526 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-11-21 20:57:46,526 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:57:46,527 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1222600294] [2023-11-21 20:57:46,527 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1222600294] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:57:46,527 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 20:57:46,527 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 20:57:46,528 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944011456] [2023-11-21 20:57:46,528 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:57:46,528 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-21 20:57:46,529 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:57:46,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-21 20:57:46,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2023-11-21 20:57:46,657 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 73 out of 139 [2023-11-21 20:57:46,658 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 122 places, 140 transitions, 333 flow. Second operand has 5 states, 5 states have (on average 75.4) internal successors, (377), 5 states have internal predecessors, (377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:46,658 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-21 20:57:46,658 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 73 of 139 [2023-11-21 20:57:46,658 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-21 20:57:47,222 INFO L124 PetriNetUnfolderBase]: 1363/3327 cut-off events. [2023-11-21 20:57:47,222 INFO L125 PetriNetUnfolderBase]: For 14/14 co-relation queries the response was YES. [2023-11-21 20:57:47,231 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5358 conditions, 3327 events. 1363/3327 cut-off events. For 14/14 co-relation queries the response was YES. Maximal size of possible extension queue 122. Compared 24379 event pairs, 727 based on Foata normal form. 0/2522 useless extension candidates. Maximal degree in co-relation 5284. Up to 1966 conditions per place. [2023-11-21 20:57:47,247 INFO L140 encePairwiseOnDemand]: 135/139 looper letters, 72 selfloop transitions, 2 changer transitions 0/138 dead transitions. [2023-11-21 20:57:47,248 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 123 places, 138 transitions, 477 flow [2023-11-21 20:57:47,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 20:57:47,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-11-21 20:57:47,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 352 transitions. [2023-11-21 20:57:47,250 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6330935251798561 [2023-11-21 20:57:47,251 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 352 transitions. [2023-11-21 20:57:47,251 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 352 transitions. [2023-11-21 20:57:47,251 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-21 20:57:47,251 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 352 transitions. [2023-11-21 20:57:47,253 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 88.0) internal successors, (352), 4 states have internal predecessors, (352), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:47,255 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 139.0) internal successors, (695), 5 states have internal predecessors, (695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:47,256 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 139.0) internal successors, (695), 5 states have internal predecessors, (695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:47,256 INFO L175 Difference]: Start difference. First operand has 122 places, 140 transitions, 333 flow. Second operand 4 states and 352 transitions. [2023-11-21 20:57:47,256 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 123 places, 138 transitions, 477 flow [2023-11-21 20:57:47,258 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 121 places, 138 transitions, 474 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-11-21 20:57:47,261 INFO L231 Difference]: Finished difference. Result has 121 places, 138 transitions, 330 flow [2023-11-21 20:57:47,262 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=326, PETRI_DIFFERENCE_MINUEND_PLACES=118, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=138, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=136, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=330, PETRI_PLACES=121, PETRI_TRANSITIONS=138} [2023-11-21 20:57:47,266 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, -2 predicate places. [2023-11-21 20:57:47,267 INFO L495 AbstractCegarLoop]: Abstraction has has 121 places, 138 transitions, 330 flow [2023-11-21 20:57:47,267 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 75.4) internal successors, (377), 5 states have internal predecessors, (377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:47,267 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-21 20:57:47,267 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:57:47,268 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-21 20:57:47,268 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-21 20:57:47,268 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:57:47,268 INFO L85 PathProgramCache]: Analyzing trace with hash 1069008652, now seen corresponding path program 1 times [2023-11-21 20:57:47,269 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:57:47,269 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2123530009] [2023-11-21 20:57:47,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:57:47,269 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:57:47,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:57:47,713 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-21 20:57:47,714 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:57:47,714 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2123530009] [2023-11-21 20:57:47,714 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2123530009] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 20:57:47,714 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1720213311] [2023-11-21 20:57:47,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:57:47,714 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:57:47,715 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 20:57:47,716 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 20:57:47,742 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-21 20:57:47,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:57:47,859 INFO L262 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-21 20:57:47,862 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 20:57:47,888 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 1 [2023-11-21 20:57:47,893 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:57:47,894 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:57:47,897 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-21 20:57:47,988 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:57:47,989 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-21 20:57:48,054 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-11-21 20:57:48,054 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 20:57:48,054 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1720213311] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:57:48,055 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-21 20:57:48,055 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2023-11-21 20:57:48,055 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796847990] [2023-11-21 20:57:48,055 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:57:48,056 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 20:57:48,056 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:57:48,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 20:57:48,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2023-11-21 20:57:48,137 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 77 out of 139 [2023-11-21 20:57:48,138 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 121 places, 138 transitions, 330 flow. Second operand has 4 states, 4 states have (on average 79.5) internal successors, (318), 4 states have internal predecessors, (318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:48,138 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-21 20:57:48,138 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 77 of 139 [2023-11-21 20:57:48,138 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-21 20:57:48,629 INFO L124 PetriNetUnfolderBase]: 1321/3202 cut-off events. [2023-11-21 20:57:48,629 INFO L125 PetriNetUnfolderBase]: For 14/14 co-relation queries the response was YES. [2023-11-21 20:57:48,639 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5164 conditions, 3202 events. 1321/3202 cut-off events. For 14/14 co-relation queries the response was YES. Maximal size of possible extension queue 119. Compared 23222 event pairs, 701 based on Foata normal form. 27/2456 useless extension candidates. Maximal degree in co-relation 5089. Up to 1918 conditions per place. [2023-11-21 20:57:48,658 INFO L140 encePairwiseOnDemand]: 136/139 looper letters, 71 selfloop transitions, 1 changer transitions 0/136 dead transitions. [2023-11-21 20:57:48,658 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 121 places, 136 transitions, 470 flow [2023-11-21 20:57:48,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 20:57:48,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-21 20:57:48,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 289 transitions. [2023-11-21 20:57:48,661 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6930455635491607 [2023-11-21 20:57:48,661 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 289 transitions. [2023-11-21 20:57:48,661 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 289 transitions. [2023-11-21 20:57:48,662 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-21 20:57:48,662 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 289 transitions. [2023-11-21 20:57:48,663 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 96.33333333333333) internal successors, (289), 3 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:48,665 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 139.0) internal successors, (556), 4 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:48,665 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 139.0) internal successors, (556), 4 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:48,666 INFO L175 Difference]: Start difference. First operand has 121 places, 138 transitions, 330 flow. Second operand 3 states and 289 transitions. [2023-11-21 20:57:48,666 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 121 places, 136 transitions, 470 flow [2023-11-21 20:57:48,668 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 119 places, 136 transitions, 467 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-11-21 20:57:48,671 INFO L231 Difference]: Finished difference. Result has 119 places, 136 transitions, 325 flow [2023-11-21 20:57:48,671 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=323, PETRI_DIFFERENCE_MINUEND_PLACES=117, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=136, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=135, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=325, PETRI_PLACES=119, PETRI_TRANSITIONS=136} [2023-11-21 20:57:48,672 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, -4 predicate places. [2023-11-21 20:57:48,672 INFO L495 AbstractCegarLoop]: Abstraction has has 119 places, 136 transitions, 325 flow [2023-11-21 20:57:48,673 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 79.5) internal successors, (318), 4 states have internal predecessors, (318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:48,673 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-21 20:57:48,673 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:57:48,703 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-21 20:57:48,896 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:57:48,896 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-21 20:57:48,897 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:57:48,897 INFO L85 PathProgramCache]: Analyzing trace with hash -332046149, now seen corresponding path program 1 times [2023-11-21 20:57:48,897 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:57:48,897 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [994684670] [2023-11-21 20:57:48,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:57:48,898 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:57:48,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:57:49,400 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-11-21 20:57:49,400 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:57:49,400 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [994684670] [2023-11-21 20:57:49,400 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [994684670] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 20:57:49,401 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1437283923] [2023-11-21 20:57:49,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:57:49,401 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:57:49,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 20:57:49,402 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 20:57:49,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-21 20:57:49,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:57:49,558 INFO L262 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 46 conjunts are in the unsatisfiable core [2023-11-21 20:57:49,562 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 20:57:49,576 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-21 20:57:49,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:57:49,585 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-21 20:57:49,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:57:49,592 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2023-11-21 20:57:49,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:57:49,600 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-21 20:57:49,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:57:49,611 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 1 [2023-11-21 20:57:49,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:57:49,618 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-21 20:57:49,768 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-21 20:57:49,770 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 14 [2023-11-21 20:57:50,162 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 20:57:50,165 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 20:57:50,591 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-21 20:57:50,591 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1437283923] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-21 20:57:50,591 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-21 20:57:50,592 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [5, 12] total 25 [2023-11-21 20:57:50,592 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1697873027] [2023-11-21 20:57:50,592 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:57:50,592 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-21 20:57:50,593 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:57:50,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-21 20:57:50,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=535, Unknown=0, NotChecked=0, Total=702 [2023-11-21 20:57:51,399 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 75 out of 139 [2023-11-21 20:57:51,401 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 119 places, 136 transitions, 325 flow. Second operand has 10 states, 10 states have (on average 77.0) internal successors, (770), 10 states have internal predecessors, (770), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:51,401 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-21 20:57:51,401 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 75 of 139 [2023-11-21 20:57:51,401 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-21 20:57:52,397 INFO L124 PetriNetUnfolderBase]: 1821/3942 cut-off events. [2023-11-21 20:57:52,398 INFO L125 PetriNetUnfolderBase]: For 21/21 co-relation queries the response was YES. [2023-11-21 20:57:52,411 INFO L83 FinitePrefix]: Finished finitePrefix Result has 6702 conditions, 3942 events. 1821/3942 cut-off events. For 21/21 co-relation queries the response was YES. Maximal size of possible extension queue 128. Compared 27075 event pairs, 464 based on Foata normal form. 0/3214 useless extension candidates. Maximal degree in co-relation 6695. Up to 1903 conditions per place. [2023-11-21 20:57:52,433 INFO L140 encePairwiseOnDemand]: 129/139 looper letters, 99 selfloop transitions, 6 changer transitions 0/165 dead transitions. [2023-11-21 20:57:52,433 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 121 places, 165 transitions, 596 flow [2023-11-21 20:57:52,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 20:57:52,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-11-21 20:57:52,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 543 transitions. [2023-11-21 20:57:52,436 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6510791366906474 [2023-11-21 20:57:52,437 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 543 transitions. [2023-11-21 20:57:52,437 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 543 transitions. [2023-11-21 20:57:52,437 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-21 20:57:52,438 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 543 transitions. [2023-11-21 20:57:52,440 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 90.5) internal successors, (543), 6 states have internal predecessors, (543), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:52,442 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 139.0) internal successors, (973), 7 states have internal predecessors, (973), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:52,443 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 139.0) internal successors, (973), 7 states have internal predecessors, (973), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:52,443 INFO L175 Difference]: Start difference. First operand has 119 places, 136 transitions, 325 flow. Second operand 6 states and 543 transitions. [2023-11-21 20:57:52,444 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 121 places, 165 transitions, 596 flow [2023-11-21 20:57:52,446 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 120 places, 165 transitions, 595 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-11-21 20:57:52,449 INFO L231 Difference]: Finished difference. Result has 122 places, 134 transitions, 343 flow [2023-11-21 20:57:52,450 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=318, PETRI_DIFFERENCE_MINUEND_PLACES=115, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=133, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=127, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=343, PETRI_PLACES=122, PETRI_TRANSITIONS=134} [2023-11-21 20:57:52,450 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, -1 predicate places. [2023-11-21 20:57:52,451 INFO L495 AbstractCegarLoop]: Abstraction has has 122 places, 134 transitions, 343 flow [2023-11-21 20:57:52,451 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 77.0) internal successors, (770), 10 states have internal predecessors, (770), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:52,452 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-21 20:57:52,452 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:57:52,481 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-21 20:57:52,672 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:57:52,672 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-21 20:57:52,673 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:57:52,673 INFO L85 PathProgramCache]: Analyzing trace with hash -332046150, now seen corresponding path program 1 times [2023-11-21 20:57:52,673 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:57:52,673 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1157485425] [2023-11-21 20:57:52,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:57:52,673 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:57:52,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:57:52,884 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-11-21 20:57:52,885 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:57:52,885 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1157485425] [2023-11-21 20:57:52,885 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1157485425] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:57:52,886 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 20:57:52,886 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 20:57:52,886 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466759710] [2023-11-21 20:57:52,886 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:57:52,887 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-21 20:57:52,887 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:57:52,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-21 20:57:52,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-21 20:57:53,037 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 69 out of 139 [2023-11-21 20:57:53,038 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 122 places, 134 transitions, 343 flow. Second operand has 5 states, 5 states have (on average 71.8) internal successors, (359), 5 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:53,038 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-21 20:57:53,038 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 69 of 139 [2023-11-21 20:57:53,038 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-21 20:57:53,721 INFO L124 PetriNetUnfolderBase]: 1643/3737 cut-off events. [2023-11-21 20:57:53,722 INFO L125 PetriNetUnfolderBase]: For 329/339 co-relation queries the response was YES. [2023-11-21 20:57:53,737 INFO L83 FinitePrefix]: Finished finitePrefix Result has 6486 conditions, 3737 events. 1643/3737 cut-off events. For 329/339 co-relation queries the response was YES. Maximal size of possible extension queue 124. Compared 26361 event pairs, 933 based on Foata normal form. 62/3084 useless extension candidates. Maximal degree in co-relation 6476. Up to 2391 conditions per place. [2023-11-21 20:57:53,762 INFO L140 encePairwiseOnDemand]: 128/139 looper letters, 70 selfloop transitions, 3 changer transitions 0/126 dead transitions. [2023-11-21 20:57:53,762 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 118 places, 126 transitions, 473 flow [2023-11-21 20:57:53,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-21 20:57:53,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-11-21 20:57:53,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 409 transitions. [2023-11-21 20:57:53,765 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5884892086330935 [2023-11-21 20:57:53,765 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 409 transitions. [2023-11-21 20:57:53,765 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 409 transitions. [2023-11-21 20:57:53,766 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-21 20:57:53,766 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 409 transitions. [2023-11-21 20:57:53,768 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 81.8) internal successors, (409), 5 states have internal predecessors, (409), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:53,770 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 139.0) internal successors, (834), 6 states have internal predecessors, (834), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:53,770 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 139.0) internal successors, (834), 6 states have internal predecessors, (834), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:53,771 INFO L175 Difference]: Start difference. First operand has 122 places, 134 transitions, 343 flow. Second operand 5 states and 409 transitions. [2023-11-21 20:57:53,771 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 118 places, 126 transitions, 473 flow [2023-11-21 20:57:53,774 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 114 places, 126 transitions, 465 flow, removed 0 selfloop flow, removed 4 redundant places. [2023-11-21 20:57:53,777 INFO L231 Difference]: Finished difference. Result has 114 places, 126 transitions, 325 flow [2023-11-21 20:57:53,778 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=319, PETRI_DIFFERENCE_MINUEND_PLACES=110, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=126, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=123, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=325, PETRI_PLACES=114, PETRI_TRANSITIONS=126} [2023-11-21 20:57:53,779 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, -9 predicate places. [2023-11-21 20:57:53,779 INFO L495 AbstractCegarLoop]: Abstraction has has 114 places, 126 transitions, 325 flow [2023-11-21 20:57:53,779 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 71.8) internal successors, (359), 5 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:53,780 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-21 20:57:53,780 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:57:53,780 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-21 20:57:53,780 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-21 20:57:53,781 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:57:53,781 INFO L85 PathProgramCache]: Analyzing trace with hash -1268723938, now seen corresponding path program 1 times [2023-11-21 20:57:53,781 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:57:53,781 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1031578372] [2023-11-21 20:57:53,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:57:53,782 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:57:53,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:57:53,904 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-11-21 20:57:53,904 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:57:53,905 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1031578372] [2023-11-21 20:57:53,905 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1031578372] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:57:53,905 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 20:57:53,905 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 20:57:53,905 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678583851] [2023-11-21 20:57:53,906 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:57:53,906 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 20:57:53,906 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:57:53,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 20:57:53,907 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:57:53,992 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 69 out of 139 [2023-11-21 20:57:53,993 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 114 places, 126 transitions, 325 flow. Second operand has 4 states, 4 states have (on average 72.75) internal successors, (291), 4 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:53,993 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-21 20:57:53,993 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 69 of 139 [2023-11-21 20:57:53,993 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-21 20:57:54,558 INFO L124 PetriNetUnfolderBase]: 1643/3541 cut-off events. [2023-11-21 20:57:54,558 INFO L125 PetriNetUnfolderBase]: For 233/243 co-relation queries the response was YES. [2023-11-21 20:57:54,572 INFO L83 FinitePrefix]: Finished finitePrefix Result has 6229 conditions, 3541 events. 1643/3541 cut-off events. For 233/243 co-relation queries the response was YES. Maximal size of possible extension queue 110. Compared 23574 event pairs, 933 based on Foata normal form. 0/3022 useless extension candidates. Maximal degree in co-relation 6219. Up to 2391 conditions per place. [2023-11-21 20:57:54,590 INFO L140 encePairwiseOnDemand]: 129/139 looper letters, 71 selfloop transitions, 2 changer transitions 0/118 dead transitions. [2023-11-21 20:57:54,590 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 109 places, 118 transitions, 455 flow [2023-11-21 20:57:54,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 20:57:54,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-11-21 20:57:54,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 340 transitions. [2023-11-21 20:57:54,593 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6115107913669064 [2023-11-21 20:57:54,593 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 340 transitions. [2023-11-21 20:57:54,593 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 340 transitions. [2023-11-21 20:57:54,593 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-21 20:57:54,594 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 340 transitions. [2023-11-21 20:57:54,595 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 85.0) internal successors, (340), 4 states have internal predecessors, (340), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:54,597 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 139.0) internal successors, (695), 5 states have internal predecessors, (695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:54,597 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 139.0) internal successors, (695), 5 states have internal predecessors, (695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:54,598 INFO L175 Difference]: Start difference. First operand has 114 places, 126 transitions, 325 flow. Second operand 4 states and 340 transitions. [2023-11-21 20:57:54,598 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 109 places, 118 transitions, 455 flow [2023-11-21 20:57:54,600 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 106 places, 118 transitions, 450 flow, removed 0 selfloop flow, removed 3 redundant places. [2023-11-21 20:57:54,603 INFO L231 Difference]: Finished difference. Result has 106 places, 118 transitions, 308 flow [2023-11-21 20:57:54,603 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=304, PETRI_DIFFERENCE_MINUEND_PLACES=103, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=118, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=116, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=308, PETRI_PLACES=106, PETRI_TRANSITIONS=118} [2023-11-21 20:57:54,604 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, -17 predicate places. [2023-11-21 20:57:54,604 INFO L495 AbstractCegarLoop]: Abstraction has has 106 places, 118 transitions, 308 flow [2023-11-21 20:57:54,605 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 72.75) internal successors, (291), 4 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:54,605 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-21 20:57:54,605 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:57:54,605 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-11-21 20:57:54,605 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-21 20:57:54,606 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:57:54,606 INFO L85 PathProgramCache]: Analyzing trace with hash -1268723937, now seen corresponding path program 1 times [2023-11-21 20:57:54,606 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:57:54,606 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1123195377] [2023-11-21 20:57:54,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:57:54,607 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:57:54,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:57:54,945 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-21 20:57:54,945 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:57:54,945 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1123195377] [2023-11-21 20:57:54,946 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1123195377] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 20:57:54,946 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [398140898] [2023-11-21 20:57:54,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:57:54,946 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:57:54,946 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 20:57:54,949 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 20:57:54,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-21 20:57:55,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:57:55,128 INFO L262 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 18 conjunts are in the unsatisfiable core [2023-11-21 20:57:55,131 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 20:57:55,351 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-21 20:57:55,351 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 20:57:55,463 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2023-11-21 20:57:55,588 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-21 20:57:55,589 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [398140898] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 20:57:55,589 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 20:57:55,589 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 9, 9] total 20 [2023-11-21 20:57:55,589 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633301819] [2023-11-21 20:57:55,590 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 20:57:55,590 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-11-21 20:57:55,591 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:57:55,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-11-21 20:57:55,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=333, Unknown=0, NotChecked=0, Total=420 [2023-11-21 20:57:57,001 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 75 out of 139 [2023-11-21 20:57:57,003 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 106 places, 118 transitions, 308 flow. Second operand has 21 states, 21 states have (on average 77.33333333333333) internal successors, (1624), 21 states have internal predecessors, (1624), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:57,004 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-21 20:57:57,004 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 75 of 139 [2023-11-21 20:57:57,004 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-21 20:57:58,820 INFO L124 PetriNetUnfolderBase]: 4036/7732 cut-off events. [2023-11-21 20:57:58,820 INFO L125 PetriNetUnfolderBase]: For 371/396 co-relation queries the response was YES. [2023-11-21 20:57:58,848 INFO L83 FinitePrefix]: Finished finitePrefix Result has 14146 conditions, 7732 events. 4036/7732 cut-off events. For 371/396 co-relation queries the response was YES. Maximal size of possible extension queue 107. Compared 49056 event pairs, 1064 based on Foata normal form. 0/6512 useless extension candidates. Maximal degree in co-relation 14136. Up to 2079 conditions per place. [2023-11-21 20:57:58,886 INFO L140 encePairwiseOnDemand]: 124/139 looper letters, 148 selfloop transitions, 18 changer transitions 0/207 dead transitions. [2023-11-21 20:57:58,886 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 115 places, 207 transitions, 833 flow [2023-11-21 20:57:58,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-21 20:57:58,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2023-11-21 20:57:58,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 924 transitions. [2023-11-21 20:57:58,891 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6647482014388489 [2023-11-21 20:57:58,891 INFO L72 ComplementDD]: Start complementDD. Operand 10 states and 924 transitions. [2023-11-21 20:57:58,891 INFO L73 IsDeterministic]: Start isDeterministic. Operand 10 states and 924 transitions. [2023-11-21 20:57:58,892 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-21 20:57:58,892 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 10 states and 924 transitions. [2023-11-21 20:57:58,895 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 11 states, 10 states have (on average 92.4) internal successors, (924), 10 states have internal predecessors, (924), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:58,900 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 11 states, 11 states have (on average 139.0) internal successors, (1529), 11 states have internal predecessors, (1529), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:58,901 INFO L81 ComplementDD]: Finished complementDD. Result has 11 states, 11 states have (on average 139.0) internal successors, (1529), 11 states have internal predecessors, (1529), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:58,902 INFO L175 Difference]: Start difference. First operand has 106 places, 118 transitions, 308 flow. Second operand 10 states and 924 transitions. [2023-11-21 20:57:58,902 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 115 places, 207 transitions, 833 flow [2023-11-21 20:57:58,905 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 113 places, 207 transitions, 830 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-11-21 20:57:58,909 INFO L231 Difference]: Finished difference. Result has 116 places, 124 transitions, 400 flow [2023-11-21 20:57:58,910 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=305, PETRI_DIFFERENCE_MINUEND_PLACES=104, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=118, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=13, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=101, PETRI_DIFFERENCE_SUBTRAHEND_STATES=10, PETRI_FLOW=400, PETRI_PLACES=116, PETRI_TRANSITIONS=124} [2023-11-21 20:57:58,911 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, -7 predicate places. [2023-11-21 20:57:58,911 INFO L495 AbstractCegarLoop]: Abstraction has has 116 places, 124 transitions, 400 flow [2023-11-21 20:57:58,912 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 77.33333333333333) internal successors, (1624), 21 states have internal predecessors, (1624), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:57:58,913 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-21 20:57:58,913 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:57:58,940 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-21 20:57:59,128 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:57:59,128 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-21 20:57:59,129 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:57:59,129 INFO L85 PathProgramCache]: Analyzing trace with hash -1842974631, now seen corresponding path program 1 times [2023-11-21 20:57:59,129 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:57:59,129 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [645682754] [2023-11-21 20:57:59,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:57:59,129 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:57:59,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:57:59,501 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-21 20:57:59,501 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:57:59,501 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [645682754] [2023-11-21 20:57:59,502 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [645682754] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 20:57:59,502 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [587049854] [2023-11-21 20:57:59,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:57:59,502 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:57:59,502 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 20:57:59,504 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 20:57:59,528 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-21 20:57:59,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:57:59,695 INFO L262 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 18 conjunts are in the unsatisfiable core [2023-11-21 20:57:59,698 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 20:57:59,914 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-21 20:57:59,914 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 20:58:00,012 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2023-11-21 20:58:00,176 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-21 20:58:00,176 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [587049854] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 20:58:00,176 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 20:58:00,176 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 9, 9] total 20 [2023-11-21 20:58:00,177 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183416997] [2023-11-21 20:58:00,177 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 20:58:00,179 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-11-21 20:58:00,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:58:00,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-11-21 20:58:00,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=333, Unknown=0, NotChecked=0, Total=420 [2023-11-21 20:58:01,452 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 75 out of 139 [2023-11-21 20:58:01,457 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 116 places, 124 transitions, 400 flow. Second operand has 21 states, 21 states have (on average 77.47619047619048) internal successors, (1627), 21 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) [2023-11-21 20:58:01,457 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-21 20:58:01,457 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 75 of 139 [2023-11-21 20:58:01,458 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-21 20:58:04,160 INFO L124 PetriNetUnfolderBase]: 7683/15158 cut-off events. [2023-11-21 20:58:04,160 INFO L125 PetriNetUnfolderBase]: For 4087/4367 co-relation queries the response was YES. [2023-11-21 20:58:04,217 INFO L83 FinitePrefix]: Finished finitePrefix Result has 29257 conditions, 15158 events. 7683/15158 cut-off events. For 4087/4367 co-relation queries the response was YES. Maximal size of possible extension queue 230. Compared 110647 event pairs, 1239 based on Foata normal form. 0/13077 useless extension candidates. Maximal degree in co-relation 29244. Up to 4614 conditions per place. [2023-11-21 20:58:04,297 INFO L140 encePairwiseOnDemand]: 127/139 looper letters, 152 selfloop transitions, 15 changer transitions 0/208 dead transitions. [2023-11-21 20:58:04,297 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 122 places, 208 transitions, 1016 flow [2023-11-21 20:58:04,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-21 20:58:04,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2023-11-21 20:58:04,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 904 transitions. [2023-11-21 20:58:04,302 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6503597122302158 [2023-11-21 20:58:04,302 INFO L72 ComplementDD]: Start complementDD. Operand 10 states and 904 transitions. [2023-11-21 20:58:04,302 INFO L73 IsDeterministic]: Start isDeterministic. Operand 10 states and 904 transitions. [2023-11-21 20:58:04,303 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-21 20:58:04,304 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 10 states and 904 transitions. [2023-11-21 20:58:04,307 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 11 states, 10 states have (on average 90.4) internal successors, (904), 10 states have internal predecessors, (904), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:04,311 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 11 states, 11 states have (on average 139.0) internal successors, (1529), 11 states have internal predecessors, (1529), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:04,312 INFO L81 ComplementDD]: Finished complementDD. Result has 11 states, 11 states have (on average 139.0) internal successors, (1529), 11 states have internal predecessors, (1529), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:04,313 INFO L175 Difference]: Start difference. First operand has 116 places, 124 transitions, 400 flow. Second operand 10 states and 904 transitions. [2023-11-21 20:58:04,313 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 122 places, 208 transitions, 1016 flow [2023-11-21 20:58:04,322 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 116 places, 208 transitions, 995 flow, removed 0 selfloop flow, removed 6 redundant places. [2023-11-21 20:58:04,326 INFO L231 Difference]: Finished difference. Result has 119 places, 123 transitions, 422 flow [2023-11-21 20:58:04,327 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=373, PETRI_DIFFERENCE_MINUEND_PLACES=107, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=121, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=13, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=107, PETRI_DIFFERENCE_SUBTRAHEND_STATES=10, PETRI_FLOW=422, PETRI_PLACES=119, PETRI_TRANSITIONS=123} [2023-11-21 20:58:04,328 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, -4 predicate places. [2023-11-21 20:58:04,328 INFO L495 AbstractCegarLoop]: Abstraction has has 119 places, 123 transitions, 422 flow [2023-11-21 20:58:04,330 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 77.47619047619048) internal successors, (1627), 21 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) [2023-11-21 20:58:04,330 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-21 20:58:04,330 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:58:04,360 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-21 20:58:04,544 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:58:04,544 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting thread2Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-21 20:58:04,545 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:58:04,545 INFO L85 PathProgramCache]: Analyzing trace with hash -1572047459, now seen corresponding path program 1 times [2023-11-21 20:58:04,545 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:58:04,545 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [74309762] [2023-11-21 20:58:04,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:58:04,545 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:58:04,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:58:05,035 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-11-21 20:58:05,035 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:58:05,035 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [74309762] [2023-11-21 20:58:05,035 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [74309762] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 20:58:05,036 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [160085136] [2023-11-21 20:58:05,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:58:05,036 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:58:05,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 20:58:05,037 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 20:58:05,057 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-21 20:58:05,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:58:05,212 INFO L262 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 46 conjunts are in the unsatisfiable core [2023-11-21 20:58:05,216 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 20:58:05,226 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-21 20:58:05,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:58:05,235 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-21 20:58:05,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:58:05,245 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 1 [2023-11-21 20:58:05,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:58:05,251 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-21 20:58:05,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:58:05,257 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2023-11-21 20:58:05,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 20:58:05,264 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-21 20:58:05,416 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-21 20:58:05,416 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 14 [2023-11-21 20:58:05,836 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 20:58:05,837 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 20:58:06,351 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-21 20:58:06,351 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [160085136] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-21 20:58:06,351 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-21 20:58:06,352 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [5, 12] total 25 [2023-11-21 20:58:06,352 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1783938678] [2023-11-21 20:58:06,352 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:58:06,353 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-21 20:58:06,354 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:58:06,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-21 20:58:06,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=535, Unknown=0, NotChecked=0, Total=702 [2023-11-21 20:58:07,156 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 75 out of 139 [2023-11-21 20:58:07,158 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 119 places, 123 transitions, 422 flow. Second operand has 10 states, 10 states have (on average 77.3) internal successors, (773), 10 states have internal predecessors, (773), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:07,158 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-21 20:58:07,158 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 75 of 139 [2023-11-21 20:58:07,158 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-21 20:58:10,221 INFO L124 PetriNetUnfolderBase]: 10413/19323 cut-off events. [2023-11-21 20:58:10,221 INFO L125 PetriNetUnfolderBase]: For 6987/7387 co-relation queries the response was YES. [2023-11-21 20:58:10,318 INFO L83 FinitePrefix]: Finished finitePrefix Result has 39590 conditions, 19323 events. 10413/19323 cut-off events. For 6987/7387 co-relation queries the response was YES. Maximal size of possible extension queue 284. Compared 139959 event pairs, 3566 based on Foata normal form. 0/16399 useless extension candidates. Maximal degree in co-relation 39574. Up to 7795 conditions per place. [2023-11-21 20:58:10,430 INFO L140 encePairwiseOnDemand]: 126/139 looper letters, 125 selfloop transitions, 10 changer transitions 0/173 dead transitions. [2023-11-21 20:58:10,431 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 124 places, 173 transitions, 855 flow [2023-11-21 20:58:10,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 20:58:10,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-11-21 20:58:10,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 557 transitions. [2023-11-21 20:58:10,436 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6678657074340527 [2023-11-21 20:58:10,436 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 557 transitions. [2023-11-21 20:58:10,437 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 557 transitions. [2023-11-21 20:58:10,439 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-21 20:58:10,439 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 557 transitions. [2023-11-21 20:58:10,441 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 92.83333333333333) internal successors, (557), 6 states have internal predecessors, (557), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:10,448 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 139.0) internal successors, (973), 7 states have internal predecessors, (973), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:10,449 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 139.0) internal successors, (973), 7 states have internal predecessors, (973), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:10,449 INFO L175 Difference]: Start difference. First operand has 119 places, 123 transitions, 422 flow. Second operand 6 states and 557 transitions. [2023-11-21 20:58:10,449 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 124 places, 173 transitions, 855 flow [2023-11-21 20:58:10,470 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 118 places, 173 transitions, 834 flow, removed 0 selfloop flow, removed 6 redundant places. [2023-11-21 20:58:10,475 INFO L231 Difference]: Finished difference. Result has 120 places, 128 transitions, 468 flow [2023-11-21 20:58:10,476 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=401, PETRI_DIFFERENCE_MINUEND_PLACES=113, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=123, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=113, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=468, PETRI_PLACES=120, PETRI_TRANSITIONS=128} [2023-11-21 20:58:10,477 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, -3 predicate places. [2023-11-21 20:58:10,478 INFO L495 AbstractCegarLoop]: Abstraction has has 120 places, 128 transitions, 468 flow [2023-11-21 20:58:10,478 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 77.3) internal successors, (773), 10 states have internal predecessors, (773), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:10,479 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-21 20:58:10,479 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:58:10,502 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-21 20:58:10,692 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c614a105-dfd7-4ab0-b220-a0d5eaa70eee/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:58:10,692 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_LEAK === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-21 20:58:10,693 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:58:10,693 INFO L85 PathProgramCache]: Analyzing trace with hash 705696908, now seen corresponding path program 1 times [2023-11-21 20:58:10,693 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:58:10,693 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1381216483] [2023-11-21 20:58:10,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:58:10,694 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:58:10,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:58:12,248 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-11-21 20:58:12,248 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:58:12,249 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1381216483] [2023-11-21 20:58:12,249 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1381216483] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:58:12,249 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 20:58:12,249 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-21 20:58:12,249 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73196722] [2023-11-21 20:58:12,250 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:58:12,250 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 20:58:12,250 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:58:12,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 20:58:12,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 20:58:12,252 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 79 out of 139 [2023-11-21 20:58:12,252 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 120 places, 128 transitions, 468 flow. Second operand has 4 states, 4 states have (on average 84.0) internal successors, (336), 4 states have internal predecessors, (336), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:58:12,252 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-21 20:58:12,253 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 79 of 139 [2023-11-21 20:58:12,253 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand