./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/weaver/array-eq-symm.wvr.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version cf1a7837 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_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/config/AutomizerReach.xml -i ../../sv-benchmarks/c/weaver/array-eq-symm.wvr.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 6897befed0dbbae24492a1e82d50fcd0be6b3857b241d882a904d02a513d7a6d --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 02:31:31,866 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 02:31:31,933 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/config/svcomp-Reach-32bit-Automizer_Default.epf [2023-11-12 02:31:31,939 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 02:31:31,939 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 02:31:31,981 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 02:31:31,983 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 02:31:31,984 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 02:31:31,985 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 02:31:31,988 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 02:31:31,989 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-12 02:31:31,990 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-12 02:31:31,990 INFO L153 SettingsManager]: * Use SBE=true [2023-11-12 02:31:31,991 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 02:31:31,992 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-12 02:31:31,992 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 02:31:31,998 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 02:31:31,998 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 02:31:31,999 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 02:31:31,999 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-12 02:31:32,000 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 02:31:32,000 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-12 02:31:32,001 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 02:31:32,001 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-12 02:31:32,002 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 02:31:32,002 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 02:31:32,003 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-12 02:31:32,003 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 02:31:32,004 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 02:31:32,004 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 02:31:32,005 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 02:31:32,005 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-12 02:31:32,006 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-12 02:31:32,006 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 02:31:32,006 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-12 02:31:32,007 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-12 02:31:32,007 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-12 02:31:32,008 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 02:31:32,008 INFO L153 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-11-12 02:31:32,009 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_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6897befed0dbbae24492a1e82d50fcd0be6b3857b241d882a904d02a513d7a6d [2023-11-12 02:31:32,348 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 02:31:32,381 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 02:31:32,384 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 02:31:32,386 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 02:31:32,387 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 02:31:32,388 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/../../sv-benchmarks/c/weaver/array-eq-symm.wvr.c [2023-11-12 02:31:35,622 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 02:31:35,870 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 02:31:35,871 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/sv-benchmarks/c/weaver/array-eq-symm.wvr.c [2023-11-12 02:31:35,880 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/data/56b691c0b/e58ea1934c424d17b2df7bd399f66ed8/FLAG3ef2a13dc [2023-11-12 02:31:35,896 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/data/56b691c0b/e58ea1934c424d17b2df7bd399f66ed8 [2023-11-12 02:31:35,898 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 02:31:35,900 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 02:31:35,902 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 02:31:35,902 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 02:31:35,912 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 02:31:35,912 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 02:31:35" (1/1) ... [2023-11-12 02:31:35,914 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ef3999a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:31:35, skipping insertion in model container [2023-11-12 02:31:35,914 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 02:31:35" (1/1) ... [2023-11-12 02:31:35,946 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 02:31:36,119 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/sv-benchmarks/c/weaver/array-eq-symm.wvr.c[2277,2290] [2023-11-12 02:31:36,129 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 02:31:36,139 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 02:31:36,160 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/sv-benchmarks/c/weaver/array-eq-symm.wvr.c[2277,2290] [2023-11-12 02:31:36,164 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 02:31:36,181 INFO L206 MainTranslator]: Completed translation [2023-11-12 02:31:36,182 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:31:36 WrapperNode [2023-11-12 02:31:36,182 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 02:31:36,184 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 02:31:36,184 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 02:31:36,184 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 02:31:36,192 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:31:36" (1/1) ... [2023-11-12 02:31:36,201 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:31:36" (1/1) ... [2023-11-12 02:31:36,228 INFO L138 Inliner]: procedures = 23, calls = 29, calls flagged for inlining = 7, calls inlined = 9, statements flattened = 117 [2023-11-12 02:31:36,228 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 02:31:36,229 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 02:31:36,229 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 02:31:36,230 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 02:31:36,237 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:31:36" (1/1) ... [2023-11-12 02:31:36,238 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:31:36" (1/1) ... [2023-11-12 02:31:36,241 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:31:36" (1/1) ... [2023-11-12 02:31:36,241 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:31:36" (1/1) ... [2023-11-12 02:31:36,251 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:31:36" (1/1) ... [2023-11-12 02:31:36,256 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:31:36" (1/1) ... [2023-11-12 02:31:36,258 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:31:36" (1/1) ... [2023-11-12 02:31:36,260 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:31:36" (1/1) ... [2023-11-12 02:31:36,263 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 02:31:36,265 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 02:31:36,265 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 02:31:36,265 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 02:31:36,266 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:31:36" (1/1) ... [2023-11-12 02:31:36,286 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 02:31:36,300 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 [2023-11-12 02:31:36,312 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 02:31:36,318 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 02:31:36,346 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 02:31:36,346 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2023-11-12 02:31:36,347 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2023-11-12 02:31:36,347 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2023-11-12 02:31:36,347 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2023-11-12 02:31:36,347 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 02:31:36,348 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-12 02:31:36,348 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-12 02:31:36,348 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-12 02:31:36,348 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 02:31:36,348 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 02:31:36,349 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-12 02:31:36,349 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-12 02:31:36,351 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-11-12 02:31:36,454 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 02:31:36,456 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 02:31:36,805 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 02:31:36,817 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 02:31:36,817 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-12 02:31:36,820 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 02:31:36 BoogieIcfgContainer [2023-11-12 02:31:36,820 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 02:31:36,824 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 02:31:36,824 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 02:31:36,828 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 02:31:36,828 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 02:31:35" (1/3) ... [2023-11-12 02:31:36,829 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4dd36e46 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 02:31:36, skipping insertion in model container [2023-11-12 02:31:36,830 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 02:31:36" (2/3) ... [2023-11-12 02:31:36,830 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4dd36e46 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 02:31:36, skipping insertion in model container [2023-11-12 02:31:36,830 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 02:31:36" (3/3) ... [2023-11-12 02:31:36,832 INFO L112 eAbstractionObserver]: Analyzing ICFG array-eq-symm.wvr.c [2023-11-12 02:31:36,843 WARN L146 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2023-11-12 02:31:36,855 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 02:31:36,855 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-12 02:31:36,856 INFO L521 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-11-12 02:31:36,960 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-11-12 02:31:37,010 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 170 places, 178 transitions, 370 flow [2023-11-12 02:31:37,118 INFO L124 PetriNetUnfolderBase]: 15/176 cut-off events. [2023-11-12 02:31:37,118 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-11-12 02:31:37,125 INFO L83 FinitePrefix]: Finished finitePrefix Result has 185 conditions, 176 events. 15/176 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 131 event pairs, 0 based on Foata normal form. 0/160 useless extension candidates. Maximal degree in co-relation 134. Up to 3 conditions per place. [2023-11-12 02:31:37,125 INFO L82 GeneralOperation]: Start removeDead. Operand has 170 places, 178 transitions, 370 flow [2023-11-12 02:31:37,132 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 159 places, 167 transitions, 346 flow [2023-11-12 02:31:37,136 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-11-12 02:31:37,148 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 159 places, 167 transitions, 346 flow [2023-11-12 02:31:37,151 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 159 places, 167 transitions, 346 flow [2023-11-12 02:31:37,151 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 159 places, 167 transitions, 346 flow [2023-11-12 02:31:37,198 INFO L124 PetriNetUnfolderBase]: 15/167 cut-off events. [2023-11-12 02:31:37,198 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-11-12 02:31:37,199 INFO L83 FinitePrefix]: Finished finitePrefix Result has 176 conditions, 167 events. 15/167 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 131 event pairs, 0 based on Foata normal form. 0/152 useless extension candidates. Maximal degree in co-relation 134. Up to 3 conditions per place. [2023-11-12 02:31:37,202 INFO L119 LiptonReduction]: Number of co-enabled transitions 1088 [2023-11-12 02:31:43,952 INFO L134 LiptonReduction]: Checked pairs total: 1397 [2023-11-12 02:31:43,952 INFO L136 LiptonReduction]: Total number of compositions: 175 [2023-11-12 02:31:44,011 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 02:31:44,028 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=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, 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;@5bf22f5d, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-11-12 02:31:44,028 INFO L358 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2023-11-12 02:31:44,037 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-11-12 02:31:44,037 INFO L124 PetriNetUnfolderBase]: 5/20 cut-off events. [2023-11-12 02:31:44,037 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-11-12 02:31:44,038 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:31:44,038 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:31:44,039 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-12 02:31:44,060 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:31:44,061 INFO L85 PathProgramCache]: Analyzing trace with hash -179794851, now seen corresponding path program 1 times [2023-11-12 02:31:44,074 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:31:44,075 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [74632785] [2023-11-12 02:31:44,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:31:44,077 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:31:44,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:31:44,775 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:31:44,776 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:31:44,777 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [74632785] [2023-11-12 02:31:44,778 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [74632785] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:31:44,778 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:31:44,779 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 02:31:44,781 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401099139] [2023-11-12 02:31:44,782 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:31:44,793 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 02:31:44,801 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:31:44,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 02:31:44,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 02:31:44,900 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 162 out of 353 [2023-11-12 02:31:44,908 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 23 places, 21 transitions, 54 flow. Second operand has 3 states, 3 states have (on average 166.33333333333334) internal successors, (499), 3 states have internal predecessors, (499), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:44,908 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:31:44,908 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 162 of 353 [2023-11-12 02:31:44,909 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:31:45,025 INFO L124 PetriNetUnfolderBase]: 102/168 cut-off events. [2023-11-12 02:31:45,026 INFO L125 PetriNetUnfolderBase]: For 14/14 co-relation queries the response was YES. [2023-11-12 02:31:45,027 INFO L83 FinitePrefix]: Finished finitePrefix Result has 357 conditions, 168 events. 102/168 cut-off events. For 14/14 co-relation queries the response was YES. Maximal size of possible extension queue 20. Compared 487 event pairs, 15 based on Foata normal form. 1/109 useless extension candidates. Maximal degree in co-relation 282. Up to 116 conditions per place. [2023-11-12 02:31:45,030 INFO L140 encePairwiseOnDemand]: 349/353 looper letters, 27 selfloop transitions, 3 changer transitions 1/33 dead transitions. [2023-11-12 02:31:45,030 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 25 places, 33 transitions, 149 flow [2023-11-12 02:31:45,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 02:31:45,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-12 02:31:45,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 518 transitions. [2023-11-12 02:31:45,052 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.48914069877242683 [2023-11-12 02:31:45,053 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 518 transitions. [2023-11-12 02:31:45,054 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 518 transitions. [2023-11-12 02:31:45,057 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:31:45,060 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 518 transitions. [2023-11-12 02:31:45,066 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 172.66666666666666) internal successors, (518), 3 states have internal predecessors, (518), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:45,073 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 353.0) internal successors, (1412), 4 states have internal predecessors, (1412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:45,074 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 353.0) internal successors, (1412), 4 states have internal predecessors, (1412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:45,076 INFO L175 Difference]: Start difference. First operand has 23 places, 21 transitions, 54 flow. Second operand 3 states and 518 transitions. [2023-11-12 02:31:45,077 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 25 places, 33 transitions, 149 flow [2023-11-12 02:31:45,080 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 21 places, 33 transitions, 135 flow, removed 0 selfloop flow, removed 4 redundant places. [2023-11-12 02:31:45,082 INFO L231 Difference]: Finished difference. Result has 22 places, 23 transitions, 65 flow [2023-11-12 02:31:45,084 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=353, PETRI_DIFFERENCE_MINUEND_FLOW=46, PETRI_DIFFERENCE_MINUEND_PLACES=19, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=21, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=18, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=65, PETRI_PLACES=22, PETRI_TRANSITIONS=23} [2023-11-12 02:31:45,088 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, -1 predicate places. [2023-11-12 02:31:45,088 INFO L495 AbstractCegarLoop]: Abstraction has has 22 places, 23 transitions, 65 flow [2023-11-12 02:31:45,089 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 166.33333333333334) internal successors, (499), 3 states have internal predecessors, (499), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:45,089 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:31:45,089 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:31:45,090 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 02:31:45,090 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-12 02:31:45,091 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:31:45,091 INFO L85 PathProgramCache]: Analyzing trace with hash -295091682, now seen corresponding path program 1 times [2023-11-12 02:31:45,091 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:31:45,091 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1795390599] [2023-11-12 02:31:45,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:31:45,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:31:45,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:31:45,246 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:31:45,246 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:31:45,246 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1795390599] [2023-11-12 02:31:45,247 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1795390599] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:31:45,247 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:31:45,247 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 02:31:45,247 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846587686] [2023-11-12 02:31:45,248 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:31:45,249 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 02:31:45,249 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:31:45,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 02:31:45,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 02:31:45,377 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 148 out of 353 [2023-11-12 02:31:45,378 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 22 places, 23 transitions, 65 flow. Second operand has 4 states, 4 states have (on average 151.5) internal successors, (606), 4 states have internal predecessors, (606), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:45,378 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:31:45,378 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 148 of 353 [2023-11-12 02:31:45,379 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:31:45,544 INFO L124 PetriNetUnfolderBase]: 156/276 cut-off events. [2023-11-12 02:31:45,545 INFO L125 PetriNetUnfolderBase]: For 53/55 co-relation queries the response was YES. [2023-11-12 02:31:45,546 INFO L83 FinitePrefix]: Finished finitePrefix Result has 637 conditions, 276 events. 156/276 cut-off events. For 53/55 co-relation queries the response was YES. Maximal size of possible extension queue 28. Compared 1048 event pairs, 81 based on Foata normal form. 16/257 useless extension candidates. Maximal degree in co-relation 208. Up to 165 conditions per place. [2023-11-12 02:31:45,549 INFO L140 encePairwiseOnDemand]: 349/353 looper letters, 36 selfloop transitions, 3 changer transitions 0/41 dead transitions. [2023-11-12 02:31:45,549 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 25 places, 41 transitions, 190 flow [2023-11-12 02:31:45,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 02:31:45,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-11-12 02:31:45,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 629 transitions. [2023-11-12 02:31:45,554 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4454674220963173 [2023-11-12 02:31:45,554 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 629 transitions. [2023-11-12 02:31:45,555 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 629 transitions. [2023-11-12 02:31:45,555 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:31:45,556 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 629 transitions. [2023-11-12 02:31:45,558 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 157.25) internal successors, (629), 4 states have internal predecessors, (629), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:45,564 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 353.0) internal successors, (1765), 5 states have internal predecessors, (1765), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:45,566 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 353.0) internal successors, (1765), 5 states have internal predecessors, (1765), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:45,567 INFO L175 Difference]: Start difference. First operand has 22 places, 23 transitions, 65 flow. Second operand 4 states and 629 transitions. [2023-11-12 02:31:45,567 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 25 places, 41 transitions, 190 flow [2023-11-12 02:31:45,568 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 24 places, 41 transitions, 186 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-11-12 02:31:45,570 INFO L231 Difference]: Finished difference. Result has 26 places, 25 transitions, 84 flow [2023-11-12 02:31:45,570 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=353, PETRI_DIFFERENCE_MINUEND_FLOW=62, PETRI_DIFFERENCE_MINUEND_PLACES=21, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=23, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=20, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=84, PETRI_PLACES=26, PETRI_TRANSITIONS=25} [2023-11-12 02:31:45,571 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, 3 predicate places. [2023-11-12 02:31:45,572 INFO L495 AbstractCegarLoop]: Abstraction has has 26 places, 25 transitions, 84 flow [2023-11-12 02:31:45,573 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 151.5) internal successors, (606), 4 states have internal predecessors, (606), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:45,573 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:31:45,573 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:31:45,574 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-12 02:31:45,574 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-12 02:31:45,575 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:31:45,575 INFO L85 PathProgramCache]: Analyzing trace with hash -1194426463, now seen corresponding path program 1 times [2023-11-12 02:31:45,575 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:31:45,576 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1730447112] [2023-11-12 02:31:45,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:31:45,576 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:31:45,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:31:45,844 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:31:45,844 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:31:45,845 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1730447112] [2023-11-12 02:31:45,845 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1730447112] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:31:45,845 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:31:45,847 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 02:31:45,847 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923054621] [2023-11-12 02:31:45,847 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:31:45,848 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 02:31:45,848 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:31:45,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 02:31:45,850 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 02:31:46,017 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 148 out of 353 [2023-11-12 02:31:46,019 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 26 places, 25 transitions, 84 flow. Second operand has 4 states, 4 states have (on average 151.75) internal successors, (607), 4 states have internal predecessors, (607), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:46,019 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:31:46,019 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 148 of 353 [2023-11-12 02:31:46,020 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:31:46,145 INFO L124 PetriNetUnfolderBase]: 112/201 cut-off events. [2023-11-12 02:31:46,145 INFO L125 PetriNetUnfolderBase]: For 71/71 co-relation queries the response was YES. [2023-11-12 02:31:46,146 INFO L83 FinitePrefix]: Finished finitePrefix Result has 486 conditions, 201 events. 112/201 cut-off events. For 71/71 co-relation queries the response was YES. Maximal size of possible extension queue 21. Compared 686 event pairs, 55 based on Foata normal form. 0/178 useless extension candidates. Maximal degree in co-relation 406. Up to 165 conditions per place. [2023-11-12 02:31:46,148 INFO L140 encePairwiseOnDemand]: 349/353 looper letters, 20 selfloop transitions, 2 changer transitions 12/36 dead transitions. [2023-11-12 02:31:46,149 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 29 places, 36 transitions, 178 flow [2023-11-12 02:31:46,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 02:31:46,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-11-12 02:31:46,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 625 transitions. [2023-11-12 02:31:46,153 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4426345609065156 [2023-11-12 02:31:46,153 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 625 transitions. [2023-11-12 02:31:46,153 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 625 transitions. [2023-11-12 02:31:46,154 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:31:46,154 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 625 transitions. [2023-11-12 02:31:46,157 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 156.25) internal successors, (625), 4 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) [2023-11-12 02:31:46,162 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 353.0) internal successors, (1765), 5 states have internal predecessors, (1765), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:46,165 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 353.0) internal successors, (1765), 5 states have internal predecessors, (1765), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:46,165 INFO L175 Difference]: Start difference. First operand has 26 places, 25 transitions, 84 flow. Second operand 4 states and 625 transitions. [2023-11-12 02:31:46,165 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 29 places, 36 transitions, 178 flow [2023-11-12 02:31:46,167 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 28 places, 36 transitions, 172 flow, removed 2 selfloop flow, removed 1 redundant places. [2023-11-12 02:31:46,169 INFO L231 Difference]: Finished difference. Result has 29 places, 24 transitions, 78 flow [2023-11-12 02:31:46,169 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=353, PETRI_DIFFERENCE_MINUEND_FLOW=78, PETRI_DIFFERENCE_MINUEND_PLACES=25, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=25, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=23, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=78, PETRI_PLACES=29, PETRI_TRANSITIONS=24} [2023-11-12 02:31:46,170 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, 6 predicate places. [2023-11-12 02:31:46,170 INFO L495 AbstractCegarLoop]: Abstraction has has 29 places, 24 transitions, 78 flow [2023-11-12 02:31:46,171 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 151.75) internal successors, (607), 4 states have internal predecessors, (607), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:46,172 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:31:46,172 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:31:46,172 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-12 02:31:46,172 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-12 02:31:46,173 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:31:46,173 INFO L85 PathProgramCache]: Analyzing trace with hash 1146226140, now seen corresponding path program 1 times [2023-11-12 02:31:46,173 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:31:46,174 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [174339262] [2023-11-12 02:31:46,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:31:46,174 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:31:46,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:31:46,321 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 02:31:46,322 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:31:46,322 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [174339262] [2023-11-12 02:31:46,322 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [174339262] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:31:46,322 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:31:46,323 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 02:31:46,323 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255974448] [2023-11-12 02:31:46,323 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:31:46,324 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 02:31:46,324 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:31:46,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 02:31:46,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-12 02:31:46,453 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 147 out of 353 [2023-11-12 02:31:46,455 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 29 places, 24 transitions, 78 flow. Second operand has 5 states, 5 states have (on average 150.0) internal successors, (750), 5 states have internal predecessors, (750), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:46,455 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:31:46,455 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 147 of 353 [2023-11-12 02:31:46,455 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:31:46,605 INFO L124 PetriNetUnfolderBase]: 160/290 cut-off events. [2023-11-12 02:31:46,605 INFO L125 PetriNetUnfolderBase]: For 105/108 co-relation queries the response was YES. [2023-11-12 02:31:46,606 INFO L83 FinitePrefix]: Finished finitePrefix Result has 696 conditions, 290 events. 160/290 cut-off events. For 105/108 co-relation queries the response was YES. Maximal size of possible extension queue 28. Compared 1123 event pairs, 70 based on Foata normal form. 13/296 useless extension candidates. Maximal degree in co-relation 681. Up to 106 conditions per place. [2023-11-12 02:31:46,609 INFO L140 encePairwiseOnDemand]: 348/353 looper letters, 43 selfloop transitions, 6 changer transitions 0/51 dead transitions. [2023-11-12 02:31:46,609 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 31 places, 51 transitions, 252 flow [2023-11-12 02:31:46,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 02:31:46,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-11-12 02:31:46,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 781 transitions. [2023-11-12 02:31:46,614 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4424929178470255 [2023-11-12 02:31:46,614 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 781 transitions. [2023-11-12 02:31:46,614 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 781 transitions. [2023-11-12 02:31:46,615 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:31:46,615 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 781 transitions. [2023-11-12 02:31:46,618 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 156.2) internal successors, (781), 5 states have internal predecessors, (781), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:46,623 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 353.0) internal successors, (2118), 6 states have internal predecessors, (2118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:46,625 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 353.0) internal successors, (2118), 6 states have internal predecessors, (2118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:46,625 INFO L175 Difference]: Start difference. First operand has 29 places, 24 transitions, 78 flow. Second operand 5 states and 781 transitions. [2023-11-12 02:31:46,626 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 31 places, 51 transitions, 252 flow [2023-11-12 02:31:46,627 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 27 places, 51 transitions, 240 flow, removed 4 selfloop flow, removed 4 redundant places. [2023-11-12 02:31:46,629 INFO L231 Difference]: Finished difference. Result has 30 places, 27 transitions, 107 flow [2023-11-12 02:31:46,629 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=353, PETRI_DIFFERENCE_MINUEND_FLOW=70, PETRI_DIFFERENCE_MINUEND_PLACES=23, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=24, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=18, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=107, PETRI_PLACES=30, PETRI_TRANSITIONS=27} [2023-11-12 02:31:46,630 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, 7 predicate places. [2023-11-12 02:31:46,631 INFO L495 AbstractCegarLoop]: Abstraction has has 30 places, 27 transitions, 107 flow [2023-11-12 02:31:46,632 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 150.0) internal successors, (750), 5 states have internal predecessors, (750), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:46,632 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:31:46,632 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:31:46,632 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-12 02:31:46,633 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-12 02:31:46,633 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:31:46,633 INFO L85 PathProgramCache]: Analyzing trace with hash 702995451, now seen corresponding path program 1 times [2023-11-12 02:31:46,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:31:46,634 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1075631045] [2023-11-12 02:31:46,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:31:46,634 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:31:46,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:31:46,798 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 02:31:46,798 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:31:46,798 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1075631045] [2023-11-12 02:31:46,799 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1075631045] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:31:46,799 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:31:46,799 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 02:31:46,803 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163296358] [2023-11-12 02:31:46,804 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:31:46,805 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 02:31:46,805 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:31:46,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 02:31:46,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-12 02:31:46,950 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 147 out of 353 [2023-11-12 02:31:46,952 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 30 places, 27 transitions, 107 flow. Second operand has 5 states, 5 states have (on average 150.2) internal successors, (751), 5 states have internal predecessors, (751), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:46,952 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:31:46,952 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 147 of 353 [2023-11-12 02:31:46,952 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:31:47,110 INFO L124 PetriNetUnfolderBase]: 132/245 cut-off events. [2023-11-12 02:31:47,110 INFO L125 PetriNetUnfolderBase]: For 102/102 co-relation queries the response was YES. [2023-11-12 02:31:47,113 INFO L83 FinitePrefix]: Finished finitePrefix Result has 633 conditions, 245 events. 132/245 cut-off events. For 102/102 co-relation queries the response was YES. Maximal size of possible extension queue 23. Compared 867 event pairs, 54 based on Foata normal form. 0/222 useless extension candidates. Maximal degree in co-relation 610. Up to 113 conditions per place. [2023-11-12 02:31:47,115 INFO L140 encePairwiseOnDemand]: 347/353 looper letters, 32 selfloop transitions, 5 changer transitions 10/49 dead transitions. [2023-11-12 02:31:47,115 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 34 places, 49 transitions, 262 flow [2023-11-12 02:31:47,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 02:31:47,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-11-12 02:31:47,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 779 transitions. [2023-11-12 02:31:47,119 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4413597733711048 [2023-11-12 02:31:47,120 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 779 transitions. [2023-11-12 02:31:47,120 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 779 transitions. [2023-11-12 02:31:47,121 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:31:47,121 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 779 transitions. [2023-11-12 02:31:47,124 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 155.8) internal successors, (779), 5 states have internal predecessors, (779), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:47,129 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 353.0) internal successors, (2118), 6 states have internal predecessors, (2118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:47,130 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 353.0) internal successors, (2118), 6 states have internal predecessors, (2118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:47,130 INFO L175 Difference]: Start difference. First operand has 30 places, 27 transitions, 107 flow. Second operand 5 states and 779 transitions. [2023-11-12 02:31:47,130 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 34 places, 49 transitions, 262 flow [2023-11-12 02:31:47,134 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 32 places, 49 transitions, 252 flow, removed 3 selfloop flow, removed 2 redundant places. [2023-11-12 02:31:47,135 INFO L231 Difference]: Finished difference. Result has 34 places, 27 transitions, 117 flow [2023-11-12 02:31:47,136 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=353, PETRI_DIFFERENCE_MINUEND_FLOW=99, PETRI_DIFFERENCE_MINUEND_PLACES=28, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=27, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=22, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=117, PETRI_PLACES=34, PETRI_TRANSITIONS=27} [2023-11-12 02:31:47,139 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, 11 predicate places. [2023-11-12 02:31:47,139 INFO L495 AbstractCegarLoop]: Abstraction has has 34 places, 27 transitions, 117 flow [2023-11-12 02:31:47,140 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 150.2) internal successors, (751), 5 states have internal predecessors, (751), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:47,140 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:31:47,140 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:31:47,140 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-12 02:31:47,141 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-12 02:31:47,141 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:31:47,141 INFO L85 PathProgramCache]: Analyzing trace with hash -436769606, now seen corresponding path program 1 times [2023-11-12 02:31:47,142 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:31:47,142 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [578127309] [2023-11-12 02:31:47,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:31:47,142 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:31:47,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:31:47,365 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 02:31:47,365 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:31:47,365 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [578127309] [2023-11-12 02:31:47,365 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [578127309] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 02:31:47,366 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [945666239] [2023-11-12 02:31:47,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:31:47,366 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 02:31:47,366 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 [2023-11-12 02:31:47,370 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 02:31:47,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 02:31:47,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:31:47,509 INFO L262 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-12 02:31:47,514 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 02:31:47,661 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 02:31:47,661 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 02:31:47,843 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 02:31:47,844 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [945666239] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-12 02:31:47,844 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-12 02:31:47,844 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5, 5] total 13 [2023-11-12 02:31:47,844 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100547628] [2023-11-12 02:31:47,845 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:31:47,845 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-12 02:31:47,845 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:31:47,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-12 02:31:47,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2023-11-12 02:31:48,077 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 140 out of 353 [2023-11-12 02:31:48,078 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 34 places, 27 transitions, 117 flow. Second operand has 6 states, 6 states have (on average 142.66666666666666) internal successors, (856), 6 states have internal predecessors, (856), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:48,079 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:31:48,079 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 140 of 353 [2023-11-12 02:31:48,079 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:31:48,246 INFO L124 PetriNetUnfolderBase]: 125/238 cut-off events. [2023-11-12 02:31:48,246 INFO L125 PetriNetUnfolderBase]: For 162/166 co-relation queries the response was YES. [2023-11-12 02:31:48,247 INFO L83 FinitePrefix]: Finished finitePrefix Result has 659 conditions, 238 events. 125/238 cut-off events. For 162/166 co-relation queries the response was YES. Maximal size of possible extension queue 25. Compared 910 event pairs, 41 based on Foata normal form. 12/243 useless extension candidates. Maximal degree in co-relation 632. Up to 85 conditions per place. [2023-11-12 02:31:48,249 INFO L140 encePairwiseOnDemand]: 346/353 looper letters, 38 selfloop transitions, 8 changer transitions 0/48 dead transitions. [2023-11-12 02:31:48,249 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 38 places, 48 transitions, 275 flow [2023-11-12 02:31:48,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-12 02:31:48,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-11-12 02:31:48,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1023 transitions. [2023-11-12 02:31:48,254 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4140024281667341 [2023-11-12 02:31:48,255 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1023 transitions. [2023-11-12 02:31:48,255 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1023 transitions. [2023-11-12 02:31:48,256 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:31:48,256 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1023 transitions. [2023-11-12 02:31:48,259 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 146.14285714285714) internal successors, (1023), 7 states have internal predecessors, (1023), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:48,264 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 353.0) internal successors, (2824), 8 states have internal predecessors, (2824), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:48,265 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 353.0) internal successors, (2824), 8 states have internal predecessors, (2824), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:48,266 INFO L175 Difference]: Start difference. First operand has 34 places, 27 transitions, 117 flow. Second operand 7 states and 1023 transitions. [2023-11-12 02:31:48,266 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 38 places, 48 transitions, 275 flow [2023-11-12 02:31:48,267 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 35 places, 48 transitions, 266 flow, removed 2 selfloop flow, removed 3 redundant places. [2023-11-12 02:31:48,270 INFO L231 Difference]: Finished difference. Result has 37 places, 28 transitions, 140 flow [2023-11-12 02:31:48,270 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=353, PETRI_DIFFERENCE_MINUEND_FLOW=110, PETRI_DIFFERENCE_MINUEND_PLACES=29, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=27, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=7, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=19, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=140, PETRI_PLACES=37, PETRI_TRANSITIONS=28} [2023-11-12 02:31:48,272 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, 14 predicate places. [2023-11-12 02:31:48,273 INFO L495 AbstractCegarLoop]: Abstraction has has 37 places, 28 transitions, 140 flow [2023-11-12 02:31:48,273 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 142.66666666666666) internal successors, (856), 6 states have internal predecessors, (856), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:48,274 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:31:48,274 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:31:48,291 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-12 02:31:48,480 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-12 02:31:48,480 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-12 02:31:48,481 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:31:48,481 INFO L85 PathProgramCache]: Analyzing trace with hash 565472432, now seen corresponding path program 1 times [2023-11-12 02:31:48,481 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:31:48,481 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [895437626] [2023-11-12 02:31:48,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:31:48,482 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:31:48,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:31:49,211 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 02:31:49,212 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:31:49,212 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [895437626] [2023-11-12 02:31:49,213 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [895437626] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:31:49,213 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:31:49,213 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-12 02:31:49,213 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263773165] [2023-11-12 02:31:49,213 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:31:49,214 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 02:31:49,214 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:31:49,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 02:31:49,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-12 02:31:49,516 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 140 out of 353 [2023-11-12 02:31:49,518 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 37 places, 28 transitions, 140 flow. Second operand has 7 states, 7 states have (on average 142.42857142857142) internal successors, (997), 7 states have internal predecessors, (997), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:49,518 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:31:49,518 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 140 of 353 [2023-11-12 02:31:49,518 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:31:49,754 INFO L124 PetriNetUnfolderBase]: 131/248 cut-off events. [2023-11-12 02:31:49,754 INFO L125 PetriNetUnfolderBase]: For 218/218 co-relation queries the response was YES. [2023-11-12 02:31:49,755 INFO L83 FinitePrefix]: Finished finitePrefix Result has 743 conditions, 248 events. 131/248 cut-off events. For 218/218 co-relation queries the response was YES. Maximal size of possible extension queue 28. Compared 923 event pairs, 31 based on Foata normal form. 4/247 useless extension candidates. Maximal degree in co-relation 713. Up to 193 conditions per place. [2023-11-12 02:31:49,757 INFO L140 encePairwiseOnDemand]: 346/353 looper letters, 34 selfloop transitions, 9 changer transitions 1/46 dead transitions. [2023-11-12 02:31:49,757 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 43 places, 46 transitions, 286 flow [2023-11-12 02:31:49,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-12 02:31:49,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-11-12 02:31:49,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1020 transitions. [2023-11-12 02:31:49,762 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.41278834479967624 [2023-11-12 02:31:49,762 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1020 transitions. [2023-11-12 02:31:49,762 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1020 transitions. [2023-11-12 02:31:49,763 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:31:49,764 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1020 transitions. [2023-11-12 02:31:49,767 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 145.71428571428572) internal successors, (1020), 7 states have internal predecessors, (1020), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:49,772 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 353.0) internal successors, (2824), 8 states have internal predecessors, (2824), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:49,773 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 353.0) internal successors, (2824), 8 states have internal predecessors, (2824), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:49,773 INFO L175 Difference]: Start difference. First operand has 37 places, 28 transitions, 140 flow. Second operand 7 states and 1020 transitions. [2023-11-12 02:31:49,773 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 43 places, 46 transitions, 286 flow [2023-11-12 02:31:49,775 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 39 places, 46 transitions, 268 flow, removed 1 selfloop flow, removed 4 redundant places. [2023-11-12 02:31:49,776 INFO L231 Difference]: Finished difference. Result has 42 places, 32 transitions, 180 flow [2023-11-12 02:31:49,776 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=353, PETRI_DIFFERENCE_MINUEND_FLOW=124, PETRI_DIFFERENCE_MINUEND_PLACES=33, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=28, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=20, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=180, PETRI_PLACES=42, PETRI_TRANSITIONS=32} [2023-11-12 02:31:49,777 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, 19 predicate places. [2023-11-12 02:31:49,777 INFO L495 AbstractCegarLoop]: Abstraction has has 42 places, 32 transitions, 180 flow [2023-11-12 02:31:49,778 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 142.42857142857142) internal successors, (997), 7 states have internal predecessors, (997), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:49,778 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:31:49,778 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:31:49,778 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-12 02:31:49,779 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-12 02:31:49,779 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:31:49,779 INFO L85 PathProgramCache]: Analyzing trace with hash 1392465453, now seen corresponding path program 1 times [2023-11-12 02:31:49,779 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:31:49,780 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [517711072] [2023-11-12 02:31:49,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:31:49,780 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:31:49,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:31:50,600 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:31:50,601 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:31:50,601 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [517711072] [2023-11-12 02:31:50,601 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [517711072] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 02:31:50,601 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2129034871] [2023-11-12 02:31:50,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:31:50,602 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 02:31:50,602 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 [2023-11-12 02:31:50,603 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 02:31:50,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 02:31:50,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:31:50,719 INFO L262 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-12 02:31:50,724 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 02:31:51,128 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:31:51,129 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 02:31:51,318 INFO L322 Elim1Store]: treesize reduction 11, result has 85.7 percent of original size [2023-11-12 02:31:51,319 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 51 treesize of output 84 [2023-11-12 02:31:51,660 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:31:51,660 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2129034871] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-12 02:31:51,661 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-12 02:31:51,661 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [8, 8] total 19 [2023-11-12 02:31:51,661 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575879049] [2023-11-12 02:31:51,661 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:31:51,662 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-12 02:31:51,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:31:51,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-12 02:31:51,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2023-11-12 02:31:52,392 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 125 out of 353 [2023-11-12 02:31:52,393 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 42 places, 32 transitions, 180 flow. Second operand has 8 states, 8 states have (on average 127.125) internal successors, (1017), 8 states have internal predecessors, (1017), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:52,393 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:31:52,393 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 125 of 353 [2023-11-12 02:31:52,394 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:31:52,735 INFO L124 PetriNetUnfolderBase]: 132/251 cut-off events. [2023-11-12 02:31:52,735 INFO L125 PetriNetUnfolderBase]: For 371/379 co-relation queries the response was YES. [2023-11-12 02:31:52,736 INFO L83 FinitePrefix]: Finished finitePrefix Result has 826 conditions, 251 events. 132/251 cut-off events. For 371/379 co-relation queries the response was YES. Maximal size of possible extension queue 28. Compared 895 event pairs, 38 based on Foata normal form. 5/251 useless extension candidates. Maximal degree in co-relation 795. Up to 201 conditions per place. [2023-11-12 02:31:52,738 INFO L140 encePairwiseOnDemand]: 344/353 looper letters, 29 selfloop transitions, 9 changer transitions 7/47 dead transitions. [2023-11-12 02:31:52,738 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 49 places, 47 transitions, 327 flow [2023-11-12 02:31:52,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-12 02:31:52,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2023-11-12 02:31:52,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 1041 transitions. [2023-11-12 02:31:52,744 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3686260623229462 [2023-11-12 02:31:52,745 INFO L72 ComplementDD]: Start complementDD. Operand 8 states and 1041 transitions. [2023-11-12 02:31:52,745 INFO L73 IsDeterministic]: Start isDeterministic. Operand 8 states and 1041 transitions. [2023-11-12 02:31:52,746 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:31:52,746 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 8 states and 1041 transitions. [2023-11-12 02:31:52,750 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 9 states, 8 states have (on average 130.125) internal successors, (1041), 8 states have internal predecessors, (1041), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:52,756 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 9 states, 9 states have (on average 353.0) internal successors, (3177), 9 states have internal predecessors, (3177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:52,758 INFO L81 ComplementDD]: Finished complementDD. Result has 9 states, 9 states have (on average 353.0) internal successors, (3177), 9 states have internal predecessors, (3177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:52,758 INFO L175 Difference]: Start difference. First operand has 42 places, 32 transitions, 180 flow. Second operand 8 states and 1041 transitions. [2023-11-12 02:31:52,758 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 49 places, 47 transitions, 327 flow [2023-11-12 02:31:52,762 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 45 places, 47 transitions, 309 flow, removed 2 selfloop flow, removed 4 redundant places. [2023-11-12 02:31:52,764 INFO L231 Difference]: Finished difference. Result has 48 places, 34 transitions, 208 flow [2023-11-12 02:31:52,764 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=353, PETRI_DIFFERENCE_MINUEND_FLOW=166, PETRI_DIFFERENCE_MINUEND_PLACES=38, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=32, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=7, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=24, PETRI_DIFFERENCE_SUBTRAHEND_STATES=8, PETRI_FLOW=208, PETRI_PLACES=48, PETRI_TRANSITIONS=34} [2023-11-12 02:31:52,767 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, 25 predicate places. [2023-11-12 02:31:52,767 INFO L495 AbstractCegarLoop]: Abstraction has has 48 places, 34 transitions, 208 flow [2023-11-12 02:31:52,769 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 127.125) internal successors, (1017), 8 states have internal predecessors, (1017), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:52,769 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:31:52,769 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:31:52,781 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 02:31:52,975 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-12 02:31:52,976 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-12 02:31:52,978 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:31:52,978 INFO L85 PathProgramCache]: Analyzing trace with hash 1155684932, now seen corresponding path program 2 times [2023-11-12 02:31:52,978 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:31:52,979 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1884654755] [2023-11-12 02:31:52,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:31:52,980 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:31:53,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:31:53,627 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 02:31:53,627 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:31:53,628 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1884654755] [2023-11-12 02:31:53,628 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1884654755] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:31:53,628 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:31:53,628 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-12 02:31:53,628 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1134367339] [2023-11-12 02:31:53,628 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:31:53,629 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-12 02:31:53,630 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:31:53,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-12 02:31:53,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2023-11-12 02:31:54,108 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 141 out of 353 [2023-11-12 02:31:54,110 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 48 places, 34 transitions, 208 flow. Second operand has 8 states, 8 states have (on average 143.125) internal successors, (1145), 8 states have internal predecessors, (1145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:54,110 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:31:54,110 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 141 of 353 [2023-11-12 02:31:54,110 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:31:54,363 INFO L124 PetriNetUnfolderBase]: 131/258 cut-off events. [2023-11-12 02:31:54,364 INFO L125 PetriNetUnfolderBase]: For 384/384 co-relation queries the response was YES. [2023-11-12 02:31:54,365 INFO L83 FinitePrefix]: Finished finitePrefix Result has 911 conditions, 258 events. 131/258 cut-off events. For 384/384 co-relation queries the response was YES. Maximal size of possible extension queue 30. Compared 996 event pairs, 40 based on Foata normal form. 4/258 useless extension candidates. Maximal degree in co-relation 877. Up to 201 conditions per place. [2023-11-12 02:31:54,367 INFO L140 encePairwiseOnDemand]: 345/353 looper letters, 31 selfloop transitions, 10 changer transitions 8/51 dead transitions. [2023-11-12 02:31:54,367 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 53 places, 51 transitions, 355 flow [2023-11-12 02:31:54,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-12 02:31:54,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-11-12 02:31:54,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1030 transitions. [2023-11-12 02:31:54,373 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4168352893565358 [2023-11-12 02:31:54,373 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1030 transitions. [2023-11-12 02:31:54,373 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1030 transitions. [2023-11-12 02:31:54,374 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:31:54,375 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1030 transitions. [2023-11-12 02:31:54,378 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 147.14285714285714) internal successors, (1030), 7 states have internal predecessors, (1030), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:54,384 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 353.0) internal successors, (2824), 8 states have internal predecessors, (2824), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:54,386 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 353.0) internal successors, (2824), 8 states have internal predecessors, (2824), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:54,386 INFO L175 Difference]: Start difference. First operand has 48 places, 34 transitions, 208 flow. Second operand 7 states and 1030 transitions. [2023-11-12 02:31:54,386 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 53 places, 51 transitions, 355 flow [2023-11-12 02:31:54,389 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 48 places, 51 transitions, 342 flow, removed 1 selfloop flow, removed 5 redundant places. [2023-11-12 02:31:54,391 INFO L231 Difference]: Finished difference. Result has 49 places, 35 transitions, 221 flow [2023-11-12 02:31:54,391 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=353, PETRI_DIFFERENCE_MINUEND_FLOW=195, PETRI_DIFFERENCE_MINUEND_PLACES=42, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=34, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=9, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=24, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=221, PETRI_PLACES=49, PETRI_TRANSITIONS=35} [2023-11-12 02:31:54,393 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, 26 predicate places. [2023-11-12 02:31:54,393 INFO L495 AbstractCegarLoop]: Abstraction has has 49 places, 35 transitions, 221 flow [2023-11-12 02:31:54,394 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 143.125) internal successors, (1145), 8 states have internal predecessors, (1145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:54,394 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:31:54,395 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:31:54,395 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-12 02:31:54,395 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-12 02:31:54,396 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:31:54,396 INFO L85 PathProgramCache]: Analyzing trace with hash -55898199, now seen corresponding path program 2 times [2023-11-12 02:31:54,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:31:54,396 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1640648521] [2023-11-12 02:31:54,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:31:54,397 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:31:54,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:31:55,217 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:31:55,217 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:31:55,217 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1640648521] [2023-11-12 02:31:55,217 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1640648521] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 02:31:55,218 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1991362558] [2023-11-12 02:31:55,218 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-12 02:31:55,218 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 02:31:55,218 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 [2023-11-12 02:31:55,220 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 02:31:55,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 02:31:55,405 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-12 02:31:55,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 02:31:55,407 INFO L262 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-12 02:31:55,410 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 02:31:55,718 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:31:55,719 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 02:31:55,926 INFO L322 Elim1Store]: treesize reduction 28, result has 63.6 percent of original size [2023-11-12 02:31:55,927 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 40 treesize of output 56 [2023-11-12 02:31:55,956 INFO L322 Elim1Store]: treesize reduction 10, result has 9.1 percent of original size [2023-11-12 02:31:55,956 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 4 [2023-11-12 02:31:55,965 INFO L322 Elim1Store]: treesize reduction 10, result has 9.1 percent of original size [2023-11-12 02:31:55,965 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 4 [2023-11-12 02:31:56,151 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:31:56,151 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1991362558] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 02:31:56,151 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 02:31:56,151 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 7] total 17 [2023-11-12 02:31:56,152 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3024360] [2023-11-12 02:31:56,152 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 02:31:56,152 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-12 02:31:56,153 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:31:56,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-12 02:31:56,154 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2023-11-12 02:31:57,701 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 123 out of 353 [2023-11-12 02:31:57,705 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 49 places, 35 transitions, 221 flow. Second operand has 18 states, 18 states have (on average 124.88888888888889) internal successors, (2248), 18 states have internal predecessors, (2248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:57,705 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:31:57,705 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 123 of 353 [2023-11-12 02:31:57,705 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:31:58,083 INFO L124 PetriNetUnfolderBase]: 167/333 cut-off events. [2023-11-12 02:31:58,083 INFO L125 PetriNetUnfolderBase]: For 623/623 co-relation queries the response was YES. [2023-11-12 02:31:58,084 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1198 conditions, 333 events. 167/333 cut-off events. For 623/623 co-relation queries the response was YES. Maximal size of possible extension queue 32. Compared 1395 event pairs, 26 based on Foata normal form. 12/338 useless extension candidates. Maximal degree in co-relation 1165. Up to 210 conditions per place. [2023-11-12 02:31:58,087 INFO L140 encePairwiseOnDemand]: 342/353 looper letters, 39 selfloop transitions, 17 changer transitions 2/60 dead transitions. [2023-11-12 02:31:58,087 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 57 places, 60 transitions, 462 flow [2023-11-12 02:31:58,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-12 02:31:58,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2023-11-12 02:31:58,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 1158 transitions. [2023-11-12 02:31:58,093 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.364494806421152 [2023-11-12 02:31:58,093 INFO L72 ComplementDD]: Start complementDD. Operand 9 states and 1158 transitions. [2023-11-12 02:31:58,093 INFO L73 IsDeterministic]: Start isDeterministic. Operand 9 states and 1158 transitions. [2023-11-12 02:31:58,094 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:31:58,094 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 9 states and 1158 transitions. [2023-11-12 02:31:58,098 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 10 states, 9 states have (on average 128.66666666666666) internal successors, (1158), 9 states have internal predecessors, (1158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:58,103 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 10 states, 10 states have (on average 353.0) internal successors, (3530), 10 states have internal predecessors, (3530), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:58,105 INFO L81 ComplementDD]: Finished complementDD. Result has 10 states, 10 states have (on average 353.0) internal successors, (3530), 10 states have internal predecessors, (3530), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:58,105 INFO L175 Difference]: Start difference. First operand has 49 places, 35 transitions, 221 flow. Second operand 9 states and 1158 transitions. [2023-11-12 02:31:58,105 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 57 places, 60 transitions, 462 flow [2023-11-12 02:31:58,108 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 52 places, 60 transitions, 436 flow, removed 0 selfloop flow, removed 5 redundant places. [2023-11-12 02:31:58,109 INFO L231 Difference]: Finished difference. Result has 53 places, 41 transitions, 294 flow [2023-11-12 02:31:58,110 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=353, PETRI_DIFFERENCE_MINUEND_FLOW=203, PETRI_DIFFERENCE_MINUEND_PLACES=44, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=35, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=12, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=22, PETRI_DIFFERENCE_SUBTRAHEND_STATES=9, PETRI_FLOW=294, PETRI_PLACES=53, PETRI_TRANSITIONS=41} [2023-11-12 02:31:58,110 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, 30 predicate places. [2023-11-12 02:31:58,111 INFO L495 AbstractCegarLoop]: Abstraction has has 53 places, 41 transitions, 294 flow [2023-11-12 02:31:58,112 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 124.88888888888889) internal successors, (2248), 18 states have internal predecessors, (2248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:31:58,112 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:31:58,112 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:31:58,123 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 02:31:58,318 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 02:31:58,319 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-12 02:31:58,319 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:31:58,319 INFO L85 PathProgramCache]: Analyzing trace with hash 434114473, now seen corresponding path program 3 times [2023-11-12 02:31:58,319 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:31:58,319 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1503409607] [2023-11-12 02:31:58,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:31:58,320 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:31:58,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:31:58,952 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:31:58,953 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:31:58,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1503409607] [2023-11-12 02:31:58,953 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1503409607] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 02:31:58,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870345992] [2023-11-12 02:31:58,953 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 02:31:58,954 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 02:31:58,954 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 [2023-11-12 02:31:58,955 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 02:31:58,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 02:31:59,079 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-12 02:31:59,080 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 02:31:59,082 INFO L262 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-12 02:31:59,084 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 02:31:59,391 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:31:59,391 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 02:31:59,570 INFO L322 Elim1Store]: treesize reduction 28, result has 63.6 percent of original size [2023-11-12 02:31:59,571 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 40 treesize of output 56 [2023-11-12 02:31:59,606 INFO L322 Elim1Store]: treesize reduction 10, result has 9.1 percent of original size [2023-11-12 02:31:59,607 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 4 [2023-11-12 02:31:59,616 INFO L322 Elim1Store]: treesize reduction 10, result has 9.1 percent of original size [2023-11-12 02:31:59,617 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 4 [2023-11-12 02:31:59,837 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:31:59,837 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1870345992] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-12 02:31:59,838 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-12 02:31:59,838 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [8, 8] total 18 [2023-11-12 02:31:59,838 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202207895] [2023-11-12 02:31:59,838 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:31:59,839 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-12 02:31:59,839 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:31:59,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-12 02:31:59,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2023-11-12 02:32:00,401 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 125 out of 353 [2023-11-12 02:32:00,402 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 53 places, 41 transitions, 294 flow. Second operand has 8 states, 8 states have (on average 127.125) internal successors, (1017), 8 states have internal predecessors, (1017), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:00,402 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:32:00,402 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 125 of 353 [2023-11-12 02:32:00,402 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:32:00,743 INFO L124 PetriNetUnfolderBase]: 156/305 cut-off events. [2023-11-12 02:32:00,743 INFO L125 PetriNetUnfolderBase]: For 676/678 co-relation queries the response was YES. [2023-11-12 02:32:00,744 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1183 conditions, 305 events. 156/305 cut-off events. For 676/678 co-relation queries the response was YES. Maximal size of possible extension queue 31. Compared 1249 event pairs, 36 based on Foata normal form. 2/300 useless extension candidates. Maximal degree in co-relation 1148. Up to 242 conditions per place. [2023-11-12 02:32:00,747 INFO L140 encePairwiseOnDemand]: 343/353 looper letters, 31 selfloop transitions, 13 changer transitions 4/50 dead transitions. [2023-11-12 02:32:00,747 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 60 places, 50 transitions, 411 flow [2023-11-12 02:32:00,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-12 02:32:00,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2023-11-12 02:32:00,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 1041 transitions. [2023-11-12 02:32:00,754 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3686260623229462 [2023-11-12 02:32:00,755 INFO L72 ComplementDD]: Start complementDD. Operand 8 states and 1041 transitions. [2023-11-12 02:32:00,755 INFO L73 IsDeterministic]: Start isDeterministic. Operand 8 states and 1041 transitions. [2023-11-12 02:32:00,756 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:32:00,756 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 8 states and 1041 transitions. [2023-11-12 02:32:00,759 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 9 states, 8 states have (on average 130.125) internal successors, (1041), 8 states have internal predecessors, (1041), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:00,764 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 9 states, 9 states have (on average 353.0) internal successors, (3177), 9 states have internal predecessors, (3177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:00,765 INFO L81 ComplementDD]: Finished complementDD. Result has 9 states, 9 states have (on average 353.0) internal successors, (3177), 9 states have internal predecessors, (3177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:00,765 INFO L175 Difference]: Start difference. First operand has 53 places, 41 transitions, 294 flow. Second operand 8 states and 1041 transitions. [2023-11-12 02:32:00,766 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 60 places, 50 transitions, 411 flow [2023-11-12 02:32:00,769 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 56 places, 50 transitions, 393 flow, removed 2 selfloop flow, removed 4 redundant places. [2023-11-12 02:32:00,770 INFO L231 Difference]: Finished difference. Result has 57 places, 40 transitions, 295 flow [2023-11-12 02:32:00,770 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=353, PETRI_DIFFERENCE_MINUEND_FLOW=262, PETRI_DIFFERENCE_MINUEND_PLACES=49, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=40, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=13, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=27, PETRI_DIFFERENCE_SUBTRAHEND_STATES=8, PETRI_FLOW=295, PETRI_PLACES=57, PETRI_TRANSITIONS=40} [2023-11-12 02:32:00,771 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, 34 predicate places. [2023-11-12 02:32:00,771 INFO L495 AbstractCegarLoop]: Abstraction has has 57 places, 40 transitions, 295 flow [2023-11-12 02:32:00,772 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 127.125) internal successors, (1017), 8 states have internal predecessors, (1017), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:00,772 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:32:00,772 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:32:00,783 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-12 02:32:00,978 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 02:32:00,979 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-12 02:32:00,980 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:32:00,980 INFO L85 PathProgramCache]: Analyzing trace with hash 1256637768, now seen corresponding path program 3 times [2023-11-12 02:32:00,980 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:32:00,980 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [391262894] [2023-11-12 02:32:00,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:32:00,981 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:32:01,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:32:01,331 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 02:32:01,332 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:32:01,332 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [391262894] [2023-11-12 02:32:01,332 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [391262894] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 02:32:01,332 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [766240827] [2023-11-12 02:32:01,332 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 02:32:01,333 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 02:32:01,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 [2023-11-12 02:32:01,336 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 02:32:01,367 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-12 02:32:01,452 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-12 02:32:01,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 02:32:01,454 INFO L262 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-12 02:32:01,456 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 02:32:01,568 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 02:32:01,568 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 02:32:01,646 INFO L322 Elim1Store]: treesize reduction 28, result has 63.6 percent of original size [2023-11-12 02:32:01,647 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 40 treesize of output 56 [2023-11-12 02:32:01,697 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 02:32:01,697 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [766240827] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 02:32:01,698 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 02:32:01,698 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 4] total 10 [2023-11-12 02:32:01,698 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731294813] [2023-11-12 02:32:01,698 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 02:32:01,699 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-12 02:32:01,699 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:32:01,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-12 02:32:01,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2023-11-12 02:32:02,073 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 143 out of 353 [2023-11-12 02:32:02,075 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 57 places, 40 transitions, 295 flow. Second operand has 11 states, 11 states have (on average 145.9090909090909) internal successors, (1605), 11 states have internal predecessors, (1605), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:02,075 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:32:02,075 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 143 of 353 [2023-11-12 02:32:02,075 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:32:02,297 INFO L124 PetriNetUnfolderBase]: 149/296 cut-off events. [2023-11-12 02:32:02,298 INFO L125 PetriNetUnfolderBase]: For 767/769 co-relation queries the response was YES. [2023-11-12 02:32:02,299 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1164 conditions, 296 events. 149/296 cut-off events. For 767/769 co-relation queries the response was YES. Maximal size of possible extension queue 31. Compared 1202 event pairs, 32 based on Foata normal form. 4/293 useless extension candidates. Maximal degree in co-relation 1128. Up to 190 conditions per place. [2023-11-12 02:32:02,301 INFO L140 encePairwiseOnDemand]: 346/353 looper letters, 40 selfloop transitions, 12 changer transitions 1/55 dead transitions. [2023-11-12 02:32:02,301 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 62 places, 55 transitions, 454 flow [2023-11-12 02:32:02,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-12 02:32:02,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-11-12 02:32:02,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1046 transitions. [2023-11-12 02:32:02,306 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.42331040064751113 [2023-11-12 02:32:02,306 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1046 transitions. [2023-11-12 02:32:02,306 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1046 transitions. [2023-11-12 02:32:02,307 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:32:02,307 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1046 transitions. [2023-11-12 02:32:02,310 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 149.42857142857142) internal successors, (1046), 7 states have internal predecessors, (1046), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:02,315 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 353.0) internal successors, (2824), 8 states have internal predecessors, (2824), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:02,316 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 353.0) internal successors, (2824), 8 states have internal predecessors, (2824), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:02,316 INFO L175 Difference]: Start difference. First operand has 57 places, 40 transitions, 295 flow. Second operand 7 states and 1046 transitions. [2023-11-12 02:32:02,316 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 62 places, 55 transitions, 454 flow [2023-11-12 02:32:02,320 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 56 places, 55 transitions, 428 flow, removed 0 selfloop flow, removed 6 redundant places. [2023-11-12 02:32:02,321 INFO L231 Difference]: Finished difference. Result has 57 places, 40 transitions, 297 flow [2023-11-12 02:32:02,322 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=353, PETRI_DIFFERENCE_MINUEND_FLOW=269, PETRI_DIFFERENCE_MINUEND_PLACES=50, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=40, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=12, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=28, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=297, PETRI_PLACES=57, PETRI_TRANSITIONS=40} [2023-11-12 02:32:02,322 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, 34 predicate places. [2023-11-12 02:32:02,323 INFO L495 AbstractCegarLoop]: Abstraction has has 57 places, 40 transitions, 297 flow [2023-11-12 02:32:02,324 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 145.9090909090909) internal successors, (1605), 11 states have internal predecessors, (1605), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:02,324 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:32:02,324 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:32:02,338 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-12 02:32:02,530 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 02:32:02,530 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-12 02:32:02,531 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:32:02,531 INFO L85 PathProgramCache]: Analyzing trace with hash -41144973, now seen corresponding path program 4 times [2023-11-12 02:32:02,531 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:32:02,531 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766832986] [2023-11-12 02:32:02,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:32:02,531 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:32:02,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:32:03,264 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:32:03,264 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:32:03,264 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766832986] [2023-11-12 02:32:03,264 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1766832986] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 02:32:03,265 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [728885426] [2023-11-12 02:32:03,265 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 02:32:03,265 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 02:32:03,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 [2023-11-12 02:32:03,268 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 02:32:03,299 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-12 02:32:03,389 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 02:32:03,389 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 02:32:03,391 INFO L262 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-12 02:32:03,393 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 02:32:03,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 02:32:03,592 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 11 [2023-11-12 02:32:03,746 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 02:32:03,746 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 02:32:03,747 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [728885426] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:32:03,747 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 02:32:03,747 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [9] total 15 [2023-11-12 02:32:03,747 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440399819] [2023-11-12 02:32:03,747 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:32:03,748 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-12 02:32:03,748 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:32:03,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-12 02:32:03,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=205, Unknown=0, NotChecked=0, Total=240 [2023-11-12 02:32:04,214 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 135 out of 353 [2023-11-12 02:32:04,216 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 57 places, 40 transitions, 297 flow. Second operand has 8 states, 8 states have (on average 137.125) internal successors, (1097), 8 states have internal predecessors, (1097), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:04,216 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:32:04,216 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 135 of 353 [2023-11-12 02:32:04,216 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:32:04,486 INFO L124 PetriNetUnfolderBase]: 147/297 cut-off events. [2023-11-12 02:32:04,486 INFO L125 PetriNetUnfolderBase]: For 829/831 co-relation queries the response was YES. [2023-11-12 02:32:04,487 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1171 conditions, 297 events. 147/297 cut-off events. For 829/831 co-relation queries the response was YES. Maximal size of possible extension queue 31. Compared 1221 event pairs, 54 based on Foata normal form. 2/294 useless extension candidates. Maximal degree in co-relation 1135. Up to 236 conditions per place. [2023-11-12 02:32:04,490 INFO L140 encePairwiseOnDemand]: 345/353 looper letters, 32 selfloop transitions, 10 changer transitions 4/48 dead transitions. [2023-11-12 02:32:04,490 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 63 places, 48 transitions, 403 flow [2023-11-12 02:32:04,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-12 02:32:04,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-11-12 02:32:04,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 982 transitions. [2023-11-12 02:32:04,495 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.39740995548360986 [2023-11-12 02:32:04,495 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 982 transitions. [2023-11-12 02:32:04,495 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 982 transitions. [2023-11-12 02:32:04,496 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:32:04,496 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 982 transitions. [2023-11-12 02:32:04,500 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 140.28571428571428) internal successors, (982), 7 states have internal predecessors, (982), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:04,504 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 353.0) internal successors, (2824), 8 states have internal predecessors, (2824), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:04,505 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 353.0) internal successors, (2824), 8 states have internal predecessors, (2824), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:04,506 INFO L175 Difference]: Start difference. First operand has 57 places, 40 transitions, 297 flow. Second operand 7 states and 982 transitions. [2023-11-12 02:32:04,506 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 63 places, 48 transitions, 403 flow [2023-11-12 02:32:04,511 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 56 places, 48 transitions, 366 flow, removed 3 selfloop flow, removed 7 redundant places. [2023-11-12 02:32:04,512 INFO L231 Difference]: Finished difference. Result has 56 places, 38 transitions, 258 flow [2023-11-12 02:32:04,512 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=353, PETRI_DIFFERENCE_MINUEND_FLOW=246, PETRI_DIFFERENCE_MINUEND_PLACES=50, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=39, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=10, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=29, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=258, PETRI_PLACES=56, PETRI_TRANSITIONS=38} [2023-11-12 02:32:04,513 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, 33 predicate places. [2023-11-12 02:32:04,514 INFO L495 AbstractCegarLoop]: Abstraction has has 56 places, 38 transitions, 258 flow [2023-11-12 02:32:04,514 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 137.125) internal successors, (1097), 8 states have internal predecessors, (1097), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:04,514 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:32:04,514 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:32:04,531 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-12 02:32:04,725 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 02:32:04,725 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-12 02:32:04,725 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:32:04,725 INFO L85 PathProgramCache]: Analyzing trace with hash 313667840, now seen corresponding path program 4 times [2023-11-12 02:32:04,725 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:32:04,726 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [958283869] [2023-11-12 02:32:04,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:32:04,726 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:32:04,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:32:05,366 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 02:32:05,367 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:32:05,367 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [958283869] [2023-11-12 02:32:05,367 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [958283869] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 02:32:05,367 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 02:32:05,368 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-12 02:32:05,368 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1680983805] [2023-11-12 02:32:05,368 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 02:32:05,368 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-12 02:32:05,369 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:32:05,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-12 02:32:05,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2023-11-12 02:32:05,763 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 141 out of 353 [2023-11-12 02:32:05,765 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 56 places, 38 transitions, 258 flow. Second operand has 8 states, 8 states have (on average 143.125) internal successors, (1145), 8 states have internal predecessors, (1145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:05,765 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:32:05,765 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 141 of 353 [2023-11-12 02:32:05,765 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:32:05,946 INFO L124 PetriNetUnfolderBase]: 129/255 cut-off events. [2023-11-12 02:32:05,946 INFO L125 PetriNetUnfolderBase]: For 607/609 co-relation queries the response was YES. [2023-11-12 02:32:05,947 INFO L83 FinitePrefix]: Finished finitePrefix Result has 986 conditions, 255 events. 129/255 cut-off events. For 607/609 co-relation queries the response was YES. Maximal size of possible extension queue 23. Compared 935 event pairs, 45 based on Foata normal form. 4/257 useless extension candidates. Maximal degree in co-relation 952. Up to 216 conditions per place. [2023-11-12 02:32:05,950 INFO L140 encePairwiseOnDemand]: 347/353 looper letters, 30 selfloop transitions, 8 changer transitions 6/46 dead transitions. [2023-11-12 02:32:05,950 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 59 places, 46 transitions, 366 flow [2023-11-12 02:32:05,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 02:32:05,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-11-12 02:32:05,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 882 transitions. [2023-11-12 02:32:05,954 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4164305949008499 [2023-11-12 02:32:05,954 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 882 transitions. [2023-11-12 02:32:05,955 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 882 transitions. [2023-11-12 02:32:05,956 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:32:05,956 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 882 transitions. [2023-11-12 02:32:05,958 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 147.0) internal successors, (882), 6 states have internal predecessors, (882), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:05,962 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 353.0) internal successors, (2471), 7 states have internal predecessors, (2471), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:05,963 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 353.0) internal successors, (2471), 7 states have internal predecessors, (2471), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:05,963 INFO L175 Difference]: Start difference. First operand has 56 places, 38 transitions, 258 flow. Second operand 6 states and 882 transitions. [2023-11-12 02:32:05,963 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 59 places, 46 transitions, 366 flow [2023-11-12 02:32:05,966 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 51 places, 46 transitions, 331 flow, removed 2 selfloop flow, removed 8 redundant places. [2023-11-12 02:32:05,967 INFO L231 Difference]: Finished difference. Result has 51 places, 36 transitions, 226 flow [2023-11-12 02:32:05,968 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=353, PETRI_DIFFERENCE_MINUEND_FLOW=223, PETRI_DIFFERENCE_MINUEND_PLACES=46, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=38, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=8, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=30, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=226, PETRI_PLACES=51, PETRI_TRANSITIONS=36} [2023-11-12 02:32:05,968 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, 28 predicate places. [2023-11-12 02:32:05,969 INFO L495 AbstractCegarLoop]: Abstraction has has 51 places, 36 transitions, 226 flow [2023-11-12 02:32:05,969 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 143.125) internal successors, (1145), 8 states have internal predecessors, (1145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:05,969 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:32:05,969 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:32:05,970 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-11-12 02:32:05,970 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-12 02:32:05,970 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:32:05,970 INFO L85 PathProgramCache]: Analyzing trace with hash 234593243, now seen corresponding path program 5 times [2023-11-12 02:32:05,971 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:32:05,971 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [443784495] [2023-11-12 02:32:05,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:32:05,971 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:32:06,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:32:06,799 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 02:32:06,799 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:32:06,799 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [443784495] [2023-11-12 02:32:06,799 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [443784495] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 02:32:06,799 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [467152979] [2023-11-12 02:32:06,799 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2023-11-12 02:32:06,800 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 02:32:06,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 [2023-11-12 02:32:06,801 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 02:32:06,812 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-12 02:32:06,921 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-12 02:32:06,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 02:32:06,923 INFO L262 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 32 conjunts are in the unsatisfiable core [2023-11-12 02:32:06,926 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 02:32:06,936 INFO L351 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 42 treesize of output 38 [2023-11-12 02:32:07,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 02:32:07,347 INFO L322 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-11-12 02:32:07,348 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 18 [2023-11-12 02:32:07,432 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 02:32:07,433 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 02:32:07,740 INFO L322 Elim1Store]: treesize reduction 11, result has 85.7 percent of original size [2023-11-12 02:32:07,740 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 130 treesize of output 147 [2023-11-12 02:32:07,765 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-12 02:32:07,765 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 62 [2023-11-12 02:32:08,250 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 02:32:08,250 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [467152979] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 02:32:08,251 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 02:32:08,251 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 21 [2023-11-12 02:32:08,251 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930229998] [2023-11-12 02:32:08,251 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 02:32:08,251 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-12 02:32:08,252 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:32:08,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-12 02:32:08,253 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=388, Unknown=2, NotChecked=0, Total=462 [2023-11-12 02:32:10,656 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 92 out of 353 [2023-11-12 02:32:10,659 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 51 places, 36 transitions, 226 flow. Second operand has 22 states, 22 states have (on average 93.86363636363636) internal successors, (2065), 22 states have internal predecessors, (2065), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:10,659 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:32:10,659 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 92 of 353 [2023-11-12 02:32:10,659 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:32:11,213 INFO L124 PetriNetUnfolderBase]: 111/209 cut-off events. [2023-11-12 02:32:11,213 INFO L125 PetriNetUnfolderBase]: For 411/413 co-relation queries the response was YES. [2023-11-12 02:32:11,214 INFO L83 FinitePrefix]: Finished finitePrefix Result has 814 conditions, 209 events. 111/209 cut-off events. For 411/413 co-relation queries the response was YES. Maximal size of possible extension queue 19. Compared 659 event pairs, 11 based on Foata normal form. 12/219 useless extension candidates. Maximal degree in co-relation 783. Up to 121 conditions per place. [2023-11-12 02:32:11,216 INFO L140 encePairwiseOnDemand]: 344/353 looper letters, 32 selfloop transitions, 13 changer transitions 0/47 dead transitions. [2023-11-12 02:32:11,216 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 57 places, 47 transitions, 355 flow [2023-11-12 02:32:11,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-12 02:32:11,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2023-11-12 02:32:11,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 868 transitions. [2023-11-12 02:32:11,220 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.2732137236386528 [2023-11-12 02:32:11,220 INFO L72 ComplementDD]: Start complementDD. Operand 9 states and 868 transitions. [2023-11-12 02:32:11,221 INFO L73 IsDeterministic]: Start isDeterministic. Operand 9 states and 868 transitions. [2023-11-12 02:32:11,221 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:32:11,222 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 9 states and 868 transitions. [2023-11-12 02:32:11,224 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 10 states, 9 states have (on average 96.44444444444444) internal successors, (868), 9 states have internal predecessors, (868), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:11,228 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 10 states, 10 states have (on average 353.0) internal successors, (3530), 10 states have internal predecessors, (3530), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:11,229 INFO L81 ComplementDD]: Finished complementDD. Result has 10 states, 10 states have (on average 353.0) internal successors, (3530), 10 states have internal predecessors, (3530), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:11,230 INFO L175 Difference]: Start difference. First operand has 51 places, 36 transitions, 226 flow. Second operand 9 states and 868 transitions. [2023-11-12 02:32:11,230 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 57 places, 47 transitions, 355 flow [2023-11-12 02:32:11,232 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 52 places, 47 transitions, 337 flow, removed 1 selfloop flow, removed 5 redundant places. [2023-11-12 02:32:11,233 INFO L231 Difference]: Finished difference. Result has 53 places, 36 transitions, 240 flow [2023-11-12 02:32:11,234 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=353, PETRI_DIFFERENCE_MINUEND_FLOW=208, PETRI_DIFFERENCE_MINUEND_PLACES=44, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=36, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=13, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=23, PETRI_DIFFERENCE_SUBTRAHEND_STATES=9, PETRI_FLOW=240, PETRI_PLACES=53, PETRI_TRANSITIONS=36} [2023-11-12 02:32:11,234 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, 30 predicate places. [2023-11-12 02:32:11,235 INFO L495 AbstractCegarLoop]: Abstraction has has 53 places, 36 transitions, 240 flow [2023-11-12 02:32:11,235 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 93.86363636363636) internal successors, (2065), 22 states have internal predecessors, (2065), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:11,236 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:32:11,236 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:32:11,242 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-12 02:32:11,442 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-11-12 02:32:11,443 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-12 02:32:11,443 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:32:11,443 INFO L85 PathProgramCache]: Analyzing trace with hash 603232998, now seen corresponding path program 1 times [2023-11-12 02:32:11,443 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:32:11,444 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [444709238] [2023-11-12 02:32:11,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:32:11,444 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:32:11,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:32:11,565 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 02:32:11,566 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:32:11,566 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [444709238] [2023-11-12 02:32:11,566 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [444709238] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 02:32:11,566 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [222096234] [2023-11-12 02:32:11,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:32:11,567 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 02:32:11,567 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 [2023-11-12 02:32:11,568 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 02:32:11,592 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-12 02:32:11,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:32:11,690 INFO L262 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-12 02:32:11,692 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 02:32:11,777 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 02:32:11,778 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 02:32:11,819 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 02:32:11,820 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [222096234] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 02:32:11,820 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 02:32:11,820 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 2] total 5 [2023-11-12 02:32:11,820 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345417052] [2023-11-12 02:32:11,820 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 02:32:11,821 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 02:32:11,821 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:32:11,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 02:32:11,822 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2023-11-12 02:32:11,928 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 160 out of 353 [2023-11-12 02:32:11,929 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 53 places, 36 transitions, 240 flow. Second operand has 7 states, 7 states have (on average 165.28571428571428) internal successors, (1157), 7 states have internal predecessors, (1157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:11,929 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:32:11,929 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 160 of 353 [2023-11-12 02:32:11,930 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:32:12,126 INFO L124 PetriNetUnfolderBase]: 251/462 cut-off events. [2023-11-12 02:32:12,126 INFO L125 PetriNetUnfolderBase]: For 1043/1045 co-relation queries the response was YES. [2023-11-12 02:32:12,128 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1836 conditions, 462 events. 251/462 cut-off events. For 1043/1045 co-relation queries the response was YES. Maximal size of possible extension queue 30. Compared 1802 event pairs, 19 based on Foata normal form. 4/463 useless extension candidates. Maximal degree in co-relation 1803. Up to 212 conditions per place. [2023-11-12 02:32:12,132 INFO L140 encePairwiseOnDemand]: 349/353 looper letters, 61 selfloop transitions, 15 changer transitions 2/80 dead transitions. [2023-11-12 02:32:12,132 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 59 places, 80 transitions, 599 flow [2023-11-12 02:32:12,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-12 02:32:12,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-11-12 02:32:12,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1188 transitions. [2023-11-12 02:32:12,151 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.480777013354917 [2023-11-12 02:32:12,152 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1188 transitions. [2023-11-12 02:32:12,152 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1188 transitions. [2023-11-12 02:32:12,153 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:32:12,154 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1188 transitions. [2023-11-12 02:32:12,158 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 169.71428571428572) internal successors, (1188), 7 states have internal predecessors, (1188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:12,164 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 353.0) internal successors, (2824), 8 states have internal predecessors, (2824), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:12,165 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 353.0) internal successors, (2824), 8 states have internal predecessors, (2824), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:12,165 INFO L175 Difference]: Start difference. First operand has 53 places, 36 transitions, 240 flow. Second operand 7 states and 1188 transitions. [2023-11-12 02:32:12,165 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 59 places, 80 transitions, 599 flow [2023-11-12 02:32:12,171 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 51 places, 80 transitions, 557 flow, removed 4 selfloop flow, removed 8 redundant places. [2023-11-12 02:32:12,173 INFO L231 Difference]: Finished difference. Result has 54 places, 45 transitions, 322 flow [2023-11-12 02:32:12,174 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=353, PETRI_DIFFERENCE_MINUEND_FLOW=208, PETRI_DIFFERENCE_MINUEND_PLACES=45, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=36, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=8, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=26, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=322, PETRI_PLACES=54, PETRI_TRANSITIONS=45} [2023-11-12 02:32:12,174 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, 31 predicate places. [2023-11-12 02:32:12,174 INFO L495 AbstractCegarLoop]: Abstraction has has 54 places, 45 transitions, 322 flow [2023-11-12 02:32:12,175 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 165.28571428571428) internal successors, (1157), 7 states have internal predecessors, (1157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:12,175 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:32:12,175 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:32:12,185 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-12 02:32:12,381 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-11-12 02:32:12,381 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-12 02:32:12,382 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:32:12,382 INFO L85 PathProgramCache]: Analyzing trace with hash -1632326098, now seen corresponding path program 2 times [2023-11-12 02:32:12,382 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:32:12,382 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [543982721] [2023-11-12 02:32:12,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:32:12,382 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:32:12,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:32:12,510 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 02:32:12,510 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:32:12,510 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [543982721] [2023-11-12 02:32:12,510 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [543982721] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 02:32:12,511 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1911200172] [2023-11-12 02:32:12,511 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-12 02:32:12,511 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 02:32:12,511 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 [2023-11-12 02:32:12,512 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 02:32:12,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-12 02:32:12,635 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-12 02:32:12,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 02:32:12,637 INFO L262 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-12 02:32:12,638 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 02:32:12,704 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 02:32:12,704 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 02:32:12,736 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-12 02:32:12,736 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1911200172] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 02:32:12,737 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 02:32:12,737 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 2] total 5 [2023-11-12 02:32:12,737 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115740066] [2023-11-12 02:32:12,737 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 02:32:12,737 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 02:32:12,738 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:32:12,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 02:32:12,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2023-11-12 02:32:12,824 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 160 out of 353 [2023-11-12 02:32:12,826 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 54 places, 45 transitions, 322 flow. Second operand has 7 states, 7 states have (on average 165.28571428571428) internal successors, (1157), 7 states have internal predecessors, (1157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:12,826 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:32:12,826 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 160 of 353 [2023-11-12 02:32:12,826 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:32:13,032 INFO L124 PetriNetUnfolderBase]: 365/668 cut-off events. [2023-11-12 02:32:13,032 INFO L125 PetriNetUnfolderBase]: For 1511/1513 co-relation queries the response was YES. [2023-11-12 02:32:13,035 INFO L83 FinitePrefix]: Finished finitePrefix Result has 2695 conditions, 668 events. 365/668 cut-off events. For 1511/1513 co-relation queries the response was YES. Maximal size of possible extension queue 42. Compared 2946 event pairs, 83 based on Foata normal form. 4/669 useless extension candidates. Maximal degree in co-relation 2662. Up to 460 conditions per place. [2023-11-12 02:32:13,040 INFO L140 encePairwiseOnDemand]: 349/353 looper letters, 65 selfloop transitions, 15 changer transitions 2/84 dead transitions. [2023-11-12 02:32:13,041 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 60 places, 84 transitions, 679 flow [2023-11-12 02:32:13,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-12 02:32:13,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-11-12 02:32:13,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1183 transitions. [2023-11-12 02:32:13,043 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.47875354107648727 [2023-11-12 02:32:13,044 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1183 transitions. [2023-11-12 02:32:13,044 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1183 transitions. [2023-11-12 02:32:13,044 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:32:13,044 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1183 transitions. [2023-11-12 02:32:13,047 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 169.0) internal successors, (1183), 7 states have internal predecessors, (1183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:13,051 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 353.0) internal successors, (2824), 8 states have internal predecessors, (2824), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:13,052 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 353.0) internal successors, (2824), 8 states have internal predecessors, (2824), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:13,052 INFO L175 Difference]: Start difference. First operand has 54 places, 45 transitions, 322 flow. Second operand 7 states and 1183 transitions. [2023-11-12 02:32:13,052 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 60 places, 84 transitions, 679 flow [2023-11-12 02:32:13,056 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 59 places, 84 transitions, 649 flow, removed 12 selfloop flow, removed 1 redundant places. [2023-11-12 02:32:13,058 INFO L231 Difference]: Finished difference. Result has 62 places, 54 transitions, 420 flow [2023-11-12 02:32:13,058 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=353, PETRI_DIFFERENCE_MINUEND_FLOW=292, PETRI_DIFFERENCE_MINUEND_PLACES=53, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=45, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=8, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=35, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=420, PETRI_PLACES=62, PETRI_TRANSITIONS=54} [2023-11-12 02:32:13,059 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, 39 predicate places. [2023-11-12 02:32:13,059 INFO L495 AbstractCegarLoop]: Abstraction has has 62 places, 54 transitions, 420 flow [2023-11-12 02:32:13,060 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 165.28571428571428) internal successors, (1157), 7 states have internal predecessors, (1157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:13,060 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:32:13,060 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:32:13,072 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-12 02:32:13,267 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-11-12 02:32:13,267 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-12 02:32:13,268 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:32:13,268 INFO L85 PathProgramCache]: Analyzing trace with hash -1984551997, now seen corresponding path program 3 times [2023-11-12 02:32:13,268 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:32:13,268 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1674927025] [2023-11-12 02:32:13,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:32:13,268 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:32:13,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:32:13,416 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 02:32:13,416 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:32:13,417 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1674927025] [2023-11-12 02:32:13,417 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1674927025] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 02:32:13,417 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2026826399] [2023-11-12 02:32:13,417 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 02:32:13,417 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 02:32:13,418 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 [2023-11-12 02:32:13,419 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 02:32:13,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-12 02:32:13,541 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-12 02:32:13,542 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 02:32:13,544 INFO L262 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-12 02:32:13,545 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 02:32:13,645 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 02:32:13,646 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 02:32:13,723 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 02:32:13,723 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2026826399] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 02:32:13,723 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 02:32:13,724 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 14 [2023-11-12 02:32:13,724 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989213502] [2023-11-12 02:32:13,724 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 02:32:13,724 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-12 02:32:13,725 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:32:13,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-12 02:32:13,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=144, Unknown=0, NotChecked=0, Total=210 [2023-11-12 02:32:14,180 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 143 out of 353 [2023-11-12 02:32:14,183 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 62 places, 54 transitions, 420 flow. Second operand has 15 states, 15 states have (on average 146.0) internal successors, (2190), 15 states have internal predecessors, (2190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:14,183 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:32:14,183 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 143 of 353 [2023-11-12 02:32:14,183 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:32:14,487 INFO L124 PetriNetUnfolderBase]: 560/1074 cut-off events. [2023-11-12 02:32:14,488 INFO L125 PetriNetUnfolderBase]: For 2882/2884 co-relation queries the response was YES. [2023-11-12 02:32:14,493 INFO L83 FinitePrefix]: Finished finitePrefix Result has 4377 conditions, 1074 events. 560/1074 cut-off events. For 2882/2884 co-relation queries the response was YES. Maximal size of possible extension queue 70. Compared 5638 event pairs, 186 based on Foata normal form. 54/1124 useless extension candidates. Maximal degree in co-relation 4340. Up to 526 conditions per place. [2023-11-12 02:32:14,503 INFO L140 encePairwiseOnDemand]: 348/353 looper letters, 81 selfloop transitions, 19 changer transitions 0/102 dead transitions. [2023-11-12 02:32:14,503 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 69 places, 102 transitions, 953 flow [2023-11-12 02:32:14,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-12 02:32:14,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2023-11-12 02:32:14,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 1196 transitions. [2023-11-12 02:32:14,509 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4235127478753541 [2023-11-12 02:32:14,509 INFO L72 ComplementDD]: Start complementDD. Operand 8 states and 1196 transitions. [2023-11-12 02:32:14,509 INFO L73 IsDeterministic]: Start isDeterministic. Operand 8 states and 1196 transitions. [2023-11-12 02:32:14,511 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:32:14,511 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 8 states and 1196 transitions. [2023-11-12 02:32:14,517 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 9 states, 8 states have (on average 149.5) internal successors, (1196), 8 states have internal predecessors, (1196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:14,522 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 9 states, 9 states have (on average 353.0) internal successors, (3177), 9 states have internal predecessors, (3177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:14,523 INFO L81 ComplementDD]: Finished complementDD. Result has 9 states, 9 states have (on average 353.0) internal successors, (3177), 9 states have internal predecessors, (3177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:14,523 INFO L175 Difference]: Start difference. First operand has 62 places, 54 transitions, 420 flow. Second operand 8 states and 1196 transitions. [2023-11-12 02:32:14,524 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 69 places, 102 transitions, 953 flow [2023-11-12 02:32:14,531 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 68 places, 102 transitions, 894 flow, removed 24 selfloop flow, removed 1 redundant places. [2023-11-12 02:32:14,533 INFO L231 Difference]: Finished difference. Result has 70 places, 63 transitions, 530 flow [2023-11-12 02:32:14,533 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=353, PETRI_DIFFERENCE_MINUEND_FLOW=374, PETRI_DIFFERENCE_MINUEND_PLACES=61, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=54, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=10, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=42, PETRI_DIFFERENCE_SUBTRAHEND_STATES=8, PETRI_FLOW=530, PETRI_PLACES=70, PETRI_TRANSITIONS=63} [2023-11-12 02:32:14,535 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, 47 predicate places. [2023-11-12 02:32:14,535 INFO L495 AbstractCegarLoop]: Abstraction has has 70 places, 63 transitions, 530 flow [2023-11-12 02:32:14,536 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 146.0) internal successors, (2190), 15 states have internal predecessors, (2190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:14,536 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:32:14,536 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:32:14,543 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-12 02:32:14,743 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-11-12 02:32:14,743 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-12 02:32:14,744 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:32:14,744 INFO L85 PathProgramCache]: Analyzing trace with hash 789353213, now seen corresponding path program 4 times [2023-11-12 02:32:14,744 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:32:14,744 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1035546728] [2023-11-12 02:32:14,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:32:14,744 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:32:14,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:32:14,876 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-12 02:32:14,877 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:32:14,877 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1035546728] [2023-11-12 02:32:14,877 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1035546728] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 02:32:14,877 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1374322495] [2023-11-12 02:32:14,878 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 02:32:14,878 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 02:32:14,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 [2023-11-12 02:32:14,879 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 02:32:14,901 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-12 02:32:15,015 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 02:32:15,016 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 02:32:15,017 INFO L262 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-12 02:32:15,021 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 02:32:15,162 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-12 02:32:15,162 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 02:32:15,384 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-12 02:32:15,384 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1374322495] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 02:32:15,384 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 02:32:15,384 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 14 [2023-11-12 02:32:15,385 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211142472] [2023-11-12 02:32:15,385 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 02:32:15,385 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-12 02:32:15,385 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:32:15,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-12 02:32:15,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2023-11-12 02:32:15,954 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 138 out of 353 [2023-11-12 02:32:15,956 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 70 places, 63 transitions, 530 flow. Second operand has 15 states, 15 states have (on average 141.6) internal successors, (2124), 15 states have internal predecessors, (2124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:15,956 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:32:15,956 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 138 of 353 [2023-11-12 02:32:15,956 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-12 02:32:16,992 INFO L124 PetriNetUnfolderBase]: 995/2021 cut-off events. [2023-11-12 02:32:16,992 INFO L125 PetriNetUnfolderBase]: For 6160/6164 co-relation queries the response was YES. [2023-11-12 02:32:17,001 INFO L83 FinitePrefix]: Finished finitePrefix Result has 8152 conditions, 2021 events. 995/2021 cut-off events. For 6160/6164 co-relation queries the response was YES. Maximal size of possible extension queue 134. Compared 12831 event pairs, 78 based on Foata normal form. 85/2100 useless extension candidates. Maximal degree in co-relation 7743. Up to 483 conditions per place. [2023-11-12 02:32:17,015 INFO L140 encePairwiseOnDemand]: 345/353 looper letters, 144 selfloop transitions, 61 changer transitions 60/267 dead transitions. [2023-11-12 02:32:17,015 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 96 places, 267 transitions, 2256 flow [2023-11-12 02:32:17,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-11-12 02:32:17,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2023-11-12 02:32:17,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 3944 transitions. [2023-11-12 02:32:17,022 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4138075752806631 [2023-11-12 02:32:17,022 INFO L72 ComplementDD]: Start complementDD. Operand 27 states and 3944 transitions. [2023-11-12 02:32:17,023 INFO L73 IsDeterministic]: Start isDeterministic. Operand 27 states and 3944 transitions. [2023-11-12 02:32:17,027 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-12 02:32:17,028 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 27 states and 3944 transitions. [2023-11-12 02:32:17,034 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 28 states, 27 states have (on average 146.07407407407408) internal successors, (3944), 27 states have internal predecessors, (3944), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:17,046 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 28 states, 28 states have (on average 353.0) internal successors, (9884), 28 states have internal predecessors, (9884), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:17,049 INFO L81 ComplementDD]: Finished complementDD. Result has 28 states, 28 states have (on average 353.0) internal successors, (9884), 28 states have internal predecessors, (9884), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:17,049 INFO L175 Difference]: Start difference. First operand has 70 places, 63 transitions, 530 flow. Second operand 27 states and 3944 transitions. [2023-11-12 02:32:17,049 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 96 places, 267 transitions, 2256 flow [2023-11-12 02:32:17,064 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 94 places, 267 transitions, 2239 flow, removed 6 selfloop flow, removed 2 redundant places. [2023-11-12 02:32:17,068 INFO L231 Difference]: Finished difference. Result has 108 places, 96 transitions, 1094 flow [2023-11-12 02:32:17,069 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=353, PETRI_DIFFERENCE_MINUEND_FLOW=521, PETRI_DIFFERENCE_MINUEND_PLACES=68, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=63, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=35, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=24, PETRI_DIFFERENCE_SUBTRAHEND_STATES=27, PETRI_FLOW=1094, PETRI_PLACES=108, PETRI_TRANSITIONS=96} [2023-11-12 02:32:17,069 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, 85 predicate places. [2023-11-12 02:32:17,069 INFO L495 AbstractCegarLoop]: Abstraction has has 108 places, 96 transitions, 1094 flow [2023-11-12 02:32:17,070 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 141.6) internal successors, (2124), 15 states have internal predecessors, (2124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:17,070 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-12 02:32:17,070 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 02:32:17,081 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-12 02:32:17,277 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 02:32:17,278 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-12 02:32:17,278 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 02:32:17,278 INFO L85 PathProgramCache]: Analyzing trace with hash 1305114242, now seen corresponding path program 5 times [2023-11-12 02:32:17,279 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-12 02:32:17,279 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1718423913] [2023-11-12 02:32:17,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 02:32:17,279 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 02:32:17,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 02:32:17,432 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 02:32:17,433 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-12 02:32:17,433 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1718423913] [2023-11-12 02:32:17,433 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1718423913] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 02:32:17,433 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1525099881] [2023-11-12 02:32:17,433 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2023-11-12 02:32:17,433 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 02:32:17,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 [2023-11-12 02:32:17,435 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 02:32:17,455 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_605e10ee-421e-4bee-a867-744fa334e093/bin/uautomizer-verify-uTZkv6EMXl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-12 02:32:17,560 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2023-11-12 02:32:17,560 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 02:32:17,561 INFO L262 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-12 02:32:17,563 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 02:32:17,656 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 02:32:17,656 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 02:32:17,721 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 02:32:17,722 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1525099881] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 02:32:17,722 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 02:32:17,722 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 12 [2023-11-12 02:32:17,722 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164895416] [2023-11-12 02:32:17,722 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 02:32:17,723 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-12 02:32:17,723 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-12 02:32:17,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-12 02:32:17,724 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=104, Unknown=0, NotChecked=0, Total=156 [2023-11-12 02:32:18,000 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 143 out of 353 [2023-11-12 02:32:18,002 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 108 places, 96 transitions, 1094 flow. Second operand has 13 states, 13 states have (on average 146.6153846153846) internal successors, (1906), 13 states have internal predecessors, (1906), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 02:32:18,002 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-12 02:32:18,002 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 143 of 353 [2023-11-12 02:32:18,003 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand