./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/weaver/popl20-more-nonblocking-counter-alt2.wvr.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc 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_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/config/AutomizerReach.xml -i ../../sv-benchmarks/c/weaver/popl20-more-nonblocking-counter-alt2.wvr.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme --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 87e1a1d3acb3ee9b7a4a97eb7b14df31d5b38b7566b1218cea0dabfe5ec8ddbd --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-26 11:57:04,870 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-26 11:57:04,962 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/config/svcomp-Reach-32bit-Automizer_Default.epf [2023-11-26 11:57:04,971 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-26 11:57:04,972 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-26 11:57:05,013 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-26 11:57:05,016 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-26 11:57:05,017 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-26 11:57:05,018 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2023-11-26 11:57:05,023 INFO L153 SettingsManager]: * Use memory slicer=true [2023-11-26 11:57:05,024 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-26 11:57:05,025 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-26 11:57:05,026 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-26 11:57:05,027 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-26 11:57:05,028 INFO L153 SettingsManager]: * Use SBE=true [2023-11-26 11:57:05,029 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-26 11:57:05,029 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-26 11:57:05,030 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-26 11:57:05,030 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-26 11:57:05,031 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-26 11:57:05,031 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-26 11:57:05,032 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-26 11:57:05,032 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-26 11:57:05,033 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-26 11:57:05,033 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-26 11:57:05,034 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-26 11:57:05,034 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-26 11:57:05,035 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-26 11:57:05,035 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-26 11:57:05,036 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-26 11:57:05,037 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-26 11:57:05,038 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2023-11-26 11:57:05,038 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-26 11:57:05,038 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-26 11:57:05,039 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-26 11:57:05,039 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-26 11:57:05,039 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-26 11:57:05,040 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-26 11:57:05,040 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-26 11:57:05,040 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-26 11:57:05,041 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-26 11:57:05,041 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-26 11:57:05,041 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_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 87e1a1d3acb3ee9b7a4a97eb7b14df31d5b38b7566b1218cea0dabfe5ec8ddbd [2023-11-26 11:57:05,293 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-26 11:57:05,324 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-26 11:57:05,327 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-26 11:57:05,328 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-26 11:57:05,329 INFO L274 PluginConnector]: CDTParser initialized [2023-11-26 11:57:05,330 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/../../sv-benchmarks/c/weaver/popl20-more-nonblocking-counter-alt2.wvr.c [2023-11-26 11:57:08,500 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-26 11:57:08,751 INFO L384 CDTParser]: Found 1 translation units. [2023-11-26 11:57:08,751 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/sv-benchmarks/c/weaver/popl20-more-nonblocking-counter-alt2.wvr.c [2023-11-26 11:57:08,766 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/data/bed4bbdda/c1b80bc953074866a0b4d72708ea9ce8/FLAG2e172540d [2023-11-26 11:57:08,781 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/data/bed4bbdda/c1b80bc953074866a0b4d72708ea9ce8 [2023-11-26 11:57:08,787 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-26 11:57:08,790 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-26 11:57:08,797 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-26 11:57:08,797 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-26 11:57:08,803 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-26 11:57:08,806 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 11:57:08" (1/1) ... [2023-11-26 11:57:08,808 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@16e7f202 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:57:08, skipping insertion in model container [2023-11-26 11:57:08,808 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 11:57:08" (1/1) ... [2023-11-26 11:57:08,837 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-26 11:57:09,033 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_f628df5b-e7f9-47c8-a964-f71b55a63778/sv-benchmarks/c/weaver/popl20-more-nonblocking-counter-alt2.wvr.c[2173,2186] [2023-11-26 11:57:09,038 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-26 11:57:09,046 INFO L202 MainTranslator]: Completed pre-run [2023-11-26 11:57:09,067 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_f628df5b-e7f9-47c8-a964-f71b55a63778/sv-benchmarks/c/weaver/popl20-more-nonblocking-counter-alt2.wvr.c[2173,2186] [2023-11-26 11:57:09,068 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-26 11:57:09,076 WARN L675 CHandler]: The function __VERIFIER_atomic_begin is called, but not defined or handled by StandardFunctionHandler. [2023-11-26 11:57:09,076 WARN L675 CHandler]: The function __VERIFIER_atomic_end is called, but not defined or handled by StandardFunctionHandler. [2023-11-26 11:57:09,084 INFO L206 MainTranslator]: Completed translation [2023-11-26 11:57:09,085 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:57:09 WrapperNode [2023-11-26 11:57:09,085 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-26 11:57:09,086 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-26 11:57:09,087 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-26 11:57:09,087 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-26 11:57:09,095 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:57:09" (1/1) ... [2023-11-26 11:57:09,103 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:57:09" (1/1) ... [2023-11-26 11:57:09,122 INFO L138 Inliner]: procedures = 21, calls = 24, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 56 [2023-11-26 11:57:09,123 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-26 11:57:09,123 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-26 11:57:09,123 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-26 11:57:09,123 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-26 11:57:09,134 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:57:09" (1/1) ... [2023-11-26 11:57:09,134 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:57:09" (1/1) ... [2023-11-26 11:57:09,137 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:57:09" (1/1) ... [2023-11-26 11:57:09,152 INFO L175 MemorySlicer]: Split 6 memory accesses to 3 slices as follows [2, 2, 2]. 33 percent of accesses are in the largest equivalence class. The 2 initializations are split as follows [2, 0, 0]. The 2 writes are split as follows [0, 1, 1]. [2023-11-26 11:57:09,153 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:57:09" (1/1) ... [2023-11-26 11:57:09,153 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:57:09" (1/1) ... [2023-11-26 11:57:09,159 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:57:09" (1/1) ... [2023-11-26 11:57:09,163 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:57:09" (1/1) ... [2023-11-26 11:57:09,165 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:57:09" (1/1) ... [2023-11-26 11:57:09,166 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:57:09" (1/1) ... [2023-11-26 11:57:09,169 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-26 11:57:09,170 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-26 11:57:09,171 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-26 11:57:09,171 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-26 11:57:09,172 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:57:09" (1/1) ... [2023-11-26 11:57:09,179 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2023-11-26 11:57:09,195 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 11:57:09,210 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2023-11-26 11:57:09,226 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2023-11-26 11:57:09,257 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-26 11:57:09,258 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2023-11-26 11:57:09,258 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2023-11-26 11:57:09,258 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2023-11-26 11:57:09,258 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2023-11-26 11:57:09,259 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2023-11-26 11:57:09,261 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2023-11-26 11:57:09,261 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#2 [2023-11-26 11:57:09,262 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-26 11:57:09,262 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#0 [2023-11-26 11:57:09,262 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#1 [2023-11-26 11:57:09,262 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#2 [2023-11-26 11:57:09,262 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2023-11-26 11:57:09,262 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2023-11-26 11:57:09,263 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-26 11:57:09,263 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-26 11:57:09,263 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#0 [2023-11-26 11:57:09,263 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#1 [2023-11-26 11:57:09,263 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#2 [2023-11-26 11:57:09,264 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-26 11:57:09,265 WARN L213 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-11-26 11:57:09,373 INFO L241 CfgBuilder]: Building ICFG [2023-11-26 11:57:09,375 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-26 11:57:09,570 INFO L282 CfgBuilder]: Performing block encoding [2023-11-26 11:57:09,808 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-26 11:57:09,809 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-26 11:57:09,809 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 11:57:09 BoogieIcfgContainer [2023-11-26 11:57:09,810 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-26 11:57:09,813 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-26 11:57:09,813 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-26 11:57:09,817 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-26 11:57:09,818 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.11 11:57:08" (1/3) ... [2023-11-26 11:57:09,819 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ebd71cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 11:57:09, skipping insertion in model container [2023-11-26 11:57:09,819 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:57:09" (2/3) ... [2023-11-26 11:57:09,819 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ebd71cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 11:57:09, skipping insertion in model container [2023-11-26 11:57:09,820 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 11:57:09" (3/3) ... [2023-11-26 11:57:09,821 INFO L112 eAbstractionObserver]: Analyzing ICFG popl20-more-nonblocking-counter-alt2.wvr.c [2023-11-26 11:57:09,831 WARN L145 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2023-11-26 11:57:09,842 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-26 11:57:09,843 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-26 11:57:09,843 INFO L514 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-11-26 11:57:09,901 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-11-26 11:57:09,943 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 27 places, 22 transitions, 58 flow [2023-11-26 11:57:09,975 INFO L124 PetriNetUnfolderBase]: 2/20 cut-off events. [2023-11-26 11:57:09,975 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-11-26 11:57:09,978 INFO L83 FinitePrefix]: Finished finitePrefix Result has 29 conditions, 20 events. 2/20 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 19 event pairs, 0 based on Foata normal form. 0/17 useless extension candidates. Maximal degree in co-relation 14. Up to 2 conditions per place. [2023-11-26 11:57:09,978 INFO L82 GeneralOperation]: Start removeDead. Operand has 27 places, 22 transitions, 58 flow [2023-11-26 11:57:09,982 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 24 places, 19 transitions, 50 flow [2023-11-26 11:57:09,994 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-26 11:57:10,001 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;@7148b116, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-26 11:57:10,001 INFO L358 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2023-11-26 11:57:10,020 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-11-26 11:57:10,020 INFO L124 PetriNetUnfolderBase]: 2/18 cut-off events. [2023-11-26 11:57:10,020 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-11-26 11:57:10,021 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 11:57:10,021 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 11:57:10,022 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-26 11:57:10,027 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 11:57:10,028 INFO L85 PathProgramCache]: Analyzing trace with hash -710098005, now seen corresponding path program 1 times [2023-11-26 11:57:10,039 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 11:57:10,040 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [919208564] [2023-11-26 11:57:10,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:57:10,041 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 11:57:10,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 11:57:10,612 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:10,612 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 11:57:10,613 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [919208564] [2023-11-26 11:57:10,614 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [919208564] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-26 11:57:10,614 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-26 11:57:10,614 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-26 11:57:10,617 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100124344] [2023-11-26 11:57:10,618 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-26 11:57:10,627 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-26 11:57:10,636 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 11:57:10,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-26 11:57:10,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-26 11:57:10,680 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 5 out of 22 [2023-11-26 11:57:10,682 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 24 places, 19 transitions, 50 flow. Second operand has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 3 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:10,683 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 11:57:10,683 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 5 of 22 [2023-11-26 11:57:10,684 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 11:57:10,809 INFO L124 PetriNetUnfolderBase]: 79/159 cut-off events. [2023-11-26 11:57:10,809 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-11-26 11:57:10,811 INFO L83 FinitePrefix]: Finished finitePrefix Result has 328 conditions, 159 events. 79/159 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 476 event pairs, 24 based on Foata normal form. 1/159 useless extension candidates. Maximal degree in co-relation 255. Up to 80 conditions per place. [2023-11-26 11:57:10,814 INFO L140 encePairwiseOnDemand]: 19/22 looper letters, 21 selfloop transitions, 2 changer transitions 4/30 dead transitions. [2023-11-26 11:57:10,814 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 26 places, 30 transitions, 135 flow [2023-11-26 11:57:10,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-26 11:57:10,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-26 11:57:10,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 43 transitions. [2023-11-26 11:57:10,828 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6515151515151515 [2023-11-26 11:57:10,829 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 43 transitions. [2023-11-26 11:57:10,830 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 43 transitions. [2023-11-26 11:57:10,831 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 11:57:10,834 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 43 transitions. [2023-11-26 11:57:10,837 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:10,840 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:10,841 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:10,843 INFO L175 Difference]: Start difference. First operand has 24 places, 19 transitions, 50 flow. Second operand 3 states and 43 transitions. [2023-11-26 11:57:10,844 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 26 places, 30 transitions, 135 flow [2023-11-26 11:57:10,847 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 22 places, 30 transitions, 121 flow, removed 0 selfloop flow, removed 4 redundant places. [2023-11-26 11:57:10,850 INFO L231 Difference]: Finished difference. Result has 23 places, 20 transitions, 54 flow [2023-11-26 11:57:10,852 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=22, PETRI_DIFFERENCE_MINUEND_FLOW=42, PETRI_DIFFERENCE_MINUEND_PLACES=20, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=19, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=17, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=54, PETRI_PLACES=23, PETRI_TRANSITIONS=20} [2023-11-26 11:57:10,856 INFO L281 CegarLoopForPetriNet]: 24 programPoint places, -1 predicate places. [2023-11-26 11:57:10,857 INFO L495 AbstractCegarLoop]: Abstraction has has 23 places, 20 transitions, 54 flow [2023-11-26 11:57:10,857 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 3 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:10,857 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 11:57:10,857 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 11:57:10,858 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-26 11:57:10,858 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-26 11:57:10,859 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 11:57:10,859 INFO L85 PathProgramCache]: Analyzing trace with hash 319083287, now seen corresponding path program 1 times [2023-11-26 11:57:10,860 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 11:57:10,860 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1594981943] [2023-11-26 11:57:10,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:57:10,861 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 11:57:10,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 11:57:11,090 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-26 11:57:11,091 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 11:57:11,091 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1594981943] [2023-11-26 11:57:11,091 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1594981943] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-26 11:57:11,091 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-26 11:57:11,092 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-26 11:57:11,092 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024867881] [2023-11-26 11:57:11,092 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-26 11:57:11,094 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-26 11:57:11,095 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 11:57:11,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-26 11:57:11,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-26 11:57:11,108 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 22 [2023-11-26 11:57:11,109 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 23 places, 20 transitions, 54 flow. Second operand has 4 states, 4 states have (on average 7.75) internal successors, (31), 4 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:11,109 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 11:57:11,110 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 22 [2023-11-26 11:57:11,110 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 11:57:11,272 INFO L124 PetriNetUnfolderBase]: 153/282 cut-off events. [2023-11-26 11:57:11,273 INFO L125 PetriNetUnfolderBase]: For 10/10 co-relation queries the response was YES. [2023-11-26 11:57:11,276 INFO L83 FinitePrefix]: Finished finitePrefix Result has 579 conditions, 282 events. 153/282 cut-off events. For 10/10 co-relation queries the response was YES. Maximal size of possible extension queue 22. Compared 962 event pairs, 87 based on Foata normal form. 0/235 useless extension candidates. Maximal degree in co-relation 301. Up to 195 conditions per place. [2023-11-26 11:57:11,280 INFO L140 encePairwiseOnDemand]: 18/22 looper letters, 23 selfloop transitions, 3 changer transitions 0/29 dead transitions. [2023-11-26 11:57:11,280 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 26 places, 29 transitions, 125 flow [2023-11-26 11:57:11,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-26 11:57:11,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-11-26 11:57:11,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 43 transitions. [2023-11-26 11:57:11,283 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.48863636363636365 [2023-11-26 11:57:11,283 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 43 transitions. [2023-11-26 11:57:11,283 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 43 transitions. [2023-11-26 11:57:11,285 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 11:57:11,286 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 43 transitions. [2023-11-26 11:57:11,290 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:11,293 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 22.0) internal successors, (110), 5 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:11,294 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 22.0) internal successors, (110), 5 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:11,294 INFO L175 Difference]: Start difference. First operand has 23 places, 20 transitions, 54 flow. Second operand 4 states and 43 transitions. [2023-11-26 11:57:11,294 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 26 places, 29 transitions, 125 flow [2023-11-26 11:57:11,295 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 25 places, 29 transitions, 123 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-11-26 11:57:11,299 INFO L231 Difference]: Finished difference. Result has 26 places, 21 transitions, 66 flow [2023-11-26 11:57:11,299 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=22, PETRI_DIFFERENCE_MINUEND_FLOW=52, PETRI_DIFFERENCE_MINUEND_PLACES=22, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=20, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=17, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=66, PETRI_PLACES=26, PETRI_TRANSITIONS=21} [2023-11-26 11:57:11,300 INFO L281 CegarLoopForPetriNet]: 24 programPoint places, 2 predicate places. [2023-11-26 11:57:11,305 INFO L495 AbstractCegarLoop]: Abstraction has has 26 places, 21 transitions, 66 flow [2023-11-26 11:57:11,306 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.75) internal successors, (31), 4 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:11,306 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 11:57:11,307 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 11:57:11,307 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-26 11:57:11,308 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-26 11:57:11,311 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 11:57:11,311 INFO L85 PathProgramCache]: Analyzing trace with hash -669572851, now seen corresponding path program 1 times [2023-11-26 11:57:11,311 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 11:57:11,312 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [953928116] [2023-11-26 11:57:11,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:57:11,312 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 11:57:11,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 11:57:11,958 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:11,959 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 11:57:11,960 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [953928116] [2023-11-26 11:57:11,961 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [953928116] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 11:57:11,961 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [553222491] [2023-11-26 11:57:11,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:57:11,962 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:57:11,962 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 11:57:11,965 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 11:57:11,992 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-26 11:57:12,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 11:57:12,067 INFO L262 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-26 11:57:12,074 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 11:57:12,425 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:12,425 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 11:57:12,859 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:12,859 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [553222491] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-26 11:57:12,860 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-26 11:57:12,860 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 15 [2023-11-26 11:57:12,860 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706423592] [2023-11-26 11:57:12,860 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-26 11:57:12,861 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-26 11:57:12,863 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 11:57:12,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-26 11:57:12,866 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=160, Unknown=0, NotChecked=0, Total=240 [2023-11-26 11:57:12,895 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 3 out of 22 [2023-11-26 11:57:12,896 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 26 places, 21 transitions, 66 flow. Second operand has 16 states, 16 states have (on average 5.9375) internal successors, (95), 16 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:12,896 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 11:57:12,896 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 3 of 22 [2023-11-26 11:57:12,896 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 11:57:13,826 INFO L124 PetriNetUnfolderBase]: 619/1075 cut-off events. [2023-11-26 11:57:13,826 INFO L125 PetriNetUnfolderBase]: For 254/254 co-relation queries the response was YES. [2023-11-26 11:57:13,829 INFO L83 FinitePrefix]: Finished finitePrefix Result has 2623 conditions, 1075 events. 619/1075 cut-off events. For 254/254 co-relation queries the response was YES. Maximal size of possible extension queue 57. Compared 4668 event pairs, 32 based on Foata normal form. 2/997 useless extension candidates. Maximal degree in co-relation 879. Up to 269 conditions per place. [2023-11-26 11:57:13,837 INFO L140 encePairwiseOnDemand]: 13/22 looper letters, 124 selfloop transitions, 42 changer transitions 17/184 dead transitions. [2023-11-26 11:57:13,837 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 44 places, 184 transitions, 891 flow [2023-11-26 11:57:13,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-11-26 11:57:13,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2023-11-26 11:57:13,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 238 transitions. [2023-11-26 11:57:13,845 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.569377990430622 [2023-11-26 11:57:13,845 INFO L72 ComplementDD]: Start complementDD. Operand 19 states and 238 transitions. [2023-11-26 11:57:13,845 INFO L73 IsDeterministic]: Start isDeterministic. Operand 19 states and 238 transitions. [2023-11-26 11:57:13,848 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 11:57:13,848 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 19 states and 238 transitions. [2023-11-26 11:57:13,850 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 20 states, 19 states have (on average 12.526315789473685) internal successors, (238), 19 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:13,852 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 20 states, 20 states have (on average 22.0) internal successors, (440), 20 states have internal predecessors, (440), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:13,853 INFO L81 ComplementDD]: Finished complementDD. Result has 20 states, 20 states have (on average 22.0) internal successors, (440), 20 states have internal predecessors, (440), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:13,857 INFO L175 Difference]: Start difference. First operand has 26 places, 21 transitions, 66 flow. Second operand 19 states and 238 transitions. [2023-11-26 11:57:13,858 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 44 places, 184 transitions, 891 flow [2023-11-26 11:57:13,864 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 42 places, 184 transitions, 867 flow, removed 5 selfloop flow, removed 2 redundant places. [2023-11-26 11:57:13,869 INFO L231 Difference]: Finished difference. Result has 53 places, 66 transitions, 414 flow [2023-11-26 11:57:13,869 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=22, PETRI_DIFFERENCE_MINUEND_FLOW=60, PETRI_DIFFERENCE_MINUEND_PLACES=24, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=21, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=7, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=12, PETRI_DIFFERENCE_SUBTRAHEND_STATES=19, PETRI_FLOW=414, PETRI_PLACES=53, PETRI_TRANSITIONS=66} [2023-11-26 11:57:13,872 INFO L281 CegarLoopForPetriNet]: 24 programPoint places, 29 predicate places. [2023-11-26 11:57:13,873 INFO L495 AbstractCegarLoop]: Abstraction has has 53 places, 66 transitions, 414 flow [2023-11-26 11:57:13,874 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 5.9375) internal successors, (95), 16 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:13,874 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 11:57:13,874 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 11:57:13,886 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-26 11:57:14,081 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:57:14,081 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-26 11:57:14,082 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 11:57:14,082 INFO L85 PathProgramCache]: Analyzing trace with hash -427054555, now seen corresponding path program 2 times [2023-11-26 11:57:14,082 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 11:57:14,083 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1442912839] [2023-11-26 11:57:14,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:57:14,083 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 11:57:14,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 11:57:14,308 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:14,309 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 11:57:14,309 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1442912839] [2023-11-26 11:57:14,309 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1442912839] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 11:57:14,309 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2074226283] [2023-11-26 11:57:14,310 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-26 11:57:14,310 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:57:14,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 11:57:14,311 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 11:57:14,341 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-26 11:57:14,408 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-26 11:57:14,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-26 11:57:14,409 INFO L262 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-26 11:57:14,413 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 11:57:14,516 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:14,516 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 11:57:14,811 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:14,812 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2074226283] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-26 11:57:14,812 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-26 11:57:14,812 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5, 6] total 10 [2023-11-26 11:57:14,812 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302269524] [2023-11-26 11:57:14,813 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-26 11:57:14,813 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-26 11:57:14,813 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 11:57:14,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-26 11:57:14,815 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2023-11-26 11:57:14,822 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 3 out of 22 [2023-11-26 11:57:14,822 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 53 places, 66 transitions, 414 flow. Second operand has 11 states, 11 states have (on average 5.818181818181818) internal successors, (64), 11 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:14,822 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 11:57:14,822 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 3 of 22 [2023-11-26 11:57:14,823 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 11:57:15,236 INFO L124 PetriNetUnfolderBase]: 684/1194 cut-off events. [2023-11-26 11:57:15,236 INFO L125 PetriNetUnfolderBase]: For 2351/2351 co-relation queries the response was YES. [2023-11-26 11:57:15,240 INFO L83 FinitePrefix]: Finished finitePrefix Result has 4153 conditions, 1194 events. 684/1194 cut-off events. For 2351/2351 co-relation queries the response was YES. Maximal size of possible extension queue 59. Compared 5325 event pairs, 104 based on Foata normal form. 26/1220 useless extension candidates. Maximal degree in co-relation 3891. Up to 615 conditions per place. [2023-11-26 11:57:15,249 INFO L140 encePairwiseOnDemand]: 15/22 looper letters, 72 selfloop transitions, 33 changer transitions 0/106 dead transitions. [2023-11-26 11:57:15,249 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 60 places, 106 transitions, 815 flow [2023-11-26 11:57:15,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-26 11:57:15,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2023-11-26 11:57:15,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 80 transitions. [2023-11-26 11:57:15,257 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.45454545454545453 [2023-11-26 11:57:15,257 INFO L72 ComplementDD]: Start complementDD. Operand 8 states and 80 transitions. [2023-11-26 11:57:15,257 INFO L73 IsDeterministic]: Start isDeterministic. Operand 8 states and 80 transitions. [2023-11-26 11:57:15,257 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 11:57:15,258 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 8 states and 80 transitions. [2023-11-26 11:57:15,259 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 9 states, 8 states have (on average 10.0) internal successors, (80), 8 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:15,260 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 9 states, 9 states have (on average 22.0) internal successors, (198), 9 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:15,260 INFO L81 ComplementDD]: Finished complementDD. Result has 9 states, 9 states have (on average 22.0) internal successors, (198), 9 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:15,260 INFO L175 Difference]: Start difference. First operand has 53 places, 66 transitions, 414 flow. Second operand 8 states and 80 transitions. [2023-11-26 11:57:15,262 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 60 places, 106 transitions, 815 flow [2023-11-26 11:57:15,276 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 59 places, 106 transitions, 750 flow, removed 31 selfloop flow, removed 1 redundant places. [2023-11-26 11:57:15,279 INFO L231 Difference]: Finished difference. Result has 63 places, 72 transitions, 532 flow [2023-11-26 11:57:15,279 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=22, PETRI_DIFFERENCE_MINUEND_FLOW=371, PETRI_DIFFERENCE_MINUEND_PLACES=52, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=66, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=27, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=37, PETRI_DIFFERENCE_SUBTRAHEND_STATES=8, PETRI_FLOW=532, PETRI_PLACES=63, PETRI_TRANSITIONS=72} [2023-11-26 11:57:15,280 INFO L281 CegarLoopForPetriNet]: 24 programPoint places, 39 predicate places. [2023-11-26 11:57:15,280 INFO L495 AbstractCegarLoop]: Abstraction has has 63 places, 72 transitions, 532 flow [2023-11-26 11:57:15,281 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 5.818181818181818) internal successors, (64), 11 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:15,281 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 11:57:15,281 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 11:57:15,293 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-26 11:57:15,486 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:57:15,487 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-26 11:57:15,487 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 11:57:15,487 INFO L85 PathProgramCache]: Analyzing trace with hash 174217317, now seen corresponding path program 3 times [2023-11-26 11:57:15,487 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 11:57:15,487 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1895710843] [2023-11-26 11:57:15,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:57:15,488 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 11:57:15,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 11:57:15,751 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:15,751 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 11:57:15,752 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1895710843] [2023-11-26 11:57:15,752 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1895710843] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 11:57:15,752 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1892210014] [2023-11-26 11:57:15,752 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-26 11:57:15,752 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:57:15,752 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 11:57:15,754 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 11:57:15,779 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-26 11:57:15,850 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-26 11:57:15,850 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-26 11:57:15,852 INFO L262 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-26 11:57:15,853 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 11:57:15,978 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:15,978 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 11:57:16,186 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:16,187 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1892210014] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-26 11:57:16,187 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-26 11:57:16,187 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 7] total 16 [2023-11-26 11:57:16,187 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583748197] [2023-11-26 11:57:16,187 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-26 11:57:16,188 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-26 11:57:16,188 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 11:57:16,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-26 11:57:16,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=171, Unknown=0, NotChecked=0, Total=240 [2023-11-26 11:57:16,204 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 22 [2023-11-26 11:57:16,204 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 63 places, 72 transitions, 532 flow. Second operand has 16 states, 16 states have (on average 6.125) internal successors, (98), 16 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:16,204 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 11:57:16,204 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 22 [2023-11-26 11:57:16,204 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 11:57:17,227 INFO L124 PetriNetUnfolderBase]: 1115/1958 cut-off events. [2023-11-26 11:57:17,227 INFO L125 PetriNetUnfolderBase]: For 6629/6631 co-relation queries the response was YES. [2023-11-26 11:57:17,237 INFO L83 FinitePrefix]: Finished finitePrefix Result has 7396 conditions, 1958 events. 1115/1958 cut-off events. For 6629/6631 co-relation queries the response was YES. Maximal size of possible extension queue 97. Compared 10165 event pairs, 22 based on Foata normal form. 30/1988 useless extension candidates. Maximal degree in co-relation 7076. Up to 408 conditions per place. [2023-11-26 11:57:17,252 INFO L140 encePairwiseOnDemand]: 14/22 looper letters, 102 selfloop transitions, 135 changer transitions 22/277 dead transitions. [2023-11-26 11:57:17,253 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 82 places, 277 transitions, 2528 flow [2023-11-26 11:57:17,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-11-26 11:57:17,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2023-11-26 11:57:17,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 216 transitions. [2023-11-26 11:57:17,256 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4909090909090909 [2023-11-26 11:57:17,257 INFO L72 ComplementDD]: Start complementDD. Operand 20 states and 216 transitions. [2023-11-26 11:57:17,257 INFO L73 IsDeterministic]: Start isDeterministic. Operand 20 states and 216 transitions. [2023-11-26 11:57:17,257 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 11:57:17,257 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 20 states and 216 transitions. [2023-11-26 11:57:17,258 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 21 states, 20 states have (on average 10.8) internal successors, (216), 20 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:17,260 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 21 states, 21 states have (on average 22.0) internal successors, (462), 21 states have internal predecessors, (462), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:17,260 INFO L81 ComplementDD]: Finished complementDD. Result has 21 states, 21 states have (on average 22.0) internal successors, (462), 21 states have internal predecessors, (462), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:17,260 INFO L175 Difference]: Start difference. First operand has 63 places, 72 transitions, 532 flow. Second operand 20 states and 216 transitions. [2023-11-26 11:57:17,260 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 82 places, 277 transitions, 2528 flow [2023-11-26 11:57:17,312 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 79 places, 277 transitions, 2508 flow, removed 4 selfloop flow, removed 3 redundant places. [2023-11-26 11:57:17,320 INFO L231 Difference]: Finished difference. Result has 92 places, 179 transitions, 1950 flow [2023-11-26 11:57:17,321 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=22, PETRI_DIFFERENCE_MINUEND_FLOW=521, PETRI_DIFFERENCE_MINUEND_PLACES=60, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=72, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=33, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=31, PETRI_DIFFERENCE_SUBTRAHEND_STATES=20, PETRI_FLOW=1950, PETRI_PLACES=92, PETRI_TRANSITIONS=179} [2023-11-26 11:57:17,324 INFO L281 CegarLoopForPetriNet]: 24 programPoint places, 68 predicate places. [2023-11-26 11:57:17,324 INFO L495 AbstractCegarLoop]: Abstraction has has 92 places, 179 transitions, 1950 flow [2023-11-26 11:57:17,324 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 6.125) internal successors, (98), 16 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:17,324 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 11:57:17,325 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 11:57:17,338 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-26 11:57:17,530 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:57:17,534 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-26 11:57:17,535 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 11:57:17,535 INFO L85 PathProgramCache]: Analyzing trace with hash -167213339, now seen corresponding path program 4 times [2023-11-26 11:57:17,535 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 11:57:17,535 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [321001547] [2023-11-26 11:57:17,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:57:17,536 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 11:57:17,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 11:57:17,862 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:17,862 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 11:57:17,863 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [321001547] [2023-11-26 11:57:17,863 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [321001547] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 11:57:17,864 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1417409266] [2023-11-26 11:57:17,864 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-26 11:57:17,864 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:57:17,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 11:57:17,865 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 11:57:17,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-26 11:57:17,955 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-26 11:57:17,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-26 11:57:17,956 INFO L262 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-26 11:57:17,958 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 11:57:18,121 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:18,121 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 11:57:18,426 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:18,427 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1417409266] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-26 11:57:18,427 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-26 11:57:18,427 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 7] total 16 [2023-11-26 11:57:18,427 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404744910] [2023-11-26 11:57:18,428 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-26 11:57:18,428 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-26 11:57:18,429 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 11:57:18,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-26 11:57:18,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2023-11-26 11:57:18,437 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 22 [2023-11-26 11:57:18,438 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 92 places, 179 transitions, 1950 flow. Second operand has 16 states, 16 states have (on average 6.3125) internal successors, (101), 16 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:18,438 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 11:57:18,438 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 22 [2023-11-26 11:57:18,438 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 11:57:19,653 INFO L124 PetriNetUnfolderBase]: 1531/2666 cut-off events. [2023-11-26 11:57:19,654 INFO L125 PetriNetUnfolderBase]: For 20544/20556 co-relation queries the response was YES. [2023-11-26 11:57:19,673 INFO L83 FinitePrefix]: Finished finitePrefix Result has 13865 conditions, 2666 events. 1531/2666 cut-off events. For 20544/20556 co-relation queries the response was YES. Maximal size of possible extension queue 138. Compared 14731 event pairs, 139 based on Foata normal form. 12/2672 useless extension candidates. Maximal degree in co-relation 12568. Up to 871 conditions per place. [2023-11-26 11:57:19,700 INFO L140 encePairwiseOnDemand]: 13/22 looper letters, 163 selfloop transitions, 242 changer transitions 6/429 dead transitions. [2023-11-26 11:57:19,701 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 109 places, 429 transitions, 5560 flow [2023-11-26 11:57:19,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-11-26 11:57:19,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2023-11-26 11:57:19,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 168 transitions. [2023-11-26 11:57:19,703 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.42424242424242425 [2023-11-26 11:57:19,703 INFO L72 ComplementDD]: Start complementDD. Operand 18 states and 168 transitions. [2023-11-26 11:57:19,703 INFO L73 IsDeterministic]: Start isDeterministic. Operand 18 states and 168 transitions. [2023-11-26 11:57:19,704 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 11:57:19,704 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 18 states and 168 transitions. [2023-11-26 11:57:19,706 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 19 states, 18 states have (on average 9.333333333333334) internal successors, (168), 18 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:19,708 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 19 states, 19 states have (on average 22.0) internal successors, (418), 19 states have internal predecessors, (418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:19,708 INFO L81 ComplementDD]: Finished complementDD. Result has 19 states, 19 states have (on average 22.0) internal successors, (418), 19 states have internal predecessors, (418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:19,709 INFO L175 Difference]: Start difference. First operand has 92 places, 179 transitions, 1950 flow. Second operand 18 states and 168 transitions. [2023-11-26 11:57:19,709 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 109 places, 429 transitions, 5560 flow [2023-11-26 11:57:19,832 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 108 places, 429 transitions, 5361 flow, removed 94 selfloop flow, removed 1 redundant places. [2023-11-26 11:57:19,846 INFO L231 Difference]: Finished difference. Result has 118 places, 341 transitions, 4807 flow [2023-11-26 11:57:19,847 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=22, PETRI_DIFFERENCE_MINUEND_FLOW=1865, PETRI_DIFFERENCE_MINUEND_PLACES=91, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=179, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=91, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=36, PETRI_DIFFERENCE_SUBTRAHEND_STATES=18, PETRI_FLOW=4807, PETRI_PLACES=118, PETRI_TRANSITIONS=341} [2023-11-26 11:57:19,850 INFO L281 CegarLoopForPetriNet]: 24 programPoint places, 94 predicate places. [2023-11-26 11:57:19,851 INFO L495 AbstractCegarLoop]: Abstraction has has 118 places, 341 transitions, 4807 flow [2023-11-26 11:57:19,851 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 6.3125) internal successors, (101), 16 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:19,851 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 11:57:19,851 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 11:57:19,867 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-26 11:57:20,057 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-26 11:57:20,057 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-26 11:57:20,058 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 11:57:20,058 INFO L85 PathProgramCache]: Analyzing trace with hash 920301583, now seen corresponding path program 5 times [2023-11-26 11:57:20,058 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 11:57:20,058 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1663523402] [2023-11-26 11:57:20,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:57:20,059 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 11:57:20,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 11:57:20,366 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:20,366 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 11:57:20,366 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1663523402] [2023-11-26 11:57:20,367 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1663523402] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 11:57:20,367 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [647821931] [2023-11-26 11:57:20,367 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2023-11-26 11:57:20,367 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:57:20,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 11:57:20,368 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 11:57:20,392 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-26 11:57:20,469 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2023-11-26 11:57:20,470 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-26 11:57:20,471 INFO L262 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-26 11:57:20,473 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 11:57:20,687 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:20,687 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 11:57:20,950 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:20,951 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [647821931] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-26 11:57:20,951 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-26 11:57:20,951 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 8] total 17 [2023-11-26 11:57:20,951 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272435991] [2023-11-26 11:57:20,951 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-26 11:57:20,952 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-26 11:57:20,952 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 11:57:20,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-26 11:57:20,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2023-11-26 11:57:20,986 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 3 out of 22 [2023-11-26 11:57:20,986 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 118 places, 341 transitions, 4807 flow. Second operand has 17 states, 17 states have (on average 5.9411764705882355) internal successors, (101), 17 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:20,986 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 11:57:20,986 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 3 of 22 [2023-11-26 11:57:20,986 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 11:57:23,737 INFO L124 PetriNetUnfolderBase]: 2341/3952 cut-off events. [2023-11-26 11:57:23,737 INFO L125 PetriNetUnfolderBase]: For 45204/45204 co-relation queries the response was YES. [2023-11-26 11:57:23,877 INFO L83 FinitePrefix]: Finished finitePrefix Result has 24509 conditions, 3952 events. 2341/3952 cut-off events. For 45204/45204 co-relation queries the response was YES. Maximal size of possible extension queue 198. Compared 22784 event pairs, 50 based on Foata normal form. 64/4016 useless extension candidates. Maximal degree in co-relation 24113. Up to 965 conditions per place. [2023-11-26 11:57:23,939 INFO L140 encePairwiseOnDemand]: 12/22 looper letters, 258 selfloop transitions, 503 changer transitions 1/763 dead transitions. [2023-11-26 11:57:23,939 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 152 places, 763 transitions, 11618 flow [2023-11-26 11:57:23,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2023-11-26 11:57:23,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2023-11-26 11:57:23,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 340 transitions. [2023-11-26 11:57:23,943 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4176904176904177 [2023-11-26 11:57:23,943 INFO L72 ComplementDD]: Start complementDD. Operand 37 states and 340 transitions. [2023-11-26 11:57:23,943 INFO L73 IsDeterministic]: Start isDeterministic. Operand 37 states and 340 transitions. [2023-11-26 11:57:23,944 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 11:57:23,944 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 37 states and 340 transitions. [2023-11-26 11:57:23,947 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 38 states, 37 states have (on average 9.18918918918919) internal successors, (340), 37 states have internal predecessors, (340), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:23,950 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 38 states, 38 states have (on average 22.0) internal successors, (836), 38 states have internal predecessors, (836), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:23,950 INFO L81 ComplementDD]: Finished complementDD. Result has 38 states, 38 states have (on average 22.0) internal successors, (836), 38 states have internal predecessors, (836), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:23,950 INFO L175 Difference]: Start difference. First operand has 118 places, 341 transitions, 4807 flow. Second operand 37 states and 340 transitions. [2023-11-26 11:57:23,951 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 152 places, 763 transitions, 11618 flow [2023-11-26 11:57:24,316 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 150 places, 763 transitions, 11405 flow, removed 106 selfloop flow, removed 2 redundant places. [2023-11-26 11:57:24,340 INFO L231 Difference]: Finished difference. Result has 177 places, 652 transitions, 11117 flow [2023-11-26 11:57:24,341 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=22, PETRI_DIFFERENCE_MINUEND_FLOW=4754, PETRI_DIFFERENCE_MINUEND_PLACES=114, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=341, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=223, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=80, PETRI_DIFFERENCE_SUBTRAHEND_STATES=37, PETRI_FLOW=11117, PETRI_PLACES=177, PETRI_TRANSITIONS=652} [2023-11-26 11:57:24,343 INFO L281 CegarLoopForPetriNet]: 24 programPoint places, 153 predicate places. [2023-11-26 11:57:24,343 INFO L495 AbstractCegarLoop]: Abstraction has has 177 places, 652 transitions, 11117 flow [2023-11-26 11:57:24,344 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 5.9411764705882355) internal successors, (101), 17 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:24,344 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 11:57:24,344 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 11:57:24,360 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-26 11:57:24,550 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-26 11:57:24,551 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-26 11:57:24,551 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 11:57:24,555 INFO L85 PathProgramCache]: Analyzing trace with hash -43415537, now seen corresponding path program 6 times [2023-11-26 11:57:24,555 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 11:57:24,555 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [19159837] [2023-11-26 11:57:24,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:57:24,556 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 11:57:24,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 11:57:24,925 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:24,927 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 11:57:24,928 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [19159837] [2023-11-26 11:57:24,928 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [19159837] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 11:57:24,931 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2113612097] [2023-11-26 11:57:24,931 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2023-11-26 11:57:24,931 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:57:24,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 11:57:24,933 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 11:57:24,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-26 11:57:25,046 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2023-11-26 11:57:25,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-26 11:57:25,048 INFO L262 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-26 11:57:25,050 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 11:57:25,205 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:25,205 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 11:57:25,547 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:25,547 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2113612097] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-26 11:57:25,547 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-26 11:57:25,548 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 7] total 18 [2023-11-26 11:57:25,548 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207427495] [2023-11-26 11:57:25,548 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-26 11:57:25,549 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-26 11:57:25,549 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 11:57:25,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-26 11:57:25,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=225, Unknown=0, NotChecked=0, Total=306 [2023-11-26 11:57:25,552 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 22 [2023-11-26 11:57:25,553 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 177 places, 652 transitions, 11117 flow. Second operand has 18 states, 18 states have (on average 6.0) internal successors, (108), 18 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:25,553 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 11:57:25,553 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 22 [2023-11-26 11:57:25,553 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 11:57:29,689 INFO L124 PetriNetUnfolderBase]: 3164/5529 cut-off events. [2023-11-26 11:57:29,690 INFO L125 PetriNetUnfolderBase]: For 110291/110295 co-relation queries the response was YES. [2023-11-26 11:57:29,757 INFO L83 FinitePrefix]: Finished finitePrefix Result has 41872 conditions, 5529 events. 3164/5529 cut-off events. For 110291/110295 co-relation queries the response was YES. Maximal size of possible extension queue 279. Compared 35397 event pairs, 92 based on Foata normal form. 48/5575 useless extension candidates. Maximal degree in co-relation 41379. Up to 1451 conditions per place. [2023-11-26 11:57:29,818 INFO L140 encePairwiseOnDemand]: 14/22 looper letters, 263 selfloop transitions, 826 changer transitions 2/1123 dead transitions. [2023-11-26 11:57:29,818 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 222 places, 1123 transitions, 20449 flow [2023-11-26 11:57:29,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2023-11-26 11:57:29,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2023-11-26 11:57:29,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 446 transitions. [2023-11-26 11:57:29,823 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4407114624505929 [2023-11-26 11:57:29,823 INFO L72 ComplementDD]: Start complementDD. Operand 46 states and 446 transitions. [2023-11-26 11:57:29,823 INFO L73 IsDeterministic]: Start isDeterministic. Operand 46 states and 446 transitions. [2023-11-26 11:57:29,824 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 11:57:29,824 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 46 states and 446 transitions. [2023-11-26 11:57:29,826 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 47 states, 46 states have (on average 9.695652173913043) internal successors, (446), 46 states have internal predecessors, (446), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:29,830 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 47 states, 47 states have (on average 22.0) internal successors, (1034), 47 states have internal predecessors, (1034), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:29,830 INFO L81 ComplementDD]: Finished complementDD. Result has 47 states, 47 states have (on average 22.0) internal successors, (1034), 47 states have internal predecessors, (1034), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:29,831 INFO L175 Difference]: Start difference. First operand has 177 places, 652 transitions, 11117 flow. Second operand 46 states and 446 transitions. [2023-11-26 11:57:29,831 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 222 places, 1123 transitions, 20449 flow [2023-11-26 11:57:31,077 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 216 places, 1123 transitions, 18795 flow, removed 735 selfloop flow, removed 6 redundant places. [2023-11-26 11:57:31,107 INFO L231 Difference]: Finished difference. Result has 238 places, 999 transitions, 18818 flow [2023-11-26 11:57:31,109 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=22, PETRI_DIFFERENCE_MINUEND_FLOW=10275, PETRI_DIFFERENCE_MINUEND_PLACES=171, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=652, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=508, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=81, PETRI_DIFFERENCE_SUBTRAHEND_STATES=46, PETRI_FLOW=18818, PETRI_PLACES=238, PETRI_TRANSITIONS=999} [2023-11-26 11:57:31,109 INFO L281 CegarLoopForPetriNet]: 24 programPoint places, 214 predicate places. [2023-11-26 11:57:31,110 INFO L495 AbstractCegarLoop]: Abstraction has has 238 places, 999 transitions, 18818 flow [2023-11-26 11:57:31,110 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 6.0) internal successors, (108), 18 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:31,110 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 11:57:31,110 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 11:57:31,124 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-26 11:57:31,316 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:57:31,317 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-26 11:57:31,317 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 11:57:31,317 INFO L85 PathProgramCache]: Analyzing trace with hash -2012909019, now seen corresponding path program 7 times [2023-11-26 11:57:31,318 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 11:57:31,318 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2039265095] [2023-11-26 11:57:31,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:57:31,318 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 11:57:31,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 11:57:31,707 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:31,707 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 11:57:31,707 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2039265095] [2023-11-26 11:57:31,708 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2039265095] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 11:57:31,708 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1842690416] [2023-11-26 11:57:31,708 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-26 11:57:31,708 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:57:31,709 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 11:57:31,713 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 11:57:31,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-26 11:57:31,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 11:57:31,909 INFO L262 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-26 11:57:31,912 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 11:57:32,101 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:32,101 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 11:57:32,493 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:32,493 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1842690416] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-26 11:57:32,494 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-26 11:57:32,494 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 7] total 15 [2023-11-26 11:57:32,494 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [318141978] [2023-11-26 11:57:32,495 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-26 11:57:32,495 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-26 11:57:32,496 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 11:57:32,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-26 11:57:32,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=149, Unknown=0, NotChecked=0, Total=210 [2023-11-26 11:57:32,503 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 22 [2023-11-26 11:57:32,503 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 238 places, 999 transitions, 18818 flow. Second operand has 15 states, 15 states have (on average 6.4) internal successors, (96), 15 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:32,503 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 11:57:32,504 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 22 [2023-11-26 11:57:32,504 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 11:57:37,000 INFO L124 PetriNetUnfolderBase]: 3425/5937 cut-off events. [2023-11-26 11:57:37,001 INFO L125 PetriNetUnfolderBase]: For 133340/133356 co-relation queries the response was YES. [2023-11-26 11:57:37,062 INFO L83 FinitePrefix]: Finished finitePrefix Result has 48453 conditions, 5937 events. 3425/5937 cut-off events. For 133340/133356 co-relation queries the response was YES. Maximal size of possible extension queue 286. Compared 38428 event pairs, 183 based on Foata normal form. 18/5951 useless extension candidates. Maximal degree in co-relation 47384. Up to 1543 conditions per place. [2023-11-26 11:57:37,130 INFO L140 encePairwiseOnDemand]: 13/22 looper letters, 357 selfloop transitions, 764 changer transitions 2/1155 dead transitions. [2023-11-26 11:57:37,131 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 256 places, 1155 transitions, 23789 flow [2023-11-26 11:57:37,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-11-26 11:57:37,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2023-11-26 11:57:37,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 205 transitions. [2023-11-26 11:57:37,133 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.44372294372294374 [2023-11-26 11:57:37,134 INFO L72 ComplementDD]: Start complementDD. Operand 21 states and 205 transitions. [2023-11-26 11:57:37,134 INFO L73 IsDeterministic]: Start isDeterministic. Operand 21 states and 205 transitions. [2023-11-26 11:57:37,134 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 11:57:37,134 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 21 states and 205 transitions. [2023-11-26 11:57:37,136 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 22 states, 21 states have (on average 9.761904761904763) internal successors, (205), 21 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:37,137 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 22 states, 22 states have (on average 22.0) internal successors, (484), 22 states have internal predecessors, (484), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:37,138 INFO L81 ComplementDD]: Finished complementDD. Result has 22 states, 22 states have (on average 22.0) internal successors, (484), 22 states have internal predecessors, (484), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:37,138 INFO L175 Difference]: Start difference. First operand has 238 places, 999 transitions, 18818 flow. Second operand 21 states and 205 transitions. [2023-11-26 11:57:37,138 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 256 places, 1155 transitions, 23789 flow [2023-11-26 11:57:39,747 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 253 places, 1155 transitions, 23456 flow, removed 154 selfloop flow, removed 3 redundant places. [2023-11-26 11:57:39,787 INFO L231 Difference]: Finished difference. Result has 266 places, 1098 transitions, 23560 flow [2023-11-26 11:57:39,788 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=22, PETRI_DIFFERENCE_MINUEND_FLOW=18441, PETRI_DIFFERENCE_MINUEND_PLACES=233, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=994, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=660, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=295, PETRI_DIFFERENCE_SUBTRAHEND_STATES=21, PETRI_FLOW=23560, PETRI_PLACES=266, PETRI_TRANSITIONS=1098} [2023-11-26 11:57:39,789 INFO L281 CegarLoopForPetriNet]: 24 programPoint places, 242 predicate places. [2023-11-26 11:57:39,789 INFO L495 AbstractCegarLoop]: Abstraction has has 266 places, 1098 transitions, 23560 flow [2023-11-26 11:57:39,789 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 6.4) internal successors, (96), 15 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:39,790 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 11:57:39,790 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 11:57:39,796 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-26 11:57:39,992 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:57:39,993 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-26 11:57:39,993 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 11:57:39,994 INFO L85 PathProgramCache]: Analyzing trace with hash 1624932453, now seen corresponding path program 8 times [2023-11-26 11:57:39,994 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 11:57:39,994 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1901770672] [2023-11-26 11:57:39,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:57:39,994 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 11:57:40,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 11:57:40,267 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:40,267 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 11:57:40,268 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1901770672] [2023-11-26 11:57:40,268 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1901770672] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 11:57:40,268 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1557506558] [2023-11-26 11:57:40,268 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-26 11:57:40,269 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:57:40,269 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 11:57:40,273 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 11:57:40,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-26 11:57:40,364 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-26 11:57:40,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-26 11:57:40,365 INFO L262 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-26 11:57:40,367 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 11:57:40,558 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:40,559 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 11:57:40,851 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:40,852 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1557506558] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-26 11:57:40,852 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-26 11:57:40,852 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 7] total 17 [2023-11-26 11:57:40,852 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669163950] [2023-11-26 11:57:40,853 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-26 11:57:40,853 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-26 11:57:40,854 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 11:57:40,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-26 11:57:40,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=194, Unknown=0, NotChecked=0, Total=272 [2023-11-26 11:57:40,864 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 22 [2023-11-26 11:57:40,865 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 266 places, 1098 transitions, 23560 flow. Second operand has 17 states, 17 states have (on average 6.0588235294117645) internal successors, (103), 17 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:40,865 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 11:57:40,865 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 22 [2023-11-26 11:57:40,865 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 11:57:46,261 INFO L124 PetriNetUnfolderBase]: 3982/6945 cut-off events. [2023-11-26 11:57:46,261 INFO L125 PetriNetUnfolderBase]: For 214777/214783 co-relation queries the response was YES. [2023-11-26 11:57:46,382 INFO L83 FinitePrefix]: Finished finitePrefix Result has 63266 conditions, 6945 events. 3982/6945 cut-off events. For 214777/214783 co-relation queries the response was YES. Maximal size of possible extension queue 363. Compared 46832 event pairs, 187 based on Foata normal form. 56/7001 useless extension candidates. Maximal degree in co-relation 61977. Up to 1753 conditions per place. [2023-11-26 11:57:46,474 INFO L140 encePairwiseOnDemand]: 14/22 looper letters, 282 selfloop transitions, 1095 changer transitions 2/1411 dead transitions. [2023-11-26 11:57:46,474 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 287 places, 1411 transitions, 32621 flow [2023-11-26 11:57:46,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-11-26 11:57:46,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2023-11-26 11:57:46,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 236 transitions. [2023-11-26 11:57:46,477 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.466403162055336 [2023-11-26 11:57:46,477 INFO L72 ComplementDD]: Start complementDD. Operand 23 states and 236 transitions. [2023-11-26 11:57:46,478 INFO L73 IsDeterministic]: Start isDeterministic. Operand 23 states and 236 transitions. [2023-11-26 11:57:46,478 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 11:57:46,478 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 23 states and 236 transitions. [2023-11-26 11:57:46,479 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 24 states, 23 states have (on average 10.26086956521739) internal successors, (236), 23 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:46,481 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 24 states, 24 states have (on average 22.0) internal successors, (528), 24 states have internal predecessors, (528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:46,481 INFO L81 ComplementDD]: Finished complementDD. Result has 24 states, 24 states have (on average 22.0) internal successors, (528), 24 states have internal predecessors, (528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:46,481 INFO L175 Difference]: Start difference. First operand has 266 places, 1098 transitions, 23560 flow. Second operand 23 states and 236 transitions. [2023-11-26 11:57:46,482 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 287 places, 1411 transitions, 32621 flow [2023-11-26 11:57:51,142 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 282 places, 1411 transitions, 32267 flow, removed 163 selfloop flow, removed 5 redundant places. [2023-11-26 11:57:51,193 INFO L231 Difference]: Finished difference. Result has 294 places, 1326 transitions, 32968 flow [2023-11-26 11:57:51,194 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=22, PETRI_DIFFERENCE_MINUEND_FLOW=23303, PETRI_DIFFERENCE_MINUEND_PLACES=260, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=1097, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=883, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=155, PETRI_DIFFERENCE_SUBTRAHEND_STATES=23, PETRI_FLOW=32968, PETRI_PLACES=294, PETRI_TRANSITIONS=1326} [2023-11-26 11:57:51,195 INFO L281 CegarLoopForPetriNet]: 24 programPoint places, 270 predicate places. [2023-11-26 11:57:51,195 INFO L495 AbstractCegarLoop]: Abstraction has has 294 places, 1326 transitions, 32968 flow [2023-11-26 11:57:51,195 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 6.0588235294117645) internal successors, (103), 17 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:51,196 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 11:57:51,196 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 11:57:51,203 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-11-26 11:57:51,396 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-26 11:57:51,396 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-26 11:57:51,397 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 11:57:51,397 INFO L85 PathProgramCache]: Analyzing trace with hash -1413551357, now seen corresponding path program 9 times [2023-11-26 11:57:51,397 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 11:57:51,397 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1805235693] [2023-11-26 11:57:51,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:57:51,397 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 11:57:51,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 11:57:51,711 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:51,711 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 11:57:51,711 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1805235693] [2023-11-26 11:57:51,712 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1805235693] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 11:57:51,712 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [732007108] [2023-11-26 11:57:51,712 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-26 11:57:51,712 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:57:51,713 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 11:57:51,714 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 11:57:51,750 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f628df5b-e7f9-47c8-a964-f71b55a63778/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-26 11:57:51,821 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-26 11:57:51,821 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-26 11:57:51,823 INFO L262 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-26 11:57:51,824 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 11:57:51,973 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:51,974 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 11:57:52,185 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:57:52,186 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [732007108] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-26 11:57:52,186 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-26 11:57:52,186 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 8] total 16 [2023-11-26 11:57:52,186 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094657969] [2023-11-26 11:57:52,186 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-26 11:57:52,187 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-26 11:57:52,188 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 11:57:52,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-26 11:57:52,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2023-11-26 11:57:52,215 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 3 out of 22 [2023-11-26 11:57:52,216 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 294 places, 1326 transitions, 32968 flow. Second operand has 16 states, 16 states have (on average 5.75) internal successors, (92), 16 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:57:52,216 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 11:57:52,216 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 3 of 22 [2023-11-26 11:57:52,216 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand