./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/pthread/fib_safe-5.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 527bcce2 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/config/AutomizerReach.xml -i ../../sv-benchmarks/c/pthread/fib_safe-5.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx --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 74a086edb560572752b8cbc391425d974c2cbbd7d3553767e0707a5dc02a4897 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 20:59:12,098 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 20:59:12,224 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/config/svcomp-Reach-32bit-Automizer_Default.epf [2023-11-21 20:59:12,231 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 20:59:12,232 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 20:59:12,272 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 20:59:12,273 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 20:59:12,274 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 20:59:12,275 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2023-11-21 20:59:12,277 INFO L153 SettingsManager]: * Use memory slicer=true [2023-11-21 20:59:12,277 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 20:59:12,285 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 20:59:12,286 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-21 20:59:12,290 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-21 20:59:12,291 INFO L153 SettingsManager]: * Use SBE=true [2023-11-21 20:59:12,291 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 20:59:12,292 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-21 20:59:12,292 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 20:59:12,293 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 20:59:12,293 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 20:59:12,294 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 20:59:12,294 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-21 20:59:12,295 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 20:59:12,295 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-21 20:59:12,295 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 20:59:12,296 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-21 20:59:12,296 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 20:59:12,297 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 20:59:12,298 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-21 20:59:12,298 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 20:59:12,299 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 20:59:12,300 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 20:59:12,300 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 20:59:12,300 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 20:59:12,301 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-21 20:59:12,301 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-21 20:59:12,301 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 20:59:12,301 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 20:59:12,302 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-21 20:59:12,302 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-21 20:59:12,302 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-21 20:59:12,302 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 20:59:12,303 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_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 74a086edb560572752b8cbc391425d974c2cbbd7d3553767e0707a5dc02a4897 [2023-11-21 20:59:12,659 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 20:59:12,688 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 20:59:12,692 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 20:59:12,693 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 20:59:12,694 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 20:59:12,695 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/../../sv-benchmarks/c/pthread/fib_safe-5.i [2023-11-21 20:59:15,844 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 20:59:16,218 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 20:59:16,219 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/sv-benchmarks/c/pthread/fib_safe-5.i [2023-11-21 20:59:16,237 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/data/630f6792c/81e95e908c4046a2837f00c6c89e643e/FLAGd564387cd [2023-11-21 20:59:16,252 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/data/630f6792c/81e95e908c4046a2837f00c6c89e643e [2023-11-21 20:59:16,254 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 20:59:16,256 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 20:59:16,257 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 20:59:16,257 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 20:59:16,262 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 20:59:16,263 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 08:59:16" (1/1) ... [2023-11-21 20:59:16,264 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@700436df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:59:16, skipping insertion in model container [2023-11-21 20:59:16,264 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 08:59:16" (1/1) ... [2023-11-21 20:59:16,312 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 20:59:16,659 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_2cd88f0c-4427-4dc4-8bae-298850754b6f/sv-benchmarks/c/pthread/fib_safe-5.i[30241,30254] [2023-11-21 20:59:16,683 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 20:59:16,695 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 20:59:16,734 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_2cd88f0c-4427-4dc4-8bae-298850754b6f/sv-benchmarks/c/pthread/fib_safe-5.i[30241,30254] [2023-11-21 20:59:16,742 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 20:59:16,783 WARN L675 CHandler]: The function __VERIFIER_atomic_begin is called, but not defined or handled by StandardFunctionHandler. [2023-11-21 20:59:16,784 WARN L675 CHandler]: The function __VERIFIER_atomic_end is called, but not defined or handled by StandardFunctionHandler. [2023-11-21 20:59:16,792 INFO L206 MainTranslator]: Completed translation [2023-11-21 20:59:16,792 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:59:16 WrapperNode [2023-11-21 20:59:16,793 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 20:59:16,794 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 20:59:16,794 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 20:59:16,794 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 20:59:16,802 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:59:16" (1/1) ... [2023-11-21 20:59:16,839 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:59:16" (1/1) ... [2023-11-21 20:59:16,873 INFO L138 Inliner]: procedures = 165, calls = 28, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 74 [2023-11-21 20:59:16,873 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 20:59:16,874 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 20:59:16,874 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 20:59:16,875 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 20:59:16,887 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:59:16" (1/1) ... [2023-11-21 20:59:16,887 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:59:16" (1/1) ... [2023-11-21 20:59:16,897 INFO L184 PluginConnector]: Executing the observer HeapSplitter from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:59:16" (1/1) ... [2023-11-21 20:59:16,916 INFO L187 HeapSplitter]: Split 4 memory accesses to 3 slices as follows [2, 1, 1] [2023-11-21 20:59:16,916 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:59:16" (1/1) ... [2023-11-21 20:59:16,917 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:59:16" (1/1) ... [2023-11-21 20:59:16,927 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:59:16" (1/1) ... [2023-11-21 20:59:16,931 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:59:16" (1/1) ... [2023-11-21 20:59:16,933 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:59:16" (1/1) ... [2023-11-21 20:59:16,935 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:59:16" (1/1) ... [2023-11-21 20:59:16,949 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 20:59:16,951 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 20:59:16,951 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 20:59:16,952 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 20:59:16,953 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:59:16" (1/1) ... [2023-11-21 20:59:16,959 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 20:59:16,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 20:59:16,995 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 20:59:16,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 20:59:17,031 INFO L130 BoogieDeclarations]: Found specification of procedure t1 [2023-11-21 20:59:17,031 INFO L138 BoogieDeclarations]: Found implementation of procedure t1 [2023-11-21 20:59:17,032 INFO L130 BoogieDeclarations]: Found specification of procedure t2 [2023-11-21 20:59:17,032 INFO L138 BoogieDeclarations]: Found implementation of procedure t2 [2023-11-21 20:59:17,032 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#0 [2023-11-21 20:59:17,034 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#1 [2023-11-21 20:59:17,035 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#2 [2023-11-21 20:59:17,035 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2023-11-21 20:59:17,035 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 20:59:17,036 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-21 20:59:17,036 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-21 20:59:17,036 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2023-11-21 20:59:17,036 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2023-11-21 20:59:17,037 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#2 [2023-11-21 20:59:17,037 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2023-11-21 20:59:17,038 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 20:59:17,038 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 20:59:17,040 WARN L212 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-11-21 20:59:17,179 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 20:59:17,182 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 20:59:17,369 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 20:59:17,535 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 20:59:17,535 INFO L308 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-21 20:59:17,537 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 08:59:17 BoogieIcfgContainer [2023-11-21 20:59:17,537 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 20:59:17,540 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 20:59:17,540 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 20:59:17,544 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 20:59:17,544 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 08:59:16" (1/3) ... [2023-11-21 20:59:17,545 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@335253d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 08:59:17, skipping insertion in model container [2023-11-21 20:59:17,545 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 08:59:16" (2/3) ... [2023-11-21 20:59:17,545 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@335253d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 08:59:17, skipping insertion in model container [2023-11-21 20:59:17,546 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 08:59:17" (3/3) ... [2023-11-21 20:59:17,547 INFO L112 eAbstractionObserver]: Analyzing ICFG fib_safe-5.i [2023-11-21 20:59:17,579 WARN L145 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2023-11-21 20:59:17,589 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 20:59:17,589 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-21 20:59:17,589 INFO L514 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-11-21 20:59:17,627 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-11-21 20:59:17,664 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 32 places, 29 transitions, 66 flow [2023-11-21 20:59:17,694 INFO L124 PetriNetUnfolderBase]: 4/27 cut-off events. [2023-11-21 20:59:17,694 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-21 20:59:17,699 INFO L83 FinitePrefix]: Finished finitePrefix Result has 34 conditions, 27 events. 4/27 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 27 event pairs, 0 based on Foata normal form. 0/22 useless extension candidates. Maximal degree in co-relation 24. Up to 2 conditions per place. [2023-11-21 20:59:17,699 INFO L82 GeneralOperation]: Start removeDead. Operand has 32 places, 29 transitions, 66 flow [2023-11-21 20:59:17,703 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 30 places, 27 transitions, 60 flow [2023-11-21 20:59:17,715 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 20:59:17,722 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;@4d51f2b5, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 20:59:17,722 INFO L358 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2023-11-21 20:59:17,734 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-11-21 20:59:17,734 INFO L124 PetriNetUnfolderBase]: 4/25 cut-off events. [2023-11-21 20:59:17,734 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-21 20:59:17,734 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-21 20:59:17,735 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:59:17,735 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-21 20:59:17,741 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:59:17,741 INFO L85 PathProgramCache]: Analyzing trace with hash -369539475, now seen corresponding path program 1 times [2023-11-21 20:59:17,751 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:59:17,752 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [35605808] [2023-11-21 20:59:17,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:59:17,753 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:59:17,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:59:18,129 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:18,131 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:59:18,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [35605808] [2023-11-21 20:59:18,132 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [35605808] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 20:59:18,132 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 20:59:18,133 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 20:59:18,135 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [993491740] [2023-11-21 20:59:18,136 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 20:59:18,146 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 20:59:18,158 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:59:18,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 20:59:18,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 20:59:18,197 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 12 out of 29 [2023-11-21 20:59:18,200 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 30 places, 27 transitions, 60 flow. Second operand has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:18,201 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-21 20:59:18,201 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 12 of 29 [2023-11-21 20:59:18,202 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-21 20:59:18,319 INFO L124 PetriNetUnfolderBase]: 115/223 cut-off events. [2023-11-21 20:59:18,319 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-11-21 20:59:18,322 INFO L83 FinitePrefix]: Finished finitePrefix Result has 412 conditions, 223 events. 115/223 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 689 event pairs, 20 based on Foata normal form. 9/209 useless extension candidates. Maximal degree in co-relation 398. Up to 118 conditions per place. [2023-11-21 20:59:18,326 INFO L140 encePairwiseOnDemand]: 25/29 looper letters, 20 selfloop transitions, 2 changer transitions 1/33 dead transitions. [2023-11-21 20:59:18,326 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 32 places, 33 transitions, 118 flow [2023-11-21 20:59:18,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 20:59:18,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-21 20:59:18,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 61 transitions. [2023-11-21 20:59:18,340 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.7011494252873564 [2023-11-21 20:59:18,341 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 61 transitions. [2023-11-21 20:59:18,342 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 61 transitions. [2023-11-21 20:59:18,343 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-21 20:59:18,345 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 61 transitions. [2023-11-21 20:59:18,348 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:18,351 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 29.0) internal successors, (116), 4 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:18,352 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 29.0) internal successors, (116), 4 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:18,353 INFO L175 Difference]: Start difference. First operand has 30 places, 27 transitions, 60 flow. Second operand 3 states and 61 transitions. [2023-11-21 20:59:18,354 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 32 places, 33 transitions, 118 flow [2023-11-21 20:59:18,357 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 30 places, 33 transitions, 116 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-11-21 20:59:18,360 INFO L231 Difference]: Finished difference. Result has 31 places, 26 transitions, 66 flow [2023-11-21 20:59:18,362 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=29, PETRI_DIFFERENCE_MINUEND_FLOW=56, PETRI_DIFFERENCE_MINUEND_PLACES=28, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=26, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=24, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=66, PETRI_PLACES=31, PETRI_TRANSITIONS=26} [2023-11-21 20:59:18,367 INFO L281 CegarLoopForPetriNet]: 30 programPoint places, 1 predicate places. [2023-11-21 20:59:18,367 INFO L495 AbstractCegarLoop]: Abstraction has has 31 places, 26 transitions, 66 flow [2023-11-21 20:59:18,368 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:18,368 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-21 20:59:18,368 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:59:18,368 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-21 20:59:18,369 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-21 20:59:18,369 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:59:18,370 INFO L85 PathProgramCache]: Analyzing trace with hash 1403763973, now seen corresponding path program 1 times [2023-11-21 20:59:18,370 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:59:18,370 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [682987354] [2023-11-21 20:59:18,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:59:18,371 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:59:18,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:59:18,514 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:18,514 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:59:18,515 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [682987354] [2023-11-21 20:59:18,515 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [682987354] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 20:59:18,515 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [533877612] [2023-11-21 20:59:18,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:59:18,516 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:59:18,516 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 20:59:18,518 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 20:59:18,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-21 20:59:18,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:59:18,625 INFO L262 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-21 20:59:18,630 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 20:59:18,671 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:18,672 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 20:59:18,693 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:18,694 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [533877612] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 20:59:18,694 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 20:59:18,694 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-11-21 20:59:18,695 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626861266] [2023-11-21 20:59:18,696 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 20:59:18,696 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-21 20:59:18,697 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:59:18,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-21 20:59:18,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-11-21 20:59:18,698 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 12 out of 29 [2023-11-21 20:59:18,699 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 31 places, 26 transitions, 66 flow. Second operand has 7 states, 7 states have (on average 14.0) internal successors, (98), 7 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) [2023-11-21 20:59:18,699 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-21 20:59:18,699 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 12 of 29 [2023-11-21 20:59:18,700 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-21 20:59:18,854 INFO L124 PetriNetUnfolderBase]: 151/277 cut-off events. [2023-11-21 20:59:18,854 INFO L125 PetriNetUnfolderBase]: For 3/3 co-relation queries the response was YES. [2023-11-21 20:59:18,856 INFO L83 FinitePrefix]: Finished finitePrefix Result has 584 conditions, 277 events. 151/277 cut-off events. For 3/3 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 802 event pairs, 20 based on Foata normal form. 0/254 useless extension candidates. Maximal degree in co-relation 569. Up to 91 conditions per place. [2023-11-21 20:59:18,859 INFO L140 encePairwiseOnDemand]: 26/29 looper letters, 38 selfloop transitions, 5 changer transitions 0/53 dead transitions. [2023-11-21 20:59:18,860 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 35 places, 53 transitions, 212 flow [2023-11-21 20:59:18,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 20:59:18,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-11-21 20:59:18,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 118 transitions. [2023-11-21 20:59:18,863 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6781609195402298 [2023-11-21 20:59:18,863 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 118 transitions. [2023-11-21 20:59:18,863 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 118 transitions. [2023-11-21 20:59:18,864 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-21 20:59:18,864 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 118 transitions. [2023-11-21 20:59:18,865 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 19.666666666666668) internal successors, (118), 6 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:18,867 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 29.0) internal successors, (203), 7 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:18,867 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 29.0) internal successors, (203), 7 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:18,867 INFO L175 Difference]: Start difference. First operand has 31 places, 26 transitions, 66 flow. Second operand 6 states and 118 transitions. [2023-11-21 20:59:18,868 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 35 places, 53 transitions, 212 flow [2023-11-21 20:59:18,869 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 34 places, 53 transitions, 210 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-11-21 20:59:18,871 INFO L231 Difference]: Finished difference. Result has 37 places, 29 transitions, 100 flow [2023-11-21 20:59:18,871 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=29, PETRI_DIFFERENCE_MINUEND_FLOW=64, PETRI_DIFFERENCE_MINUEND_PLACES=29, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=26, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=23, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=100, PETRI_PLACES=37, PETRI_TRANSITIONS=29} [2023-11-21 20:59:18,872 INFO L281 CegarLoopForPetriNet]: 30 programPoint places, 7 predicate places. [2023-11-21 20:59:18,872 INFO L495 AbstractCegarLoop]: Abstraction has has 37 places, 29 transitions, 100 flow [2023-11-21 20:59:18,873 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 14.0) internal successors, (98), 7 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) [2023-11-21 20:59:18,873 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-21 20:59:18,873 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:59:18,906 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-21 20:59:19,092 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:59:19,092 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-21 20:59:19,093 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:59:19,093 INFO L85 PathProgramCache]: Analyzing trace with hash -30528403, now seen corresponding path program 2 times [2023-11-21 20:59:19,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:59:19,094 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1322796727] [2023-11-21 20:59:19,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:59:19,094 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:59:19,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:59:19,277 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:19,278 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:59:19,278 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1322796727] [2023-11-21 20:59:19,278 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1322796727] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 20:59:19,279 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [15181734] [2023-11-21 20:59:19,279 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-21 20:59:19,279 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:59:19,279 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 20:59:19,280 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 20:59:19,283 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-21 20:59:19,404 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-21 20:59:19,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 20:59:19,406 INFO L262 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-21 20:59:19,411 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 20:59:19,446 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:19,446 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 20:59:19,527 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:19,528 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [15181734] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 20:59:19,528 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 20:59:19,528 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2023-11-21 20:59:19,528 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [655305975] [2023-11-21 20:59:19,528 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 20:59:19,530 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-21 20:59:19,535 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:59:19,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-21 20:59:19,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-11-21 20:59:19,538 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 12 out of 29 [2023-11-21 20:59:19,539 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 37 places, 29 transitions, 100 flow. Second operand has 13 states, 13 states have (on average 13.538461538461538) internal successors, (176), 13 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:19,539 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-21 20:59:19,539 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 12 of 29 [2023-11-21 20:59:19,540 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-21 20:59:19,794 INFO L124 PetriNetUnfolderBase]: 259/439 cut-off events. [2023-11-21 20:59:19,794 INFO L125 PetriNetUnfolderBase]: For 207/207 co-relation queries the response was YES. [2023-11-21 20:59:19,799 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1110 conditions, 439 events. 259/439 cut-off events. For 207/207 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1199 event pairs, 20 based on Foata normal form. 54/479 useless extension candidates. Maximal degree in co-relation 1091. Up to 109 conditions per place. [2023-11-21 20:59:19,805 INFO L140 encePairwiseOnDemand]: 26/29 looper letters, 74 selfloop transitions, 11 changer transitions 0/95 dead transitions. [2023-11-21 20:59:19,805 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 48 places, 95 transitions, 426 flow [2023-11-21 20:59:19,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-21 20:59:19,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2023-11-21 20:59:19,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 235 transitions. [2023-11-21 20:59:19,813 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6752873563218391 [2023-11-21 20:59:19,814 INFO L72 ComplementDD]: Start complementDD. Operand 12 states and 235 transitions. [2023-11-21 20:59:19,814 INFO L73 IsDeterministic]: Start isDeterministic. Operand 12 states and 235 transitions. [2023-11-21 20:59:19,816 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-21 20:59:19,817 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 12 states and 235 transitions. [2023-11-21 20:59:19,819 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 13 states, 12 states have (on average 19.583333333333332) internal successors, (235), 12 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:19,822 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 13 states, 13 states have (on average 29.0) internal successors, (377), 13 states have internal predecessors, (377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:19,823 INFO L81 ComplementDD]: Finished complementDD. Result has 13 states, 13 states have (on average 29.0) internal successors, (377), 13 states have internal predecessors, (377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:19,823 INFO L175 Difference]: Start difference. First operand has 37 places, 29 transitions, 100 flow. Second operand 12 states and 235 transitions. [2023-11-21 20:59:19,823 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 48 places, 95 transitions, 426 flow [2023-11-21 20:59:19,832 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 47 places, 95 transitions, 412 flow, removed 6 selfloop flow, removed 1 redundant places. [2023-11-21 20:59:19,834 INFO L231 Difference]: Finished difference. Result has 53 places, 35 transitions, 170 flow [2023-11-21 20:59:19,835 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=29, PETRI_DIFFERENCE_MINUEND_FLOW=86, PETRI_DIFFERENCE_MINUEND_PLACES=36, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=29, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=23, PETRI_DIFFERENCE_SUBTRAHEND_STATES=12, PETRI_FLOW=170, PETRI_PLACES=53, PETRI_TRANSITIONS=35} [2023-11-21 20:59:19,836 INFO L281 CegarLoopForPetriNet]: 30 programPoint places, 23 predicate places. [2023-11-21 20:59:19,836 INFO L495 AbstractCegarLoop]: Abstraction has has 53 places, 35 transitions, 170 flow [2023-11-21 20:59:19,837 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 13.538461538461538) internal successors, (176), 13 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:19,837 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-21 20:59:19,837 INFO L208 CegarLoopForPetriNet]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:59:19,858 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-21 20:59:20,058 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:59:20,058 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-21 20:59:20,059 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:59:20,059 INFO L85 PathProgramCache]: Analyzing trace with hash -246684307, now seen corresponding path program 3 times [2023-11-21 20:59:20,059 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:59:20,059 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914692637] [2023-11-21 20:59:20,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:59:20,060 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:59:20,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:59:20,365 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:20,365 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:59:20,365 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914692637] [2023-11-21 20:59:20,366 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1914692637] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 20:59:20,366 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1059169535] [2023-11-21 20:59:20,366 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 20:59:20,366 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:59:20,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 20:59:20,368 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 20:59:20,398 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-21 20:59:20,502 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-11-21 20:59:20,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 20:59:20,504 INFO L262 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-21 20:59:20,507 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 20:59:20,567 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:20,567 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 20:59:20,694 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:20,695 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1059169535] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 20:59:20,695 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 20:59:20,695 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 15 [2023-11-21 20:59:20,696 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518238321] [2023-11-21 20:59:20,696 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 20:59:20,697 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-21 20:59:20,697 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:59:20,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-21 20:59:20,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2023-11-21 20:59:20,699 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 12 out of 29 [2023-11-21 20:59:20,700 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 53 places, 35 transitions, 170 flow. Second operand has 15 states, 15 states have (on average 13.533333333333333) internal successors, (203), 15 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:20,700 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-21 20:59:20,700 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 12 of 29 [2023-11-21 20:59:20,701 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-21 20:59:20,959 INFO L124 PetriNetUnfolderBase]: 295/493 cut-off events. [2023-11-21 20:59:20,959 INFO L125 PetriNetUnfolderBase]: For 963/963 co-relation queries the response was YES. [2023-11-21 20:59:20,961 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1432 conditions, 493 events. 295/493 cut-off events. For 963/963 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1335 event pairs, 20 based on Foata normal form. 18/497 useless extension candidates. Maximal degree in co-relation 1406. Up to 100 conditions per place. [2023-11-21 20:59:20,966 INFO L140 encePairwiseOnDemand]: 26/29 looper letters, 86 selfloop transitions, 13 changer transitions 0/109 dead transitions. [2023-11-21 20:59:20,966 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 66 places, 109 transitions, 528 flow [2023-11-21 20:59:20,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-21 20:59:20,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2023-11-21 20:59:20,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 269 transitions. [2023-11-21 20:59:20,969 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6625615763546798 [2023-11-21 20:59:20,969 INFO L72 ComplementDD]: Start complementDD. Operand 14 states and 269 transitions. [2023-11-21 20:59:20,969 INFO L73 IsDeterministic]: Start isDeterministic. Operand 14 states and 269 transitions. [2023-11-21 20:59:20,969 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-21 20:59:20,970 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 14 states and 269 transitions. [2023-11-21 20:59:20,971 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 15 states, 14 states have (on average 19.214285714285715) internal successors, (269), 14 states have internal predecessors, (269), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:20,973 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 15 states, 15 states have (on average 29.0) internal successors, (435), 15 states have internal predecessors, (435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:20,973 INFO L81 ComplementDD]: Finished complementDD. Result has 15 states, 15 states have (on average 29.0) internal successors, (435), 15 states have internal predecessors, (435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:20,973 INFO L175 Difference]: Start difference. First operand has 53 places, 35 transitions, 170 flow. Second operand 14 states and 269 transitions. [2023-11-21 20:59:20,973 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 66 places, 109 transitions, 528 flow [2023-11-21 20:59:20,980 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 61 places, 109 transitions, 476 flow, removed 21 selfloop flow, removed 5 redundant places. [2023-11-21 20:59:20,982 INFO L231 Difference]: Finished difference. Result has 63 places, 37 transitions, 170 flow [2023-11-21 20:59:20,983 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=29, PETRI_DIFFERENCE_MINUEND_FLOW=122, PETRI_DIFFERENCE_MINUEND_PLACES=48, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=35, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=12, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=23, PETRI_DIFFERENCE_SUBTRAHEND_STATES=14, PETRI_FLOW=170, PETRI_PLACES=63, PETRI_TRANSITIONS=37} [2023-11-21 20:59:20,984 INFO L281 CegarLoopForPetriNet]: 30 programPoint places, 33 predicate places. [2023-11-21 20:59:20,984 INFO L495 AbstractCegarLoop]: Abstraction has has 63 places, 37 transitions, 170 flow [2023-11-21 20:59:20,984 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 13.533333333333333) internal successors, (203), 15 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:20,985 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-21 20:59:20,985 INFO L208 CegarLoopForPetriNet]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:59:21,014 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-11-21 20:59:21,200 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:59:21,201 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-21 20:59:21,201 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:59:21,201 INFO L85 PathProgramCache]: Analyzing trace with hash -1653671827, now seen corresponding path program 4 times [2023-11-21 20:59:21,201 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:59:21,202 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1175976444] [2023-11-21 20:59:21,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:59:21,202 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:59:21,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:59:22,555 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:22,555 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:59:22,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1175976444] [2023-11-21 20:59:22,556 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1175976444] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 20:59:22,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1896932411] [2023-11-21 20:59:22,556 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-21 20:59:22,556 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:59:22,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 20:59:22,558 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 20:59:22,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-21 20:59:22,670 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-21 20:59:22,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 20:59:22,672 INFO L262 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 47 conjunts are in the unsatisfiable core [2023-11-21 20:59:22,676 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 20:59:23,629 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 55 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:23,629 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 20:59:24,698 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:24,698 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1896932411] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 20:59:24,698 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 20:59:24,698 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 54 [2023-11-21 20:59:24,699 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741409257] [2023-11-21 20:59:24,701 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 20:59:24,705 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2023-11-21 20:59:24,706 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:59:24,707 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2023-11-21 20:59:24,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=420, Invalid=2550, Unknown=0, NotChecked=0, Total=2970 [2023-11-21 20:59:24,853 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 5 out of 29 [2023-11-21 20:59:24,854 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 63 places, 37 transitions, 170 flow. Second operand has 55 states, 55 states have (on average 6.3090909090909095) internal successors, (347), 55 states have internal predecessors, (347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:24,854 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-21 20:59:24,855 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 5 of 29 [2023-11-21 20:59:24,855 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-21 20:59:43,804 INFO L124 PetriNetUnfolderBase]: 12499/20307 cut-off events. [2023-11-21 20:59:43,804 INFO L125 PetriNetUnfolderBase]: For 30423/30423 co-relation queries the response was YES. [2023-11-21 20:59:43,878 INFO L83 FinitePrefix]: Finished finitePrefix Result has 52504 conditions, 20307 events. 12499/20307 cut-off events. For 30423/30423 co-relation queries the response was YES. Maximal size of possible extension queue 352. Compared 127529 event pairs, 70 based on Foata normal form. 0/20021 useless extension candidates. Maximal degree in co-relation 52474. Up to 2607 conditions per place. [2023-11-21 20:59:44,000 INFO L140 encePairwiseOnDemand]: 18/29 looper letters, 505 selfloop transitions, 455 changer transitions 613/1576 dead transitions. [2023-11-21 20:59:44,001 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 217 places, 1576 transitions, 8869 flow [2023-11-21 20:59:44,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 155 states. [2023-11-21 20:59:44,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 155 states. [2023-11-21 20:59:44,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 2063 transitions. [2023-11-21 20:59:44,013 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4589543937708565 [2023-11-21 20:59:44,014 INFO L72 ComplementDD]: Start complementDD. Operand 155 states and 2063 transitions. [2023-11-21 20:59:44,014 INFO L73 IsDeterministic]: Start isDeterministic. Operand 155 states and 2063 transitions. [2023-11-21 20:59:44,016 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-21 20:59:44,017 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 155 states and 2063 transitions. [2023-11-21 20:59:44,025 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 156 states, 155 states have (on average 13.30967741935484) internal successors, (2063), 155 states have internal predecessors, (2063), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:44,036 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 156 states, 156 states have (on average 29.0) internal successors, (4524), 156 states have internal predecessors, (4524), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:44,038 INFO L81 ComplementDD]: Finished complementDD. Result has 156 states, 156 states have (on average 29.0) internal successors, (4524), 156 states have internal predecessors, (4524), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:44,039 INFO L175 Difference]: Start difference. First operand has 63 places, 37 transitions, 170 flow. Second operand 155 states and 2063 transitions. [2023-11-21 20:59:44,039 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 217 places, 1576 transitions, 8869 flow [2023-11-21 20:59:44,282 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 206 places, 1576 transitions, 7871 flow, removed 210 selfloop flow, removed 11 redundant places. [2023-11-21 20:59:44,303 INFO L231 Difference]: Finished difference. Result has 268 places, 538 transitions, 3240 flow [2023-11-21 20:59:44,303 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=29, PETRI_DIFFERENCE_MINUEND_FLOW=134, PETRI_DIFFERENCE_MINUEND_PLACES=52, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=37, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=18, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=18, PETRI_DIFFERENCE_SUBTRAHEND_STATES=155, PETRI_FLOW=3240, PETRI_PLACES=268, PETRI_TRANSITIONS=538} [2023-11-21 20:59:44,307 INFO L281 CegarLoopForPetriNet]: 30 programPoint places, 238 predicate places. [2023-11-21 20:59:44,307 INFO L495 AbstractCegarLoop]: Abstraction has has 268 places, 538 transitions, 3240 flow [2023-11-21 20:59:44,307 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 6.3090909090909095) internal successors, (347), 55 states have internal predecessors, (347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:44,307 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-21 20:59:44,308 INFO L208 CegarLoopForPetriNet]: trace histogram [12, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 20:59:44,334 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-21 20:59:44,524 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:59:44,524 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-11-21 20:59:44,525 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 20:59:44,525 INFO L85 PathProgramCache]: Analyzing trace with hash -1148304739, now seen corresponding path program 1 times [2023-11-21 20:59:44,525 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 20:59:44,525 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1304781114] [2023-11-21 20:59:44,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:59:44,525 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 20:59:44,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:59:45,789 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:45,790 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 20:59:45,790 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1304781114] [2023-11-21 20:59:45,790 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1304781114] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 20:59:45,790 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1069822206] [2023-11-21 20:59:45,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 20:59:45,790 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 20:59:45,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 20:59:45,792 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 20:59:45,812 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2cd88f0c-4427-4dc4-8bae-298850754b6f/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-21 20:59:45,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 20:59:45,902 INFO L262 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 49 conjunts are in the unsatisfiable core [2023-11-21 20:59:45,905 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 20:59:46,880 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 55 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:46,880 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 20:59:48,037 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 20:59:48,037 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1069822206] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 20:59:48,038 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 20:59:48,038 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 61 [2023-11-21 20:59:48,038 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766150373] [2023-11-21 20:59:48,038 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 20:59:48,039 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2023-11-21 20:59:48,040 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 20:59:48,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2023-11-21 20:59:48,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=456, Invalid=3326, Unknown=0, NotChecked=0, Total=3782 [2023-11-21 20:59:48,111 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 5 out of 29 [2023-11-21 20:59:48,112 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 268 places, 538 transitions, 3240 flow. Second operand has 62 states, 62 states have (on average 6.354838709677419) internal successors, (394), 62 states have internal predecessors, (394), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 20:59:48,112 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-21 20:59:48,112 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 5 of 29 [2023-11-21 20:59:48,113 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand