./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/weaver/chl-nzb-file-symm.wvr.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 0e0057cc 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_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/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_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/weaver/chl-nzb-file-symm.wvr.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 48ddce9ee02b3ea4431cf137593b71facb450c3e223dbff4f116c3c0ac1377b5 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-26 10:46:54,607 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-26 10:46:54,739 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2023-11-26 10:46:54,749 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-26 10:46:54,750 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-26 10:46:54,787 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-26 10:46:54,788 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-26 10:46:54,789 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-26 10:46:54,790 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2023-11-26 10:46:54,795 INFO L153 SettingsManager]: * Use memory slicer=true [2023-11-26 10:46:54,796 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-26 10:46:54,796 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-26 10:46:54,797 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-26 10:46:54,799 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-26 10:46:54,799 INFO L153 SettingsManager]: * Use SBE=true [2023-11-26 10:46:54,800 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-26 10:46:54,801 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-26 10:46:54,801 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-26 10:46:54,801 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-26 10:46:54,802 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-26 10:46:54,802 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-26 10:46:54,803 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-26 10:46:54,803 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-26 10:46:54,804 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-26 10:46:54,804 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-26 10:46:54,805 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-26 10:46:54,805 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-26 10:46:54,806 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-26 10:46:54,807 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-26 10:46:54,807 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-26 10:46:54,809 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-26 10:46:54,809 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-26 10:46:54,809 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2023-11-26 10:46:54,810 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-26 10:46:54,810 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-26 10:46:54,810 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-26 10:46:54,810 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-26 10:46:54,811 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-26 10:46:54,811 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-26 10:46:54,811 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-26 10:46:54,812 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-26 10:46:54,812 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_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 48ddce9ee02b3ea4431cf137593b71facb450c3e223dbff4f116c3c0ac1377b5 [2023-11-26 10:46:55,140 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-26 10:46:55,165 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-26 10:46:55,168 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-26 10:46:55,169 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-26 10:46:55,169 INFO L274 PluginConnector]: CDTParser initialized [2023-11-26 10:46:55,171 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/../../sv-benchmarks/c/weaver/chl-nzb-file-symm.wvr.c [2023-11-26 10:46:58,280 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-26 10:46:58,585 INFO L384 CDTParser]: Found 1 translation units. [2023-11-26 10:46:58,585 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/sv-benchmarks/c/weaver/chl-nzb-file-symm.wvr.c [2023-11-26 10:46:58,597 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/data/0662c79c3/dbaaaf5d5d814a6d9c187a462f9c569d/FLAG9dab4944c [2023-11-26 10:46:58,613 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/data/0662c79c3/dbaaaf5d5d814a6d9c187a462f9c569d [2023-11-26 10:46:58,616 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-26 10:46:58,618 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-26 10:46:58,620 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-26 10:46:58,620 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-26 10:46:58,626 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-26 10:46:58,627 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 10:46:58" (1/1) ... [2023-11-26 10:46:58,628 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5c2bfeb6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:58, skipping insertion in model container [2023-11-26 10:46:58,629 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 10:46:58" (1/1) ... [2023-11-26 10:46:58,660 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-26 10:46:58,922 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-26 10:46:58,935 INFO L202 MainTranslator]: Completed pre-run [2023-11-26 10:46:58,978 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-26 10:46:58,996 INFO L206 MainTranslator]: Completed translation [2023-11-26 10:46:58,997 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:58 WrapperNode [2023-11-26 10:46:58,997 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-26 10:46:58,998 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-26 10:46:58,998 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-26 10:46:58,998 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-26 10:46:59,007 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:58" (1/1) ... [2023-11-26 10:46:59,019 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:58" (1/1) ... [2023-11-26 10:46:59,073 INFO L138 Inliner]: procedures = 25, calls = 56, calls flagged for inlining = 22, calls inlined = 30, statements flattened = 411 [2023-11-26 10:46:59,073 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-26 10:46:59,074 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-26 10:46:59,074 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-26 10:46:59,075 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-26 10:46:59,090 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:58" (1/1) ... [2023-11-26 10:46:59,090 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:58" (1/1) ... [2023-11-26 10:46:59,098 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:58" (1/1) ... [2023-11-26 10:46:59,122 INFO L175 MemorySlicer]: Split 24 memory accesses to 4 slices as follows [2, 2, 18, 2]. 75 percent of accesses are in the largest equivalence class. The 2 initializations are split as follows [2, 0, 0, 0]. The 4 writes are split as follows [0, 1, 2, 1]. [2023-11-26 10:46:59,122 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:58" (1/1) ... [2023-11-26 10:46:59,122 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:58" (1/1) ... [2023-11-26 10:46:59,141 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:58" (1/1) ... [2023-11-26 10:46:59,148 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:58" (1/1) ... [2023-11-26 10:46:59,152 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:58" (1/1) ... [2023-11-26 10:46:59,155 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:58" (1/1) ... [2023-11-26 10:46:59,163 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-26 10:46:59,164 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-26 10:46:59,164 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-26 10:46:59,164 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-26 10:46:59,165 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:58" (1/1) ... [2023-11-26 10:46:59,172 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2023-11-26 10:46:59,189 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 10:46:59,203 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2023-11-26 10:46:59,229 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2023-11-26 10:46:59,268 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-26 10:46:59,268 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-26 10:46:59,268 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#0 [2023-11-26 10:46:59,269 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#1 [2023-11-26 10:46:59,269 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#2 [2023-11-26 10:46:59,270 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#3 [2023-11-26 10:46:59,271 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#0 [2023-11-26 10:46:59,271 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#1 [2023-11-26 10:46:59,271 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#2 [2023-11-26 10:46:59,271 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#3 [2023-11-26 10:46:59,271 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2023-11-26 10:46:59,272 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2023-11-26 10:46:59,275 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2023-11-26 10:46:59,275 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2023-11-26 10:46:59,276 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2023-11-26 10:46:59,276 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2023-11-26 10:46:59,276 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#2 [2023-11-26 10:46:59,276 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#3 [2023-11-26 10:46:59,276 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-26 10:46:59,276 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-26 10:46:59,277 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-26 10:46:59,277 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-26 10:46:59,280 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 10:46:59,508 INFO L241 CfgBuilder]: Building ICFG [2023-11-26 10:46:59,517 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-26 10:47:00,464 INFO L282 CfgBuilder]: Performing block encoding [2023-11-26 10:47:01,217 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-26 10:47:01,217 INFO L309 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-26 10:47:01,218 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 10:47:01 BoogieIcfgContainer [2023-11-26 10:47:01,218 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-26 10:47:01,221 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-26 10:47:01,222 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-26 10:47:01,225 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-26 10:47:01,226 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.11 10:46:58" (1/3) ... [2023-11-26 10:47:01,227 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64989f70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 10:47:01, skipping insertion in model container [2023-11-26 10:47:01,228 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:58" (2/3) ... [2023-11-26 10:47:01,228 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64989f70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 10:47:01, skipping insertion in model container [2023-11-26 10:47:01,228 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 10:47:01" (3/3) ... [2023-11-26 10:47:01,230 INFO L112 eAbstractionObserver]: Analyzing ICFG chl-nzb-file-symm.wvr.c [2023-11-26 10:47:01,252 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-26 10:47:01,252 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 46 error locations. [2023-11-26 10:47:01,252 INFO L514 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-11-26 10:47:01,369 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-11-26 10:47:01,410 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 126 places, 139 transitions, 292 flow [2023-11-26 10:47:01,476 INFO L124 PetriNetUnfolderBase]: 20/137 cut-off events. [2023-11-26 10:47:01,476 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-11-26 10:47:01,484 INFO L83 FinitePrefix]: Finished finitePrefix Result has 146 conditions, 137 events. 20/137 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 450 event pairs, 0 based on Foata normal form. 0/71 useless extension candidates. Maximal degree in co-relation 113. Up to 2 conditions per place. [2023-11-26 10:47:01,484 INFO L82 GeneralOperation]: Start removeDead. Operand has 126 places, 139 transitions, 292 flow [2023-11-26 10:47:01,499 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 123 places, 136 transitions, 284 flow [2023-11-26 10:47:01,524 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-26 10:47:01,533 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@32142945, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-26 10:47:01,533 INFO L358 AbstractCegarLoop]: Starting to check reachability of 80 error locations. [2023-11-26 10:47:01,539 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-11-26 10:47:01,539 INFO L124 PetriNetUnfolderBase]: 1/4 cut-off events. [2023-11-26 10:47:01,539 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-26 10:47:01,540 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:47:01,540 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1] [2023-11-26 10:47:01,541 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-26 10:47:01,553 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:47:01,553 INFO L85 PathProgramCache]: Analyzing trace with hash 1303401, now seen corresponding path program 1 times [2023-11-26 10:47:01,569 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:47:01,569 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [709123457] [2023-11-26 10:47:01,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:47:01,570 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:47:01,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:47:01,849 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 10:47:01,850 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:47:01,850 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [709123457] [2023-11-26 10:47:01,851 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [709123457] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-26 10:47:01,851 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-26 10:47:01,851 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-26 10:47:01,853 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644032365] [2023-11-26 10:47:01,853 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-26 10:47:01,862 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-26 10:47:01,868 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:47:01,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-26 10:47:01,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-26 10:47:01,975 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 77 out of 139 [2023-11-26 10:47:01,978 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 123 places, 136 transitions, 284 flow. Second operand has 3 states, 3 states have (on average 78.0) internal successors, (234), 3 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:01,978 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:47:01,979 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 77 of 139 [2023-11-26 10:47:01,980 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 10:47:02,825 INFO L124 PetriNetUnfolderBase]: 1323/3208 cut-off events. [2023-11-26 10:47:02,825 INFO L125 PetriNetUnfolderBase]: For 58/58 co-relation queries the response was YES. [2023-11-26 10:47:02,835 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5159 conditions, 3208 events. 1323/3208 cut-off events. For 58/58 co-relation queries the response was YES. Maximal size of possible extension queue 119. Compared 23482 event pairs, 701 based on Foata normal form. 60/2473 useless extension candidates. Maximal degree in co-relation 5009. Up to 1897 conditions per place. [2023-11-26 10:47:02,863 INFO L140 encePairwiseOnDemand]: 132/139 looper letters, 54 selfloop transitions, 2 changer transitions 0/130 dead transitions. [2023-11-26 10:47:02,863 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 121 places, 130 transitions, 384 flow [2023-11-26 10:47:02,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-26 10:47:02,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-26 10:47:02,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 292 transitions. [2023-11-26 10:47:02,879 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.7002398081534772 [2023-11-26 10:47:02,879 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 292 transitions. [2023-11-26 10:47:02,880 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 292 transitions. [2023-11-26 10:47:02,882 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 10:47:02,884 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 292 transitions. [2023-11-26 10:47:02,888 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 97.33333333333333) internal successors, (292), 3 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:02,893 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 139.0) internal successors, (556), 4 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:02,894 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 139.0) internal successors, (556), 4 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:02,896 INFO L175 Difference]: Start difference. First operand has 123 places, 136 transitions, 284 flow. Second operand 3 states and 292 transitions. [2023-11-26 10:47:02,897 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 121 places, 130 transitions, 384 flow [2023-11-26 10:47:02,901 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 117 places, 130 transitions, 376 flow, removed 0 selfloop flow, removed 4 redundant places. [2023-11-26 10:47:02,905 INFO L231 Difference]: Finished difference. Result has 117 places, 130 transitions, 268 flow [2023-11-26 10:47:02,907 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=264, PETRI_DIFFERENCE_MINUEND_PLACES=115, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=130, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=128, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=268, PETRI_PLACES=117, PETRI_TRANSITIONS=130} [2023-11-26 10:47:02,911 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, -6 predicate places. [2023-11-26 10:47:02,911 INFO L495 AbstractCegarLoop]: Abstraction has has 117 places, 130 transitions, 268 flow [2023-11-26 10:47:02,912 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 78.0) internal successors, (234), 3 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:02,912 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:47:02,912 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1] [2023-11-26 10:47:02,912 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-26 10:47:02,913 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-26 10:47:02,913 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:47:02,913 INFO L85 PathProgramCache]: Analyzing trace with hash 1303402, now seen corresponding path program 1 times [2023-11-26 10:47:02,913 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:47:02,914 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724525274] [2023-11-26 10:47:02,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:47:02,914 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:47:02,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:47:03,266 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 10:47:03,266 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:47:03,266 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724525274] [2023-11-26 10:47:03,267 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1724525274] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-26 10:47:03,267 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-26 10:47:03,267 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-26 10:47:03,267 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124390985] [2023-11-26 10:47:03,267 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-26 10:47:03,268 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-26 10:47:03,269 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:47:03,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-26 10:47:03,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-26 10:47:03,402 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 77 out of 139 [2023-11-26 10:47:03,402 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 117 places, 130 transitions, 268 flow. Second operand has 4 states, 4 states have (on average 77.75) internal successors, (311), 4 states have internal predecessors, (311), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:03,403 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:47:03,403 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 77 of 139 [2023-11-26 10:47:03,403 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 10:47:03,974 INFO L124 PetriNetUnfolderBase]: 1323/3212 cut-off events. [2023-11-26 10:47:03,974 INFO L125 PetriNetUnfolderBase]: For 14/14 co-relation queries the response was YES. [2023-11-26 10:47:03,980 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5140 conditions, 3212 events. 1323/3212 cut-off events. For 14/14 co-relation queries the response was YES. Maximal size of possible extension queue 119. Compared 23486 event pairs, 701 based on Foata normal form. 1/2417 useless extension candidates. Maximal degree in co-relation 5109. Up to 1905 conditions per place. [2023-11-26 10:47:04,002 INFO L140 encePairwiseOnDemand]: 132/139 looper letters, 58 selfloop transitions, 4 changer transitions 0/134 dead transitions. [2023-11-26 10:47:04,002 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 119 places, 134 transitions, 400 flow [2023-11-26 10:47:04,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-26 10:47:04,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-26 10:47:04,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 297 transitions. [2023-11-26 10:47:04,006 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.7122302158273381 [2023-11-26 10:47:04,006 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 297 transitions. [2023-11-26 10:47:04,006 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 297 transitions. [2023-11-26 10:47:04,007 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 10:47:04,007 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 297 transitions. [2023-11-26 10:47:04,008 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 99.0) internal successors, (297), 3 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:04,011 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 139.0) internal successors, (556), 4 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:04,011 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 139.0) internal successors, (556), 4 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:04,012 INFO L175 Difference]: Start difference. First operand has 117 places, 130 transitions, 268 flow. Second operand 3 states and 297 transitions. [2023-11-26 10:47:04,012 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 119 places, 134 transitions, 400 flow [2023-11-26 10:47:04,013 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 117 places, 134 transitions, 396 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-11-26 10:47:04,016 INFO L231 Difference]: Finished difference. Result has 118 places, 132 transitions, 290 flow [2023-11-26 10:47:04,017 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=264, PETRI_DIFFERENCE_MINUEND_PLACES=115, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=130, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=126, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=290, PETRI_PLACES=118, PETRI_TRANSITIONS=132} [2023-11-26 10:47:04,018 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, -5 predicate places. [2023-11-26 10:47:04,018 INFO L495 AbstractCegarLoop]: Abstraction has has 118 places, 132 transitions, 290 flow [2023-11-26 10:47:04,019 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 77.75) internal successors, (311), 4 states have internal predecessors, (311), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:04,019 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:47:04,019 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1] [2023-11-26 10:47:04,019 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-26 10:47:04,020 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-26 10:47:04,020 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:47:04,021 INFO L85 PathProgramCache]: Analyzing trace with hash 1252610931, now seen corresponding path program 1 times [2023-11-26 10:47:04,021 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:47:04,021 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1665460908] [2023-11-26 10:47:04,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:47:04,022 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:47:04,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:47:04,323 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 10:47:04,323 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:47:04,324 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1665460908] [2023-11-26 10:47:04,324 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1665460908] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 10:47:04,324 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [166103229] [2023-11-26 10:47:04,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:47:04,325 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 10:47:04,325 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 10:47:04,328 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 10:47:04,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-26 10:47:04,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:47:04,504 INFO L262 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-26 10:47:04,519 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 10:47:04,582 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-26 10:47:04,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-26 10:47:04,599 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-26 10:47:04,610 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-26 10:47:04,611 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-26 10:47:04,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-26 10:47:04,618 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2023-11-26 10:47:04,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-26 10:47:04,639 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 1 [2023-11-26 10:47:04,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-26 10:47:04,649 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-26 10:47:04,709 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 10:47:04,709 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 10:47:04,793 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 10:47:04,794 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [166103229] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-26 10:47:04,795 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-26 10:47:04,795 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 2, 2] total 7 [2023-11-26 10:47:04,796 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933516666] [2023-11-26 10:47:04,796 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-26 10:47:04,796 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-26 10:47:04,797 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:47:04,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-26 10:47:04,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2023-11-26 10:47:05,361 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 77 out of 139 [2023-11-26 10:47:05,362 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 118 places, 132 transitions, 290 flow. Second operand has 9 states, 9 states have (on average 78.66666666666667) internal successors, (708), 9 states have internal predecessors, (708), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:05,362 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:47:05,362 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 77 of 139 [2023-11-26 10:47:05,362 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 10:47:06,198 INFO L124 PetriNetUnfolderBase]: 1327/3228 cut-off events. [2023-11-26 10:47:06,199 INFO L125 PetriNetUnfolderBase]: For 14/14 co-relation queries the response was YES. [2023-11-26 10:47:06,208 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5192 conditions, 3228 events. 1327/3228 cut-off events. For 14/14 co-relation queries the response was YES. Maximal size of possible extension queue 119. Compared 23543 event pairs, 701 based on Foata normal form. 2/2435 useless extension candidates. Maximal degree in co-relation 5141. Up to 1907 conditions per place. [2023-11-26 10:47:06,232 INFO L140 encePairwiseOnDemand]: 132/139 looper letters, 64 selfloop transitions, 14 changer transitions 0/150 dead transitions. [2023-11-26 10:47:06,232 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 123 places, 150 transitions, 504 flow [2023-11-26 10:47:06,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-26 10:47:06,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-11-26 10:47:06,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 548 transitions. [2023-11-26 10:47:06,236 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.657074340527578 [2023-11-26 10:47:06,236 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 548 transitions. [2023-11-26 10:47:06,237 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 548 transitions. [2023-11-26 10:47:06,237 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 10:47:06,237 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 548 transitions. [2023-11-26 10:47:06,239 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 91.33333333333333) internal successors, (548), 6 states have internal predecessors, (548), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:06,243 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 139.0) internal successors, (973), 7 states have internal predecessors, (973), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:06,244 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 139.0) internal successors, (973), 7 states have internal predecessors, (973), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:06,244 INFO L175 Difference]: Start difference. First operand has 118 places, 132 transitions, 290 flow. Second operand 6 states and 548 transitions. [2023-11-26 10:47:06,244 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 123 places, 150 transitions, 504 flow [2023-11-26 10:47:06,247 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 122 places, 150 transitions, 498 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-11-26 10:47:06,250 INFO L231 Difference]: Finished difference. Result has 125 places, 142 transitions, 388 flow [2023-11-26 10:47:06,251 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=286, PETRI_DIFFERENCE_MINUEND_PLACES=117, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=132, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=7, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=125, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=388, PETRI_PLACES=125, PETRI_TRANSITIONS=142} [2023-11-26 10:47:06,252 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, 2 predicate places. [2023-11-26 10:47:06,253 INFO L495 AbstractCegarLoop]: Abstraction has has 125 places, 142 transitions, 388 flow [2023-11-26 10:47:06,253 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 78.66666666666667) internal successors, (708), 9 states have internal predecessors, (708), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:06,254 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:47:06,254 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 4, 1, 1] [2023-11-26 10:47:06,264 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-26 10:47:06,459 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 10:47:06,459 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-26 10:47:06,460 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:47:06,460 INFO L85 PathProgramCache]: Analyzing trace with hash 1163439630, now seen corresponding path program 2 times [2023-11-26 10:47:06,460 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:47:06,461 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1752799977] [2023-11-26 10:47:06,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:47:06,461 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:47:06,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:47:07,140 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 10:47:07,140 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:47:07,141 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1752799977] [2023-11-26 10:47:07,141 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1752799977] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 10:47:07,142 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1856625762] [2023-11-26 10:47:07,142 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-26 10:47:07,142 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 10:47:07,142 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 10:47:07,144 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 10:47:07,164 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-26 10:47:07,295 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-26 10:47:07,295 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-26 10:47:07,297 INFO L262 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 21 conjunts are in the unsatisfiable core [2023-11-26 10:47:07,302 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 10:47:07,322 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 5 [2023-11-26 10:47:07,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-26 10:47:07,335 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-26 10:47:07,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-26 10:47:07,343 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2023-11-26 10:47:07,349 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-26 10:47:07,350 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-26 10:47:07,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-26 10:47:07,358 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2023-11-26 10:47:07,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-26 10:47:07,365 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-26 10:47:07,581 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 10:47:07,581 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 10:47:07,877 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 10:47:07,878 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1856625762] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-26 10:47:07,878 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-26 10:47:07,878 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 16 [2023-11-26 10:47:07,879 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654133811] [2023-11-26 10:47:07,879 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-26 10:47:07,879 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-26 10:47:07,880 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:47:07,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-26 10:47:07,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2023-11-26 10:47:09,978 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 77 out of 139 [2023-11-26 10:47:09,980 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 125 places, 142 transitions, 388 flow. Second operand has 18 states, 18 states have (on average 78.83333333333333) internal successors, (1419), 18 states have internal predecessors, (1419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:09,980 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:47:09,981 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 77 of 139 [2023-11-26 10:47:09,981 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 10:47:11,479 INFO L124 PetriNetUnfolderBase]: 1333/3260 cut-off events. [2023-11-26 10:47:11,480 INFO L125 PetriNetUnfolderBase]: For 132/132 co-relation queries the response was YES. [2023-11-26 10:47:11,488 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5330 conditions, 3260 events. 1333/3260 cut-off events. For 132/132 co-relation queries the response was YES. Maximal size of possible extension queue 119. Compared 23608 event pairs, 701 based on Foata normal form. 16/2483 useless extension candidates. Maximal degree in co-relation 5189. Up to 1910 conditions per place. [2023-11-26 10:47:11,515 INFO L140 encePairwiseOnDemand]: 132/139 looper letters, 78 selfloop transitions, 32 changer transitions 0/182 dead transitions. [2023-11-26 10:47:11,516 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 136 places, 182 transitions, 772 flow [2023-11-26 10:47:11,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-26 10:47:11,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2023-11-26 10:47:11,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 1050 transitions. [2023-11-26 10:47:11,520 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6294964028776978 [2023-11-26 10:47:11,520 INFO L72 ComplementDD]: Start complementDD. Operand 12 states and 1050 transitions. [2023-11-26 10:47:11,521 INFO L73 IsDeterministic]: Start isDeterministic. Operand 12 states and 1050 transitions. [2023-11-26 10:47:11,522 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 10:47:11,522 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 12 states and 1050 transitions. [2023-11-26 10:47:11,526 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 13 states, 12 states have (on average 87.5) internal successors, (1050), 12 states have internal predecessors, (1050), 0 states have call successors, (0), 0 states 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 10:47:11,531 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 13 states, 13 states have (on average 139.0) internal successors, (1807), 13 states have internal predecessors, (1807), 0 states have call successors, (0), 0 states 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 10:47:11,532 INFO L81 ComplementDD]: Finished complementDD. Result has 13 states, 13 states have (on average 139.0) internal successors, (1807), 13 states have internal predecessors, (1807), 0 states have call successors, (0), 0 states 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 10:47:11,532 INFO L175 Difference]: Start difference. First operand has 125 places, 142 transitions, 388 flow. Second operand 12 states and 1050 transitions. [2023-11-26 10:47:11,532 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 136 places, 182 transitions, 772 flow [2023-11-26 10:47:11,540 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 135 places, 182 transitions, 751 flow, removed 6 selfloop flow, removed 1 redundant places. [2023-11-26 10:47:11,544 INFO L231 Difference]: Finished difference. Result has 140 places, 160 transitions, 589 flow [2023-11-26 10:47:11,545 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=344, PETRI_DIFFERENCE_MINUEND_PLACES=124, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=138, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=13, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=125, PETRI_DIFFERENCE_SUBTRAHEND_STATES=12, PETRI_FLOW=589, PETRI_PLACES=140, PETRI_TRANSITIONS=160} [2023-11-26 10:47:11,547 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, 17 predicate places. [2023-11-26 10:47:11,547 INFO L495 AbstractCegarLoop]: Abstraction has has 140 places, 160 transitions, 589 flow [2023-11-26 10:47:11,548 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 78.83333333333333) internal successors, (1419), 18 states have internal predecessors, (1419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:11,548 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:47:11,548 INFO L208 CegarLoopForPetriNet]: trace histogram [6, 5, 1, 1] [2023-11-26 10:47:11,556 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-26 10:47:11,754 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 10:47:11,755 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-26 10:47:11,755 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:47:11,756 INFO L85 PathProgramCache]: Analyzing trace with hash 1374029079, now seen corresponding path program 3 times [2023-11-26 10:47:11,756 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:47:11,756 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1033023764] [2023-11-26 10:47:11,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:47:11,757 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:47:11,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:47:11,903 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 30 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 10:47:11,903 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:47:11,904 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1033023764] [2023-11-26 10:47:11,904 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1033023764] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-26 10:47:11,904 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-26 10:47:11,904 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-26 10:47:11,904 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822990033] [2023-11-26 10:47:11,905 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-26 10:47:11,905 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-26 10:47:11,905 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:47:11,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-26 10:47:11,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2023-11-26 10:47:11,922 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 79 out of 139 [2023-11-26 10:47:11,923 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 140 places, 160 transitions, 589 flow. Second operand has 8 states, 8 states have (on average 80.5) internal successors, (644), 8 states have internal predecessors, (644), 0 states have call successors, (0), 0 states 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 10:47:11,923 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:47:11,923 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 79 of 139 [2023-11-26 10:47:11,923 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 10:47:12,600 INFO L124 PetriNetUnfolderBase]: 1321/3222 cut-off events. [2023-11-26 10:47:12,600 INFO L125 PetriNetUnfolderBase]: For 44/44 co-relation queries the response was YES. [2023-11-26 10:47:12,615 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5207 conditions, 3222 events. 1321/3222 cut-off events. For 44/44 co-relation queries the response was YES. Maximal size of possible extension queue 119. Compared 23481 event pairs, 701 based on Foata normal form. 2/2431 useless extension candidates. Maximal degree in co-relation 5194. Up to 1897 conditions per place. [2023-11-26 10:47:12,635 INFO L140 encePairwiseOnDemand]: 132/139 looper letters, 59 selfloop transitions, 13 changer transitions 0/144 dead transitions. [2023-11-26 10:47:12,636 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 141 places, 144 transitions, 514 flow [2023-11-26 10:47:12,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-26 10:47:12,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2023-11-26 10:47:12,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 706 transitions. [2023-11-26 10:47:12,639 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6348920863309353 [2023-11-26 10:47:12,640 INFO L72 ComplementDD]: Start complementDD. Operand 8 states and 706 transitions. [2023-11-26 10:47:12,640 INFO L73 IsDeterministic]: Start isDeterministic. Operand 8 states and 706 transitions. [2023-11-26 10:47:12,641 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 10:47:12,641 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 8 states and 706 transitions. [2023-11-26 10:47:12,645 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 9 states, 8 states have (on average 88.25) internal successors, (706), 8 states have internal predecessors, (706), 0 states have call successors, (0), 0 states 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 10:47:12,648 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 9 states, 9 states have (on average 139.0) internal successors, (1251), 9 states have internal predecessors, (1251), 0 states have call successors, (0), 0 states 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 10:47:12,649 INFO L81 ComplementDD]: Finished complementDD. Result has 9 states, 9 states have (on average 139.0) internal successors, (1251), 9 states have internal predecessors, (1251), 0 states have call successors, (0), 0 states 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 10:47:12,649 INFO L175 Difference]: Start difference. First operand has 140 places, 160 transitions, 589 flow. Second operand 8 states and 706 transitions. [2023-11-26 10:47:12,649 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 141 places, 144 transitions, 514 flow [2023-11-26 10:47:12,653 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 130 places, 144 transitions, 460 flow, removed 6 selfloop flow, removed 11 redundant places. [2023-11-26 10:47:12,656 INFO L231 Difference]: Finished difference. Result has 131 places, 136 transitions, 334 flow [2023-11-26 10:47:12,657 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=300, PETRI_DIFFERENCE_MINUEND_PLACES=123, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=136, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=13, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=123, PETRI_DIFFERENCE_SUBTRAHEND_STATES=8, PETRI_FLOW=334, PETRI_PLACES=131, PETRI_TRANSITIONS=136} [2023-11-26 10:47:12,660 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, 8 predicate places. [2023-11-26 10:47:12,661 INFO L495 AbstractCegarLoop]: Abstraction has has 131 places, 136 transitions, 334 flow [2023-11-26 10:47:12,661 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 80.5) internal successors, (644), 8 states have internal predecessors, (644), 0 states have call successors, (0), 0 states 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 10:47:12,661 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:47:12,661 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1] [2023-11-26 10:47:12,662 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-26 10:47:12,662 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-26 10:47:12,662 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:47:12,663 INFO L85 PathProgramCache]: Analyzing trace with hash -1779886498, now seen corresponding path program 1 times [2023-11-26 10:47:12,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:47:12,663 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404760752] [2023-11-26 10:47:12,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:47:12,663 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:47:12,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:47:12,967 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-11-26 10:47:12,968 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:47:12,968 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404760752] [2023-11-26 10:47:12,968 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [404760752] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-26 10:47:12,968 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-26 10:47:12,968 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-26 10:47:12,969 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512050830] [2023-11-26 10:47:12,969 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-26 10:47:12,969 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-26 10:47:12,970 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:47:12,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-26 10:47:12,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2023-11-26 10:47:13,070 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 73 out of 139 [2023-11-26 10:47:13,071 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 131 places, 136 transitions, 334 flow. Second operand has 5 states, 5 states have (on average 75.0) internal successors, (375), 5 states have internal predecessors, (375), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:13,071 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:47:13,071 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 73 of 139 [2023-11-26 10:47:13,071 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 10:47:13,902 INFO L124 PetriNetUnfolderBase]: 2082/4848 cut-off events. [2023-11-26 10:47:13,902 INFO L125 PetriNetUnfolderBase]: For 23/23 co-relation queries the response was YES. [2023-11-26 10:47:13,915 INFO L83 FinitePrefix]: Finished finitePrefix Result has 7854 conditions, 4848 events. 2082/4848 cut-off events. For 23/23 co-relation queries the response was YES. Maximal size of possible extension queue 176. Compared 37497 event pairs, 1164 based on Foata normal form. 0/3697 useless extension candidates. Maximal degree in co-relation 7846. Up to 2924 conditions per place. [2023-11-26 10:47:13,942 INFO L140 encePairwiseOnDemand]: 135/139 looper letters, 64 selfloop transitions, 2 changer transitions 0/134 dead transitions. [2023-11-26 10:47:13,942 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 132 places, 134 transitions, 462 flow [2023-11-26 10:47:13,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-26 10:47:13,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-11-26 10:47:13,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 352 transitions. [2023-11-26 10:47:13,945 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6330935251798561 [2023-11-26 10:47:13,945 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 352 transitions. [2023-11-26 10:47:13,946 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 352 transitions. [2023-11-26 10:47:13,946 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 10:47:13,946 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 352 transitions. [2023-11-26 10:47:13,948 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 88.0) internal successors, (352), 4 states have internal predecessors, (352), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:13,950 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 139.0) internal successors, (695), 5 states have internal predecessors, (695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:13,951 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 139.0) internal successors, (695), 5 states have internal predecessors, (695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:13,951 INFO L175 Difference]: Start difference. First operand has 131 places, 136 transitions, 334 flow. Second operand 4 states and 352 transitions. [2023-11-26 10:47:13,951 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 132 places, 134 transitions, 462 flow [2023-11-26 10:47:13,954 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 125 places, 134 transitions, 436 flow, removed 0 selfloop flow, removed 7 redundant places. [2023-11-26 10:47:13,957 INFO L231 Difference]: Finished difference. Result has 125 places, 134 transitions, 308 flow [2023-11-26 10:47:13,957 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=304, PETRI_DIFFERENCE_MINUEND_PLACES=122, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=134, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=132, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=308, PETRI_PLACES=125, PETRI_TRANSITIONS=134} [2023-11-26 10:47:13,958 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, 2 predicate places. [2023-11-26 10:47:13,959 INFO L495 AbstractCegarLoop]: Abstraction has has 125 places, 134 transitions, 308 flow [2023-11-26 10:47:13,959 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 75.0) internal successors, (375), 5 states have internal predecessors, (375), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:13,959 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:47:13,960 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1] [2023-11-26 10:47:13,960 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-26 10:47:13,960 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-26 10:47:13,961 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:47:13,961 INFO L85 PathProgramCache]: Analyzing trace with hash -1779886497, now seen corresponding path program 1 times [2023-11-26 10:47:13,961 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:47:13,961 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1960908370] [2023-11-26 10:47:13,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:47:13,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:47:14,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:47:14,458 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-11-26 10:47:14,458 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:47:14,458 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1960908370] [2023-11-26 10:47:14,459 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1960908370] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-26 10:47:14,459 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-26 10:47:14,459 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-26 10:47:14,459 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751426504] [2023-11-26 10:47:14,459 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-26 10:47:14,461 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-26 10:47:14,462 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:47:14,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-26 10:47:14,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-26 10:47:14,553 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 77 out of 139 [2023-11-26 10:47:14,554 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 125 places, 134 transitions, 308 flow. Second operand has 4 states, 4 states have (on average 79.0) internal successors, (316), 4 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:14,554 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:47:14,554 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 77 of 139 [2023-11-26 10:47:14,554 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 10:47:15,100 INFO L124 PetriNetUnfolderBase]: 1321/3206 cut-off events. [2023-11-26 10:47:15,100 INFO L125 PetriNetUnfolderBase]: For 14/14 co-relation queries the response was YES. [2023-11-26 10:47:15,109 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5173 conditions, 3206 events. 1321/3206 cut-off events. For 14/14 co-relation queries the response was YES. Maximal size of possible extension queue 120. Compared 23341 event pairs, 701 based on Foata normal form. 266/2695 useless extension candidates. Maximal degree in co-relation 5165. Up to 1896 conditions per place. [2023-11-26 10:47:15,124 INFO L140 encePairwiseOnDemand]: 135/139 looper letters, 62 selfloop transitions, 2 changer transitions 0/132 dead transitions. [2023-11-26 10:47:15,124 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 126 places, 132 transitions, 432 flow [2023-11-26 10:47:15,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-26 10:47:15,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-11-26 10:47:15,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 366 transitions. [2023-11-26 10:47:15,127 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.658273381294964 [2023-11-26 10:47:15,127 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 366 transitions. [2023-11-26 10:47:15,127 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 366 transitions. [2023-11-26 10:47:15,128 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 10:47:15,128 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 366 transitions. [2023-11-26 10:47:15,130 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 91.5) internal successors, (366), 4 states have internal predecessors, (366), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:15,131 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 139.0) internal successors, (695), 5 states have internal predecessors, (695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:15,133 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 139.0) internal successors, (695), 5 states have internal predecessors, (695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:15,133 INFO L175 Difference]: Start difference. First operand has 125 places, 134 transitions, 308 flow. Second operand 4 states and 366 transitions. [2023-11-26 10:47:15,133 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 126 places, 132 transitions, 432 flow [2023-11-26 10:47:15,135 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 124 places, 132 transitions, 429 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-11-26 10:47:15,137 INFO L231 Difference]: Finished difference. Result has 124 places, 132 transitions, 305 flow [2023-11-26 10:47:15,138 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=301, PETRI_DIFFERENCE_MINUEND_PLACES=121, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=132, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=130, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=305, PETRI_PLACES=124, PETRI_TRANSITIONS=132} [2023-11-26 10:47:15,139 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, 1 predicate places. [2023-11-26 10:47:15,139 INFO L495 AbstractCegarLoop]: Abstraction has has 124 places, 132 transitions, 305 flow [2023-11-26 10:47:15,140 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 79.0) internal successors, (316), 4 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:15,140 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:47:15,140 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 10:47:15,140 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-26 10:47:15,141 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-26 10:47:15,151 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:47:15,152 INFO L85 PathProgramCache]: Analyzing trace with hash 1069008651, now seen corresponding path program 1 times [2023-11-26 10:47:15,152 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:47:15,152 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [189964148] [2023-11-26 10:47:15,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:47:15,153 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:47:15,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:47:15,430 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-11-26 10:47:15,430 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:47:15,430 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [189964148] [2023-11-26 10:47:15,430 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [189964148] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-26 10:47:15,430 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-26 10:47:15,431 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-26 10:47:15,431 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413660769] [2023-11-26 10:47:15,431 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-26 10:47:15,431 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-26 10:47:15,432 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:47:15,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-26 10:47:15,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2023-11-26 10:47:15,547 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 73 out of 139 [2023-11-26 10:47:15,548 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 124 places, 132 transitions, 305 flow. Second operand has 5 states, 5 states have (on average 75.4) internal successors, (377), 5 states have internal predecessors, (377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:15,548 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:47:15,548 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 73 of 139 [2023-11-26 10:47:15,548 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 10:47:16,123 INFO L124 PetriNetUnfolderBase]: 1363/3327 cut-off events. [2023-11-26 10:47:16,123 INFO L125 PetriNetUnfolderBase]: For 14/14 co-relation queries the response was YES. [2023-11-26 10:47:16,133 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5365 conditions, 3327 events. 1363/3327 cut-off events. For 14/14 co-relation queries the response was YES. Maximal size of possible extension queue 123. Compared 24512 event pairs, 727 based on Foata normal form. 0/2522 useless extension candidates. Maximal degree in co-relation 5357. Up to 1966 conditions per place. [2023-11-26 10:47:16,149 INFO L140 encePairwiseOnDemand]: 135/139 looper letters, 64 selfloop transitions, 2 changer transitions 0/130 dead transitions. [2023-11-26 10:47:16,150 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 125 places, 130 transitions, 433 flow [2023-11-26 10:47:16,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-26 10:47:16,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-11-26 10:47:16,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 352 transitions. [2023-11-26 10:47:16,153 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6330935251798561 [2023-11-26 10:47:16,153 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 352 transitions. [2023-11-26 10:47:16,153 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 352 transitions. [2023-11-26 10:47:16,154 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 10:47:16,154 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 352 transitions. [2023-11-26 10:47:16,156 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 88.0) internal successors, (352), 4 states have internal predecessors, (352), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:16,158 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 139.0) internal successors, (695), 5 states have internal predecessors, (695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:16,158 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 139.0) internal successors, (695), 5 states have internal predecessors, (695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:16,159 INFO L175 Difference]: Start difference. First operand has 124 places, 132 transitions, 305 flow. Second operand 4 states and 352 transitions. [2023-11-26 10:47:16,159 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 125 places, 130 transitions, 433 flow [2023-11-26 10:47:16,161 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 123 places, 130 transitions, 430 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-11-26 10:47:16,163 INFO L231 Difference]: Finished difference. Result has 123 places, 130 transitions, 302 flow [2023-11-26 10:47:16,164 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=298, PETRI_DIFFERENCE_MINUEND_PLACES=120, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=130, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=128, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=302, PETRI_PLACES=123, PETRI_TRANSITIONS=130} [2023-11-26 10:47:16,167 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, 0 predicate places. [2023-11-26 10:47:16,167 INFO L495 AbstractCegarLoop]: Abstraction has has 123 places, 130 transitions, 302 flow [2023-11-26 10:47:16,168 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 75.4) internal successors, (377), 5 states have internal predecessors, (377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:16,169 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:47:16,169 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 10:47:16,169 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-26 10:47:16,170 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-26 10:47:16,170 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:47:16,170 INFO L85 PathProgramCache]: Analyzing trace with hash 1069008652, now seen corresponding path program 1 times [2023-11-26 10:47:16,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:47:16,171 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1744050613] [2023-11-26 10:47:16,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:47:16,171 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:47:16,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:47:16,808 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-26 10:47:16,808 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:47:16,808 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1744050613] [2023-11-26 10:47:16,808 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1744050613] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 10:47:16,809 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1144746716] [2023-11-26 10:47:16,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:47:16,809 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 10:47:16,809 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 10:47:16,810 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 10:47:16,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-26 10:47:16,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:47:16,967 INFO L262 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-26 10:47:16,970 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 10:47:16,994 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-26 10:47:17,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-26 10:47:17,091 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-26 10:47:17,144 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-11-26 10:47:17,144 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-26 10:47:17,144 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1144746716] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-26 10:47:17,144 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-26 10:47:17,145 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2023-11-26 10:47:17,145 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705766577] [2023-11-26 10:47:17,145 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-26 10:47:17,145 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-26 10:47:17,146 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:47:17,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-26 10:47:17,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2023-11-26 10:47:17,233 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 77 out of 139 [2023-11-26 10:47:17,234 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 123 places, 130 transitions, 302 flow. Second operand has 4 states, 4 states have (on average 79.5) internal successors, (318), 4 states have internal predecessors, (318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:17,234 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:47:17,234 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 77 of 139 [2023-11-26 10:47:17,235 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 10:47:17,793 INFO L124 PetriNetUnfolderBase]: 1321/3202 cut-off events. [2023-11-26 10:47:17,793 INFO L125 PetriNetUnfolderBase]: For 14/14 co-relation queries the response was YES. [2023-11-26 10:47:17,805 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5171 conditions, 3202 events. 1321/3202 cut-off events. For 14/14 co-relation queries the response was YES. Maximal size of possible extension queue 120. Compared 23265 event pairs, 701 based on Foata normal form. 27/2456 useless extension candidates. Maximal degree in co-relation 5163. Up to 1918 conditions per place. [2023-11-26 10:47:17,821 INFO L140 encePairwiseOnDemand]: 136/139 looper letters, 63 selfloop transitions, 1 changer transitions 0/128 dead transitions. [2023-11-26 10:47:17,822 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 123 places, 128 transitions, 426 flow [2023-11-26 10:47:17,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-26 10:47:17,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-26 10:47:17,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 289 transitions. [2023-11-26 10:47:17,824 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6930455635491607 [2023-11-26 10:47:17,824 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 289 transitions. [2023-11-26 10:47:17,824 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 289 transitions. [2023-11-26 10:47:17,825 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 10:47:17,825 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 289 transitions. [2023-11-26 10:47:17,826 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 96.33333333333333) internal successors, (289), 3 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:17,828 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 139.0) internal successors, (556), 4 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:17,828 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 139.0) internal successors, (556), 4 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:17,829 INFO L175 Difference]: Start difference. First operand has 123 places, 130 transitions, 302 flow. Second operand 3 states and 289 transitions. [2023-11-26 10:47:17,829 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 123 places, 128 transitions, 426 flow [2023-11-26 10:47:17,830 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 121 places, 128 transitions, 423 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-11-26 10:47:17,833 INFO L231 Difference]: Finished difference. Result has 121 places, 128 transitions, 297 flow [2023-11-26 10:47:17,834 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=295, PETRI_DIFFERENCE_MINUEND_PLACES=119, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=128, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=127, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=297, PETRI_PLACES=121, PETRI_TRANSITIONS=128} [2023-11-26 10:47:17,835 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, -2 predicate places. [2023-11-26 10:47:17,835 INFO L495 AbstractCegarLoop]: Abstraction has has 121 places, 128 transitions, 297 flow [2023-11-26 10:47:17,836 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 79.5) internal successors, (318), 4 states have internal predecessors, (318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:17,836 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:47:17,836 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 10:47:17,848 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-26 10:47:18,042 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 10:47:18,044 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-26 10:47:18,044 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:47:18,044 INFO L85 PathProgramCache]: Analyzing trace with hash -332046149, now seen corresponding path program 1 times [2023-11-26 10:47:18,044 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:47:18,045 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [948484867] [2023-11-26 10:47:18,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:47:18,045 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:47:18,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:47:18,433 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-11-26 10:47:18,434 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:47:18,434 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [948484867] [2023-11-26 10:47:18,434 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [948484867] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 10:47:18,435 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [352731626] [2023-11-26 10:47:18,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:47:18,435 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 10:47:18,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 10:47:18,437 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 10:47:18,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-26 10:47:18,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:47:18,620 INFO L262 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-26 10:47:18,624 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 10:47:18,646 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 5 [2023-11-26 10:47:18,654 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-26 10:47:18,654 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2023-11-26 10:47:18,671 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-26 10:47:18,671 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-26 10:47:18,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-26 10:47:18,688 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 1 [2023-11-26 10:47:18,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-26 10:47:18,695 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2023-11-26 10:47:18,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-26 10:47:18,702 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-26 10:47:18,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-26 10:47:18,872 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-26 10:47:18,887 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-26 10:47:18,888 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-26 10:47:18,999 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-26 10:47:18,999 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 10:47:19,205 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 50 treesize of output 46 [2023-11-26 10:47:19,598 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-26 10:47:19,599 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [352731626] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-26 10:47:19,599 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-26 10:47:19,599 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 8, 8] total 21 [2023-11-26 10:47:19,599 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216325814] [2023-11-26 10:47:19,600 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-26 10:47:19,600 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-26 10:47:19,601 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:47:19,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-26 10:47:19,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=405, Unknown=0, NotChecked=0, Total=506 [2023-11-26 10:47:23,383 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 73 out of 139 [2023-11-26 10:47:23,385 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 121 places, 128 transitions, 297 flow. Second operand has 23 states, 23 states have (on average 75.3913043478261) internal successors, (1734), 23 states have internal predecessors, (1734), 0 states have call successors, (0), 0 states 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 10:47:23,385 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:47:23,385 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 73 of 139 [2023-11-26 10:47:23,386 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 10:47:25,259 INFO L124 PetriNetUnfolderBase]: 3012/6750 cut-off events. [2023-11-26 10:47:25,259 INFO L125 PetriNetUnfolderBase]: For 22/22 co-relation queries the response was YES. [2023-11-26 10:47:25,280 INFO L83 FinitePrefix]: Finished finitePrefix Result has 11246 conditions, 6750 events. 3012/6750 cut-off events. For 22/22 co-relation queries the response was YES. Maximal size of possible extension queue 132. Compared 49676 event pairs, 464 based on Foata normal form. 0/5510 useless extension candidates. Maximal degree in co-relation 11238. Up to 1873 conditions per place. [2023-11-26 10:47:25,315 INFO L140 encePairwiseOnDemand]: 127/139 looper letters, 135 selfloop transitions, 15 changer transitions 0/210 dead transitions. [2023-11-26 10:47:25,315 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 132 places, 210 transitions, 783 flow [2023-11-26 10:47:25,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-26 10:47:25,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2023-11-26 10:47:25,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 1253 transitions. [2023-11-26 10:47:25,322 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6009592326139088 [2023-11-26 10:47:25,322 INFO L72 ComplementDD]: Start complementDD. Operand 15 states and 1253 transitions. [2023-11-26 10:47:25,322 INFO L73 IsDeterministic]: Start isDeterministic. Operand 15 states and 1253 transitions. [2023-11-26 10:47:25,324 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 10:47:25,324 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 15 states and 1253 transitions. [2023-11-26 10:47:25,328 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 16 states, 15 states have (on average 83.53333333333333) internal successors, (1253), 15 states have internal predecessors, (1253), 0 states have call successors, (0), 0 states 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 10:47:25,334 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 16 states, 16 states have (on average 139.0) internal successors, (2224), 16 states have internal predecessors, (2224), 0 states have call successors, (0), 0 states 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 10:47:25,336 INFO L81 ComplementDD]: Finished complementDD. Result has 16 states, 16 states have (on average 139.0) internal successors, (2224), 16 states have internal predecessors, (2224), 0 states have call successors, (0), 0 states 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 10:47:25,336 INFO L175 Difference]: Start difference. First operand has 121 places, 128 transitions, 297 flow. Second operand 15 states and 1253 transitions. [2023-11-26 10:47:25,336 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 132 places, 210 transitions, 783 flow [2023-11-26 10:47:25,339 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 131 places, 210 transitions, 782 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-11-26 10:47:25,343 INFO L231 Difference]: Finished difference. Result has 134 places, 127 transitions, 339 flow [2023-11-26 10:47:25,343 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=290, PETRI_DIFFERENCE_MINUEND_PLACES=117, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=125, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=13, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=111, PETRI_DIFFERENCE_SUBTRAHEND_STATES=15, PETRI_FLOW=339, PETRI_PLACES=134, PETRI_TRANSITIONS=127} [2023-11-26 10:47:25,344 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, 11 predicate places. [2023-11-26 10:47:25,344 INFO L495 AbstractCegarLoop]: Abstraction has has 134 places, 127 transitions, 339 flow [2023-11-26 10:47:25,346 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 75.3913043478261) internal successors, (1734), 23 states have internal predecessors, (1734), 0 states have call successors, (0), 0 states 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 10:47:25,346 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:47:25,346 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 10:47:25,362 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-26 10:47:25,553 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 10:47:25,553 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-26 10:47:25,553 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:47:25,553 INFO L85 PathProgramCache]: Analyzing trace with hash -332046150, now seen corresponding path program 1 times [2023-11-26 10:47:25,553 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:47:25,553 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1951760386] [2023-11-26 10:47:25,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:47:25,554 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:47:25,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:47:25,710 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-11-26 10:47:25,711 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:47:25,711 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1951760386] [2023-11-26 10:47:25,711 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1951760386] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-26 10:47:25,711 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-26 10:47:25,712 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-26 10:47:25,712 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573220508] [2023-11-26 10:47:25,712 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-26 10:47:25,712 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-26 10:47:25,713 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:47:25,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-26 10:47:25,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-26 10:47:25,894 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 69 out of 139 [2023-11-26 10:47:25,895 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 134 places, 127 transitions, 339 flow. Second operand has 5 states, 5 states have (on average 71.8) internal successors, (359), 5 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:25,895 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:47:25,895 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 69 of 139 [2023-11-26 10:47:25,895 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 10:47:26,771 INFO L124 PetriNetUnfolderBase]: 2847/6338 cut-off events. [2023-11-26 10:47:26,771 INFO L125 PetriNetUnfolderBase]: For 524/534 co-relation queries the response was YES. [2023-11-26 10:47:26,791 INFO L83 FinitePrefix]: Finished finitePrefix Result has 11012 conditions, 6338 events. 2847/6338 cut-off events. For 524/534 co-relation queries the response was YES. Maximal size of possible extension queue 130. Compared 45890 event pairs, 1601 based on Foata normal form. 94/5244 useless extension candidates. Maximal degree in co-relation 11001. Up to 4128 conditions per place. [2023-11-26 10:47:26,820 INFO L140 encePairwiseOnDemand]: 128/139 looper letters, 63 selfloop transitions, 3 changer transitions 0/119 dead transitions. [2023-11-26 10:47:26,820 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 130 places, 119 transitions, 455 flow [2023-11-26 10:47:26,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-26 10:47:26,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-11-26 10:47:26,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 409 transitions. [2023-11-26 10:47:26,822 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5884892086330935 [2023-11-26 10:47:26,823 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 409 transitions. [2023-11-26 10:47:26,823 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 409 transitions. [2023-11-26 10:47:26,823 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 10:47:26,823 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 409 transitions. [2023-11-26 10:47:26,825 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 81.8) internal successors, (409), 5 states have internal predecessors, (409), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:26,826 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 139.0) internal successors, (834), 6 states have internal predecessors, (834), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:26,827 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 139.0) internal successors, (834), 6 states have internal predecessors, (834), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:26,827 INFO L175 Difference]: Start difference. First operand has 134 places, 127 transitions, 339 flow. Second operand 5 states and 409 transitions. [2023-11-26 10:47:26,827 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 130 places, 119 transitions, 455 flow [2023-11-26 10:47:26,829 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 125 places, 119 transitions, 438 flow, removed 0 selfloop flow, removed 5 redundant places. [2023-11-26 10:47:26,832 INFO L231 Difference]: Finished difference. Result has 125 places, 119 transitions, 312 flow [2023-11-26 10:47:26,832 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=306, PETRI_DIFFERENCE_MINUEND_PLACES=121, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=119, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=116, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=312, PETRI_PLACES=125, PETRI_TRANSITIONS=119} [2023-11-26 10:47:26,833 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, 2 predicate places. [2023-11-26 10:47:26,833 INFO L495 AbstractCegarLoop]: Abstraction has has 125 places, 119 transitions, 312 flow [2023-11-26 10:47:26,833 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 71.8) internal successors, (359), 5 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:26,833 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:47:26,834 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 10:47:26,834 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-26 10:47:26,834 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-26 10:47:26,834 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:47:26,835 INFO L85 PathProgramCache]: Analyzing trace with hash -1268723938, now seen corresponding path program 1 times [2023-11-26 10:47:26,835 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:47:26,835 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443947105] [2023-11-26 10:47:26,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:47:26,835 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:47:26,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:47:26,928 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-11-26 10:47:26,929 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:47:26,929 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1443947105] [2023-11-26 10:47:26,929 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1443947105] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-26 10:47:26,929 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-26 10:47:26,929 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-26 10:47:26,929 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563856944] [2023-11-26 10:47:26,930 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-26 10:47:26,930 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-26 10:47:26,930 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:47:26,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-26 10:47:26,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-26 10:47:27,031 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 69 out of 139 [2023-11-26 10:47:27,032 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 125 places, 119 transitions, 312 flow. Second operand has 4 states, 4 states have (on average 72.75) internal successors, (291), 4 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:27,032 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:47:27,032 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 69 of 139 [2023-11-26 10:47:27,032 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 10:47:27,926 INFO L124 PetriNetUnfolderBase]: 2847/6012 cut-off events. [2023-11-26 10:47:27,927 INFO L125 PetriNetUnfolderBase]: For 519/529 co-relation queries the response was YES. [2023-11-26 10:47:27,943 INFO L83 FinitePrefix]: Finished finitePrefix Result has 10681 conditions, 6012 events. 2847/6012 cut-off events. For 519/529 co-relation queries the response was YES. Maximal size of possible extension queue 117. Compared 41229 event pairs, 1601 based on Foata normal form. 0/5150 useless extension candidates. Maximal degree in co-relation 10670. Up to 4128 conditions per place. [2023-11-26 10:47:27,967 INFO L140 encePairwiseOnDemand]: 129/139 looper letters, 64 selfloop transitions, 2 changer transitions 0/111 dead transitions. [2023-11-26 10:47:27,967 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 120 places, 111 transitions, 428 flow [2023-11-26 10:47:27,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-26 10:47:27,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-11-26 10:47:27,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 340 transitions. [2023-11-26 10:47:27,969 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6115107913669064 [2023-11-26 10:47:27,970 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 340 transitions. [2023-11-26 10:47:27,970 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 340 transitions. [2023-11-26 10:47:27,970 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 10:47:27,970 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 340 transitions. [2023-11-26 10:47:27,971 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 85.0) internal successors, (340), 4 states have internal predecessors, (340), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:27,973 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 139.0) internal successors, (695), 5 states have internal predecessors, (695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:27,973 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 139.0) internal successors, (695), 5 states have internal predecessors, (695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:27,973 INFO L175 Difference]: Start difference. First operand has 125 places, 119 transitions, 312 flow. Second operand 4 states and 340 transitions. [2023-11-26 10:47:27,974 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 120 places, 111 transitions, 428 flow [2023-11-26 10:47:27,976 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 117 places, 111 transitions, 423 flow, removed 0 selfloop flow, removed 3 redundant places. [2023-11-26 10:47:27,978 INFO L231 Difference]: Finished difference. Result has 117 places, 111 transitions, 295 flow [2023-11-26 10:47:27,978 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=291, PETRI_DIFFERENCE_MINUEND_PLACES=114, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=111, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=109, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=295, PETRI_PLACES=117, PETRI_TRANSITIONS=111} [2023-11-26 10:47:27,979 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, -6 predicate places. [2023-11-26 10:47:27,980 INFO L495 AbstractCegarLoop]: Abstraction has has 117 places, 111 transitions, 295 flow [2023-11-26 10:47:27,980 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 72.75) internal successors, (291), 4 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:27,980 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:47:27,980 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 10:47:27,981 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-11-26 10:47:27,983 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-26 10:47:27,983 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:47:27,983 INFO L85 PathProgramCache]: Analyzing trace with hash -1268723937, now seen corresponding path program 1 times [2023-11-26 10:47:27,984 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:47:27,984 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [701288400] [2023-11-26 10:47:27,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:47:27,984 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:47:28,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:47:28,341 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-26 10:47:28,342 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:47:28,342 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [701288400] [2023-11-26 10:47:28,342 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [701288400] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 10:47:28,342 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1526581] [2023-11-26 10:47:28,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:47:28,342 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 10:47:28,343 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 10:47:28,345 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 10:47:28,368 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-26 10:47:28,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:47:28,512 INFO L262 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 18 conjunts are in the unsatisfiable core [2023-11-26 10:47:28,514 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 10:47:28,719 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-26 10:47:28,720 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 10:47:28,819 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2023-11-26 10:47:28,947 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-26 10:47:28,947 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1526581] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-26 10:47:28,948 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-26 10:47:28,948 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 9, 9] total 20 [2023-11-26 10:47:28,948 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304935547] [2023-11-26 10:47:28,948 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-26 10:47:28,950 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-11-26 10:47:28,951 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:47:28,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-11-26 10:47:28,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=333, Unknown=0, NotChecked=0, Total=420 [2023-11-26 10:47:30,503 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 75 out of 139 [2023-11-26 10:47:30,505 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 117 places, 111 transitions, 295 flow. Second operand has 21 states, 21 states have (on average 77.33333333333333) internal successors, (1624), 21 states have internal predecessors, (1624), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:30,505 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:47:30,505 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 75 of 139 [2023-11-26 10:47:30,506 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 10:47:32,140 INFO L124 PetriNetUnfolderBase]: 4036/7690 cut-off events. [2023-11-26 10:47:32,141 INFO L125 PetriNetUnfolderBase]: For 623/648 co-relation queries the response was YES. [2023-11-26 10:47:32,177 INFO L83 FinitePrefix]: Finished finitePrefix Result has 14135 conditions, 7690 events. 4036/7690 cut-off events. For 623/648 co-relation queries the response was YES. Maximal size of possible extension queue 107. Compared 48470 event pairs, 1064 based on Foata normal form. 0/6470 useless extension candidates. Maximal degree in co-relation 14124. Up to 2079 conditions per place. [2023-11-26 10:47:32,208 INFO L140 encePairwiseOnDemand]: 124/139 looper letters, 148 selfloop transitions, 18 changer transitions 0/207 dead transitions. [2023-11-26 10:47:32,208 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 126 places, 207 transitions, 847 flow [2023-11-26 10:47:32,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-26 10:47:32,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2023-11-26 10:47:32,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 924 transitions. [2023-11-26 10:47:32,212 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6647482014388489 [2023-11-26 10:47:32,213 INFO L72 ComplementDD]: Start complementDD. Operand 10 states and 924 transitions. [2023-11-26 10:47:32,213 INFO L73 IsDeterministic]: Start isDeterministic. Operand 10 states and 924 transitions. [2023-11-26 10:47:32,214 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 10:47:32,214 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 10 states and 924 transitions. [2023-11-26 10:47:32,217 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 11 states, 10 states have (on average 92.4) internal successors, (924), 10 states have internal predecessors, (924), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:32,220 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 11 states, 11 states have (on average 139.0) internal successors, (1529), 11 states have internal predecessors, (1529), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:32,221 INFO L81 ComplementDD]: Finished complementDD. Result has 11 states, 11 states have (on average 139.0) internal successors, (1529), 11 states have internal predecessors, (1529), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:32,221 INFO L175 Difference]: Start difference. First operand has 117 places, 111 transitions, 295 flow. Second operand 10 states and 924 transitions. [2023-11-26 10:47:32,221 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 126 places, 207 transitions, 847 flow [2023-11-26 10:47:32,225 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 124 places, 207 transitions, 844 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-11-26 10:47:32,228 INFO L231 Difference]: Finished difference. Result has 127 places, 116 transitions, 383 flow [2023-11-26 10:47:32,229 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=292, PETRI_DIFFERENCE_MINUEND_PLACES=115, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=111, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=13, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=93, PETRI_DIFFERENCE_SUBTRAHEND_STATES=10, PETRI_FLOW=383, PETRI_PLACES=127, PETRI_TRANSITIONS=116} [2023-11-26 10:47:32,229 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, 4 predicate places. [2023-11-26 10:47:32,230 INFO L495 AbstractCegarLoop]: Abstraction has has 127 places, 116 transitions, 383 flow [2023-11-26 10:47:32,231 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 77.33333333333333) internal successors, (1624), 21 states have internal predecessors, (1624), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:32,231 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:47:32,231 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 10:47:32,245 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-11-26 10:47:32,445 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-11-26 10:47:32,445 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-26 10:47:32,446 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:47:32,446 INFO L85 PathProgramCache]: Analyzing trace with hash -1842974631, now seen corresponding path program 1 times [2023-11-26 10:47:32,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:47:32,446 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [883388944] [2023-11-26 10:47:32,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:47:32,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:47:32,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:47:32,844 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-26 10:47:32,845 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:47:32,845 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [883388944] [2023-11-26 10:47:32,845 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [883388944] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 10:47:32,845 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2006880625] [2023-11-26 10:47:32,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:47:32,846 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 10:47:32,846 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 10:47:32,847 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 10:47:32,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-26 10:47:33,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:47:33,023 INFO L262 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 18 conjunts are in the unsatisfiable core [2023-11-26 10:47:33,026 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 10:47:33,227 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-26 10:47:33,227 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 10:47:33,330 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2023-11-26 10:47:33,455 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-26 10:47:33,455 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2006880625] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-26 10:47:33,455 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-26 10:47:33,456 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 9, 9] total 20 [2023-11-26 10:47:33,456 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2052346263] [2023-11-26 10:47:33,456 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-26 10:47:33,456 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-11-26 10:47:33,457 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:47:33,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-11-26 10:47:33,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=333, Unknown=0, NotChecked=0, Total=420 [2023-11-26 10:47:34,810 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 75 out of 139 [2023-11-26 10:47:34,812 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 127 places, 116 transitions, 383 flow. Second operand has 21 states, 21 states have (on average 77.47619047619048) internal successors, (1627), 21 states have internal predecessors, (1627), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:34,812 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:47:34,812 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 75 of 139 [2023-11-26 10:47:34,812 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 10:47:37,527 INFO L124 PetriNetUnfolderBase]: 7683/15142 cut-off events. [2023-11-26 10:47:37,527 INFO L125 PetriNetUnfolderBase]: For 5191/5469 co-relation queries the response was YES. [2023-11-26 10:47:37,593 INFO L83 FinitePrefix]: Finished finitePrefix Result has 29383 conditions, 15142 events. 7683/15142 cut-off events. For 5191/5469 co-relation queries the response was YES. Maximal size of possible extension queue 230. Compared 110544 event pairs, 1239 based on Foata normal form. 0/13061 useless extension candidates. Maximal degree in co-relation 29369. Up to 4614 conditions per place. [2023-11-26 10:47:37,659 INFO L140 encePairwiseOnDemand]: 127/139 looper letters, 152 selfloop transitions, 15 changer transitions 0/208 dead transitions. [2023-11-26 10:47:37,659 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 133 places, 208 transitions, 1041 flow [2023-11-26 10:47:37,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-26 10:47:37,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2023-11-26 10:47:37,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 904 transitions. [2023-11-26 10:47:37,664 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6503597122302158 [2023-11-26 10:47:37,664 INFO L72 ComplementDD]: Start complementDD. Operand 10 states and 904 transitions. [2023-11-26 10:47:37,664 INFO L73 IsDeterministic]: Start isDeterministic. Operand 10 states and 904 transitions. [2023-11-26 10:47:37,665 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 10:47:37,665 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 10 states and 904 transitions. [2023-11-26 10:47:37,667 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 11 states, 10 states have (on average 90.4) internal successors, (904), 10 states have internal predecessors, (904), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:37,671 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 11 states, 11 states have (on average 139.0) internal successors, (1529), 11 states have internal predecessors, (1529), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:37,672 INFO L81 ComplementDD]: Finished complementDD. Result has 11 states, 11 states have (on average 139.0) internal successors, (1529), 11 states have internal predecessors, (1529), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:37,672 INFO L175 Difference]: Start difference. First operand has 127 places, 116 transitions, 383 flow. Second operand 10 states and 904 transitions. [2023-11-26 10:47:37,672 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 133 places, 208 transitions, 1041 flow [2023-11-26 10:47:37,679 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 126 places, 208 transitions, 1014 flow, removed 0 selfloop flow, removed 7 redundant places. [2023-11-26 10:47:37,683 INFO L231 Difference]: Finished difference. Result has 129 places, 115 transitions, 403 flow [2023-11-26 10:47:37,684 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=139, PETRI_DIFFERENCE_MINUEND_FLOW=354, PETRI_DIFFERENCE_MINUEND_PLACES=117, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=113, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=13, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=99, PETRI_DIFFERENCE_SUBTRAHEND_STATES=10, PETRI_FLOW=403, PETRI_PLACES=129, PETRI_TRANSITIONS=115} [2023-11-26 10:47:37,684 INFO L281 CegarLoopForPetriNet]: 123 programPoint places, 6 predicate places. [2023-11-26 10:47:37,685 INFO L495 AbstractCegarLoop]: Abstraction has has 129 places, 115 transitions, 403 flow [2023-11-26 10:47:37,686 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 77.47619047619048) internal successors, (1627), 21 states have internal predecessors, (1627), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:37,686 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:47:37,686 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 10:47:37,697 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-26 10:47:37,892 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-11-26 10:47:37,892 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting thread2Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 77 more)] === [2023-11-26 10:47:37,893 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:47:37,893 INFO L85 PathProgramCache]: Analyzing trace with hash -1572047459, now seen corresponding path program 1 times [2023-11-26 10:47:37,893 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:47:37,893 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [161744309] [2023-11-26 10:47:37,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:47:37,893 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:47:37,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:47:38,373 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-11-26 10:47:38,373 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:47:38,373 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [161744309] [2023-11-26 10:47:38,374 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [161744309] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 10:47:38,374 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [812318962] [2023-11-26 10:47:38,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:47:38,374 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 10:47:38,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 10:47:38,375 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 10:47:38,392 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fab5cc7a-5c69-4bef-b47f-51d2bc49483d/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-26 10:47:38,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:47:38,552 INFO L262 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 33 conjunts are in the unsatisfiable core [2023-11-26 10:47:38,560 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 10:47:38,574 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 5 [2023-11-26 10:47:38,579 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-26 10:47:38,580 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2023-11-26 10:47:38,585 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-26 10:47:38,586 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-26 10:47:38,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-26 10:47:38,590 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2023-11-26 10:47:38,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-26 10:47:38,597 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-26 10:47:38,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-26 10:47:38,605 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 1 [2023-11-26 10:47:38,779 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-26 10:47:38,779 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 14 [2023-11-26 10:47:39,015 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-26 10:47:39,015 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 10:47:39,533 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-26 10:47:39,533 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [812318962] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-26 10:47:39,534 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-26 10:47:39,534 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [5, 9] total 22 [2023-11-26 10:47:39,534 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743084062] [2023-11-26 10:47:39,534 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-26 10:47:39,534 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-26 10:47:39,534 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:47:39,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-26 10:47:39,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2023-11-26 10:47:40,341 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 75 out of 139 [2023-11-26 10:47:40,342 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 129 places, 115 transitions, 403 flow. Second operand has 10 states, 10 states have (on average 77.3) internal successors, (773), 10 states have internal predecessors, (773), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 10:47:40,344 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:47:40,344 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 75 of 139 [2023-11-26 10:47:40,345 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand