./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/pthread/stack_longer-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability 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_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/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_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/config/AutomizerReach.xml -i ../../sv-benchmarks/c/pthread/stack_longer-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 402cb3c5f3290109e83e598d96446a87fac59fa4aaa0b6234366e7da005f5688 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-26 10:46:21,849 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-26 10:46:21,919 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/config/svcomp-Reach-32bit-Automizer_Default.epf [2023-11-26 10:46:21,925 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-26 10:46:21,926 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-26 10:46:21,953 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-26 10:46:21,954 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-26 10:46:21,954 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-26 10:46:21,955 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2023-11-26 10:46:21,956 INFO L153 SettingsManager]: * Use memory slicer=true [2023-11-26 10:46:21,957 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-26 10:46:21,957 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-26 10:46:21,958 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-26 10:46:21,959 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-26 10:46:21,960 INFO L153 SettingsManager]: * Use SBE=true [2023-11-26 10:46:21,960 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-26 10:46:21,961 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-26 10:46:21,962 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-26 10:46:21,962 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-26 10:46:21,963 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-26 10:46:21,964 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-26 10:46:21,969 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-26 10:46:21,969 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-26 10:46:21,970 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-26 10:46:21,970 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-26 10:46:21,971 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-26 10:46:21,971 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-26 10:46:21,973 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-26 10:46:21,974 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-26 10:46:21,975 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-26 10:46:21,975 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-26 10:46:21,977 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2023-11-26 10:46:21,977 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-26 10:46:21,978 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-26 10:46:21,979 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-26 10:46:21,979 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-26 10:46:21,979 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-26 10:46:21,979 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-26 10:46:21,980 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-26 10:46:21,980 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-26 10:46:21,980 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-26 10:46:21,981 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-26 10:46:21,981 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_4413c5a6-e458-49eb-ad64-06401a96b655/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 402cb3c5f3290109e83e598d96446a87fac59fa4aaa0b6234366e7da005f5688 [2023-11-26 10:46:22,262 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-26 10:46:22,285 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-26 10:46:22,289 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-26 10:46:22,290 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-26 10:46:22,291 INFO L274 PluginConnector]: CDTParser initialized [2023-11-26 10:46:22,292 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/../../sv-benchmarks/c/pthread/stack_longer-2.i [2023-11-26 10:46:25,541 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-26 10:46:25,859 INFO L384 CDTParser]: Found 1 translation units. [2023-11-26 10:46:25,863 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/sv-benchmarks/c/pthread/stack_longer-2.i [2023-11-26 10:46:25,885 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/data/783ba0561/bece41677a7a488385b8127ac5a90937/FLAG83ea396b3 [2023-11-26 10:46:25,904 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/data/783ba0561/bece41677a7a488385b8127ac5a90937 [2023-11-26 10:46:25,913 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-26 10:46:25,915 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-26 10:46:25,920 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-26 10:46:25,920 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-26 10:46:25,926 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-26 10:46:25,930 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 10:46:25" (1/1) ... [2023-11-26 10:46:25,931 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2e476434 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:25, skipping insertion in model container [2023-11-26 10:46:25,931 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 10:46:25" (1/1) ... [2023-11-26 10:46:26,010 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-26 10:46:26,728 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/sv-benchmarks/c/pthread/stack_longer-2.i[41529,41542] [2023-11-26 10:46:26,775 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-26 10:46:26,788 INFO L202 MainTranslator]: Completed pre-run [2023-11-26 10:46:26,850 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/sv-benchmarks/c/pthread/stack_longer-2.i[41529,41542] [2023-11-26 10:46:26,876 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-26 10:46:27,005 INFO L206 MainTranslator]: Completed translation [2023-11-26 10:46:27,006 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:27 WrapperNode [2023-11-26 10:46:27,006 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-26 10:46:27,007 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-26 10:46:27,008 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-26 10:46:27,008 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-26 10:46:27,016 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:27" (1/1) ... [2023-11-26 10:46:27,051 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:27" (1/1) ... [2023-11-26 10:46:27,103 INFO L138 Inliner]: procedures = 278, calls = 40, calls flagged for inlining = 11, calls inlined = 11, statements flattened = 154 [2023-11-26 10:46:27,103 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-26 10:46:27,104 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-26 10:46:27,104 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-26 10:46:27,104 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-26 10:46:27,116 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:27" (1/1) ... [2023-11-26 10:46:27,116 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:27" (1/1) ... [2023-11-26 10:46:27,130 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:27" (1/1) ... [2023-11-26 10:46:27,160 INFO L175 MemorySlicer]: Split 14 memory accesses to 5 slices as follows [2, 5, 3, 2, 2]. 36 percent of accesses are in the largest equivalence class. The 7 initializations are split as follows [2, 5, 0, 0, 0]. The 4 writes are split as follows [0, 0, 2, 1, 1]. [2023-11-26 10:46:27,162 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:27" (1/1) ... [2023-11-26 10:46:27,162 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:27" (1/1) ... [2023-11-26 10:46:27,175 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:27" (1/1) ... [2023-11-26 10:46:27,193 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:27" (1/1) ... [2023-11-26 10:46:27,195 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:27" (1/1) ... [2023-11-26 10:46:27,197 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:27" (1/1) ... [2023-11-26 10:46:27,206 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-26 10:46:27,213 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-26 10:46:27,213 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-26 10:46:27,213 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-26 10:46:27,214 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:27" (1/1) ... [2023-11-26 10:46:27,220 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2023-11-26 10:46:27,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 10:46:27,249 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2023-11-26 10:46:27,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2023-11-26 10:46:27,298 INFO L130 BoogieDeclarations]: Found specification of procedure t1 [2023-11-26 10:46:27,298 INFO L138 BoogieDeclarations]: Found implementation of procedure t1 [2023-11-26 10:46:27,299 INFO L130 BoogieDeclarations]: Found specification of procedure t2 [2023-11-26 10:46:27,300 INFO L138 BoogieDeclarations]: Found implementation of procedure t2 [2023-11-26 10:46:27,300 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-26 10:46:27,300 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-26 10:46:27,300 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexUnlock [2023-11-26 10:46:27,301 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#0 [2023-11-26 10:46:27,303 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#1 [2023-11-26 10:46:27,303 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#2 [2023-11-26 10:46:27,303 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#3 [2023-11-26 10:46:27,303 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#4 [2023-11-26 10:46:27,303 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#0 [2023-11-26 10:46:27,304 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#1 [2023-11-26 10:46:27,304 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#2 [2023-11-26 10:46:27,304 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#3 [2023-11-26 10:46:27,304 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#4 [2023-11-26 10:46:27,305 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-11-26 10:46:27,306 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-26 10:46:27,306 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2023-11-26 10:46:27,307 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2023-11-26 10:46:27,307 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#2 [2023-11-26 10:46:27,307 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#3 [2023-11-26 10:46:27,307 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#4 [2023-11-26 10:46:27,307 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-26 10:46:27,308 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-26 10:46:27,312 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 10:46:27,476 INFO L241 CfgBuilder]: Building ICFG [2023-11-26 10:46:27,478 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-26 10:46:27,760 INFO L282 CfgBuilder]: Performing block encoding [2023-11-26 10:46:28,151 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-26 10:46:28,151 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-26 10:46:28,152 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 10:46:28 BoogieIcfgContainer [2023-11-26 10:46:28,152 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-26 10:46:28,155 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-26 10:46:28,155 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-26 10:46:28,159 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-26 10:46:28,159 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.11 10:46:25" (1/3) ... [2023-11-26 10:46:28,160 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@468e468e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 10:46:28, skipping insertion in model container [2023-11-26 10:46:28,160 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 10:46:27" (2/3) ... [2023-11-26 10:46:28,161 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@468e468e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 10:46:28, skipping insertion in model container [2023-11-26 10:46:28,161 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 10:46:28" (3/3) ... [2023-11-26 10:46:28,162 INFO L112 eAbstractionObserver]: Analyzing ICFG stack_longer-2.i [2023-11-26 10:46:28,172 WARN L145 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2023-11-26 10:46:28,184 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-26 10:46:28,185 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-11-26 10:46:28,185 INFO L514 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-11-26 10:46:28,269 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-11-26 10:46:28,312 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 37 places, 35 transitions, 84 flow [2023-11-26 10:46:28,343 INFO L124 PetriNetUnfolderBase]: 5/33 cut-off events. [2023-11-26 10:46:28,343 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-11-26 10:46:28,347 INFO L83 FinitePrefix]: Finished finitePrefix Result has 42 conditions, 33 events. 5/33 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 61 event pairs, 0 based on Foata normal form. 0/26 useless extension candidates. Maximal degree in co-relation 29. Up to 3 conditions per place. [2023-11-26 10:46:28,347 INFO L82 GeneralOperation]: Start removeDead. Operand has 37 places, 35 transitions, 84 flow [2023-11-26 10:46:28,351 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 33 places, 31 transitions, 71 flow [2023-11-26 10:46:28,362 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-26 10:46:28,369 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@2df5b55d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-26 10:46:28,370 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2023-11-26 10:46:28,380 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-11-26 10:46:28,380 INFO L124 PetriNetUnfolderBase]: 1/18 cut-off events. [2023-11-26 10:46:28,381 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-11-26 10:46:28,381 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:46:28,382 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 10:46:28,382 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting t1Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 4 more)] === [2023-11-26 10:46:28,388 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:46:28,388 INFO L85 PathProgramCache]: Analyzing trace with hash -28897917, now seen corresponding path program 1 times [2023-11-26 10:46:28,398 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:46:28,399 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [503678764] [2023-11-26 10:46:28,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:46:28,400 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:46:28,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:46:28,889 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 10:46:28,889 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:46:28,890 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [503678764] [2023-11-26 10:46:28,891 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [503678764] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-26 10:46:28,891 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-26 10:46:28,892 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-26 10:46:28,895 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567714102] [2023-11-26 10:46:28,896 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-26 10:46:28,903 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-26 10:46:28,908 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:46:28,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-26 10:46:28,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-26 10:46:28,955 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 8 out of 35 [2023-11-26 10:46:28,959 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 33 places, 31 transitions, 71 flow. Second operand has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 0 states have call successors, (0), 0 states 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 10:46:28,959 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:46:28,960 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 8 of 35 [2023-11-26 10:46:28,962 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 10:46:29,275 INFO L124 PetriNetUnfolderBase]: 321/604 cut-off events. [2023-11-26 10:46:29,275 INFO L125 PetriNetUnfolderBase]: For 32/32 co-relation queries the response was YES. [2023-11-26 10:46:29,279 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1187 conditions, 604 events. 321/604 cut-off events. For 32/32 co-relation queries the response was YES. Maximal size of possible extension queue 36. Compared 2742 event pairs, 57 based on Foata normal form. 45/610 useless extension candidates. Maximal degree in co-relation 1056. Up to 375 conditions per place. [2023-11-26 10:46:29,285 INFO L140 encePairwiseOnDemand]: 28/35 looper letters, 42 selfloop transitions, 3 changer transitions 3/54 dead transitions. [2023-11-26 10:46:29,285 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 36 places, 54 transitions, 222 flow [2023-11-26 10:46:29,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-26 10:46:29,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-11-26 10:46:29,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 85 transitions. [2023-11-26 10:46:29,300 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6071428571428571 [2023-11-26 10:46:29,301 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 85 transitions. [2023-11-26 10:46:29,301 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 85 transitions. [2023-11-26 10:46:29,303 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 10:46:29,305 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 85 transitions. [2023-11-26 10:46:29,308 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 21.25) internal successors, (85), 4 states have internal predecessors, (85), 0 states have call successors, (0), 0 states 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 10:46:29,316 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 35.0) internal successors, (175), 5 states have internal predecessors, (175), 0 states have call successors, (0), 0 states 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 10:46:29,316 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 35.0) internal successors, (175), 5 states have internal predecessors, (175), 0 states have call successors, (0), 0 states 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 10:46:29,319 INFO L175 Difference]: Start difference. First operand has 33 places, 31 transitions, 71 flow. Second operand 4 states and 85 transitions. [2023-11-26 10:46:29,320 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 36 places, 54 transitions, 222 flow [2023-11-26 10:46:29,324 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 33 places, 54 transitions, 213 flow, removed 0 selfloop flow, removed 3 redundant places. [2023-11-26 10:46:29,330 INFO L231 Difference]: Finished difference. Result has 35 places, 31 transitions, 84 flow [2023-11-26 10:46:29,332 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=35, PETRI_DIFFERENCE_MINUEND_FLOW=62, PETRI_DIFFERENCE_MINUEND_PLACES=30, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=29, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=26, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=84, PETRI_PLACES=35, PETRI_TRANSITIONS=31} [2023-11-26 10:46:29,339 INFO L281 CegarLoopForPetriNet]: 33 programPoint places, 2 predicate places. [2023-11-26 10:46:29,339 INFO L495 AbstractCegarLoop]: Abstraction has has 35 places, 31 transitions, 84 flow [2023-11-26 10:46:29,339 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 0 states have call successors, (0), 0 states 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 10:46:29,340 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:46:29,340 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 10:46:29,340 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-26 10:46:29,340 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting t1Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 4 more)] === [2023-11-26 10:46:29,341 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:46:29,341 INFO L85 PathProgramCache]: Analyzing trace with hash 994745822, now seen corresponding path program 1 times [2023-11-26 10:46:29,341 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:46:29,342 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [802237450] [2023-11-26 10:46:29,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:46:29,342 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:46:29,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:46:29,719 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 10:46:29,719 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:46:29,720 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [802237450] [2023-11-26 10:46:29,720 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [802237450] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 10:46:29,720 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [57536436] [2023-11-26 10:46:29,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:46:29,721 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 10:46:29,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 10:46:29,725 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 10:46:29,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-26 10:46:29,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:46:29,918 INFO L262 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-26 10:46:29,926 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 10:46:30,020 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 8 treesize of output 1 [2023-11-26 10:46:30,164 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 10:46:30,166 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 10:46:30,305 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 10:46:30,305 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [57536436] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-26 10:46:30,305 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-26 10:46:30,306 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2023-11-26 10:46:30,307 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1572201148] [2023-11-26 10:46:30,307 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-26 10:46:30,309 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-26 10:46:30,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:46:30,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-26 10:46:30,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2023-11-26 10:46:30,314 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 7 out of 35 [2023-11-26 10:46:30,315 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 35 places, 31 transitions, 84 flow. Second operand has 9 states, 9 states have (on average 10.444444444444445) internal successors, (94), 9 states have internal predecessors, (94), 0 states have call successors, (0), 0 states 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 10:46:30,316 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:46:30,316 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 7 of 35 [2023-11-26 10:46:30,317 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 10:46:31,229 INFO L124 PetriNetUnfolderBase]: 1316/2465 cut-off events. [2023-11-26 10:46:31,229 INFO L125 PetriNetUnfolderBase]: For 306/308 co-relation queries the response was YES. [2023-11-26 10:46:31,237 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5171 conditions, 2465 events. 1316/2465 cut-off events. For 306/308 co-relation queries the response was YES. Maximal size of possible extension queue 81. Compared 13438 event pairs, 164 based on Foata normal form. 52/2411 useless extension candidates. Maximal degree in co-relation 4582. Up to 383 conditions per place. [2023-11-26 10:46:31,253 INFO L140 encePairwiseOnDemand]: 29/35 looper letters, 168 selfloop transitions, 32 changer transitions 6/211 dead transitions. [2023-11-26 10:46:31,253 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 49 places, 211 transitions, 928 flow [2023-11-26 10:46:31,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-26 10:46:31,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2023-11-26 10:46:31,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 320 transitions. [2023-11-26 10:46:31,258 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6095238095238096 [2023-11-26 10:46:31,259 INFO L72 ComplementDD]: Start complementDD. Operand 15 states and 320 transitions. [2023-11-26 10:46:31,259 INFO L73 IsDeterministic]: Start isDeterministic. Operand 15 states and 320 transitions. [2023-11-26 10:46:31,260 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 10:46:31,261 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 15 states and 320 transitions. [2023-11-26 10:46:31,263 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 16 states, 15 states have (on average 21.333333333333332) internal successors, (320), 15 states have internal predecessors, (320), 0 states have call successors, (0), 0 states 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 10:46:31,266 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 16 states, 16 states have (on average 35.0) internal successors, (560), 16 states have internal predecessors, (560), 0 states have call successors, (0), 0 states 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 10:46:31,267 INFO L81 ComplementDD]: Finished complementDD. Result has 16 states, 16 states have (on average 35.0) internal successors, (560), 16 states have internal predecessors, (560), 0 states have call successors, (0), 0 states 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 10:46:31,267 INFO L175 Difference]: Start difference. First operand has 35 places, 31 transitions, 84 flow. Second operand 15 states and 320 transitions. [2023-11-26 10:46:31,267 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 49 places, 211 transitions, 928 flow [2023-11-26 10:46:31,271 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 48 places, 211 transitions, 924 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-11-26 10:46:31,274 INFO L231 Difference]: Finished difference. Result has 55 places, 67 transitions, 331 flow [2023-11-26 10:46:31,275 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=35, PETRI_DIFFERENCE_MINUEND_FLOW=82, PETRI_DIFFERENCE_MINUEND_PLACES=34, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=31, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=7, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=24, PETRI_DIFFERENCE_SUBTRAHEND_STATES=15, PETRI_FLOW=331, PETRI_PLACES=55, PETRI_TRANSITIONS=67} [2023-11-26 10:46:31,276 INFO L281 CegarLoopForPetriNet]: 33 programPoint places, 22 predicate places. [2023-11-26 10:46:31,276 INFO L495 AbstractCegarLoop]: Abstraction has has 55 places, 67 transitions, 331 flow [2023-11-26 10:46:31,276 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 10.444444444444445) internal successors, (94), 9 states have internal predecessors, (94), 0 states have call successors, (0), 0 states 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 10:46:31,277 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:46:31,277 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 10:46:31,294 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-26 10:46:31,494 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 10:46:31,495 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting t2Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 4 more)] === [2023-11-26 10:46:31,495 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:46:31,495 INFO L85 PathProgramCache]: Analyzing trace with hash 134985196, now seen corresponding path program 1 times [2023-11-26 10:46:31,495 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:46:31,496 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1446222573] [2023-11-26 10:46:31,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:46:31,496 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:46:31,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:46:31,658 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 10:46:31,659 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:46:31,659 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1446222573] [2023-11-26 10:46:31,659 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1446222573] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-26 10:46:31,660 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-26 10:46:31,660 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-26 10:46:31,660 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320991910] [2023-11-26 10:46:31,660 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-26 10:46:31,661 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-26 10:46:31,661 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:46:31,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-26 10:46:31,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-26 10:46:31,662 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 8 out of 35 [2023-11-26 10:46:31,662 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 55 places, 67 transitions, 331 flow. Second operand has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 0 states have call successors, (0), 0 states 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 10:46:31,663 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:46:31,663 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 8 of 35 [2023-11-26 10:46:31,663 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 10:46:31,976 INFO L124 PetriNetUnfolderBase]: 716/1463 cut-off events. [2023-11-26 10:46:31,976 INFO L125 PetriNetUnfolderBase]: For 615/615 co-relation queries the response was YES. [2023-11-26 10:46:31,982 INFO L83 FinitePrefix]: Finished finitePrefix Result has 3275 conditions, 1463 events. 716/1463 cut-off events. For 615/615 co-relation queries the response was YES. Maximal size of possible extension queue 51. Compared 7625 event pairs, 252 based on Foata normal form. 66/1512 useless extension candidates. Maximal degree in co-relation 3127. Up to 664 conditions per place. [2023-11-26 10:46:31,991 INFO L140 encePairwiseOnDemand]: 31/35 looper letters, 45 selfloop transitions, 4 changer transitions 0/61 dead transitions. [2023-11-26 10:46:31,991 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 54 places, 61 transitions, 347 flow [2023-11-26 10:46:31,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-26 10:46:31,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-26 10:46:31,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 60 transitions. [2023-11-26 10:46:31,993 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5714285714285714 [2023-11-26 10:46:31,993 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 60 transitions. [2023-11-26 10:46:31,993 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 60 transitions. [2023-11-26 10:46:31,993 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 10:46:31,993 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 60 transitions. [2023-11-26 10:46:31,994 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 0 states have call successors, (0), 0 states 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 10:46:31,996 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 35.0) internal successors, (140), 4 states have internal predecessors, (140), 0 states have call successors, (0), 0 states 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 10:46:31,996 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 35.0) internal successors, (140), 4 states have internal predecessors, (140), 0 states have call successors, (0), 0 states 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 10:46:31,997 INFO L175 Difference]: Start difference. First operand has 55 places, 67 transitions, 331 flow. Second operand 3 states and 60 transitions. [2023-11-26 10:46:31,997 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 54 places, 61 transitions, 347 flow [2023-11-26 10:46:32,012 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 51 places, 61 transitions, 315 flow, removed 16 selfloop flow, removed 3 redundant places. [2023-11-26 10:46:32,015 INFO L231 Difference]: Finished difference. Result has 51 places, 50 transitions, 200 flow [2023-11-26 10:46:32,016 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=35, PETRI_DIFFERENCE_MINUEND_FLOW=192, PETRI_DIFFERENCE_MINUEND_PLACES=49, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=50, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=46, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=200, PETRI_PLACES=51, PETRI_TRANSITIONS=50} [2023-11-26 10:46:32,017 INFO L281 CegarLoopForPetriNet]: 33 programPoint places, 18 predicate places. [2023-11-26 10:46:32,018 INFO L495 AbstractCegarLoop]: Abstraction has has 51 places, 50 transitions, 200 flow [2023-11-26 10:46:32,018 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 0 states have call successors, (0), 0 states 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 10:46:32,018 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:46:32,019 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 10:46:32,019 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-26 10:46:32,020 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting t2Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 4 more)] === [2023-11-26 10:46:32,021 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:46:32,021 INFO L85 PathProgramCache]: Analyzing trace with hash 1587857623, now seen corresponding path program 1 times [2023-11-26 10:46:32,021 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:46:32,022 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2013119050] [2023-11-26 10:46:32,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:46:32,022 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:46:32,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:46:32,673 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 10:46:32,673 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:46:32,674 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2013119050] [2023-11-26 10:46:32,674 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2013119050] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-26 10:46:32,674 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-26 10:46:32,674 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-26 10:46:32,675 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503211536] [2023-11-26 10:46:32,675 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-26 10:46:32,676 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-26 10:46:32,676 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:46:32,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-26 10:46:32,679 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-26 10:46:32,689 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 8 out of 35 [2023-11-26 10:46:32,689 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 51 places, 50 transitions, 200 flow. Second operand has 5 states, 5 states have (on average 10.6) internal successors, (53), 5 states have internal predecessors, (53), 0 states have call successors, (0), 0 states 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 10:46:32,690 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:46:32,690 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 8 of 35 [2023-11-26 10:46:32,690 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 10:46:33,126 INFO L124 PetriNetUnfolderBase]: 832/1687 cut-off events. [2023-11-26 10:46:33,126 INFO L125 PetriNetUnfolderBase]: For 547/547 co-relation queries the response was YES. [2023-11-26 10:46:33,130 INFO L83 FinitePrefix]: Finished finitePrefix Result has 3841 conditions, 1687 events. 832/1687 cut-off events. For 547/547 co-relation queries the response was YES. Maximal size of possible extension queue 66. Compared 8986 event pairs, 230 based on Foata normal form. 0/1665 useless extension candidates. Maximal degree in co-relation 3457. Up to 1052 conditions per place. [2023-11-26 10:46:33,139 INFO L140 encePairwiseOnDemand]: 30/35 looper letters, 59 selfloop transitions, 6 changer transitions 8/85 dead transitions. [2023-11-26 10:46:33,139 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 55 places, 85 transitions, 445 flow [2023-11-26 10:46:33,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-26 10:46:33,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-11-26 10:46:33,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 100 transitions. [2023-11-26 10:46:33,141 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5714285714285714 [2023-11-26 10:46:33,141 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 100 transitions. [2023-11-26 10:46:33,142 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 100 transitions. [2023-11-26 10:46:33,142 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 10:46:33,142 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 100 transitions. [2023-11-26 10:46:33,143 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 20.0) internal successors, (100), 5 states have internal predecessors, (100), 0 states have call successors, (0), 0 states 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 10:46:33,144 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 35.0) internal successors, (210), 6 states have internal predecessors, (210), 0 states have call successors, (0), 0 states 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 10:46:33,144 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 35.0) internal successors, (210), 6 states have internal predecessors, (210), 0 states have call successors, (0), 0 states 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 10:46:33,144 INFO L175 Difference]: Start difference. First operand has 51 places, 50 transitions, 200 flow. Second operand 5 states and 100 transitions. [2023-11-26 10:46:33,145 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 55 places, 85 transitions, 445 flow [2023-11-26 10:46:33,149 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 54 places, 85 transitions, 434 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-11-26 10:46:33,151 INFO L231 Difference]: Finished difference. Result has 56 places, 54 transitions, 240 flow [2023-11-26 10:46:33,151 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=35, PETRI_DIFFERENCE_MINUEND_FLOW=196, PETRI_DIFFERENCE_MINUEND_PLACES=50, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=50, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=44, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=240, PETRI_PLACES=56, PETRI_TRANSITIONS=54} [2023-11-26 10:46:33,152 INFO L281 CegarLoopForPetriNet]: 33 programPoint places, 23 predicate places. [2023-11-26 10:46:33,153 INFO L495 AbstractCegarLoop]: Abstraction has has 56 places, 54 transitions, 240 flow [2023-11-26 10:46:33,153 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.6) internal successors, (53), 5 states have internal predecessors, (53), 0 states have call successors, (0), 0 states 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 10:46:33,153 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:46:33,153 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 10:46:33,154 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-26 10:46:33,154 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting t2Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 4 more)] === [2023-11-26 10:46:33,155 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:46:33,155 INFO L85 PathProgramCache]: Analyzing trace with hash 1957737570, now seen corresponding path program 1 times [2023-11-26 10:46:33,155 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:46:33,155 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1907019097] [2023-11-26 10:46:33,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:46:33,156 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:46:33,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:46:33,785 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 10:46:33,786 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:46:33,786 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1907019097] [2023-11-26 10:46:33,786 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1907019097] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 10:46:33,787 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [103607661] [2023-11-26 10:46:33,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:46:33,787 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 10:46:33,787 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 10:46:33,789 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 10:46:33,812 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-26 10:46:33,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:46:33,951 INFO L262 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-26 10:46:33,956 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 10:46:34,033 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 12 [2023-11-26 10:46:34,243 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 80 treesize of output 32 [2023-11-26 10:46:34,300 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-26 10:46:34,300 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-26 10:46:34,301 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [103607661] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-26 10:46:34,301 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-26 10:46:34,301 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 9 [2023-11-26 10:46:34,301 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219318722] [2023-11-26 10:46:34,302 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-26 10:46:34,302 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-26 10:46:34,302 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:46:34,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-26 10:46:34,303 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2023-11-26 10:46:34,313 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 7 out of 35 [2023-11-26 10:46:34,313 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 56 places, 54 transitions, 240 flow. Second operand has 5 states, 5 states have (on average 10.4) internal successors, (52), 5 states have internal predecessors, (52), 0 states have call successors, (0), 0 states 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 10:46:34,313 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:46:34,314 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 7 of 35 [2023-11-26 10:46:34,314 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 10:46:34,790 INFO L124 PetriNetUnfolderBase]: 1010/1997 cut-off events. [2023-11-26 10:46:34,790 INFO L125 PetriNetUnfolderBase]: For 893/893 co-relation queries the response was YES. [2023-11-26 10:46:34,796 INFO L83 FinitePrefix]: Finished finitePrefix Result has 4585 conditions, 1997 events. 1010/1997 cut-off events. For 893/893 co-relation queries the response was YES. Maximal size of possible extension queue 63. Compared 10840 event pairs, 543 based on Foata normal form. 0/1955 useless extension candidates. Maximal degree in co-relation 3946. Up to 1170 conditions per place. [2023-11-26 10:46:34,806 INFO L140 encePairwiseOnDemand]: 28/35 looper letters, 53 selfloop transitions, 30 changer transitions 0/88 dead transitions. [2023-11-26 10:46:34,807 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 61 places, 88 transitions, 515 flow [2023-11-26 10:46:34,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-26 10:46:34,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-11-26 10:46:34,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 97 transitions. [2023-11-26 10:46:34,808 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.46190476190476193 [2023-11-26 10:46:34,808 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 97 transitions. [2023-11-26 10:46:34,809 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 97 transitions. [2023-11-26 10:46:34,809 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 10:46:34,809 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 97 transitions. [2023-11-26 10:46:34,810 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 16.166666666666668) internal successors, (97), 6 states have internal predecessors, (97), 0 states have call successors, (0), 0 states 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 10:46:34,810 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 35.0) internal successors, (245), 7 states have internal predecessors, (245), 0 states have call successors, (0), 0 states 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 10:46:34,811 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 35.0) internal successors, (245), 7 states have internal predecessors, (245), 0 states have call successors, (0), 0 states 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 10:46:34,811 INFO L175 Difference]: Start difference. First operand has 56 places, 54 transitions, 240 flow. Second operand 6 states and 97 transitions. [2023-11-26 10:46:34,811 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 61 places, 88 transitions, 515 flow [2023-11-26 10:46:34,815 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 59 places, 88 transitions, 509 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-11-26 10:46:34,817 INFO L231 Difference]: Finished difference. Result has 61 places, 61 transitions, 373 flow [2023-11-26 10:46:34,817 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=35, PETRI_DIFFERENCE_MINUEND_FLOW=234, PETRI_DIFFERENCE_MINUEND_PLACES=54, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=54, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=23, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=29, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=373, PETRI_PLACES=61, PETRI_TRANSITIONS=61} [2023-11-26 10:46:34,818 INFO L281 CegarLoopForPetriNet]: 33 programPoint places, 28 predicate places. [2023-11-26 10:46:34,818 INFO L495 AbstractCegarLoop]: Abstraction has has 61 places, 61 transitions, 373 flow [2023-11-26 10:46:34,818 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.4) internal successors, (52), 5 states have internal predecessors, (52), 0 states have call successors, (0), 0 states 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 10:46:34,819 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:46:34,819 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 10:46:34,833 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-26 10:46:35,026 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 10:46:35,026 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting t1Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 4 more)] === [2023-11-26 10:46:35,027 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:46:35,027 INFO L85 PathProgramCache]: Analyzing trace with hash 742439305, now seen corresponding path program 1 times [2023-11-26 10:46:35,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:46:35,027 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1908551311] [2023-11-26 10:46:35,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:46:35,028 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:46:35,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:46:35,424 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-26 10:46:35,425 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:46:35,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1908551311] [2023-11-26 10:46:35,425 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1908551311] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 10:46:35,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2004033001] [2023-11-26 10:46:35,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:46:35,426 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 10:46:35,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 10:46:35,429 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 10:46:35,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-26 10:46:35,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:46:35,601 INFO L262 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-26 10:46:35,608 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 10:46:35,649 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 8 treesize of output 1 [2023-11-26 10:46:35,741 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 8 treesize of output 1 [2023-11-26 10:46:36,059 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 10:46:36,059 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 10:46:36,170 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-26 10:46:36,171 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2004033001] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-26 10:46:36,171 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-26 10:46:36,171 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 8, 6] total 17 [2023-11-26 10:46:36,171 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583703722] [2023-11-26 10:46:36,171 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-26 10:46:36,172 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-26 10:46:36,173 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:46:36,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-26 10:46:36,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=188, Unknown=0, NotChecked=0, Total=272 [2023-11-26 10:46:36,177 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 7 out of 35 [2023-11-26 10:46:36,177 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 61 places, 61 transitions, 373 flow. Second operand has 17 states, 17 states have (on average 10.941176470588236) internal successors, (186), 17 states have internal predecessors, (186), 0 states have call successors, (0), 0 states 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 10:46:36,177 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:46:36,177 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 7 of 35 [2023-11-26 10:46:36,178 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 10:46:37,491 INFO L124 PetriNetUnfolderBase]: 1838/3633 cut-off events. [2023-11-26 10:46:37,491 INFO L125 PetriNetUnfolderBase]: For 2897/2897 co-relation queries the response was YES. [2023-11-26 10:46:37,503 INFO L83 FinitePrefix]: Finished finitePrefix Result has 8801 conditions, 3633 events. 1838/3633 cut-off events. For 2897/2897 co-relation queries the response was YES. Maximal size of possible extension queue 104. Compared 21014 event pairs, 277 based on Foata normal form. 52/3667 useless extension candidates. Maximal degree in co-relation 7988. Up to 543 conditions per place. [2023-11-26 10:46:37,523 INFO L140 encePairwiseOnDemand]: 29/35 looper letters, 180 selfloop transitions, 60 changer transitions 18/263 dead transitions. [2023-11-26 10:46:37,523 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 79 places, 263 transitions, 1557 flow [2023-11-26 10:46:37,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-11-26 10:46:37,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2023-11-26 10:46:37,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 362 transitions. [2023-11-26 10:46:37,526 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.544360902255639 [2023-11-26 10:46:37,526 INFO L72 ComplementDD]: Start complementDD. Operand 19 states and 362 transitions. [2023-11-26 10:46:37,526 INFO L73 IsDeterministic]: Start isDeterministic. Operand 19 states and 362 transitions. [2023-11-26 10:46:37,527 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 10:46:37,527 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 19 states and 362 transitions. [2023-11-26 10:46:37,528 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 20 states, 19 states have (on average 19.05263157894737) internal successors, (362), 19 states have internal predecessors, (362), 0 states have call successors, (0), 0 states 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 10:46:37,530 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 20 states, 20 states have (on average 35.0) internal successors, (700), 20 states have internal predecessors, (700), 0 states have call successors, (0), 0 states 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 10:46:37,531 INFO L81 ComplementDD]: Finished complementDD. Result has 20 states, 20 states have (on average 35.0) internal successors, (700), 20 states have internal predecessors, (700), 0 states have call successors, (0), 0 states 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 10:46:37,531 INFO L175 Difference]: Start difference. First operand has 61 places, 61 transitions, 373 flow. Second operand 19 states and 362 transitions. [2023-11-26 10:46:37,531 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 79 places, 263 transitions, 1557 flow [2023-11-26 10:46:37,545 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 77 places, 263 transitions, 1483 flow, removed 15 selfloop flow, removed 2 redundant places. [2023-11-26 10:46:37,550 INFO L231 Difference]: Finished difference. Result has 81 places, 96 transitions, 722 flow [2023-11-26 10:46:37,550 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=35, PETRI_DIFFERENCE_MINUEND_FLOW=331, PETRI_DIFFERENCE_MINUEND_PLACES=59, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=61, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=31, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=30, PETRI_DIFFERENCE_SUBTRAHEND_STATES=19, PETRI_FLOW=722, PETRI_PLACES=81, PETRI_TRANSITIONS=96} [2023-11-26 10:46:37,551 INFO L281 CegarLoopForPetriNet]: 33 programPoint places, 48 predicate places. [2023-11-26 10:46:37,551 INFO L495 AbstractCegarLoop]: Abstraction has has 81 places, 96 transitions, 722 flow [2023-11-26 10:46:37,552 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 10.941176470588236) internal successors, (186), 17 states have internal predecessors, (186), 0 states have call successors, (0), 0 states 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 10:46:37,552 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:46:37,552 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 10:46:37,563 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-26 10:46:37,758 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-26 10:46:37,758 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting t2Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 4 more)] === [2023-11-26 10:46:37,759 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:46:37,759 INFO L85 PathProgramCache]: Analyzing trace with hash -872153553, now seen corresponding path program 1 times [2023-11-26 10:46:37,759 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:46:37,759 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1089069217] [2023-11-26 10:46:37,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:46:37,760 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:46:37,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:46:38,759 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 10:46:38,760 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:46:38,760 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1089069217] [2023-11-26 10:46:38,761 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1089069217] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 10:46:38,761 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1358215711] [2023-11-26 10:46:38,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:46:38,761 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 10:46:38,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 10:46:38,765 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 10:46:38,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-26 10:46:38,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:46:38,934 INFO L262 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-26 10:46:38,943 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 10:46:39,013 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 1 [2023-11-26 10:46:39,140 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 62 treesize of output 46 [2023-11-26 10:46:39,148 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 64 [2023-11-26 10:46:39,245 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 0 case distinctions, treesize of input 34 treesize of output 16 [2023-11-26 10:46:39,977 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-26 10:46:39,978 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 105 treesize of output 57 [2023-11-26 10:46:40,034 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 10:46:40,035 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 10:46:40,549 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 10:46:40,549 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1358215711] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-26 10:46:40,549 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-26 10:46:40,549 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 18 [2023-11-26 10:46:40,550 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509432395] [2023-11-26 10:46:40,550 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-26 10:46:40,551 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-26 10:46:40,553 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:46:40,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-26 10:46:40,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=222, Unknown=0, NotChecked=0, Total=306 [2023-11-26 10:46:40,556 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 7 out of 35 [2023-11-26 10:46:40,557 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 81 places, 96 transitions, 722 flow. Second operand has 18 states, 18 states have (on average 10.833333333333334) internal successors, (195), 18 states have internal predecessors, (195), 0 states have call successors, (0), 0 states 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 10:46:40,557 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:46:40,557 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 7 of 35 [2023-11-26 10:46:40,557 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 10:46:42,651 INFO L124 PetriNetUnfolderBase]: 2813/5570 cut-off events. [2023-11-26 10:46:42,652 INFO L125 PetriNetUnfolderBase]: For 6446/6446 co-relation queries the response was YES. [2023-11-26 10:46:42,673 INFO L83 FinitePrefix]: Finished finitePrefix Result has 14086 conditions, 5570 events. 2813/5570 cut-off events. For 6446/6446 co-relation queries the response was YES. Maximal size of possible extension queue 92. Compared 31841 event pairs, 597 based on Foata normal form. 48/5608 useless extension candidates. Maximal degree in co-relation 13089. Up to 936 conditions per place. [2023-11-26 10:46:42,703 INFO L140 encePairwiseOnDemand]: 27/35 looper letters, 177 selfloop transitions, 84 changer transitions 27/293 dead transitions. [2023-11-26 10:46:42,703 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 100 places, 293 transitions, 2092 flow [2023-11-26 10:46:42,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-11-26 10:46:42,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2023-11-26 10:46:42,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 355 transitions. [2023-11-26 10:46:42,707 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5071428571428571 [2023-11-26 10:46:42,708 INFO L72 ComplementDD]: Start complementDD. Operand 20 states and 355 transitions. [2023-11-26 10:46:42,708 INFO L73 IsDeterministic]: Start isDeterministic. Operand 20 states and 355 transitions. [2023-11-26 10:46:42,708 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 10:46:42,709 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 20 states and 355 transitions. [2023-11-26 10:46:42,711 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 21 states, 20 states have (on average 17.75) internal successors, (355), 20 states have internal predecessors, (355), 0 states have call successors, (0), 0 states 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 10:46:42,714 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 21 states, 21 states have (on average 35.0) internal successors, (735), 21 states have internal predecessors, (735), 0 states have call successors, (0), 0 states 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 10:46:42,715 INFO L81 ComplementDD]: Finished complementDD. Result has 21 states, 21 states have (on average 35.0) internal successors, (735), 21 states have internal predecessors, (735), 0 states have call successors, (0), 0 states 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 10:46:42,715 INFO L175 Difference]: Start difference. First operand has 81 places, 96 transitions, 722 flow. Second operand 20 states and 355 transitions. [2023-11-26 10:46:42,715 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 100 places, 293 transitions, 2092 flow [2023-11-26 10:46:42,749 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 96 places, 293 transitions, 1922 flow, removed 45 selfloop flow, removed 4 redundant places. [2023-11-26 10:46:42,754 INFO L231 Difference]: Finished difference. Result has 105 places, 137 transitions, 1186 flow [2023-11-26 10:46:42,754 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=35, PETRI_DIFFERENCE_MINUEND_FLOW=613, PETRI_DIFFERENCE_MINUEND_PLACES=77, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=95, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=45, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=40, PETRI_DIFFERENCE_SUBTRAHEND_STATES=20, PETRI_FLOW=1186, PETRI_PLACES=105, PETRI_TRANSITIONS=137} [2023-11-26 10:46:42,755 INFO L281 CegarLoopForPetriNet]: 33 programPoint places, 72 predicate places. [2023-11-26 10:46:42,755 INFO L495 AbstractCegarLoop]: Abstraction has has 105 places, 137 transitions, 1186 flow [2023-11-26 10:46:42,757 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 10.833333333333334) internal successors, (195), 18 states have internal predecessors, (195), 0 states have call successors, (0), 0 states 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 10:46:42,757 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:46:42,757 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1] [2023-11-26 10:46:42,764 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-26 10:46:42,964 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-26 10:46:42,965 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting t1Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 4 more)] === [2023-11-26 10:46:42,966 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:46:42,966 INFO L85 PathProgramCache]: Analyzing trace with hash 449342831, now seen corresponding path program 2 times [2023-11-26 10:46:42,966 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:46:42,967 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2096288167] [2023-11-26 10:46:42,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:46:42,967 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:46:43,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:46:43,339 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 10:46:43,339 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:46:43,339 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2096288167] [2023-11-26 10:46:43,340 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2096288167] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 10:46:43,340 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1229481733] [2023-11-26 10:46:43,340 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-26 10:46:43,340 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 10:46:43,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 10:46:43,345 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 10:46:43,364 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-26 10:46:43,544 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-26 10:46:43,544 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-26 10:46:43,547 INFO L262 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-26 10:46:43,555 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 10:46:43,591 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 8 treesize of output 1 [2023-11-26 10:46:43,674 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 8 treesize of output 1 [2023-11-26 10:46:43,773 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 8 treesize of output 1 [2023-11-26 10:46:43,866 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 8 treesize of output 1 [2023-11-26 10:46:43,951 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 10:46:43,951 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 10:46:44,162 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 10:46:44,162 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1229481733] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-26 10:46:44,162 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-26 10:46:44,163 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 11, 11] total 25 [2023-11-26 10:46:44,163 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097026323] [2023-11-26 10:46:44,163 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-26 10:46:44,164 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-11-26 10:46:44,165 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:46:44,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-11-26 10:46:44,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=428, Unknown=0, NotChecked=0, Total=650 [2023-11-26 10:46:44,173 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 7 out of 35 [2023-11-26 10:46:44,173 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 105 places, 137 transitions, 1186 flow. Second operand has 26 states, 26 states have (on average 9.923076923076923) internal successors, (258), 26 states have internal predecessors, (258), 0 states have call successors, (0), 0 states 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 10:46:44,173 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:46:44,174 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 7 of 35 [2023-11-26 10:46:44,174 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-26 10:46:50,281 INFO L124 PetriNetUnfolderBase]: 9267/18080 cut-off events. [2023-11-26 10:46:50,282 INFO L125 PetriNetUnfolderBase]: For 27632/27632 co-relation queries the response was YES. [2023-11-26 10:46:50,385 INFO L83 FinitePrefix]: Finished finitePrefix Result has 47989 conditions, 18080 events. 9267/18080 cut-off events. For 27632/27632 co-relation queries the response was YES. Maximal size of possible extension queue 231. Compared 126944 event pairs, 1764 based on Foata normal form. 178/18256 useless extension candidates. Maximal degree in co-relation 45914. Up to 2754 conditions per place. [2023-11-26 10:46:50,486 INFO L140 encePairwiseOnDemand]: 29/35 looper letters, 590 selfloop transitions, 335 changer transitions 36/966 dead transitions. [2023-11-26 10:46:50,487 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 164 places, 966 transitions, 7349 flow [2023-11-26 10:46:50,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2023-11-26 10:46:50,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2023-11-26 10:46:50,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 1101 transitions. [2023-11-26 10:46:50,495 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5242857142857142 [2023-11-26 10:46:50,496 INFO L72 ComplementDD]: Start complementDD. Operand 60 states and 1101 transitions. [2023-11-26 10:46:50,496 INFO L73 IsDeterministic]: Start isDeterministic. Operand 60 states and 1101 transitions. [2023-11-26 10:46:50,498 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-26 10:46:50,498 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 60 states and 1101 transitions. [2023-11-26 10:46:50,504 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 61 states, 60 states have (on average 18.35) internal successors, (1101), 60 states have internal predecessors, (1101), 0 states have call successors, (0), 0 states 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 10:46:50,511 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 61 states, 61 states have (on average 35.0) internal successors, (2135), 61 states have internal predecessors, (2135), 0 states have call successors, (0), 0 states 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 10:46:50,513 INFO L81 ComplementDD]: Finished complementDD. Result has 61 states, 61 states have (on average 35.0) internal successors, (2135), 61 states have internal predecessors, (2135), 0 states have call successors, (0), 0 states 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 10:46:50,513 INFO L175 Difference]: Start difference. First operand has 105 places, 137 transitions, 1186 flow. Second operand 60 states and 1101 transitions. [2023-11-26 10:46:50,513 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 164 places, 966 transitions, 7349 flow [2023-11-26 10:46:50,805 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 164 places, 966 transitions, 7139 flow, removed 105 selfloop flow, removed 0 redundant places. [2023-11-26 10:46:50,822 INFO L231 Difference]: Finished difference. Result has 180 places, 402 transitions, 4385 flow [2023-11-26 10:46:50,823 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=35, PETRI_DIFFERENCE_MINUEND_FLOW=1150, PETRI_DIFFERENCE_MINUEND_PLACES=105, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=137, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=93, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=40, PETRI_DIFFERENCE_SUBTRAHEND_STATES=60, PETRI_FLOW=4385, PETRI_PLACES=180, PETRI_TRANSITIONS=402} [2023-11-26 10:46:50,824 INFO L281 CegarLoopForPetriNet]: 33 programPoint places, 147 predicate places. [2023-11-26 10:46:50,824 INFO L495 AbstractCegarLoop]: Abstraction has has 180 places, 402 transitions, 4385 flow [2023-11-26 10:46:50,825 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 9.923076923076923) internal successors, (258), 26 states have internal predecessors, (258), 0 states have call successors, (0), 0 states 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 10:46:50,825 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-26 10:46:50,825 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 10:46:50,837 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-26 10:46:51,032 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-26 10:46:51,032 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting t2Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 4 more)] === [2023-11-26 10:46:51,033 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 10:46:51,033 INFO L85 PathProgramCache]: Analyzing trace with hash -1522174711, now seen corresponding path program 2 times [2023-11-26 10:46:51,033 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 10:46:51,033 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [421729038] [2023-11-26 10:46:51,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 10:46:51,033 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 10:46:51,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 10:46:52,794 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 15 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 10:46:52,794 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 10:46:52,794 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [421729038] [2023-11-26 10:46:52,795 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [421729038] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 10:46:52,795 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1328469905] [2023-11-26 10:46:52,795 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-26 10:46:52,795 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 10:46:52,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 10:46:52,797 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 10:46:52,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4413c5a6-e458-49eb-ad64-06401a96b655/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-26 10:46:53,027 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-26 10:46:53,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-26 10:46:53,030 INFO L262 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 30 conjunts are in the unsatisfiable core [2023-11-26 10:46:53,038 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 10:46:53,101 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 1 [2023-11-26 10:46:53,246 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 62 treesize of output 46 [2023-11-26 10:46:53,252 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 64 [2023-11-26 10:46:53,276 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 19 [2023-11-26 10:46:53,654 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 79 treesize of output 46 [2023-11-26 10:46:54,891 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-26 10:46:54,891 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 119 treesize of output 63 [2023-11-26 10:46:54,953 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 10:46:54,953 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 10:46:56,076 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 10:46:56,077 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1328469905] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-26 10:46:56,077 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-26 10:46:56,077 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 11, 11] total 27 [2023-11-26 10:46:56,077 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [909112488] [2023-11-26 10:46:56,077 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-26 10:46:56,078 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-11-26 10:46:56,079 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 10:46:56,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-11-26 10:46:56,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=605, Unknown=0, NotChecked=0, Total=756 [2023-11-26 10:46:56,082 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 7 out of 35 [2023-11-26 10:46:56,083 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 180 places, 402 transitions, 4385 flow. Second operand has 28 states, 28 states have (on average 10.535714285714286) internal successors, (295), 28 states have internal predecessors, (295), 0 states have call successors, (0), 0 states 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 10:46:56,083 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-26 10:46:56,083 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 7 of 35 [2023-11-26 10:46:56,083 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand