./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/goblint-regression/09-regions_19-nested_nr-deref.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/goblint-regression/09-regions_19-nested_nr-deref.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 12bbf3623faa1d8cb0ae406b9406d293839854c20d2fb62622ec841c419248fb --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 07:38:10,041 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 07:38:10,152 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2023-11-19 07:38:10,157 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 07:38:10,158 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 07:38:10,217 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 07:38:10,221 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 07:38:10,222 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 07:38:10,223 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 07:38:10,229 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 07:38:10,230 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-19 07:38:10,231 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-19 07:38:10,231 INFO L153 SettingsManager]: * Use SBE=true [2023-11-19 07:38:10,233 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 07:38:10,234 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 07:38:10,235 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 07:38:10,235 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 07:38:10,236 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 07:38:10,236 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-19 07:38:10,237 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-19 07:38:10,238 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-19 07:38:10,239 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 07:38:10,239 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-19 07:38:10,240 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-19 07:38:10,240 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 07:38:10,241 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 07:38:10,242 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 07:38:10,243 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-19 07:38:10,243 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 07:38:10,244 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 07:38:10,246 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 07:38:10,246 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 07:38:10,246 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-19 07:38:10,247 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 07:38:10,247 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-19 07:38:10,247 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-19 07:38:10,248 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 07:38:10,248 INFO L153 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-11-19 07:38:10,248 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_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 12bbf3623faa1d8cb0ae406b9406d293839854c20d2fb62622ec841c419248fb [2023-11-19 07:38:10,606 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 07:38:10,631 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 07:38:10,634 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 07:38:10,636 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 07:38:10,637 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 07:38:10,639 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/../../sv-benchmarks/c/goblint-regression/09-regions_19-nested_nr-deref.i [2023-11-19 07:38:13,813 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 07:38:14,320 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 07:38:14,321 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/sv-benchmarks/c/goblint-regression/09-regions_19-nested_nr-deref.i [2023-11-19 07:38:14,351 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/data/304d538bc/fd56b63dfe1f4b92af1196b2047131ef/FLAGfb3acd807 [2023-11-19 07:38:14,371 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/data/304d538bc/fd56b63dfe1f4b92af1196b2047131ef [2023-11-19 07:38:14,377 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 07:38:14,381 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 07:38:14,386 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 07:38:14,386 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 07:38:14,392 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 07:38:14,395 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 07:38:14" (1/1) ... [2023-11-19 07:38:14,396 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6db279c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:38:14, skipping insertion in model container [2023-11-19 07:38:14,397 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 07:38:14" (1/1) ... [2023-11-19 07:38:14,480 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 07:38:15,469 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 07:38:15,500 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 07:38:15,582 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 07:38:15,737 INFO L206 MainTranslator]: Completed translation [2023-11-19 07:38:15,737 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:38:15 WrapperNode [2023-11-19 07:38:15,738 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 07:38:15,739 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 07:38:15,739 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 07:38:15,740 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 07:38:15,749 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:38:15" (1/1) ... [2023-11-19 07:38:15,789 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:38:15" (1/1) ... [2023-11-19 07:38:15,852 INFO L138 Inliner]: procedures = 370, calls = 29, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 116 [2023-11-19 07:38:15,853 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 07:38:15,854 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 07:38:15,854 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 07:38:15,855 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 07:38:15,867 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:38:15" (1/1) ... [2023-11-19 07:38:15,868 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:38:15" (1/1) ... [2023-11-19 07:38:15,887 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:38:15" (1/1) ... [2023-11-19 07:38:15,901 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:38:15" (1/1) ... [2023-11-19 07:38:15,913 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:38:15" (1/1) ... [2023-11-19 07:38:15,917 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:38:15" (1/1) ... [2023-11-19 07:38:15,920 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:38:15" (1/1) ... [2023-11-19 07:38:15,923 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:38:15" (1/1) ... [2023-11-19 07:38:15,927 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 07:38:15,928 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 07:38:15,929 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 07:38:15,929 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 07:38:15,930 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:38:15" (1/1) ... [2023-11-19 07:38:15,937 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 07:38:15,952 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:38:15,966 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 07:38:15,987 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 07:38:16,064 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-19 07:38:16,065 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-19 07:38:16,065 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-19 07:38:16,066 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-19 07:38:16,067 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-19 07:38:16,067 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-11-19 07:38:16,067 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-19 07:38:16,067 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 07:38:16,067 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-19 07:38:16,068 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-11-19 07:38:16,068 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-11-19 07:38:16,068 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 07:38:16,069 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 07:38:16,082 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-11-19 07:38:16,345 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 07:38:16,348 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 07:38:16,813 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 07:38:16,827 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 07:38:16,827 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-19 07:38:16,835 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 07:38:16 BoogieIcfgContainer [2023-11-19 07:38:16,835 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 07:38:16,838 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 07:38:16,838 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 07:38:16,842 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 07:38:16,842 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 07:38:14" (1/3) ... [2023-11-19 07:38:16,844 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@508b6f78 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 07:38:16, skipping insertion in model container [2023-11-19 07:38:16,845 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:38:15" (2/3) ... [2023-11-19 07:38:16,849 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@508b6f78 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 07:38:16, skipping insertion in model container [2023-11-19 07:38:16,849 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 07:38:16" (3/3) ... [2023-11-19 07:38:16,851 INFO L112 eAbstractionObserver]: Analyzing ICFG 09-regions_19-nested_nr-deref.i [2023-11-19 07:38:16,875 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 07:38:16,876 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 39 error locations. [2023-11-19 07:38:16,876 INFO L514 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-11-19 07:38:17,029 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-11-19 07:38:17,095 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 184 places, 184 transitions, 372 flow [2023-11-19 07:38:17,212 INFO L124 PetriNetUnfolderBase]: 4/183 cut-off events. [2023-11-19 07:38:17,212 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-19 07:38:17,219 INFO L83 FinitePrefix]: Finished finitePrefix Result has 187 conditions, 183 events. 4/183 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 196 event pairs, 0 based on Foata normal form. 0/140 useless extension candidates. Maximal degree in co-relation 97. Up to 2 conditions per place. [2023-11-19 07:38:17,220 INFO L82 GeneralOperation]: Start removeDead. Operand has 184 places, 184 transitions, 372 flow [2023-11-19 07:38:17,234 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 183 places, 183 transitions, 369 flow [2023-11-19 07:38:17,239 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-11-19 07:38:17,254 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 183 places, 183 transitions, 369 flow [2023-11-19 07:38:17,258 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 183 places, 183 transitions, 369 flow [2023-11-19 07:38:17,259 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 183 places, 183 transitions, 369 flow [2023-11-19 07:38:17,306 INFO L124 PetriNetUnfolderBase]: 4/183 cut-off events. [2023-11-19 07:38:17,307 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-19 07:38:17,308 INFO L83 FinitePrefix]: Finished finitePrefix Result has 187 conditions, 183 events. 4/183 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 196 event pairs, 0 based on Foata normal form. 0/140 useless extension candidates. Maximal degree in co-relation 97. Up to 2 conditions per place. [2023-11-19 07:38:17,312 INFO L119 LiptonReduction]: Number of co-enabled transitions 3192 [2023-11-19 07:38:50,002 WARN L293 SmtUtils]: Spent 9.34s on a formula simplification. DAG size of input: 227 DAG size of output: 209 (called from [L 279] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2023-11-19 07:39:03,517 WARN L293 SmtUtils]: Spent 9.89s on a formula simplification. DAG size of input: 233 DAG size of output: 218 (called from [L 279] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2023-11-19 07:39:07,544 INFO L134 LiptonReduction]: Checked pairs total: 13672 [2023-11-19 07:39:07,544 INFO L136 LiptonReduction]: Total number of compositions: 239 [2023-11-19 07:39:07,566 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 07:39:07,571 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@37361c63, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-11-19 07:39:07,571 INFO L358 AbstractCegarLoop]: Starting to check reachability of 52 error locations. [2023-11-19 07:39:07,574 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-11-19 07:39:07,574 INFO L124 PetriNetUnfolderBase]: 1/2 cut-off events. [2023-11-19 07:39:07,575 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-19 07:39:07,575 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-19 07:39:07,575 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-11-19 07:39:07,576 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 49 more)] === [2023-11-19 07:39:07,581 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:39:07,581 INFO L85 PathProgramCache]: Analyzing trace with hash 21322, now seen corresponding path program 1 times [2023-11-19 07:39:07,591 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:39:07,591 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1494893914] [2023-11-19 07:39:07,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:39:07,592 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:39:07,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:39:07,737 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 07:39:07,737 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:39:07,738 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1494893914] [2023-11-19 07:39:07,738 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1494893914] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 07:39:07,739 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 07:39:07,739 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-19 07:39:07,740 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561526433] [2023-11-19 07:39:07,741 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:39:07,750 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-19 07:39:07,755 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:39:07,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-19 07:39:07,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 07:39:07,779 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 180 out of 423 [2023-11-19 07:39:07,782 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 63 places, 60 transitions, 123 flow. Second operand has 2 states, 2 states have (on average 181.0) internal successors, (362), 2 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) [2023-11-19 07:39:07,783 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-19 07:39:07,783 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 180 of 423 [2023-11-19 07:39:07,784 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-19 07:39:08,004 INFO L124 PetriNetUnfolderBase]: 137/342 cut-off events. [2023-11-19 07:39:08,004 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-19 07:39:08,008 INFO L83 FinitePrefix]: Finished finitePrefix Result has 650 conditions, 342 events. 137/342 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 31. Compared 1674 event pairs, 136 based on Foata normal form. 0/214 useless extension candidates. Maximal degree in co-relation 633. Up to 304 conditions per place. [2023-11-19 07:39:08,013 INFO L140 encePairwiseOnDemand]: 403/423 looper letters, 31 selfloop transitions, 0 changer transitions 0/40 dead transitions. [2023-11-19 07:39:08,013 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 44 places, 40 transitions, 145 flow [2023-11-19 07:39:08,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-19 07:39:08,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2023-11-19 07:39:08,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 411 transitions. [2023-11-19 07:39:08,039 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4858156028368794 [2023-11-19 07:39:08,041 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 411 transitions. [2023-11-19 07:39:08,042 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 411 transitions. [2023-11-19 07:39:08,046 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-19 07:39:08,049 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 411 transitions. [2023-11-19 07:39:08,054 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 205.5) internal successors, (411), 2 states have internal predecessors, (411), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:08,060 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 423.0) internal successors, (1269), 3 states have internal predecessors, (1269), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:08,061 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 423.0) internal successors, (1269), 3 states have internal predecessors, (1269), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:08,064 INFO L175 Difference]: Start difference. First operand has 63 places, 60 transitions, 123 flow. Second operand 2 states and 411 transitions. [2023-11-19 07:39:08,065 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 44 places, 40 transitions, 145 flow [2023-11-19 07:39:08,067 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 43 places, 40 transitions, 144 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-11-19 07:39:08,070 INFO L231 Difference]: Finished difference. Result has 43 places, 40 transitions, 82 flow [2023-11-19 07:39:08,072 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=423, PETRI_DIFFERENCE_MINUEND_FLOW=82, PETRI_DIFFERENCE_MINUEND_PLACES=42, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=40, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=40, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=82, PETRI_PLACES=43, PETRI_TRANSITIONS=40} [2023-11-19 07:39:08,077 INFO L281 CegarLoopForPetriNet]: 63 programPoint places, -20 predicate places. [2023-11-19 07:39:08,077 INFO L495 AbstractCegarLoop]: Abstraction has has 43 places, 40 transitions, 82 flow [2023-11-19 07:39:08,078 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 181.0) internal successors, (362), 2 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) [2023-11-19 07:39:08,078 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-19 07:39:08,078 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-11-19 07:39:08,078 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 07:39:08,079 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 49 more)] === [2023-11-19 07:39:08,079 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:39:08,079 INFO L85 PathProgramCache]: Analyzing trace with hash 21316, now seen corresponding path program 1 times [2023-11-19 07:39:08,080 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:39:08,080 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1152629075] [2023-11-19 07:39:08,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:39:08,081 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:39:08,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:39:08,299 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 07:39:08,300 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:39:08,300 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1152629075] [2023-11-19 07:39:08,301 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1152629075] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 07:39:08,301 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 07:39:08,301 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-19 07:39:08,302 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497599850] [2023-11-19 07:39:08,306 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:39:08,307 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 07:39:08,307 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:39:08,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 07:39:08,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 07:39:08,333 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 174 out of 423 [2023-11-19 07:39:08,334 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 43 places, 40 transitions, 82 flow. Second operand has 3 states, 3 states have (on average 174.66666666666666) internal successors, (524), 3 states have internal predecessors, (524), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:08,334 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-19 07:39:08,334 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 174 of 423 [2023-11-19 07:39:08,335 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-19 07:39:08,582 INFO L124 PetriNetUnfolderBase]: 137/343 cut-off events. [2023-11-19 07:39:08,582 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-19 07:39:08,584 INFO L83 FinitePrefix]: Finished finitePrefix Result has 652 conditions, 343 events. 137/343 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 30. Compared 1690 event pairs, 136 based on Foata normal form. 0/215 useless extension candidates. Maximal degree in co-relation 649. Up to 304 conditions per place. [2023-11-19 07:39:08,586 INFO L140 encePairwiseOnDemand]: 418/423 looper letters, 30 selfloop transitions, 2 changer transitions 0/41 dead transitions. [2023-11-19 07:39:08,586 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 45 places, 41 transitions, 148 flow [2023-11-19 07:39:08,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 07:39:08,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-19 07:39:08,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 557 transitions. [2023-11-19 07:39:08,590 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4389282899921198 [2023-11-19 07:39:08,590 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 557 transitions. [2023-11-19 07:39:08,590 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 557 transitions. [2023-11-19 07:39:08,591 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-19 07:39:08,591 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 557 transitions. [2023-11-19 07:39:08,593 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 185.66666666666666) internal successors, (557), 3 states have internal predecessors, (557), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:08,598 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 423.0) internal successors, (1692), 4 states have internal predecessors, (1692), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:08,599 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 423.0) internal successors, (1692), 4 states have internal predecessors, (1692), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:08,599 INFO L175 Difference]: Start difference. First operand has 43 places, 40 transitions, 82 flow. Second operand 3 states and 557 transitions. [2023-11-19 07:39:08,600 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 45 places, 41 transitions, 148 flow [2023-11-19 07:39:08,600 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 45 places, 41 transitions, 148 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-11-19 07:39:08,602 INFO L231 Difference]: Finished difference. Result has 46 places, 41 transitions, 98 flow [2023-11-19 07:39:08,602 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=423, PETRI_DIFFERENCE_MINUEND_FLOW=82, PETRI_DIFFERENCE_MINUEND_PLACES=43, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=40, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=38, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=98, PETRI_PLACES=46, PETRI_TRANSITIONS=41} [2023-11-19 07:39:08,604 INFO L281 CegarLoopForPetriNet]: 63 programPoint places, -17 predicate places. [2023-11-19 07:39:08,604 INFO L495 AbstractCegarLoop]: Abstraction has has 46 places, 41 transitions, 98 flow [2023-11-19 07:39:08,606 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 174.66666666666666) internal successors, (524), 3 states have internal predecessors, (524), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:08,606 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-19 07:39:08,607 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1] [2023-11-19 07:39:08,608 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 07:39:08,609 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 49 more)] === [2023-11-19 07:39:08,617 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:39:08,617 INFO L85 PathProgramCache]: Analyzing trace with hash 659358, now seen corresponding path program 1 times [2023-11-19 07:39:08,617 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:39:08,617 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986012978] [2023-11-19 07:39:08,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:39:08,618 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:39:08,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:39:08,781 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 07:39:08,781 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:39:08,782 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986012978] [2023-11-19 07:39:08,782 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1986012978] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 07:39:08,782 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [798006972] [2023-11-19 07:39:08,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:39:08,783 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:39:08,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:39:08,785 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:39:08,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 07:39:08,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:39:08,910 INFO L262 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 07:39:08,914 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:39:08,961 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 07:39:08,961 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 07:39:08,981 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 07:39:08,981 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [798006972] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 07:39:08,982 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 07:39:08,982 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 5 [2023-11-19 07:39:08,982 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453796473] [2023-11-19 07:39:08,982 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 07:39:08,982 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 07:39:08,983 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:39:08,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 07:39:08,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-11-19 07:39:09,033 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 173 out of 423 [2023-11-19 07:39:09,035 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 46 places, 41 transitions, 98 flow. Second operand has 7 states, 7 states have (on average 174.14285714285714) internal successors, (1219), 7 states have internal predecessors, (1219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:09,035 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-19 07:39:09,036 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 173 of 423 [2023-11-19 07:39:09,036 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-19 07:39:09,437 INFO L124 PetriNetUnfolderBase]: 137/346 cut-off events. [2023-11-19 07:39:09,438 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-11-19 07:39:09,439 INFO L83 FinitePrefix]: Finished finitePrefix Result has 670 conditions, 346 events. 137/346 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 30. Compared 1692 event pairs, 136 based on Foata normal form. 0/218 useless extension candidates. Maximal degree in co-relation 665. Up to 304 conditions per place. [2023-11-19 07:39:09,442 INFO L140 encePairwiseOnDemand]: 418/423 looper letters, 30 selfloop transitions, 5 changer transitions 0/44 dead transitions. [2023-11-19 07:39:09,443 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 51 places, 44 transitions, 180 flow [2023-11-19 07:39:09,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 07:39:09,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-11-19 07:39:09,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1082 transitions. [2023-11-19 07:39:09,448 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.42631993695823484 [2023-11-19 07:39:09,448 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1082 transitions. [2023-11-19 07:39:09,449 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1082 transitions. [2023-11-19 07:39:09,450 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-19 07:39:09,450 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1082 transitions. [2023-11-19 07:39:09,454 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 180.33333333333334) internal successors, (1082), 6 states have internal predecessors, (1082), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:09,460 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 423.0) internal successors, (2961), 7 states have internal predecessors, (2961), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:09,463 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 423.0) internal successors, (2961), 7 states have internal predecessors, (2961), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:09,463 INFO L175 Difference]: Start difference. First operand has 46 places, 41 transitions, 98 flow. Second operand 6 states and 1082 transitions. [2023-11-19 07:39:09,463 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 51 places, 44 transitions, 180 flow [2023-11-19 07:39:09,464 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 50 places, 44 transitions, 176 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-11-19 07:39:09,466 INFO L231 Difference]: Finished difference. Result has 53 places, 44 transitions, 142 flow [2023-11-19 07:39:09,466 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=423, PETRI_DIFFERENCE_MINUEND_FLOW=94, PETRI_DIFFERENCE_MINUEND_PLACES=45, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=41, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=38, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=142, PETRI_PLACES=53, PETRI_TRANSITIONS=44} [2023-11-19 07:39:09,467 INFO L281 CegarLoopForPetriNet]: 63 programPoint places, -10 predicate places. [2023-11-19 07:39:09,467 INFO L495 AbstractCegarLoop]: Abstraction has has 53 places, 44 transitions, 142 flow [2023-11-19 07:39:09,469 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 174.14285714285714) internal successors, (1219), 7 states have internal predecessors, (1219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:09,469 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-19 07:39:09,469 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 1, 1] [2023-11-19 07:39:09,500 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-19 07:39:09,690 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:39:09,690 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 49 more)] === [2023-11-19 07:39:09,691 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:39:09,691 INFO L85 PathProgramCache]: Analyzing trace with hash -1833330236, now seen corresponding path program 2 times [2023-11-19 07:39:09,691 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:39:09,691 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1881883417] [2023-11-19 07:39:09,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:39:09,692 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:39:09,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:39:09,838 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 07:39:09,838 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:39:09,839 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1881883417] [2023-11-19 07:39:09,839 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1881883417] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 07:39:09,839 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [323347349] [2023-11-19 07:39:09,839 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-19 07:39:09,840 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:39:09,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:39:09,841 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:39:09,845 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 07:39:09,961 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2023-11-19 07:39:09,962 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 07:39:09,963 INFO L262 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-19 07:39:09,965 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:39:10,084 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 07:39:10,085 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 07:39:10,085 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [323347349] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 07:39:10,085 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 07:39:10,085 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [5] total 6 [2023-11-19 07:39:10,091 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128251643] [2023-11-19 07:39:10,091 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:39:10,092 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 07:39:10,092 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:39:10,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 07:39:10,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2023-11-19 07:39:10,330 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 175 out of 423 [2023-11-19 07:39:10,331 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 53 places, 44 transitions, 142 flow. Second operand has 3 states, 3 states have (on average 176.0) internal successors, (528), 3 states have internal predecessors, (528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:10,331 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-19 07:39:10,331 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 175 of 423 [2023-11-19 07:39:10,332 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-19 07:39:10,549 INFO L124 PetriNetUnfolderBase]: 130/339 cut-off events. [2023-11-19 07:39:10,549 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-11-19 07:39:10,551 INFO L83 FinitePrefix]: Finished finitePrefix Result has 658 conditions, 339 events. 130/339 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 29. Compared 1642 event pairs, 97 based on Foata normal form. 17/237 useless extension candidates. Maximal degree in co-relation 650. Up to 222 conditions per place. [2023-11-19 07:39:10,555 INFO L140 encePairwiseOnDemand]: 417/423 looper letters, 47 selfloop transitions, 2 changer transitions 0/57 dead transitions. [2023-11-19 07:39:10,555 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 52 places, 57 transitions, 250 flow [2023-11-19 07:39:10,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 07:39:10,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-11-19 07:39:10,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 574 transitions. [2023-11-19 07:39:10,559 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4523246650906225 [2023-11-19 07:39:10,560 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 574 transitions. [2023-11-19 07:39:10,560 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 574 transitions. [2023-11-19 07:39:10,560 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-19 07:39:10,561 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 574 transitions. [2023-11-19 07:39:10,563 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 191.33333333333334) internal successors, (574), 3 states have internal predecessors, (574), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:10,567 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 423.0) internal successors, (1692), 4 states have internal predecessors, (1692), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:10,569 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 423.0) internal successors, (1692), 4 states have internal predecessors, (1692), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:10,570 INFO L175 Difference]: Start difference. First operand has 53 places, 44 transitions, 142 flow. Second operand 3 states and 574 transitions. [2023-11-19 07:39:10,570 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 52 places, 57 transitions, 250 flow [2023-11-19 07:39:10,572 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 51 places, 57 transitions, 236 flow, removed 6 selfloop flow, removed 1 redundant places. [2023-11-19 07:39:10,574 INFO L231 Difference]: Finished difference. Result has 52 places, 41 transitions, 114 flow [2023-11-19 07:39:10,575 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=423, PETRI_DIFFERENCE_MINUEND_FLOW=106, PETRI_DIFFERENCE_MINUEND_PLACES=49, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=41, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=39, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=114, PETRI_PLACES=52, PETRI_TRANSITIONS=41} [2023-11-19 07:39:10,576 INFO L281 CegarLoopForPetriNet]: 63 programPoint places, -11 predicate places. [2023-11-19 07:39:10,576 INFO L495 AbstractCegarLoop]: Abstraction has has 52 places, 41 transitions, 114 flow [2023-11-19 07:39:10,577 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 176.0) internal successors, (528), 3 states have internal predecessors, (528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:10,577 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-19 07:39:10,577 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 1, 1, 1, 1, 1] [2023-11-19 07:39:10,608 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 07:39:10,791 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:39:10,791 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 49 more)] === [2023-11-19 07:39:10,792 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:39:10,792 INFO L85 PathProgramCache]: Analyzing trace with hash -1935969300, now seen corresponding path program 1 times [2023-11-19 07:39:10,792 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:39:10,792 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1567727319] [2023-11-19 07:39:10,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:39:10,793 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:39:10,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:39:11,105 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 07:39:11,105 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:39:11,106 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1567727319] [2023-11-19 07:39:11,106 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1567727319] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 07:39:11,106 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2017360594] [2023-11-19 07:39:11,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:39:11,107 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:39:11,107 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:39:11,112 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:39:11,139 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 07:39:11,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:39:11,269 INFO L262 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-19 07:39:11,271 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:39:11,296 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 07:39:11,296 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 07:39:11,377 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 07:39:11,377 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2017360594] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 07:39:11,378 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 07:39:11,378 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-11-19 07:39:11,378 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278171361] [2023-11-19 07:39:11,378 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 07:39:11,380 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-19 07:39:11,380 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:39:11,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-19 07:39:11,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-11-19 07:39:11,437 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 173 out of 423 [2023-11-19 07:39:11,441 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 52 places, 41 transitions, 114 flow. Second operand has 13 states, 13 states have (on average 174.23076923076923) internal successors, (2265), 13 states have internal predecessors, (2265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:11,441 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-19 07:39:11,442 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 173 of 423 [2023-11-19 07:39:11,442 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-11-19 07:39:12,131 INFO L124 PetriNetUnfolderBase]: 130/333 cut-off events. [2023-11-19 07:39:12,131 INFO L125 PetriNetUnfolderBase]: For 35/35 co-relation queries the response was YES. [2023-11-19 07:39:12,132 INFO L83 FinitePrefix]: Finished finitePrefix Result has 702 conditions, 333 events. 130/333 cut-off events. For 35/35 co-relation queries the response was YES. Maximal size of possible extension queue 29. Compared 1570 event pairs, 129 based on Foata normal form. 6/227 useless extension candidates. Maximal degree in co-relation 692. Up to 288 conditions per place. [2023-11-19 07:39:12,136 INFO L140 encePairwiseOnDemand]: 420/423 looper letters, 28 selfloop transitions, 11 changer transitions 0/47 dead transitions. [2023-11-19 07:39:12,136 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 63 places, 47 transitions, 228 flow [2023-11-19 07:39:12,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-19 07:39:12,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2023-11-19 07:39:12,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 2121 transitions. [2023-11-19 07:39:12,147 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4178486997635934 [2023-11-19 07:39:12,148 INFO L72 ComplementDD]: Start complementDD. Operand 12 states and 2121 transitions. [2023-11-19 07:39:12,148 INFO L73 IsDeterministic]: Start isDeterministic. Operand 12 states and 2121 transitions. [2023-11-19 07:39:12,150 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-11-19 07:39:12,151 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 12 states and 2121 transitions. [2023-11-19 07:39:12,158 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 13 states, 12 states have (on average 176.75) internal successors, (2121), 12 states have internal predecessors, (2121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:12,167 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 13 states, 13 states have (on average 423.0) internal successors, (5499), 13 states have internal predecessors, (5499), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:12,170 INFO L81 ComplementDD]: Finished complementDD. Result has 13 states, 13 states have (on average 423.0) internal successors, (5499), 13 states have internal predecessors, (5499), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:12,170 INFO L175 Difference]: Start difference. First operand has 52 places, 41 transitions, 114 flow. Second operand 12 states and 2121 transitions. [2023-11-19 07:39:12,170 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 63 places, 47 transitions, 228 flow [2023-11-19 07:39:12,172 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 61 places, 47 transitions, 224 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-11-19 07:39:12,174 INFO L231 Difference]: Finished difference. Result has 67 places, 47 transitions, 194 flow [2023-11-19 07:39:12,174 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=423, PETRI_DIFFERENCE_MINUEND_FLOW=110, PETRI_DIFFERENCE_MINUEND_PLACES=50, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=41, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=35, PETRI_DIFFERENCE_SUBTRAHEND_STATES=12, PETRI_FLOW=194, PETRI_PLACES=67, PETRI_TRANSITIONS=47} [2023-11-19 07:39:12,175 INFO L281 CegarLoopForPetriNet]: 63 programPoint places, 4 predicate places. [2023-11-19 07:39:12,176 INFO L495 AbstractCegarLoop]: Abstraction has has 67 places, 47 transitions, 194 flow [2023-11-19 07:39:12,177 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 174.23076923076923) internal successors, (2265), 13 states have internal predecessors, (2265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:12,177 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-11-19 07:39:12,178 INFO L208 CegarLoopForPetriNet]: trace histogram [10, 1, 1, 1, 1, 1] [2023-11-19 07:39:12,204 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 07:39:12,391 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe839c44-31b5-4238-87c1-d605087d7839/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:39:12,392 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 49 more)] === [2023-11-19 07:39:12,392 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:39:12,392 INFO L85 PathProgramCache]: Analyzing trace with hash -231028180, now seen corresponding path program 2 times [2023-11-19 07:39:12,392 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:39:12,392 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [50340147] [2023-11-19 07:39:12,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:39:12,392 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:39:12,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:39:12,727 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-11-19 07:39:12,728 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:39:12,728 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [50340147] [2023-11-19 07:39:12,728 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [50340147] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 07:39:12,728 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 07:39:12,728 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 07:39:12,729 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442833920] [2023-11-19 07:39:12,729 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:39:12,729 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 07:39:12,729 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:39:12,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 07:39:12,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 07:39:12,874 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 166 out of 423 [2023-11-19 07:39:12,874 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 67 places, 47 transitions, 194 flow. Second operand has 3 states, 3 states have (on average 168.0) internal successors, (504), 3 states have internal predecessors, (504), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:39:12,874 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-11-19 07:39:12,875 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 166 of 423 [2023-11-19 07:39:12,875 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand