/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SHALLOWEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-64bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/aws-c-common/aws_array_list_clean_up_harness.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 20:29:31,962 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 20:29:31,965 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 20:29:32,007 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 20:29:32,007 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 20:29:32,020 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 20:29:32,021 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 20:29:32,024 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 20:29:32,029 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 20:29:32,031 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 20:29:32,032 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 20:29:32,035 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 20:29:32,036 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 20:29:32,038 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 20:29:32,039 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 20:29:32,041 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 20:29:32,044 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 20:29:32,045 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 20:29:32,046 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 20:29:32,054 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 20:29:32,055 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 20:29:32,058 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 20:29:32,059 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 20:29:32,060 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 20:29:32,064 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 20:29:32,076 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 20:29:32,076 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 20:29:32,078 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 20:29:32,078 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-64bit-Automizer_Default.epf [2020-08-18 20:29:32,121 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 20:29:32,122 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 20:29:32,124 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 20:29:32,124 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 20:29:32,124 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 20:29:32,125 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 20:29:32,125 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 20:29:32,125 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 20:29:32,125 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 20:29:32,125 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 20:29:32,127 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 20:29:32,127 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 20:29:32,127 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 20:29:32,128 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 20:29:32,128 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 20:29:32,128 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 20:29:32,128 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 20:29:32,128 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 20:29:32,129 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 20:29:32,129 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 20:29:32,129 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 20:29:32,129 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 20:29:32,129 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 20:29:32,130 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 20:29:32,130 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 20:29:32,130 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 20:29:32,130 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-08-18 20:29:32,130 INFO L138 SettingsManager]: * To the following directory=dump/ Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST; [2020-08-18 20:29:32,429 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 20:29:32,442 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 20:29:32,445 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 20:29:32,447 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 20:29:32,447 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 20:29:32,448 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/aws-c-common/aws_array_list_clean_up_harness.i [2020-08-18 20:29:32,509 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/de6e3d045/cc5b0035d5614da1a52b00776319f4a0/FLAG897d36b0c [2020-08-18 20:29:33,362 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 20:29:33,363 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/aws-c-common/aws_array_list_clean_up_harness.i [2020-08-18 20:29:33,395 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/de6e3d045/cc5b0035d5614da1a52b00776319f4a0/FLAG897d36b0c [2020-08-18 20:29:33,898 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/de6e3d045/cc5b0035d5614da1a52b00776319f4a0 [2020-08-18 20:29:33,906 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 20:29:33,908 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 20:29:33,908 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 20:29:33,909 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 20:29:33,912 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 20:29:33,913 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:29:33" (1/1) ... [2020-08-18 20:29:33,916 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@409f7ae5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:29:33, skipping insertion in model container [2020-08-18 20:29:33,916 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:29:33" (1/1) ... [2020-08-18 20:29:33,923 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 20:29:34,037 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 20:29:34,434 WARN L612 FunctionHandler]: implicit declaration of function __builtin_uaddl_overflow [2020-08-18 20:29:34,441 WARN L612 FunctionHandler]: implicit declaration of function __builtin_umull_overflow [2020-08-18 20:29:35,186 WARN L612 FunctionHandler]: implicit declaration of function __builtin_va_copy [2020-08-18 20:29:35,253 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:35,254 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:35,255 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:35,256 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:35,257 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:35,272 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:35,272 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:35,274 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:35,275 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:35,278 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:35,279 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:35,280 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:35,280 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:35,702 WARN L612 FunctionHandler]: implicit declaration of function __atomic_load_n [2020-08-18 20:29:35,703 WARN L612 FunctionHandler]: implicit declaration of function __atomic_store_n [2020-08-18 20:29:35,706 WARN L612 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2020-08-18 20:29:35,711 WARN L612 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2020-08-18 20:29:35,715 WARN L612 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2020-08-18 20:29:35,716 WARN L612 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2020-08-18 20:29:35,716 WARN L612 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2020-08-18 20:29:35,717 WARN L612 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2020-08-18 20:29:35,719 WARN L612 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2020-08-18 20:29:35,721 WARN L612 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2020-08-18 20:29:35,857 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:35,865 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:35,924 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:29:35,957 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 20:29:35,978 WARN L612 FunctionHandler]: implicit declaration of function __builtin_uaddl_overflow [2020-08-18 20:29:35,979 WARN L612 FunctionHandler]: implicit declaration of function __builtin_umull_overflow [2020-08-18 20:29:36,029 WARN L612 FunctionHandler]: implicit declaration of function __builtin_va_copy [2020-08-18 20:29:36,068 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:36,069 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:36,069 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:36,075 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:36,076 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:36,083 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:36,084 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:36,085 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:36,086 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:36,087 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:36,087 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:36,088 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:36,088 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:36,124 WARN L612 FunctionHandler]: implicit declaration of function __atomic_load_n [2020-08-18 20:29:36,125 WARN L612 FunctionHandler]: implicit declaration of function __atomic_store_n [2020-08-18 20:29:36,126 WARN L612 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2020-08-18 20:29:36,127 WARN L612 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2020-08-18 20:29:36,128 WARN L612 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2020-08-18 20:29:36,129 WARN L612 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2020-08-18 20:29:36,129 WARN L612 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2020-08-18 20:29:36,130 WARN L612 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2020-08-18 20:29:36,130 WARN L612 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2020-08-18 20:29:36,131 WARN L612 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2020-08-18 20:29:36,151 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:36,157 WARN L1484 CHandler]: Possible shadowing of function index [2020-08-18 20:29:36,178 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:29:36,198 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator has thrown an exception: de.uni_freiburg.informatik.ultimate.boogie.typechecker.TypeCheckException: Type mismatch (real != int) in at de.uni_freiburg.informatik.ultimate.boogie.TypeErrorReporter.report(TypeErrorReporter.java:52) at de.uni_freiburg.informatik.ultimate.boogie.typechecker.TypeCheckHelper.typeCheckAssignStatement(TypeCheckHelper.java:289) at de.uni_freiburg.informatik.ultimate.boogie.StatementFactory.constructAssignmentStatement(StatementFactory.java:70) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.chandler.MemoryHandler.constructMemsetLoopBody(MemoryHandler.java:1647) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.chandler.MemoryHandler.declareMemset(MemoryHandler.java:1747) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.chandler.MemoryHandler.declareMemoryModelInfrastructure(MemoryHandler.java:505) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.CHandler.visit(CHandler.java:610) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.MainDispatcher.dispatch(MainDispatcher.java:269) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.MainTranslator.performMainRun(MainTranslator.java:244) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.MainTranslator.translate(MainTranslator.java:206) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.MainTranslator.run(MainTranslator.java:115) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.MainTranslator.(MainTranslator.java:93) at de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver.finish(CACSL2BoogieTranslatorObserver.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:317) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) [2020-08-18 20:29:36,213 INFO L168 Benchmark]: Toolchain (without parser) took 2300.87 ms. Allocated memory was 141.0 MB in the beginning and 227.0 MB in the end (delta: 86.0 MB). Free memory was 96.8 MB in the beginning and 142.7 MB in the end (delta: -45.9 MB). Peak memory consumption was 48.9 MB. Max. memory is 7.1 GB. [2020-08-18 20:29:36,214 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 141.0 MB. Free memory was 122.5 MB in the beginning and 122.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-18 20:29:36,219 INFO L168 Benchmark]: CACSL2BoogieTranslator took 2298.17 ms. Allocated memory was 141.0 MB in the beginning and 227.0 MB in the end (delta: 86.0 MB). Free memory was 96.4 MB in the beginning and 142.7 MB in the end (delta: -46.3 MB). Peak memory consumption was 48.5 MB. Max. memory is 7.1 GB. [2020-08-18 20:29:36,222 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 141.0 MB. Free memory was 122.5 MB in the beginning and 122.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 2298.17 ms. Allocated memory was 141.0 MB in the beginning and 227.0 MB in the end (delta: 86.0 MB). Free memory was 96.4 MB in the beginning and 142.7 MB in the end (delta: -46.3 MB). Peak memory consumption was 48.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - ExceptionOrErrorResult: TypeCheckException: Type mismatch (real != int) in de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: TypeCheckException: Type mismatch (real != int) in : de.uni_freiburg.informatik.ultimate.boogie.TypeErrorReporter.report(TypeErrorReporter.java:52) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request...