java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AbstractInterpretationC.xml -s ../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf -i ../../../trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+cfa-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c6af20d [2019-09-03 21:27:03,679 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-03 21:27:03,682 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-03 21:27:03,697 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-09-03 21:27:03,698 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-09-03 21:27:03,699 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-09-03 21:27:03,700 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-09-03 21:27:03,702 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-09-03 21:27:03,704 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-09-03 21:27:03,705 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-09-03 21:27:03,706 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-09-03 21:27:03,708 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-09-03 21:27:03,708 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-03 21:27:03,709 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-03 21:27:03,710 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-03 21:27:03,711 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-03 21:27:03,712 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-03 21:27:03,713 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-03 21:27:03,715 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-03 21:27:03,717 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-03 21:27:03,719 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-03 21:27:03,720 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-03 21:27:03,722 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-03 21:27:03,722 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-03 21:27:03,725 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-09-03 21:27:03,725 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-09-03 21:27:03,726 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-09-03 21:27:03,727 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-09-03 21:27:03,727 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-09-03 21:27:03,728 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-09-03 21:27:03,728 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-09-03 21:27:03,729 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-09-03 21:27:03,730 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-09-03 21:27:03,731 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-09-03 21:27:03,732 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-09-03 21:27:03,732 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-09-03 21:27:03,733 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-09-03 21:27:03,733 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-09-03 21:27:03,733 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-03 21:27:03,734 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-03 21:27:03,735 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-03 21:27:03,736 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf [2019-09-03 21:27:03,751 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-03 21:27:03,752 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-03 21:27:03,752 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-03 21:27:03,752 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-03 21:27:03,753 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-03 21:27:03,753 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-03 21:27:03,753 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-03 21:27:03,754 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-03 21:27:03,754 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-03 21:27:03,754 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-03 21:27:03,755 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-03 21:27:03,755 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-03 21:27:03,755 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-03 21:27:03,755 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-03 21:27:03,756 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-03 21:27:03,756 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-03 21:27:03,756 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-03 21:27:03,756 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-03 21:27:03,756 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-03 21:27:03,757 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-03 21:27:03,757 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-03 21:27:03,757 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-03 21:27:03,757 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-03 21:27:03,757 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-03 21:27:03,758 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-03 21:27:03,758 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-03 21:27:03,758 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-03 21:27:03,758 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-03 21:27:03,758 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-03 21:27:03,759 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-03 21:27:03,788 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-03 21:27:03,801 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-03 21:27:03,805 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-03 21:27:03,807 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-03 21:27:03,807 INFO L275 PluginConnector]: CDTParser initialized [2019-09-03 21:27:03,808 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+cfa-reducer.c [2019-09-03 21:27:03,871 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6f3419dd3/2e2f9836367b45f39bda08e3f6f8520f/FLAG84e781509 [2019-09-03 21:27:04,385 INFO L306 CDTParser]: Found 1 translation units. [2019-09-03 21:27:04,388 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+cfa-reducer.c [2019-09-03 21:27:04,400 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6f3419dd3/2e2f9836367b45f39bda08e3f6f8520f/FLAG84e781509 [2019-09-03 21:27:04,718 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6f3419dd3/2e2f9836367b45f39bda08e3f6f8520f [2019-09-03 21:27:04,729 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-03 21:27:04,730 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-03 21:27:04,731 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-03 21:27:04,732 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-03 21:27:04,736 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-03 21:27:04,737 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 09:27:04" (1/1) ... [2019-09-03 21:27:04,740 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4e3c0b75 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:27:04, skipping insertion in model container [2019-09-03 21:27:04,740 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 09:27:04" (1/1) ... [2019-09-03 21:27:04,748 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-03 21:27:04,790 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-03 21:27:05,136 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 21:27:05,147 INFO L188 MainTranslator]: Completed pre-run [2019-09-03 21:27:05,221 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 21:27:05,239 INFO L192 MainTranslator]: Completed translation [2019-09-03 21:27:05,239 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:27:05 WrapperNode [2019-09-03 21:27:05,240 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-03 21:27:05,241 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-03 21:27:05,241 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-03 21:27:05,241 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-03 21:27:05,256 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:27:05" (1/1) ... [2019-09-03 21:27:05,256 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:27:05" (1/1) ... [2019-09-03 21:27:05,273 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:27:05" (1/1) ... [2019-09-03 21:27:05,274 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:27:05" (1/1) ... [2019-09-03 21:27:05,306 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:27:05" (1/1) ... [2019-09-03 21:27:05,311 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:27:05" (1/1) ... [2019-09-03 21:27:05,315 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:27:05" (1/1) ... [2019-09-03 21:27:05,320 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-03 21:27:05,321 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-03 21:27:05,321 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-03 21:27:05,321 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-03 21:27:05,322 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:27:05" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-03 21:27:05,406 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-03 21:27:05,407 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-03 21:27:05,407 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-03 21:27:05,407 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-03 21:27:05,407 INFO L130 BoogieDeclarations]: Found specification of procedure Id_MCDC_89 [2019-09-03 21:27:05,407 INFO L130 BoogieDeclarations]: Found specification of procedure fopen [2019-09-03 21:27:05,408 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-03 21:27:05,409 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-03 21:27:05,409 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-09-03 21:27:05,409 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-09-03 21:27:05,410 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2019-09-03 21:27:05,411 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2019-09-03 21:27:05,411 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-09-03 21:27:05,412 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-03 21:27:05,412 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-03 21:27:05,413 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2019-09-03 21:27:05,413 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-09-03 21:27:06,251 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-03 21:27:06,252 INFO L283 CfgBuilder]: Removed 0 assume(true) statements. [2019-09-03 21:27:06,253 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 09:27:06 BoogieIcfgContainer [2019-09-03 21:27:06,254 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-03 21:27:06,254 INFO L113 PluginConnector]: ------------------------Abstract Interpretation---------------------------- [2019-09-03 21:27:06,255 INFO L271 PluginConnector]: Initializing Abstract Interpretation... [2019-09-03 21:27:06,255 INFO L275 PluginConnector]: Abstract Interpretation initialized [2019-09-03 21:27:06,256 INFO L185 PluginConnector]: Executing the observer AbstractInterpretationRcfgObserver from plugin Abstract Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 09:27:06" (1/1) ... [2019-09-03 21:27:06,303 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-03 21:27:06,378 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-09-03 21:27:06,384 INFO L272 AbstractInterpreter]: Visited 2 different actions 2 times. Never merged. Never widened. Performed 21 root evaluator evaluations with a maximum evaluation depth of 0. Performed 21 inverse root evaluator evaluations with a maximum inverse evaluation depth of 0. Never found a fixpoint. Largest state had 32 variables. [2019-09-03 21:27:06,384 INFO L132 PluginConnector]: ------------------------ END Abstract Interpretation---------------------------- [2019-09-03 21:27:06,387 INFO L168 Benchmark]: Toolchain (without parser) took 1655.87 ms. Allocated memory was 138.4 MB in the beginning and 198.7 MB in the end (delta: 60.3 MB). Free memory was 84.9 MB in the beginning and 88.2 MB in the end (delta: -3.3 MB). Peak memory consumption was 57.0 MB. Max. memory is 7.1 GB. [2019-09-03 21:27:06,388 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 138.4 MB. Free memory is still 104.1 MB. There was no memory consumed. Max. memory is 7.1 GB. [2019-09-03 21:27:06,389 INFO L168 Benchmark]: CACSL2BoogieTranslator took 508.77 ms. Allocated memory was 138.4 MB in the beginning and 198.7 MB in the end (delta: 60.3 MB). Free memory was 84.9 MB in the beginning and 168.6 MB in the end (delta: -83.8 MB). Peak memory consumption was 19.3 MB. Max. memory is 7.1 GB. [2019-09-03 21:27:06,390 INFO L168 Benchmark]: Boogie Preprocessor took 80.11 ms. Allocated memory is still 198.7 MB. Free memory was 168.6 MB in the beginning and 165.1 MB in the end (delta: 3.6 MB). Peak memory consumption was 3.6 MB. Max. memory is 7.1 GB. [2019-09-03 21:27:06,391 INFO L168 Benchmark]: RCFGBuilder took 932.65 ms. Allocated memory is still 198.7 MB. Free memory was 165.1 MB in the beginning and 93.5 MB in the end (delta: 71.6 MB). Peak memory consumption was 71.6 MB. Max. memory is 7.1 GB. [2019-09-03 21:27:06,392 INFO L168 Benchmark]: Abstract Interpretation took 129.98 ms. Allocated memory is still 198.7 MB. Free memory was 93.5 MB in the beginning and 88.2 MB in the end (delta: 5.3 MB). Peak memory consumption was 5.3 MB. Max. memory is 7.1 GB. [2019-09-03 21:27:06,396 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 138.4 MB. Free memory is still 104.1 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 508.77 ms. Allocated memory was 138.4 MB in the beginning and 198.7 MB in the end (delta: 60.3 MB). Free memory was 84.9 MB in the beginning and 168.6 MB in the end (delta: -83.8 MB). Peak memory consumption was 19.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 80.11 ms. Allocated memory is still 198.7 MB. Free memory was 168.6 MB in the beginning and 165.1 MB in the end (delta: 3.6 MB). Peak memory consumption was 3.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 932.65 ms. Allocated memory is still 198.7 MB. Free memory was 165.1 MB in the beginning and 93.5 MB in the end (delta: 71.6 MB). Peak memory consumption was 71.6 MB. Max. memory is 7.1 GB. * Abstract Interpretation took 129.98 ms. Allocated memory is still 198.7 MB. Free memory was 93.5 MB in the beginning and 88.2 MB in the end (delta: 5.3 MB). Peak memory consumption was 5.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - PositiveResult [Line: 191]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location RESULT: Ultimate proved your program to be correct! Received shutdown request...