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/float-benchs/water_pid.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-112bae1 [2019-09-11 16:04:40,749 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-11 16:04:40,752 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-11 16:04:40,764 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-09-11 16:04:40,764 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-09-11 16:04:40,765 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-09-11 16:04:40,767 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-09-11 16:04:40,769 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-09-11 16:04:40,770 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-09-11 16:04:40,771 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-09-11 16:04:40,772 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-09-11 16:04:40,773 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-09-11 16:04:40,773 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-11 16:04:40,774 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-11 16:04:40,775 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-11 16:04:40,776 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-11 16:04:40,777 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-11 16:04:40,778 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-11 16:04:40,780 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-11 16:04:40,782 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-11 16:04:40,784 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-11 16:04:40,785 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-11 16:04:40,786 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-11 16:04:40,787 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-11 16:04:40,789 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-09-11 16:04:40,792 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-09-11 16:04:40,793 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-09-11 16:04:40,794 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-09-11 16:04:40,795 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-09-11 16:04:40,796 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-09-11 16:04:40,796 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-09-11 16:04:40,796 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-09-11 16:04:40,797 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-09-11 16:04:40,797 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-11 16:04:40,798 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-11 16:04:40,798 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-11 16:04:40,799 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 [2019-09-11 16:04:40,815 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-11 16:04:40,815 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-11 16:04:40,815 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-11 16:04:40,816 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-11 16:04:40,816 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-11 16:04:40,817 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-11 16:04:40,817 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-11 16:04:40,817 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-11 16:04:40,817 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-11 16:04:40,817 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-11 16:04:40,818 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-11 16:04:40,818 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-11 16:04:40,819 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-11 16:04:40,819 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-11 16:04:40,819 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-11 16:04:40,819 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-11 16:04:40,819 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-11 16:04:40,820 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-11 16:04:40,820 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-11 16:04:40,820 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-11 16:04:40,820 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-11 16:04:40,820 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-11 16:04:40,821 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-11 16:04:40,821 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-11 16:04:40,821 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-11 16:04:40,821 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-11 16:04:40,821 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-11 16:04:40,822 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-11 16:04:40,822 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-11 16:04:40,822 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-11 16:04:40,851 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-11 16:04:40,864 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-11 16:04:40,868 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-11 16:04:40,869 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-11 16:04:40,870 INFO L275 PluginConnector]: CDTParser initialized [2019-09-11 16:04:40,870 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/float-benchs/water_pid.c [2019-09-11 16:04:40,934 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/20653fac9/ea04bdd932b64c20baca51863bd38e52/FLAG10b8db305 [2019-09-11 16:04:41,390 INFO L306 CDTParser]: Found 1 translation units. [2019-09-11 16:04:41,390 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/float-benchs/water_pid.c [2019-09-11 16:04:41,396 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/20653fac9/ea04bdd932b64c20baca51863bd38e52/FLAG10b8db305 [2019-09-11 16:04:41,728 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/20653fac9/ea04bdd932b64c20baca51863bd38e52 [2019-09-11 16:04:41,737 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-11 16:04:41,738 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-11 16:04:41,740 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-11 16:04:41,740 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-11 16:04:41,743 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-11 16:04:41,744 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.09 04:04:41" (1/1) ... [2019-09-11 16:04:41,747 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@311236cc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.09 04:04:41, skipping insertion in model container [2019-09-11 16:04:41,747 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.09 04:04:41" (1/1) ... [2019-09-11 16:04:41,755 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-11 16:04:41,770 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-11 16:04:41,935 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-11 16:04:41,941 INFO L188 MainTranslator]: Completed pre-run [2019-09-11 16:04:41,962 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-11 16:04:41,977 INFO L192 MainTranslator]: Completed translation [2019-09-11 16:04:41,977 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.09 04:04:41 WrapperNode [2019-09-11 16:04:41,977 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-11 16:04:41,978 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-11 16:04:41,978 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-11 16:04:41,979 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-11 16:04:42,082 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.09 04:04:41" (1/1) ... [2019-09-11 16:04:42,084 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.09 04:04:41" (1/1) ... [2019-09-11 16:04:42,091 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.09 04:04:41" (1/1) ... [2019-09-11 16:04:42,092 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.09 04:04:41" (1/1) ... [2019-09-11 16:04:42,100 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.09 04:04:41" (1/1) ... [2019-09-11 16:04:42,105 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.09 04:04:41" (1/1) ... [2019-09-11 16:04:42,109 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.09 04:04:41" (1/1) ... [2019-09-11 16:04:42,110 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-11 16:04:42,111 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-11 16:04:42,111 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-11 16:04:42,111 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-11 16:04:42,112 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.09 04:04:41" (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 [2019-09-11 16:04:42,161 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-11 16:04:42,162 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-11 16:04:42,162 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-11 16:04:42,162 INFO L138 BoogieDeclarations]: Found implementation of procedure y [2019-09-11 16:04:42,163 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-11 16:04:42,163 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-11 16:04:42,163 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-11 16:04:42,163 INFO L130 BoogieDeclarations]: Found specification of procedure y [2019-09-11 16:04:42,163 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-11 16:04:42,164 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-11 16:04:42,164 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-11 16:04:42,370 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-11 16:04:42,370 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-11 16:04:42,371 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.09 04:04:42 BoogieIcfgContainer [2019-09-11 16:04:42,371 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-11 16:04:42,372 INFO L113 PluginConnector]: ------------------------Abstract Interpretation---------------------------- [2019-09-11 16:04:42,372 INFO L271 PluginConnector]: Initializing Abstract Interpretation... [2019-09-11 16:04:42,372 INFO L275 PluginConnector]: Abstract Interpretation initialized [2019-09-11 16:04:42,373 INFO L185 PluginConnector]: Executing the observer AbstractInterpretationRcfgObserver from plugin Abstract Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.09 04:04:42" (1/1) ... [2019-09-11 16:04:42,398 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-11 16:04:42,491 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator COMPLT has no precise implementation. [2019-09-11 16:04:42,492 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator COMPGT has no precise implementation. [2019-09-11 16:04:42,670 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-11 16:04:42,694 INFO L272 AbstractInterpreter]: Visited 30 different actions 117 times. Merged at 5 different actions 25 times. Widened at 1 different actions 1 times. Performed 265 root evaluator evaluations with a maximum evaluation depth of 6. Performed 265 inverse root evaluator evaluations with a maximum inverse evaluation depth of 6. Found 1 fixpoints after 1 different actions. Largest state had 18 variables. [2019-09-11 16:04:42,695 INFO L132 PluginConnector]: ------------------------ END Abstract Interpretation---------------------------- [2019-09-11 16:04:42,698 INFO L168 Benchmark]: Toolchain (without parser) took 958.38 ms. Allocated memory was 142.6 MB in the beginning and 201.9 MB in the end (delta: 59.2 MB). Free memory was 90.2 MB in the beginning and 150.2 MB in the end (delta: -60.0 MB). There was no memory consumed. Max. memory is 7.1 GB. [2019-09-11 16:04:42,700 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 142.6 MB. Free memory was 108.9 MB in the beginning and 108.7 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-09-11 16:04:42,701 INFO L168 Benchmark]: CACSL2BoogieTranslator took 238.31 ms. Allocated memory is still 142.6 MB. Free memory was 89.8 MB in the beginning and 80.1 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. [2019-09-11 16:04:42,702 INFO L168 Benchmark]: Boogie Preprocessor took 132.26 ms. Allocated memory was 142.6 MB in the beginning and 201.9 MB in the end (delta: 59.2 MB). Free memory was 80.1 MB in the beginning and 178.9 MB in the end (delta: -98.8 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. [2019-09-11 16:04:42,703 INFO L168 Benchmark]: RCFGBuilder took 260.54 ms. Allocated memory is still 201.9 MB. Free memory was 178.9 MB in the beginning and 166.1 MB in the end (delta: 12.8 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. [2019-09-11 16:04:42,704 INFO L168 Benchmark]: Abstract Interpretation took 322.96 ms. Allocated memory is still 201.9 MB. Free memory was 166.1 MB in the beginning and 150.2 MB in the end (delta: 15.9 MB). Peak memory consumption was 15.9 MB. Max. memory is 7.1 GB. [2019-09-11 16:04:42,708 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 142.6 MB. Free memory was 108.9 MB in the beginning and 108.7 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 238.31 ms. Allocated memory is still 142.6 MB. Free memory was 89.8 MB in the beginning and 80.1 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 132.26 ms. Allocated memory was 142.6 MB in the beginning and 201.9 MB in the end (delta: 59.2 MB). Free memory was 80.1 MB in the beginning and 178.9 MB in the end (delta: -98.8 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 260.54 ms. Allocated memory is still 201.9 MB. Free memory was 178.9 MB in the beginning and 166.1 MB in the end (delta: 12.8 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. * Abstract Interpretation took 322.96 ms. Allocated memory is still 201.9 MB. Free memory was 166.1 MB in the beginning and 150.2 MB in the end (delta: 15.9 MB). Peak memory consumption was 15.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - UnprovableResult [Line: 6]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: abstract domain could reach this error location. Possible FailurePath: [L10] static NUM yn = 0; [L12] NUM ui = 0; [L22] NUM yi, yc; [L23] NUM K; [L24] NUM T; [L25] NUM taui; [L26] NUM taud; [L27] NUM ei, sumej, epi; [L28] int i; [L29] T = 1 [L30] taui = 1 [L31] taud = 1 [L32] K = .5 [L33] yc = .5 [L34] CALL, EXPR y(0) [L16] yn += ui [L17] return yn; [L34] RET, EXPR y(0) [L34] yi = y(0) [L35] epi = yc-yi [L36] sumej = epi [L37] i=0 [L37] COND TRUE i<120 [L38] CALL, EXPR y(i) [L16] yn += ui [L17] return yn; [L38] RET, EXPR y(i) [L38] yi = y(i) [L39] ei = yc-yi [L40] sumej = sumej+ei [L41] ui = K*(ei+sumej*T/taui+taud/T*(ei-epi)) [L42] epi = ei [L44] CALL __VERIFIER_assert(epi >= -1. && epi <= 1.) [L6] COND TRUE !(cond) [L6] __VERIFIER_error() RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...