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/loops-crafted-1/Mono4_1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c6af20d [2019-09-03 21:27:16,784 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-03 21:27:16,787 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-03 21:27:16,799 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-09-03 21:27:16,799 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-09-03 21:27:16,800 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-09-03 21:27:16,802 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-09-03 21:27:16,804 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-09-03 21:27:16,805 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-09-03 21:27:16,806 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-09-03 21:27:16,807 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-09-03 21:27:16,808 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-09-03 21:27:16,809 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-03 21:27:16,810 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-03 21:27:16,811 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-03 21:27:16,812 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-03 21:27:16,813 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-03 21:27:16,814 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-03 21:27:16,816 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-03 21:27:16,818 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-03 21:27:16,820 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-03 21:27:16,821 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-03 21:27:16,822 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-03 21:27:16,823 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-03 21:27:16,826 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-09-03 21:27:16,826 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-09-03 21:27:16,827 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-09-03 21:27:16,828 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-09-03 21:27:16,828 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-09-03 21:27:16,829 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-09-03 21:27:16,830 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-09-03 21:27:16,830 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-09-03 21:27:16,831 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-09-03 21:27:16,832 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-09-03 21:27:16,833 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-09-03 21:27:16,834 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-09-03 21:27:16,834 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-09-03 21:27:16,835 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-09-03 21:27:16,835 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-03 21:27:16,836 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-03 21:27:16,837 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-03 21:27:16,838 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 21:27:16,854 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-03 21:27:16,854 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-03 21:27:16,854 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-03 21:27:16,854 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-03 21:27:16,855 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-03 21:27:16,855 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-03 21:27:16,856 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-03 21:27:16,856 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-03 21:27:16,856 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-03 21:27:16,856 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-03 21:27:16,857 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-03 21:27:16,857 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-03 21:27:16,857 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-03 21:27:16,858 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-03 21:27:16,858 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-03 21:27:16,858 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-03 21:27:16,858 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-03 21:27:16,859 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-03 21:27:16,859 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-03 21:27:16,859 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-03 21:27:16,859 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-03 21:27:16,859 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-03 21:27:16,860 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-03 21:27:16,860 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-03 21:27:16,860 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-03 21:27:16,860 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-03 21:27:16,860 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-03 21:27:16,861 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-03 21:27:16,861 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-03 21:27:16,861 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-03 21:27:16,890 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-03 21:27:16,909 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-03 21:27:16,915 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-03 21:27:16,917 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-03 21:27:16,917 INFO L275 PluginConnector]: CDTParser initialized [2019-09-03 21:27:16,918 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono4_1.c [2019-09-03 21:27:16,994 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f504045f2/0e8bd9e0e11d4106b8249c8b9ebee51c/FLAGb2a2c4e3f [2019-09-03 21:27:17,508 INFO L306 CDTParser]: Found 1 translation units. [2019-09-03 21:27:17,509 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono4_1.c [2019-09-03 21:27:17,517 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f504045f2/0e8bd9e0e11d4106b8249c8b9ebee51c/FLAGb2a2c4e3f [2019-09-03 21:27:17,858 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f504045f2/0e8bd9e0e11d4106b8249c8b9ebee51c [2019-09-03 21:27:17,872 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-03 21:27:17,876 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-03 21:27:17,878 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-03 21:27:17,878 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-03 21:27:17,882 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-03 21:27:17,883 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 09:27:17" (1/1) ... [2019-09-03 21:27:17,886 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@8e3ab4f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:27:17, skipping insertion in model container [2019-09-03 21:27:17,886 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 09:27:17" (1/1) ... [2019-09-03 21:27:17,894 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-03 21:27:17,911 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-03 21:27:18,090 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 21:27:18,095 INFO L188 MainTranslator]: Completed pre-run [2019-09-03 21:27:18,109 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 21:27:18,121 INFO L192 MainTranslator]: Completed translation [2019-09-03 21:27:18,122 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:27:18 WrapperNode [2019-09-03 21:27:18,122 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-03 21:27:18,122 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-03 21:27:18,123 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-03 21:27:18,123 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-03 21:27:18,226 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:27:18" (1/1) ... [2019-09-03 21:27:18,226 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:27:18" (1/1) ... [2019-09-03 21:27:18,232 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:27:18" (1/1) ... [2019-09-03 21:27:18,232 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:27:18" (1/1) ... [2019-09-03 21:27:18,235 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:27:18" (1/1) ... [2019-09-03 21:27:18,240 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:27:18" (1/1) ... [2019-09-03 21:27:18,241 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:27:18" (1/1) ... [2019-09-03 21:27:18,242 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-03 21:27:18,243 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-03 21:27:18,243 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-03 21:27:18,243 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-03 21:27:18,244 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:27:18" (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 21:27:18,291 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-03 21:27:18,294 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-03 21:27:18,294 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-03 21:27:18,295 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-03 21:27:18,295 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-03 21:27:18,295 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-03 21:27:18,295 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-03 21:27:18,295 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-03 21:27:18,295 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-03 21:27:18,448 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-03 21:27:18,449 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-03 21:27:18,450 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 09:27:18 BoogieIcfgContainer [2019-09-03 21:27:18,450 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-03 21:27:18,451 INFO L113 PluginConnector]: ------------------------Abstract Interpretation---------------------------- [2019-09-03 21:27:18,451 INFO L271 PluginConnector]: Initializing Abstract Interpretation... [2019-09-03 21:27:18,451 INFO L275 PluginConnector]: Abstract Interpretation initialized [2019-09-03 21:27:18,452 INFO L185 PluginConnector]: Executing the observer AbstractInterpretationRcfgObserver from plugin Abstract Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 09:27:18" (1/1) ... [2019-09-03 21:27:18,476 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-03 21:27:18,655 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-03 21:27:18,676 INFO L272 AbstractInterpreter]: Visited 22 different actions 68 times. Merged at 7 different actions 18 times. Widened at 2 different actions 3 times. Performed 104 root evaluator evaluations with a maximum evaluation depth of 7. Performed 104 inverse root evaluator evaluations with a maximum inverse evaluation depth of 7. Found 5 fixpoints after 3 different actions. Largest state had 3 variables. [2019-09-03 21:27:18,676 INFO L132 PluginConnector]: ------------------------ END Abstract Interpretation---------------------------- [2019-09-03 21:27:18,679 INFO L168 Benchmark]: Toolchain (without parser) took 803.06 ms. Allocated memory was 137.4 MB in the beginning and 198.2 MB in the end (delta: 60.8 MB). Free memory was 83.6 MB in the beginning and 155.0 MB in the end (delta: -71.4 MB). There was no memory consumed. Max. memory is 7.1 GB. [2019-09-03 21:27:18,681 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 137.4 MB. Free memory was 102.2 MB in the beginning and 102.0 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-09-03 21:27:18,682 INFO L168 Benchmark]: CACSL2BoogieTranslator took 243.92 ms. Allocated memory is still 137.4 MB. Free memory was 83.4 MB in the beginning and 74.2 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. [2019-09-03 21:27:18,683 INFO L168 Benchmark]: Boogie Preprocessor took 119.81 ms. Allocated memory was 137.4 MB in the beginning and 198.2 MB in the end (delta: 60.8 MB). Free memory was 74.2 MB in the beginning and 176.1 MB in the end (delta: -101.9 MB). Peak memory consumption was 11.2 MB. Max. memory is 7.1 GB. [2019-09-03 21:27:18,684 INFO L168 Benchmark]: RCFGBuilder took 207.59 ms. Allocated memory is still 198.2 MB. Free memory was 176.1 MB in the beginning and 165.7 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2019-09-03 21:27:18,685 INFO L168 Benchmark]: Abstract Interpretation took 225.73 ms. Allocated memory is still 198.2 MB. Free memory was 165.1 MB in the beginning and 155.0 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2019-09-03 21:27:18,689 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 137.4 MB. Free memory was 102.2 MB in the beginning and 102.0 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 243.92 ms. Allocated memory is still 137.4 MB. Free memory was 83.4 MB in the beginning and 74.2 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 119.81 ms. Allocated memory was 137.4 MB in the beginning and 198.2 MB in the end (delta: 60.8 MB). Free memory was 74.2 MB in the beginning and 176.1 MB in the end (delta: -101.9 MB). Peak memory consumption was 11.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 207.59 ms. Allocated memory is still 198.2 MB. Free memory was 176.1 MB in the beginning and 165.7 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * Abstract Interpretation took 225.73 ms. Allocated memory is still 198.2 MB. Free memory was 165.1 MB in the beginning and 155.0 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - UnprovableResult [Line: 2]: 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: [L5] int x = 0; [L6] int y = 500000; [L7] COND TRUE x < 1000000 [L8] COND TRUE x < 500000 [L9] x = x + 1 [L7] COND TRUE x < 1000000 [L8] COND TRUE x < 500000 [L9] x = x + 1 [L7] COND TRUE x < 1000000 [L8] COND TRUE x < 500000 [L9] x = x + 1 [L7] COND TRUE x < 1000000 [L8] COND TRUE x < 500000 [L9] x = x + 1 [L7] COND TRUE x < 1000000 [L8] COND TRUE x < 500000 [L9] x = x + 1 [L7] COND TRUE x < 1000000 [L8] COND FALSE !(x < 500000) [L11] x = x + 1 [L12] y = y + 1 [L7] COND FALSE !(x < 1000000) [L15] CALL __VERIFIER_assert(y!=x) [L2] COND TRUE !(cond) [L2] __VERIFIER_error() RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...