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-lit/gr2006.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-efa34d5 [2019-09-16 17:27:52,097 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-16 17:27:52,099 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-16 17:27:52,111 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-09-16 17:27:52,112 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-09-16 17:27:52,113 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-09-16 17:27:52,114 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-09-16 17:27:52,116 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-09-16 17:27:52,118 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-09-16 17:27:52,119 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-09-16 17:27:52,120 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-09-16 17:27:52,121 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-09-16 17:27:52,122 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-16 17:27:52,123 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-16 17:27:52,124 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-16 17:27:52,125 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-16 17:27:52,126 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-16 17:27:52,127 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-16 17:27:52,128 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-16 17:27:52,130 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-16 17:27:52,132 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-16 17:27:52,133 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-16 17:27:52,134 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-16 17:27:52,135 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-16 17:27:52,137 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-09-16 17:27:52,138 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-09-16 17:27:52,138 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-09-16 17:27:52,139 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-09-16 17:27:52,139 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-09-16 17:27:52,141 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-09-16 17:27:52,141 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-09-16 17:27:52,142 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-09-16 17:27:52,143 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-09-16 17:27:52,143 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-09-16 17:27:52,144 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-09-16 17:27:52,145 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-09-16 17:27:52,145 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-09-16 17:27:52,145 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-09-16 17:27:52,146 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-16 17:27:52,147 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-16 17:27:52,147 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-16 17:27:52,148 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 [2019-09-16 17:27:52,163 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-16 17:27:52,164 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-16 17:27:52,164 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-16 17:27:52,164 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-16 17:27:52,165 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-16 17:27:52,165 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-16 17:27:52,165 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-16 17:27:52,166 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-16 17:27:52,166 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-16 17:27:52,166 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-16 17:27:52,167 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-16 17:27:52,167 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-16 17:27:52,167 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-16 17:27:52,167 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-16 17:27:52,168 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-16 17:27:52,168 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-16 17:27:52,168 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-16 17:27:52,168 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-16 17:27:52,168 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-16 17:27:52,169 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-16 17:27:52,169 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-16 17:27:52,169 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-16 17:27:52,169 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-16 17:27:52,169 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-16 17:27:52,170 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-16 17:27:52,170 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-16 17:27:52,170 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-16 17:27:52,170 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-16 17:27:52,171 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-16 17:27:52,171 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-16 17:27:52,200 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-16 17:27:52,212 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-16 17:27:52,216 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-16 17:27:52,218 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-16 17:27:52,218 INFO L275 PluginConnector]: CDTParser initialized [2019-09-16 17:27:52,219 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/gr2006.i [2019-09-16 17:27:52,304 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/75811db7a/8ea6b83f712b4b5598787ad2d2ae6315/FLAG1dbc0094a [2019-09-16 17:27:52,786 INFO L306 CDTParser]: Found 1 translation units. [2019-09-16 17:27:52,787 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/gr2006.i [2019-09-16 17:27:52,793 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/75811db7a/8ea6b83f712b4b5598787ad2d2ae6315/FLAG1dbc0094a [2019-09-16 17:27:53,151 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/75811db7a/8ea6b83f712b4b5598787ad2d2ae6315 [2019-09-16 17:27:53,161 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-16 17:27:53,163 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-16 17:27:53,164 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-16 17:27:53,164 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-16 17:27:53,167 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-16 17:27:53,168 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.09 05:27:53" (1/1) ... [2019-09-16 17:27:53,173 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1cc85910 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.09 05:27:53, skipping insertion in model container [2019-09-16 17:27:53,173 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.09 05:27:53" (1/1) ... [2019-09-16 17:27:53,180 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-16 17:27:53,196 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-16 17:27:53,385 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-16 17:27:53,390 INFO L188 MainTranslator]: Completed pre-run [2019-09-16 17:27:53,406 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-16 17:27:53,419 INFO L192 MainTranslator]: Completed translation [2019-09-16 17:27:53,419 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.09 05:27:53 WrapperNode [2019-09-16 17:27:53,419 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-16 17:27:53,420 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-16 17:27:53,420 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-16 17:27:53,420 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-16 17:27:53,518 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.09 05:27:53" (1/1) ... [2019-09-16 17:27:53,519 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.09 05:27:53" (1/1) ... [2019-09-16 17:27:53,524 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.09 05:27:53" (1/1) ... [2019-09-16 17:27:53,525 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.09 05:27:53" (1/1) ... [2019-09-16 17:27:53,529 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.09 05:27:53" (1/1) ... [2019-09-16 17:27:53,534 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.09 05:27:53" (1/1) ... [2019-09-16 17:27:53,535 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.09 05:27:53" (1/1) ... [2019-09-16 17:27:53,536 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-16 17:27:53,537 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-16 17:27:53,537 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-16 17:27:53,537 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-16 17:27:53,538 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.09 05:27:53" (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 [2019-09-16 17:27:53,604 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-16 17:27:53,605 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-16 17:27:53,605 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-16 17:27:53,605 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-16 17:27:53,605 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-16 17:27:53,605 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-09-16 17:27:53,605 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-16 17:27:53,606 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-09-16 17:27:53,606 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-16 17:27:53,606 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-16 17:27:53,606 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-16 17:27:53,765 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-16 17:27:53,766 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-16 17:27:53,767 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.09 05:27:53 BoogieIcfgContainer [2019-09-16 17:27:53,767 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-16 17:27:53,768 INFO L113 PluginConnector]: ------------------------Abstract Interpretation---------------------------- [2019-09-16 17:27:53,768 INFO L271 PluginConnector]: Initializing Abstract Interpretation... [2019-09-16 17:27:53,769 INFO L275 PluginConnector]: Abstract Interpretation initialized [2019-09-16 17:27:53,770 INFO L185 PluginConnector]: Executing the observer AbstractInterpretationRcfgObserver from plugin Abstract Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.09 05:27:53" (1/1) ... [2019-09-16 17:27:53,832 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-16 17:27:54,055 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-16 17:27:54,081 INFO L272 AbstractInterpreter]: Visited 24 different actions 110 times. Merged at 8 different actions 35 times. Widened at 1 different actions 5 times. Performed 229 root evaluator evaluations with a maximum evaluation depth of 6. Performed 229 inverse root evaluator evaluations with a maximum inverse evaluation depth of 6. Found 11 fixpoints after 4 different actions. Largest state had 6 variables. [2019-09-16 17:27:54,081 INFO L132 PluginConnector]: ------------------------ END Abstract Interpretation---------------------------- [2019-09-16 17:27:54,085 INFO L168 Benchmark]: Toolchain (without parser) took 920.21 ms. Allocated memory was 130.5 MB in the beginning and 198.2 MB in the end (delta: 67.6 MB). Free memory was 86.2 MB in the beginning and 152.9 MB in the end (delta: -66.6 MB). Peak memory consumption was 999.4 kB. Max. memory is 7.1 GB. [2019-09-16 17:27:54,086 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 130.5 MB. Free memory was 104.7 MB in the beginning and 104.4 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-09-16 17:27:54,087 INFO L168 Benchmark]: CACSL2BoogieTranslator took 256.13 ms. Allocated memory is still 130.5 MB. Free memory was 86.0 MB in the beginning and 76.8 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2019-09-16 17:27:54,088 INFO L168 Benchmark]: Boogie Preprocessor took 116.53 ms. Allocated memory was 130.5 MB in the beginning and 198.2 MB in the end (delta: 67.6 MB). Free memory was 76.8 MB in the beginning and 175.0 MB in the end (delta: -98.2 MB). Peak memory consumption was 16.2 MB. Max. memory is 7.1 GB. [2019-09-16 17:27:54,089 INFO L168 Benchmark]: RCFGBuilder took 230.88 ms. Allocated memory is still 198.2 MB. Free memory was 175.0 MB in the beginning and 163.3 MB in the end (delta: 11.7 MB). Peak memory consumption was 11.7 MB. Max. memory is 7.1 GB. [2019-09-16 17:27:54,090 INFO L168 Benchmark]: Abstract Interpretation took 312.86 ms. Allocated memory is still 198.2 MB. Free memory was 163.3 MB in the beginning and 152.9 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2019-09-16 17:27:54,095 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 130.5 MB. Free memory was 104.7 MB in the beginning and 104.4 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 256.13 ms. Allocated memory is still 130.5 MB. Free memory was 86.0 MB in the beginning and 76.8 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 116.53 ms. Allocated memory was 130.5 MB in the beginning and 198.2 MB in the end (delta: 67.6 MB). Free memory was 76.8 MB in the beginning and 175.0 MB in the end (delta: -98.2 MB). Peak memory consumption was 16.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 230.88 ms. Allocated memory is still 198.2 MB. Free memory was 175.0 MB in the beginning and 163.3 MB in the end (delta: 11.7 MB). Peak memory consumption was 11.7 MB. Max. memory is 7.1 GB. * Abstract Interpretation took 312.86 ms. Allocated memory is still 198.2 MB. Free memory was 163.3 MB in the beginning and 152.9 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - UnprovableResult [Line: 5]: 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: [L11] int x,y; [L12] x = 0 [L13] y = 0 [L14] COND TRUE 1 [L15] COND TRUE x < 50 [L16] y++ [L20] COND FALSE !(y < 0) [L21] x++ [L14] COND TRUE 1 [L15] COND TRUE x < 50 [L16] y++ [L20] COND FALSE !(y < 0) [L21] x++ [L14] COND TRUE 1 [L15] COND TRUE x < 50 [L16] y++ [L20] COND FALSE !(y < 0) [L21] x++ [L14] COND TRUE 1 [L15] COND TRUE x < 50 [L16] y++ [L20] COND FALSE !(y < 0) [L21] x++ [L14] COND TRUE 1 [L15] COND TRUE x < 50 [L16] y++ [L20] COND FALSE !(y < 0) [L21] x++ [L14] COND TRUE 1 [L15] COND FALSE !(x < 50) [L18] y-- [L20] COND TRUE y < 0 [L23] CALL __VERIFIER_assert(x == 100) [L4] COND TRUE !(cond) [L5] __VERIFIER_error() RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...